Volth ARGO HYTOS PRM2X8-06 User manual
Operating instructions_PRM2X8-06_15314_1en_08/2023
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ARGO-HYTOS s.r.o.
Dělnická 1306, CZ 543 01 VRCHLABÍ
The following is the authorised translation of original operating instruction PRM2X8-06 no_15314_1cz_06/2023
issued by the producer:
Important! Read the instructions before using the product.
Save the instructions for future reference.
If the operating instructions are lost, new ones can be found on the ARGO-HYTOS website www.argo-hytos.com
PROPORTIONAL PILOT OPERATED
HYDRAULIC DIRECTIONAL CONTROL VALVE
DESIGNED FOR USE IN POTENTIALLY EXPLOSIVE ATMOSPHERES
PRM2X8-06
OPERATING INSTRUCTIONS
EN
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PROHLÁŠENÍ O SHODĚ
ARGO
-HYTOS
o
I
Typ I Type I Typ Cís/o I No. I N Vydán I lssued I Ausgestellt
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UK DECLARATION OF CONFORMITY
ARGO
-HYTOS
Dělnická 1306, 543 15 Vrchlabí, Czech Republic
o co, s
�
°°° °
D
1
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Contents of operating instructions
Chapter Page
Declaration of conformity 2
Overview of signal words and warning signs used in the text 8
Overview of the symbols and signs used in the text 8
Glossary of technical terms used 8
1. Use of the product 8
2. Valve protection against intitiation of explosion in explosive atmospheres 9
2.1 Protection of electrical parts 9
2.2 Cable gland 9
2.3 Protection of non-electrical parts 10
2.4 Applicable legislation and standards 10
3. Risks and limitations of product use 10
3.1 Risks associated with operating in explosive atmospheres 10
3.2 Risks associated with the hydraulic part of the valve 11
3.3 Risks associated with the electrical part of the valve 11
4. Product description 11
4.1 Manual override 12
4.2 Materials used 12
4.3 Surface protection against corrosion 12
4.4 Basic technical parameters 12
4.5 Working fluid 13
4.6 Valve characteristics 13
4.7 Legislation and standards 13
5. Product modifications 14
6. Target group of users 14
7. Operating instructons broken down into product life stages 15
7.1 Transport and storage of the product 15
7.2 Installation of the product 15
7.2.1 Electrical connection of coils 15
7.2.2 Connecting the valve to the hydraulic circuit 17
7.3 Commissioning 18
7.4 Normal operation 18
7.5 Extraordinary and emergency situations 19
7.6 Repairs carried out by specialist 19
7.6.1 Replacing a defective valve 20
7.6.2 Replacing the sealing rings at the base of the valve body 20
7.7 Product maintenance 21
7.8 Spare parts supplied 21
7.9 Product disposal 21
8. Manufacturer contact 21
1. Based on legislative requirements, all operators in the logistics chain, from the manufacturer of the certified Ex solenoid coil to the end user
of the complete equipement, are obliged to make and maintain traceability records of Ex products, enabling, if necessary, the withdrawal
of products of certain serial numbers from the market due to defects of non-conformities, endangering safety of use in an explosive
atmosphere. In practice, this means keeping records of the assignment of Ex coil/valve identification numbers to the identification numbers
of the operators immediately down the logistics chain.
2. To meet the requirement for traceability of Ex products, it is necessary to keep product type labels legible throughout their technical life.
Mandatory traceability
Related documents:
Ex-coil EX18 user manual (Original document B18 of the coil manufacturer, SCHIENLE)
Product catalogue: Proportional directional control valve PRM2X8-06 (no. 5314)
Datasheet: General Technical Information GI (no. 0060)
Spare parts catalogue SP (no. 8010)
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An overview of signal words and warning signs used in the text
Glossary of technical terms used
›A hydraulic mechanism is one in which energy is transmitted via the pressure energy of the working fluid.
›A hydraulic directional control valve is a valve designed to control the direction of movement or stop the output component of an appliance.
›The pilot operated valve consists of two basic parts. The control stage is operated directly, e.g. by a solenoid. The main stage is hydraulically
controlled depending on the position of the control stage.
›The volumetric flow rate Q is the amount of liquid in volume units that flows through a given flow cross-section per time unit (SI unit is m3s-1,
in practice the unit l/min is used)
›The control solenoid is designed to reposition the valve spool that interconnects or closes the channels in the body. The solenoid consists of
an excitation coil which, by passing an electric current through the winding, generates a magnetic field which exerts a force on the armature of
the mechanical actuating system.
›The proportional hydraulic valve regulates the hydraulic parameter in the circuit continuously within a given range depending on the
magnitude of he input control electrical signal.
›Pressure is the force acting per area unit (SI unit Pascal (1 Pa = Nm-2), in practice the unit used is bar (1bar = 0,1MPa)
1. Use of product
The PRM2X8-06 hydraulic valve is an proportional directional control valve, pilot operated. The control spool, moving inside the main spool is
controlled directly by electromagnets. The main spool is hydraulically controlled depending on the position of the control spool. The advantage of the
two-stage valve design is the high hydraulic power transmitted (product of pressure and volume flow). The valve body has a connection pattern at
the base with a nominal size of DN 06 according to ISO 4401. The product is designed for continuous (proportional) flow volume control, the valve
with two solenoids is also for controlling the flow direction of the working fluid. In practice, the valve is used to continuously control the speed and
movement direction of the hydraulic cylinder piston rod or the speed and direction of rotation of the hydraulic motor output shaft, depending on the
magnitude and polarity of the electrical input control signal. For better control function of the valve, a suitable electronic control unit (not included)
should be used to control the valve. However, it must meet the necessary degree of protection or be located outside potentially explosive atmospheres.
Valves with ATEX certification according to Directive 2014/34/EU and IECEx certification according to IECEx OD 009 and related harmonized
standards may be used in explosive atmospheres consisting of mine gas, gas or dust. The valves are marked with the CE Ex mark of conformity and
are accompanied by a Declaration of Conformity.
Use in explosive atmospheres:
Equipment - group I, mines, where the explosive atmosphere of firedamp consists predominantly methane.
The valve has a high level of safety (EPL = Mb), which makes initiation unlikely during the interval between gas discharge and valve shutdown.
It is designed for category M2 devices that remain off after gas discharge.
Equipment - group II, where the explosive atmosphere consists of gasses other than mines gas.
The valve has a high level of safety (EPL = Gb) which allows the valve to be used in zones 1 and 2. The valve must not be used in zone 0.
There is a risk of explosion. The valve is certified for gas groups IIA (typical gas is propane), IIB (typical gas is ethylene) also for hydrogen from group IIC.
The joint dimensions do not meet the requirements for Group IIC acetylene.
Equipment - group III, where the explosive atmosphere consists of dust and flammable flying particles.
The valve has a high level of safety (EPL = Db) which allows the valve to be used in zones 21 and 22. The valve must not be used in zone 20. There is
a risk of explosion. The valve is certified for all dust groups - IIIA (flammable flying particles), IIIB (non-conductive dust) and IIIC (conductive dust).
An overview of other symbols and abbreviations used in the text
Symbol, designation Description of the meaning of the symbol, designation
AC, DC Designation for alternating (AC) and direct (DC) current, voltage
ATEX Explosive Atmospheres
EPL Equipment Protection Level (see EN 60079.0)
IEC International Electrotechnical Commission
NBR Rubber used for the manufacture of seals
PA Polyamide
PE Polyethylene
DANGER Signal word combined with a warning sign used to signify that a dangerous situation which could result in
death or serious injury is imminent.
WARNING Signal word combined with a warning sign used to signify the occurrence of a potentially dangerous situation
that could result in death or serious injury if not avoided.
CAUTION Signal word combined with a warning sign used to signify a potentially hazardous situation which, if not
avoided, may result in minor or moderate injury.
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2. Valve protection against initiation of explosion of explosive atmosphere
2.1 Protection of electrical parts
Area of application
The valves are only supplied with a coil nominal input power of 18 W for functional reasons.
The surface temperature of the coil meets the conditions of class T4 with a maximum surface temperature of 135 °C.
The use of the valve in the temperature class is subject to the maximum supply voltage of the coil not being exceeded, the working
fluid temperature and the ambient temperature not being exceeded (see Table 4.4 Basic technical parameters).
Temperature class
Equipment - group I – MINES Equipment - group II (IIG) - GAS Equipment - group III (IID) - DUST
Category M1– NO Zone 0 - NO Zone 20 - NO
Categorie M2
(the device remains switched off)
Zone 1
Zone 2
IIA (propane) Zone 21
Zone 22
IIIA (flammable particles)
IIB (ethylene) + H2 (hydrogen) IIIB (non-conductive dust)
IIIC (conductive dust)
The electrical part of the valve is an ATEX and IECEx certified solenoid coil.
The basic is the „d“ protection by flameproof enclosure (EN 60079-1, IEC 60079-1), which prevents the penetration of hot gases into the surroun-
ding explosive atmosphere in the event that an explosion is initiated inside the flameproof enclosure. For explosive atmospheres consisting of dust,
the enclosure „t“ (EN 60079-31, IEC 60079-31) is used. In addition, the coil is sealed with a potting compound.
Certification across standards NEC 500 and NEC 505, 506
NEC 500 (USA), Annex J (Kanada) NEC 505, 506 (USA) CEC Section 18 (Kanada)
Class I Division 1 Group B, C, D T4 Cl 1 Zone 1, AEx db IIB+H2 T4 Ex db IIB+H2 T4 Gb
Class II/III Division 1 Group E, F, G T4 Zone 21, AEx tb IIIC T135°C Db Ex tb IIIC T135°C Db
I M2 Ex db I Mb
II 2G Ex db IIB + H2 T4 Gb
II 2D Ex tb IIIC T135°C Db
Group Description Corresponds to EPL
Group B A typical gas is hydrogen Gb
Group C The typical gas is ethylene Gb
Group D Typical gases are methane and propane Gb
Group E Conductive dust Db
Group F Coal dust Db
Group G Non-conductive dust, grain dust Db
Class III Flammable airborne particles, paper or cotton processing Db
Certification ATEX, IECEx and UKCA
Use of the valve in potentially explosive atmospheres
Certification Number Issued Certification body
EU-Type Examination Certificate FM23ATEX0008X 13.6.2023 FM Approvals Europe Ltd. (Notified body No. 6024)
One Georges Quay Plaza, Dublin, Ireland D02 E440
IECEx Certificate of Conformity IECEx FMG 23.0003X 12.6.2023 FM Approvals LLC
1151 Boston-Providence Turnpike, Norwood, MA 02062, USA
UK-Type Examination Certificate FM23UKEX0010X 16.6.2023 FM Approvals Ltd. (Approved body No. 1725)
Voyager Place, Maidenhead, Berkshire, SL6 2PJ, UK
Certificate Number Issued Certification company
Certificate of Conformity FM23US0009X 12.6.2023 FM Approvals LLC
1151 Boston-Providence Turnpike, Norwood, MA 02062, USA
Certificate of Conformity FM23CA0005X 12.6.2023 FM Approvals LLC
1151 Boston-Providence Turnpike, Norwood, MA 02062, USA
2.2 Cable gland
The cable gland is a separately certified ex-component. A gland with certified type protection „d“ must be used to prevent hot gases from escaping
and initiating an explosion in the surrounding environment in the event of an explosion in the interior of the coil casing. (The gland is not included
with the valve.)
I M2 Ex db I Mb
II 2G Ex db IIC Gb
II 2D Ex tb IIIC Db
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Non-electrical parts of valve
I M2 Ex h I Mb
II 2G Ex h IIC T4 Gb
II 2D Ex h IIIC T135°C
2.3 Protection of non-electrical parts
The non-electrical part of the valve consists of the hydraulic part and the solenoid actuating system.
The safety of the non-electrical parts has been ensured and assessed according to EN ISO 80079-36, EN ISO 80079-37 a EN ISO/IEC 80079-38.
› The moving parts, the spool/poppet, armature and pin of the actuating system, perform a sliding motion in a space separated by a seal from
the surrounding environment and flooded with working fluid.
› Not exceeding the maximum surface temperature of the given temperature class is conditioned by not exceeding the maximum temperature
of the working fluid (70 °C), the maximum ambient temperature (see table 4.4 Basic technical parameters) and the nominal voltage of the coil.
› The valve body and coil body are of robust construction, sufficiently resistant to destruction by mechanical shock.
(Valve body impact resistance test performed according to EN IEC 60079-0 paragraph 26.4.2: two impacts with a weight with a hardened head of
diameter D25 mm, weighing m = 1 kg, falling from a height of 0.7 m, with a total potential energy of 7 J)
› The hydraulic section has sufficient compressive strength, tested at 1.5 times the maximum operating pressure of the fluid.
› The surface of the valve is grounded using a grounding screw and protected against static electricity discharge.
› The construction materials used meet the requirements for limited content of certain elements to prevent the formation of electrical cells and
excessive corrosion.
› The surface materials used do not create sparks during mechanical impacts.
› The sliding rod of the manual override N7 is protected by a sealing sleeve against the ingress of contaminating particles, especially hard particles,
which could create an initiating spark.
2.4 Applicable legislation and standards
The valve complies with the relevant requirements of legislation and standards:
Directive 2014/34/EU (harmonized NV 116/2016) Equipment for potentially explosive atmospheres (ATEX)
IECEx OD 009 Operational Document
Standards used to assess the conformity of the electrical part:
CENELEC EN IEC 60079-0
Explosive atmospheres – Part 0: Equipment – General requirements
EN 60079-1, IEC 60079-1
Explosive atmospheres – Part 1: Equipment protection by flameproof enclosure „d
EN 60079-31, IEC 60079-31
Explosive atmospheres – Part 31: Equipment dust ignition protection by enclosure „t“
Standards used to assess the conformity of the non-electrical part:
EN ISO 1127-1
Explosive atmospheres – Explosion prevention and protection – Part 1: Basic concepts and methodology
EN ISO 80079-36
Explosive atmospheres – Part 36: Non-electrical equipment for explosive atmospheres – Basic method and requirement
EN ISO 80079-37
Explosive atmospheres – Part 37: Non-electrical equipment for explosive atmospheres – Non-electrical type of protection constructional safety „c“,
control of ignition sources „b“. liquid immersion „k“
EN ISO/IEC 80079-38
Explosive atmospheres – Part 38: Equipment and components in explosive atmospheres in underground mines
3. Risks and limitations of product use
DANGER
Explosive atmosphere type and zone
The valve must not be used outside the specified range (see paragraph 1Product use ), in particular it is not
intended for equipment category M1group l (mines) zone 0 group II (gases) and zone 20 group III (dust).
Risk of explosion.
DANGER
Surface temperature
When selecting the valve, the surface temperature requirement of the valve must be taken into account.
It must be min. 25 °C lower than the temperature necessary to initiate an explosion of an explosive
atmosphere of a given composition. If the initiation temperature is exceeded an explosion will occur.
DANGER
Handling in an explosive atmosphere
It is forbidden to install, disassemble, repair or replace the valve in an exlosive atmosphere.
Risk of explosion.
3.1 Risks associated with operating in explosive atmospheres
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DANGER
Maximum operating pressure
The valve may be used for a maximum pressure of 350 bar in the ports P, A, B and 210 bar in port T.
If the maximum pressure is exceeded there is a risk of damage to the valve.
Exceeding the pressure value may cause the valve to rupture
I.e. exceeding 525 bar in ports P, A, B and 315 bar in port T.
DANGER
Maximum hydraulic output
Section 4.6 of the product catalogue shows the operating limit curves for each type of spool valve. The
hydraulic performance is provided as the product of the working pressure and the flow rate. If the instant
power exceeds the curve limit, the valve may lose function. The spool is subjected to excessive hydrodynamic
forces, the valve spool will not be switched over and control of the appliance will be lost.
WARNING
Valve installation
The valve may only be mounted to a sufficiently machined surface with a specified connection pattern. The
specified sealing rings must be inserted, undamaged into the body recesses. The valve is fastened with four
M5x30 DIN 912 10.9 bolts tightened to a tightening torque of 8.9 + 1 Nm. Otherwise, there is a risk of leakage
of the working fluid and loosening of the valve by pressure (For details, see paragraph 7.2 Product installation)
CAUTION
Maximum operating temperature
The maximum operating temperature must not exceed the temperature range allowed in paragraph 4.4 Basic
technical parameters or in the product catalogue. Both the temperature of the operating fluid and the ambient
temperature significantly influence:
a) the surface temperature of the valve
b) the temperature of the solenoid coil winding - there is a risk of a reduction in hydraulic performance
c) the seal material - risk of seal damage and leakage of the working fluid.
CAUTION
Surface temperature of the valve
The surface temperature of the valve can exceed 100 °C due to the temperature of the working fluid and pressure
loss in the valve being converted to heat. Do not touch the surface of the valve when the circuit is operational,
even after switching off. Wait until it has cooled down to a safe temperature. There is a risk of burns.
CAUTION
Working fluids used
Valves may only be used for normal working fluids, especially hydraulic oils (see chapter 4. Product description).
It is forbidden to use the following as working fluids, in particular:
› water and aquesous solutions that will cause corrosion and loss of valve function
› liquids which are flammable or explosive, the heating of which may cause fire or explosion when
passing through the valve
› aggresive liquids (e.g. acids and hydroxides) which will cause damage to the valve and loss of
function.
The flash point of the used working fluid must be at least 50 K higher than the maximum allowed of surface
temperature of the valve in the given temperature class.
3.2 Risk associated with the hydraulic part of the valve
DANGER
Electrical shock
The solenoid coil is an electrical device that should be connected by a person with appropriate electrical
qualifications. Before connecting the solenoid, check the parameters of the power supply, the integrity of the
cable and the solenoid. There is a risk of electric shock.
CAUTION
Electrical supply values
The solenoid coil is energised by the electrical current passing through the winding. The values of the electrical
supply must not exceed the values indicated on the coil. There is a risk of losing solenoid function.
3.3 Risks associated with the electrical part of the valve
4. Product description
The hydraulic part of the valve consists of a cast iron body (1) with channel outlets on the lower base, a hardened spool assembly with a control spool
inside. The control spool, which is held in its base position by a pair of centering springs, is adjustable from its working position by means of
explosion-proof certified solenoids (2). The solenoid coils are fixed to the actuating system with hexagonal nut (3). Thread adapter (4) with an
optional thread is used for connecting the power cable, e.g. using a suitable cable gland.
2
3
4
2
3
4
1
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134 (5.28)
76 (2.99)
30 (1.18)
The manual override spool position control, built into the rear of the solenoid control system, is used to reposition the spool in the event of loss of
solenoid function or loss of electrical supply to the solenoid coils to achieve the safe position of the actuated mechanism.
The use of manual override is limited by the maximum T port pressure of 25 bar.is limited by the maximum T port pressure of 25 bar.
Without designation - standard N7 - with detent assembly
4.1 Manual override
Dimensions in mm (in)
CAUTION
Use of the manual override is forbidden when the valve solenoids are operational.
If the valve is operated by solenoids do not use the manual override control of the valve spool.
Valve damage and loss of function may result.
4.2 Materials used
Valve body – grey cast iron
Spool – hardened steel
Compression spring – patented steel wire for the production of springs
Valve seal – NBR
Pole piece, tube and armature of actuating system, coil body and steel plug, coil hexagonal nut - low carbon steel
Non-magnetic ring and pin of actuating system – Cr-Ni stainless steel
End plug of actuating system – brass
Coil body – stainless steel
Coil winding – enamelled Cu wire
Coil seal on actuating system – silicone
Shipping plate – PE
The materials used are not found in the lists of prohibited and mandatory documented substances
Directive 2015/863/EU (RoHS) and EU Regulation no. 1907/2006 (REACH).
4.3 Surface protection against corrosion
4.4 Basic technical parameters
The valve surface is zinc-coated with 520 h corrosion protection in NSS according to ISO 9227. Surface layer without hexavalent chronium Cr+6.
Parameter Unit Value
Nominal valve size DN 06
Maximum pressure in ports P, A, B bar (PSI) 350 (5080)
Maximum pressure in port T bar (PSI) 210 (3050)
Maximum flow volume through the valve at p = 320 bar l/min (GPM) 140 (37)
Nominal flow rate at ∆p = 10 bar l/min (GPM) 25 (6.6)
Working fluid temperature for NBR seal material °C (°F) -30 … +70 (-22 ... 158)
Hysteresis % < 6
Working fluid kinematic viscosity range mm2s-1 10 až 400
Required minimum working fluid purity class 19/16/13 ISO 4406
Lifetime cycles 107
Weight of valve with two solenoids kg 4.06 (8.91)
Technical data of the solenoid with certification for explosive environments
Nominal supply voltage (UN) V DC 12 24
Rated voltage fluctuation ±10 % UN
Limit current A 1.32 0.64
Rated resistance at 20 °C (68 °F) Ω 7.6 31.2
Nominal coil input power W 18
Optimal PWM frequency Hz 80 ...1000
Electrical protection IP according to EN 60529 IP66 / IP68*
Ambient temperature range for each surface temperature class T4
Temperature class Nominal coil input power °C (°F) Ambient temperature range
T4 – 135 °C 18 W -30 … +60 (-22 ... 140)
*IP68 – test conditions: product submerged 1m under water for 24 hours.
The indicated IP protection level is only achieved if the cable is properly mounted.
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The valve is designed for common hydraulic working fluids:
mineral oils of performance classes HM and HV according to ISO 6734-4
non-flammable and difficult to ignite hydraulic fluids according to ISO 12922
environmentally acceptable hydraulic fluids according to ISO 15380
NOTICE: NBR seal material is not suitable for some working fluid groups, such as the HFD group.
In case of uncertainty, we recommend to perform a test of the mutual tolerance of the seal material and the working fluid.
4.5 Working fluid
Characteristics measured at a kinematic viscosity of the liquid ν= 32 mm2/s (156 SUS)
4.6 Valve characteristics
Operating limits:
∆p = 10 bar (145 PSI)
Flow dir P →A / B →Tor P →B / A →T
Volumetric flow rate Q [l/min (GPM)]
-32
-1370
-24
-16
0
8
16
24
32
-8
0-800 -400 400 800 1370
-650 0-400 -200 200 400 650
(8.5)
(6.3)
(4.2)
(2.1)
(-2.1)
(-4.2)
(-6.3)
(-8.5)
Supply voltageí
Current control signal Ic [mA]
12 V
24 V
-160
-120
-80
0
40
80
120
160
-40
-600 0-400 -200 200 400 600
(42.3)
(31.7)
(21.1)
(10.6)
(-10.6)
(-21.1)
(-31.7)
(-42.3)
0
12
34
5
54
32
1
Operating limits:
Current control signal Ic [mA]
Volumetric flow rate Q [l/min (GPM)]
pin
[bar (PSI)]
1 2 3 4 5
50 (725) 100 (1450) 150 (2180) 200 (2900) 320 (4640)
4.7 Legislation and standards
ČSN EN ISO 4413 Hydraulics - General rules and safety requirements for hydraulic systems and their components
ČSN ISO 6403 Hydrostatic drives. Valves for flow and pressure control. Test methods
ČSN ISO 4411 Measurement of the characteristics Δp = function (Q) of hydraulic valves
ČSN EN ISO 9001 Quality management systems
ČSN EN ISO 12100 Machine safety / risk analysis
Directive 2006/42/EU on machinery / used chapters: 1.7.4 Instructions for use, Annex III CE marking
ČSN EN 82079-1 Preparation of instruction manuals - Structure, content and presentation / Part 1: General principles and detailed requirements
20
40
80
100
120
140
160
60
80 200120 160 240 280
320
(42.3)
(37.0)
(31.7)
(26.4)
(15.9)
(10.6)
(5.3)
3, 4
2
1
400
(21.1)
(1160) (2320) (3480) (4640)
Operating limits
Ic
[%]
1234
40 60 80 100
Volumetric flow rate Q [l/min (GPM)]
Input pressure p0[bar (PSI)]
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5. Product modification
An overview of possible valve modifications is described in the ordering key.
The spool connection, flow rate and the electrical parameters of the coil cannot be subsequently changed by the user.
Ordering key
12
24
PRM2X8-06 / 25 - B4 - 1 B
3Z11
3Y11
M
NPT
Certifications of valve
ATEX, IECEx,
UKCA, FM APPROVED
No designation
Surface treatment
520 h salt spray test (ISO 9227)
Seals
NBR
No designation
Clamping lenght for mounting screw
22 mm (0.86 in)
No designation
N7
Manual override
standard
detent assembly
Valve size
Explosion proof
Proportional directional
control valve, pilot operated
Nominal flow rate at ∆p = 10 bar (145 PSI)
25 l/min (6.6 GPM)
Supply voltage / limit current (IG)
12 V DC / 1.32 A
24 V DC / 0.64 A
Spool symbols
Temperature class - solenoid nominal input power
Class T4 - 18 W
- For proportional valves with two solenoids, one solenoid must be de-energized before the other solenoid can be charged.
- Mounting bolts M5x30 DIN 912-10.9 or studs must be ordered separately. Tightening torque is 8.9 Nm (6.6 Ibf.ft).
Threaded adapter with thread
M20x1.5
½ NPT ANSI
6. Target user group
All of the above activities related to this valve, in particular installation and connection to the hydraulic circuit, require specialist technical knowledge
and experience in the field of hydraulics. The minimum level of competence required is CETOP level 2. This level is generally defined as performing a
variety of activities that require an understanding of technical factors and contexts. This may lead to the need for correct interpretation (e.g.
tolerances, operating methods) or the application of various non-repetitive procedures. This may require the performance of checks, simple analysis
and diagnostics, and the ability to react to changes in an operational manner. Teamwork is often necessary.
The connection of solenoid coils to the supply voltage must only be carried out by persons with the appropriate electrical qualifications.
All operations must be carried out with responsibility for correctness and quality, as this is a dangerous area of product use.
It is forbidden for the following persons to carry out any activities related to this product:
› minors (the exception is practical training of pupils under the professional supervision of a teacher)
› without established professional competence
› under the influence of alcohol and/or drugs
› patients whose medical condition could affect safety (reduced attention and ability to react in time, excessive fatigue)
› under the influence of drugs that have a demonstrable effect on attention and timeliness
› allergic to hydraulic working fluids
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WARNING
Slippery valve surface
The valve contains a small amount of residual oil after a hydraulic function test carried out by the manufacturer.
If the surface of the unpacked valve is contaminated with oil, remove the oil using a cleaning cloth. A slippery
valve surface can cause the valve to fall during handling and cause minor injury or damage to the valve.
7. Operating instructions broken down by product life stage
The valve is packaged in vacuum shrink-wrapped PE foil and protected against moisture and dust as standard. The P, A, B, T ports on the base are
additionally protected by a plastic (PE) shipping plate. An identification label is affixed to the packaging.
The products should only be stored for the necessary time at a temperature of 0 to +30 °C in a dry place with a relative humidity of up to 65 %.
After extended periods of storage, we recommend checking the product for corrosion damage, replacing seal at the base of the body and flushing
the product with clean oil before connecting it to the hydraulic circuit.
7.1 Transportation and storage of the product
Check that the valve type on the identification plate is correct. Cut the packaging with scissors and carefully remove the valve from the packaging.
Unpack the valve in a clean place and prevent contamination of the valve. The packaging is made of PE and can be easily contaminated with residual
hydraulic oil from the valve. Dispose of the packaging in accordance with applicable environmental regulations.
The mounting position of the valve is arbitrary. However, if vibrations or shocks are applied to the valve during operation, they must not be applied in
the direction of the spool axis.
7.2 Product installation
7.2.1 Electrical connection of coils
When connecting the coil power cable, proceed as follows:
› Use a “d” certified cable to connect the coils to the power supply. When selecting the cable structure and outer diameter, follow the
manufacturer’s recommendations for the certified cable gland used. (The cable gland is not included with the valve.)
› Use a cable and cable gland with sufficient insulation temperature rating. For an 18 W coil, the insulation temperature class must
be 55 °C higher than the maximum permissible ambient temperature for temperature class T4.
› The cable should be sufficiently protected against damage with respect to environmental conditions, e.g. resistant to mechanical damage or
chemical attack.
› The design of the coil casing allows the connection of the power cable from the vertical or horizontal direction depending on which hole in the casing
the threaded reducer with external thread M36x1 is screwed into.
› Thread adapter with M20x1.5 female thread or with ½ NPT ANSI tapered female thread can be selected.
› The second hole in the casing is closed with a plug after the wires are mounted to the coil terminal.
› The thread adapter and plug are sealed in the casing with a VQM silicone rubber O-ring.
› The thread adapter and closing plug are protected against loosening after assembly by screwing in the M3x4 grub screws in the radial direction.
WARNING
Sealing ring
During assembly, the ring must not be damaged or the part must not be mounted without the sealing ring.
There is a risk of explosion.
1. Stopping plug
with M36x1 thread and sealing ring
2. Thread adapter
with thread M36x1 and sealing ring
- A. Internal thread M20x1.5
- B. ANSI ½ NPT tapered female thread
3. Grub screws
M3x4
Nominal input power 18 W
Temperature class Max. ambient temperature Min. temperature insulation class
T4 60 °C 115 °C
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› The user must protect the electrical circuit of the solenoid with a fuse with a tripping characteristic corresponding to the slow fuse wire
blowing. The fuse tripping current shall be IN≤ 3x IG, where IGis the current flowing through the solenoid coil at the maximum coil
temperature. (For IGvalues, see the coil electrical parameter table.) Conductors and elements shall be used for the fuse circuit that are
rated for a higher electric current than the maximum short-circuit current in the customer‘s equipment circuit.
› If elements of the electrical installation, including the fuse, are also located in a potentially explosive atmosphere, these elements must also have
the appropriate degree of protection.
Electrical wiring diagram of coils Coils with DC power supply and surge protection by bipolar diode
UZ= 36 V for UN= 12 V DC and 24 V DC
12
Ground wire
Coil power supply
When connecting the coil power cable, proceed as follows:
› Using the inbus wrench A/F 10, loosen and unscrew the steel plug on the top surface of the coil housing to gain access to the terminal block inside
the housing. Do not damage the plug seal.
› Disassemble the cable gland into its individual parts. Strip the end of the cable and thread the cable successively through all parts of the gland, the
thread adapter and the horizontal or vertical hole in the coil casing (depending on the direction of cable feed).
› Strip the ends of the wires and plug them into the terminal block (see picture below).
› Screw the thread adapter into the coil casing and tighten it to a torque of 30±5 Nm using a wrench A/F 27.
› Screw the part of the cable gland to be screwed into the thread adapter and tighten to the torque specified by the manufacturer.
› Assemble the cable gland according to the manufacturer’s instructions so that the cable is sufficiently secured against pulling out by external force
and displacement by gases in the event of an explosion in the inner space of the coil casing. The inner space of the coil casing must be sufficiently
sealed.
› Fit a steel plug with seal into the free hole in the coil casing and tighten it to the specified torque of 30±5 Nm using an inbus wrench A/F 10.
Secure the position of the thread adapter and the steel plug against loosening with M3x4 grub screws and tighten them to a torque of 0.4±0.1
Nm using an inbus wrench A/F 1.5 mm.
› After mounting the valve, the surface of the coil must be grounded by connecting the ground wire to the terminal on the top surface of the coil
casing using an M5x10 screw. Tighten the screw to a tightening torque of 2.2±0.2 Nm using an 8 mm wide screwdriver.
Connecting the wires to the terminal block:
› Remove the insulation from the end of the cable so that when the cable is fixed in the cable gland, the insulated part of the cable sufficiently
extends into the inner space of the terminal block.
› Strip the ends of the wires to a length of 5 to 6 mm.
Release the clamp by pressing the lever against the spring in the direction of the arrow and insert a wire with a cross section of 0.5 to 1.5 mm2.
Releasing the lever secures the wire. The right clamp is for the earth wire.
› Make sure that the conductors are sufficiently secured in the clamps and are not in danger of loosening.
Power fuse protection
DANGER
Correct electrical connection of coils
Pay attention to the correct fixing of the wires in the terminal box, the correct fixing and sealing
of the thread adapter, the steel stopping plug and the cable in the cable gland. There is a risk of explosion.
DANGER
Coil surface grounding
If the surface of the coil and thus the entire valve is not grounded, an electrical discharge of static electricity
may occur.
Operating instructions_PRM2X8-06_15314_1en_08/2023
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A-A
4x 9,5 (0.4)
4x 5,3 (0.2)
49,3 (1.94)
68 (2.68)
(216 (8.5))
74 (2.91)
(97 (3.82))
93 (3.66)
32
(150 (5.91))
8 (0.31) 46 (1.81)
67,5 (2.66)
24 (0.94)
12,5 (0.49)
7,23 (0.28)
A
T1
B1
A1
P1
M36x1
25 (0.98)
15,5 (0.61)
M20x1,5
1/2-14 NPT
27
10
Table of coil electrical parameters
7.2.2 Connecting the valve to the hydraulic circuit
The valve is designed for plate mounting with connection pattern ISO 4401-03-02-0-05 for size DN 06.
The connection plate must have a sufficiently machined surface to ensure a leak tightness in the dividing plane between the plate and the valve body
Dimensions of the PRM2X8-06 proportional directional control valve, dimensions in mm (in)
Coil type with DC
electric power supply
Nominal supply
voltage
Winding resistance
at t = 20 °C
Nominal current Limit current Bipolar diode Input power
UN[V DC] R20 [Ω] IN[A] IG[A] UZ[V] PN[W]
EX18-002-D-1-A-012-0 IDXa 12 7.6 1.58 1.32 36 18.8
EX18-002-D-1-A-024-0 IDXi 24 31.2 0.77 0.64 36 17.8
Mounting screw by 8,9+1 Nm (6.6+0.7 lbf.ft)
M5x30 DIN 912-10,9 4
TP
B
A
G
0,75 (0.03)
4xM5-6Hx13
15,5 (0.61)
31,75 (1.25)
5,1 (0.20)
25,9 (1.16)
31 (1.22)
12,7 (0.50)
21,5 (0.85)
30,2 (1.18)
40,5 (1.59)
ISO 4401-03-02-0-05
Ports P, A, B, T - max. ∅7.5 mm (0.29 in)
Remove the shipping plate from the valve body. Before assembly, check the connection
surfaces for damage and cleanliness, and check the sealing rings on the valve body base for
damage.
Carefully place the valve on the connection pattern of the plate. Ensure the correct orientation
of the channels.
Fix the valve with four M5x30 DIN 912 10.9 strength screws and tighten them evenly with an
inbus wrench A/F 4 to a torque of 8.9+1 Nm (6.6+0.7 Ibf.ft).
(The screws are not included with the valve, they must be ordered separately)
Coil description note: Nominal input power of coil EX18-002 is 18 W.
30±5 Nm
(22.1±3.7 lbf.ft)
Stopping plug interchangeable
with the thread adapter
5±1 Nm
(3.7±0.7 lbf.ft)
30±5 Nm
(22.1±3.7 lbf.ft)
Thread adapter is not mounted
Grounding screw
M5x10
2.2±0.2 Nm
(1.6±0.2 lbf.ft)
Operating instructions_PRM2X8-06_15314_1en_08/2023
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WARNING
Correct installation of the valve
The four sealing rings on the base of the body must be undamaged and inserted into the recesses, the
connection surface of the plate sufficiently machined and undamaged, the valve must be fixed with four
fastening bolts tightened to the specified torque. Failure to meet these conditions for proper valve installation
may result in leakage of working fluid.
The solenoid windings heat up during operation. Effective external cooling must be provided to ensure that the maximum winding temperature is not
exceeded, by not exceeding the maximum fluid and ambient temperature and by maintaining minimum volume of the connection block. A valve
body volume of (152.5 cm3) is sufficient for one manifold. If several valves that can be switched simultaneously are connected on the connection
plate, a distance of at least 10 mm must be maintained between the bodies of adjacent valves (see fig.).
TP
B
A
TP
B
A
TP
B
A
85 (3.35)
55 (2.17)
110 (4.33)
60 (2.36)
WARNING
Switching solenoids
Directional control valves with two solenoids, coils must not be switched at the same time.
There is a risk of damaging the valves.
WARNING
Coil cooling
Coil cooling takes into account the cooling surface of the hydraulic part of the valve.
Do not power separately disassembled coils. Excessive winding heat, insulation damage and short circuiting
between coils may occur. For the same reason, the surface of the coils must not be covered, exposed to direct
heat sources or sunlight. The valve must not be closed in a tight space without ensuring air circulation.
7.3 Commissioning
Before commissioning the hydraulic ciruit, check that the valve is correctly mounted on the connection plate and that electrical supply cables are
correctly connected. The valve is not to be adjusted. Test operation should be conducted without the pressence of an explosive atmosphere.
After the hydraulic circuit has been commissioned, check the valve for leaks. Simply verify the directional control valve function, repositioning the
spool by alternately switching the solenoids and monitoring the movement of the appliance or the amount of pressure in the appliance branches
(ports A and B)
7.4 Normal operation
During normal operation, the valve spool is adjusted by the solenoids. Normal operation of the system does not require any manipulation of the valve.
DO NOT EXCEED THE MAXIMUM PARAMETERS, shown in table 4.4.
OBSERVE THE OPERATIONAL RESTRICTIONS AND AVOID THE RISKS, referred to in paragraph 3.
USE PROTECTIVE EQUIPMENT
When working with hydraulic fluid, it is recommended to wear safety goggles, protective rubber gloves and sturdy shoes with non-slip soles.
Operating instructions_PRM2X8-06_15314_1en_08/2023
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7.5 Extraordinary and emergency situations
In the event of a power failure to the solenoids or a coil failure, the centering spring will return the valve spool to its base position.
Based on the results of the risk analysis, the following potential faults have been identified:
› External valve leakage due to seal damage associated with a working fluid leak.
› Loss of valve function, resulting in loss of control of the appliance.
› Mechanical damage to the electrical part of the valve, including the cable.
DANGER
Shutdown of electrical power, pressure source and circuit relief
In the event of an emergency, immediately shut off the electrical power supply to the control solenoids and
the pressure source (pump). Relieve all parts of the hydraulic circuit including the hydraulic accumulators by
connecting them to the tank. A malfunctioning valve may cause a dangerous operating situation due to loss
of control. A damaged electrical part can initiate an explosion.
DANGER
Prohibition of handling and repair in explosive atmospheres
A defective valve must not be repaired or dismantled when an explosive atmosphere is present.
There is a risk of initiating an explosion.
WARNING
Check pressure relief part of the circuit
Always ensure that the circuit is depressurised before intervening in the hydraulic circuit, for example before
removing a valve. Otherwise there is a risk of leakage of working fluid and contamination of persons.
WARNINGÍ
Surface temperature
Before starting disassembly, make sure that the surface of the valve and solenoid coils has cooled to a low
enough temperature to prevent skin burns.
Defective valves must be replaced/repaired.
ENVIRONMENTAL PROTECTION
Spilled working fluid must be removed immediately, e.g. with suitable absorbents, contaminated parts of the perimeter cleaned,
contaminated objects in the vicinity cleaned or disposed of.
Contaminated objects and residues of leaked working fluid must be disposed of in accordance with the applicable environmental
regulations.
FIRST AID
Electric shock
• Switch off the power supply immediately
• Make sure the casualty is breathing.
• Call emergency medical services
• If the casualty is not breathing, initiate measures to restore basic life functions according to first aid abilities (CPR, artificial
respiration) and equip the workplace (defibrillator) with life-saving equipment.
Contamination by hydraulic working fluid
If contamination of persons occurs, contaminated parts of clothing must be removed immediately and the skin thoroughly washed
with soap or treated with a suitable cream.
If the eyes are contaminated, flush them with clean water and seek medical attention. Seek medical attention also in case of
accidental ingestion of working fluid or skin allergic reaction to splashes of working fluid.
7.6 Repairs carried out by specialist
A suitably qualified user is authorised to replace the complete valve, the seals at the base of the valve body, which are supplied as a spare set.
Operating instructions_PRM2X8-06_15314_1en_08/2023
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A defective valve must be removed and replaced with a new one. Repairs to a defective valve may only be carried out by the manufacturer.
When replacing the defective valve with a new one, proceed as follows:
› Ensure that no explosive atmosphere is present during the repair period. (see also 7.5).
› Switch off the pressure source (pump) of the hydraulic circuit (see also 7.5).
› Relieve the hydraulic circuit including the accumulators by connecting it to the tank (see also 7.5).
› Ensure that the hydraulic circuit is pressure-free (see also 7.5).
› Switch off the electrical supply to the directional control valve solenoids (see also 7.5).
› Ensure that the surface of the valve and solenoid coils is cooled to a low enough temperature to prevent skin burns (see also 7.5).
› Disconnect the electrical supply cable to the coils (see 7.6.3).
› Switch off the electrical supply to the position sensor (if the valve is equipped with one) and disconnect the M12x1 connector.
› Remove the coil surface ground wire by loosening the M5x10 ground screw.
› Clean the surface and surroundings of the dirctional control valve.
› Allow the remaining working fluid from the valve to drain into the prepared smaller container.
› When installing the new replacement valve, follow section 7.2 Product installation.
Remove residual working fluid from the dismantled defective valve, seal the ports with a shipping plate and package it to prevent mechanical damage
and contamination of the area outside the package during transport. Send the packaged valve with a description of the manifestation of the defect
to the manufacturer. A new valve is warranted by the manufacturer for 1 year. However, a claim may not be accepted by the manufacturer if the
valve is mechanically damaged, the seal material is damaged by aggressive liquid, or the valve has been shown to have been used improperly and not
in accordance with these instructions of use.
7.6.1 Replacing a defective valve
7.6.2 Replacing the sealing rings at the base of the valve body
› In case of leaks in the dividing plane, the sealing rings must be replaced with new ones. The disassembly and reassembly procedure is similar.
› Ensure that no explosive atmosphere is present during the repair (see also 6.5).
› Switch off the pressure source (pump) of the hydraulic circuit (see also 6.5).
› Lighten the hydraulic circuit including the accumulators by connecting it to the tank (see also 6.5).
› Ensure that the hydraulic circuit is depressurised (see also 6.5).
› Switch off the electrical supply to the directional control valve solenoids (see also 6.5).
› Make sure that the surface of the valve and solenoid coils is cooled to a low enough temperature to prevent skin burns (see also 6.5).
› Clean the surface and surroundings of the directional control valve.
› Loosen and unscrew the four fastening screws M5x30 DIN 912 10.9 using the inbus wrench A/F 4. Carefully remove the valve from the
connection plate.
› Allow the remaining working fluid from the valve to drain into the prepared smaller container.
› Using a small screwdriver, remove the sealing rings from the recess in the body.
› Work carefully to avoid damaging the sealing surfaces.
› Clean the connection surfaces of the valve body and plate. Check them for damage.
› Insert new sealing rings into the recesses in the valve body so that they do not fall out when the valve is reassembled.
› Insert the four fastening screws into the holes in the valve body and fasten the valve to the plate using the inbus wrench A/F 4. Tighten
the screws in a crosswise sequence to the specified torque of 8.9+1 Nm. Uneven tightening may cause deformation of the body and
unreliable valve function.
› If any of the fixing screws are damaged, replace them.
WARNING
Valve mounting screws
The screws must be mounting screws (SCREW M5x30 DIN 912 10.9), preferably from the valve manufacturer.
A screw of normal strength can be broken due to the high pressure in the hydraulic circuit and can cause
massive leakage of the working fluid.
› Check that the coil cables in the gland and the ground wires are properly secured to ensure that they are not loose when the valve is handled.
› After the repair, verify the new seals are tight and the valve is functioning properly.
Table of contents
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