POLNA Z1B Series Specification sheet

www.polna.com.pl
CONTROL VALVE
Z1B
®
type
INSTRUCTION MANUAL FOR INSTALLATION,
OPERATION AND USE
Edition Z1B/ 10 /20 22

Instruction manual for installation, operation and use
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Technical characteristics of the product
Marking Conformity marking
DN/NPS PN/CLASS PT [bar] TS [°C]
Date of pressure test
Serial number/ year of production
Category acc. to PED Category of fluid Liquid 
Gas 
List of contents:
1. Introduction
2. General warnings
3. Requirements for equipment used in potentially explosive
atmosphere according to Directive 2014/34/EU (ATEX)
4. Conditions of safe use
5. Design and operating principle
6. Dimensions
7. Normal operating conditions
8. Storage and transport
9. Installation
10. Start-up and assembly with drives
11. Service
12. Repair
13. List of spare parts
14. Product disposal
15. Troubleshooting
1. Introduction
The Instruction manual for installation, operation and use is
intended for products designed and manufactured according to
the requirements of the ISO 9001 quality management system,
Pressure Equipment Directive (PED) 2014/68/EU, ATEX
directive 2014/34/EU and AD2000 Merkblatt regulations,
intended for installation on pipelines.
2. General warnings
WARNING
Prior to the product installation and use, read carefully
and follow the Instruction. All activities related to
installation, operation and use of the product have to be
carried out by appropriatly trained and skilled staff.
"POLNA" S.A., hereinafter also called the manufacturer,
has highly qualified service staff able to assist in
installation, maintenance and repairs of our valves.
The warning symbol in the Instruction means that
the content (of a WARNING or CAUTION message) is very
important due to safety reasons. Failure to observe the
warnings may lead to a hazard to health, life or material
losses.
The product is intended for installation on pipelines.
Any other use has to be agreed with "POLNA" S.A. at the
stage of ordering of the product. If in doubt, contact
"POLNA" S.A. for explanation before performing any
further actions.
If the product is installed and maintained correctly, its
most ergonomic operation is ensured. However, it is
necessary to follow the requirements given in the
Instruction.
The product has to be installed and maintained
according to domestic and industrial regulations and
instruction.
The Instruction does not cover all cases and incidents
that may occur during installation, use and maintenance or
local safety regulations.
The content of the Instruction is of informative nature
and is considered to be true. The company reserves the
right to modifications, improvements and changes in the
technical data without notice.
"POLNA" S.A. is not liable for a valve selection made
by the buyer on his own or for operation and use of the
valve against its intended use. Failing to comply with the
provisions of this document, in particular when it comes to
use, repairs etc., will result in losing the guarantee and
warranty.
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Instruction manual for installation, operation and use
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3. Requirements for equipment used in
potentially explosive atmosphere according
to Directive 2014/34/EU (ATEX)
3.1 Conditions of completing
Z1B type valves are designed according to the
requirements for equipment operating in potentially explosive
atmosphere for group II, category 2 according to PN-EN 13463-
1:2002, considering the following in particular:
• ensuring operation according to technical parameters
established by the manufacturer and high level of protection,
• using the product in areas that can become potentially
explosive atmosphere caused by air mixtures with gases,
vapour, mist or dust.
3.2 Conditions of use
"Z1B” type valves marked as can be used for
operation in the following zones according to PN-EN 1127-1:
1997:
• Zone 1,
• Zone 2,
• Zone 21,
• Zone 22.
3.3 Conditions for repairs and maintenance
Safety conditions applying to tools and zones where they
can be used according to EN1127-1, Appendix A have to be
ensured during inspections, repairs and maintenance in
explosive atmospheres.
4. Conditions of safe use
The following rules have to be observed to ensure safe use:
• disassembly of the valve from a pipeline or disassembly of
parts in contact with the medium can be performed after
making sure that they are not subject to the action of the fluid
pressure,
• when working at high temperatures take care to avoid burns
caused by hot parts of the valve and use shields wherever
possible,
• valves have to be mounted and installed only by qualified
staff,
• rotation of the valve stem in the bonnet body is not
acceptable in valves with a bellows seal bonnet as the bellows
can become damaged.
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5. Design and operating principle
The basic components of a Z1B type control valve include:
body (1a, 1b), bonnet (2a, 2b, 2c), seat (3), valve plug (4a, 4b,
4c), control cage (6), plug stem (5) and valve plug stem sealing
(25). Marking and names of components are presented in
Figure 1 and Table 1.
The flow of the working medium through the valve is
adjusted by a linear movement of the valve plug with a fixed
connection with the stem of the actuator or manual drive.
Input signal being the following:
a) in pneumatic actuators:
compressed air with the nominal range of the control
pressure between 140 and 600 kPa or within other ranges if
a positioner is used,
b) in electric drives:
with a 3-point control
- electric signal with the supply voltage of 220 V AC; 24 V
AC; 380 V AC, 500V AC etc.,
with continuous control
- voltage signal 0…10 V; 2…10 V or current signal 0…5
mA; 0…20 mA; 4…20 mA, profibus and other
causes linear displacement of the drive stem. The
movement is proportional to the value of the input signal.
Table 1. Marking and names of components.
No. in
Figure 1
Component name
1a Flanged body
1b Valve body with butt welded ends (BW type)
1c Valve body with socket welded ends (SW type)
2a Standard bonnet
2b Extended bonnet
2c Bellows seal bonnet
3 Seat
4a Piston valve plug (unbalanced)
4b Piston valve plug balanced with a gasket
4c Piston valve plug balanced with a pilot
5 Valve stem
6 Control cage
7 Choking cage I
8 Choking cage II
9 Body gasket
10 Seat gasket
11 Control cage gasket
12 Plug stem pin
13 Balanced valve plug nut
14 Packing washer of balanced valve plug
15 Sealing ring of balanced valve plug
16 Pilot
17 Spring
18 Lock nut
19 Retainer ring
20 Locking ring
21 Guiding ring of balanced valve plug
22 Body screw
23 Body nut
24 Guiding sleeve
25 Packing
26 Pressing sleeve
27 Pressing lever
28 Distance sleeve
29 Spring
No. in
Figure 1
Component name
30 Packing washer
31 Bonnet screw
32 Bonnet nut
33 Fixing nut
34 Bellows seal bonnet housing
35 Packing set of bellows seal bonnet
36 Retaining plate
37 Packing set gasket
38 Bellows seal bonnet gasket
39 Pin
40 Retaining ring
41 Nut
42 Plug
43 Bellows seal bonnet housing screw
44 Bellows seal bonnet housing nut
45 Spacer sleeve
46 Packing
47 Distance sleeve
48 Packing set
49 Pressing sleeve
50 Disk spring
51 Pressing plate
52 Low nut
53 Nameplate
54 Round-head grooved pin
55 Actuator connector
Sealing ring of balanced valve plug (MUPU type)56 Pressing plate57 Washer with external tap58 Heksagon head screw59
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Standard bonnet with PTFE-
V sealing
Extended bonnet with
GRAPHITE sealing
Extended bonnet with
live loading sealing
bellows seal bonnet with
PTFE+GRAPHITE sealing
Control cage Control cage with one choking cage Control cage with two choking cages
Unbalanced valve plug Balanced valve plug with a gasket Balanced valve plug with a pilot
Flanged body (FL type) Valve body with butt welded ends
(BW type)
Valve body with socket welded
ends (SW type)
Fig. 1. Z1B type control valve - internal components
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Fig. 2. Z1B type control valve with a unbalanced valve plug
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Fig. 3. Z1B type control valve with a unbalanced valve plug
Fig. 4. Z1B type control valve with
a unbalanced valve plug
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Fig. 5. Z1B type control valve with a balanced valve plug with a gasket
Fig. 6. Z1B type control valve with a balanced valve plug with a seal
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Fig. 7. Z1B type control valve with a balanced valve plug with a seal
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Fig. 8. Z1B type control valve with a balanced valve plug with a pilot
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Fig. 9. Z1B type control valve with a balanced valve plug with a pilot
Fig. 10. Z1B type control valve with a balanced valve plug with a pilot
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6. Dimensions
Valve with a flanged connection (FL type)
Dimension E for the valve plug position - valve closed *) If mounted with
P/R 1000 actuator - dimensions: E=195 mm and F=115 mm
Valve with socket welded ends (SW type) DN 15 ... 50
Valve with butt welded ends (BW type)
Fig. 11. Dimensions of valves
Table 2a. Connection dimensions of control valves.
DN 25 40 50
PN/CL PN10...
CL300 PN63... CL600 CL900; PN160
PN250;
CL1500
PN320
PN400;
CL2500
PN10...
CL300 PN63... CL600 CL900; PN160
PN250;
CL1500
PN32
0 PN400; CL2500
PN10...CL
300 PN63...CL 600 CL900; PN160
PN250;
CL1500
PN320
PN400;
CL2500
105108988311 0989385759080757063B max 11 8
C
237175155214172145193149135DS
DW 402345326385348306364320306
DM -----270-----254-----254
80DN 100 150
PN/CL PN10...
CL300 PN63... CL600 CL900; PN160
PN250;
CL1500
PN320
PN400;
CL2500
PN10...
CL300 PN63... CL600 CL900; PN160
PN250;
CL1500
PN32
0 PN400; CL2500
CL900;PN160PN63...CL600PN10…CL300
1168155145138128153138133120145105B max 19017816085
C
365287329252217257233206DS
DW 483426498442407447402375
DM --470-----405-----405
DN300 and DN400 - special design,
technical data according to individual
arrangements. (refers to Tables 2a and
2b)
200DN 250
PN10...CL300PN63...CL600PN10...CL300PN/CL PN10...CL300
(kv800) PN63...CL600
255258235190B max
C
439DS 458
DW 539 558
DM -660580-580
NOTE: Weight of a valve with a standard bonnet without an actuator.
Table 2b. Connection dimensions of control valves.
DN 25…50 50 80 80; 100 80; 100 100 150 200 200; 250 250
Kvs 10…25 40 25 40 63; 94 125; 160 63; 94 125; 160 200; 250 320 94
125;
160
200; 250 320 500
630;
800
Stroke 20 38 20 38 38 50 38 50 63 80 38 50 63 80 1 00
d
1
M12x1.25 M16x1.5 M20x1.5 M16x1.5 M20x1.5 M24x1.5
d1) 2
57,15 / 2 1/4”-16UN2A 84,15 / 3 5/16”-18NS2A 95,25 / 3 3/4”-12UN2A
d
3
12 16 20 24
NOTE:
1)
Dimension d
2
= 84.15 f9 for valves DN80 and 100 with live loading sealing.
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Table 3. Face-to-face dimensions of control valves with flanged connections.
DN
Dimension A [mm]
PN / DIN CL
10; 16; 25;
40
63 - 100 160 250 -320 400 CL150 CL300 CL600 CL900 CL1500 CL2500
25 160 230 230 260 300 184 197 210 248 273 308
40 200 260 260 300 350 222 235 251 270 3 11 359
50 230 300 300 350 400 254 267 286 3 11 340 400
80 310 380 380 450 500 298 317 336 387 460 498
100 350 430 430 520 580 352 368 394 464 530 575
150 480 550 550 * * 451 473 508 556 * *
200 600 650 * * * 543 568 610 * * *
250 730 775 * * * 673 708 752 * * *
300
special design, technical data according to individual arrangements
400
* technical data according to individual arrangements
"A" face-to-face dimensions given in Table 3 foNOTE: r CL150; CL300; CL600; CL900; CL1500 and CL2500 apply to bodies
with face B (RF). For other designs, the A1 lengths can be calculated based on the relation specified in Table 4.
Table 4. Algorithms for calculating the lengths of control valves with flanged connections.
- with a groove
- with races
- with a groove for a ring
Body type and marking
Pressure CL DN A
1
PN / ANSI
With a groove
DL / (GF)
With races
F / (FF)
CL300
25…250
A
1
= A + 5 x 2
CL600
CL900
CL1500
CL2500
A
1
= A - 1.5 x 2
With a groove for a ring
J / (RTJ)
CL150 25…250
A
1
= A +6.5 x 2
CL300 25…40
CL300 50…250 A
1
= A + 8 x 2
CL600
CL900
CL1500
25…40
A
1
= A
CL2500 25
CL600 50…250
A
1
= A + 1.5 x 2
CL900
CL1500
50…100
CL900 150
CL2500
80 A
1
= A + 3 x 2
100 A
1
= A + 4.5 x 2
Table 5. Face-to-face dimensions of control valves with butt welded ends
DN
Dimension A [mm]
Nominal pressure identification
PN 10...CL600
CL900…PN160
PN250...CL2500
25 210 230 300
40 251 260 350
50 286 300 400
80 337 380 500
100 394 430 580
150 508 550 -
200 610 - -
250 752 - -
300
special design, technical data according to individual arrangements
400
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7. Normal operating conditions
The control valve should be used at pressure,
temperature and medium type with parameters complying
with the ones assumed for calculating the value and for
identifying the design and material variant of the valve. To
ensure failure-free operation during the whole service life,
the control valve and its accessories and equipment have
to be protected against impact and damage and subject to
regular maintenance and periodical inspections.
A valve used at high (> 50°C ) or low temperatures (<
0°C) has to be properly insulated or marked. Failing to
observe this condition may result in personal injury.
Failure to observe the instruction may result in body
injury.
It is forbidden to disassemble the actuator or drive from
the valve, if the valve is under pressure. Moving parts of
the valve may cause body injury.
8. Storage and transport
NOTE
The valve shall be stored under conditions ensuring its
failure-free operation even after a long period of storage.
Warehouse spaces should be closed, dry and airy with
the relative humidity not exceeding 80%. The atmosphere
should be free of vapours and aggressive gases.
The valve can be transported by any covered means of
transport, with or without its packaging, protected against
throwing, collapsing or excess shock. During packing,
loading or unloading handle the valves using flexible
clamps (e.g. rubber V-belts) wrapped around the valve
body flanges and actuator diaphragm case (through an eye
bolt - for pneumatic actuators).
9. Installation
Exercise care while unpacking the valve so as not to
damage the valve or its accessories. If any problems occur,
contact "POLNA" S.A.
WARNING
Z1B type control valves (Edition_ 10/2022 )
Prior to installing the valve, read carefully the
Instruction. The Instruction contains information and
warnings on safety that have to be observed strictly.
Otherwise a serious injury to the operator or persons
standing nearby may occur or the equipment may be
seriously damaged.
Prior to installing the valve in a pipeline system, the
following have to be performed:
1. Carefully clean the pipeline of contaminants, metal
chips, rust, welding and rolling scale, fat and grease and
any other foreign bodies. It is of particular importance for
valves with a perforated plug or control cage. Thoroughly
clean the surface of gaskets to ensure correct tightness of
connections.
2. Remove caps and elements of transport packaging
from the valve to be installed.
3. If the valve is activated for the first time after more
than 3 months from the date of its purchase, check the
stem movement smoothness prior to its installation on the
site. Start the actuator or drive and check whether the
valve stem (5) moves smoothly and with no disturbance
within the entire range of the nominal stroke. If the
movement is not smooth, contact "POLNA" S.A. service.
4. The allowed position of the control valve is with the
stem vertically upwards. In justified cases, it is possible to
install the valve with a permissible deviation of ±30° from
the vertical. Other positions may cause uneven and
accelerated wear of internal parts of the valve (plug, seat,
stem, guide sleeve) and seals.
If it is necessary to use a different valve installation
position on the pipeline than permitted, consultation with
the valve manufacturer is mandatory.
Without the approval of the manufacturer, an
unauthorised installation position will result in loss of
guarantee.
5. The valve shall be installed so that the direction of
the working medium flow in the pipeline is according to
the direction marked by the arrow on the valve body. If the
direction of the flow is not marked in the centre of the
body, it is marked on the flange.
6. The working pressure of the medium flowing through
the valve should comply with the value assumed for the
nominal pressure given on the valve nameplate.
7. When installing the valve, follow standard procedures
for making pipe connections and welding. Use a correct
gasket between the valve flange and the pipeline system
with flanged connections.
8. The valve location should take the following
requirements into account:
- straight sections of the pipeline 20xDN before the
valve and 10xDN after the valve. In systems intended for
light working conditions and less serious applications,
straight sections with the minimum lengths of 6xDN before
the valve and 3xDN after the valve can be used.
- pressure measurement points ca. (1-2)xDN before the
valve and (4-6)xDN after the valve,
- distances to provide access to the actuator - min. 300
mm around the diaphragm case and min. 500 mm above
the actuator.
9. If the valve is welded, welding shall be performed
observing safety measures i.e. at many sections so that
the body interior is not heated to a temperature exceeding
the maximum acceptable temperature or so that no
contaminants, e.g. scale, get inside the valve. The valve
has to remain open during welding (plug lifted above the
seat).
10. If the nominal diameter of the valve is smaller than
the diameter of the pipeline, use appropriate reducers
whose length complies with relevant standards. In such
cases, avoid using threaded, femal-male reducers etc.
In process system units it is recommended to use a by-
pass system composed of three additional valves, allowing
for disconnecting the control valve from the system (e.g.
for making repairs, grinding of seats, replacement of parts)
with no breaks in the operation.
11. When connecting with adjacent elements pay
attention not to stress the body and adapt the connecting
elements (screws, sealing rings, flanges) to the shape of
the body and its operating conditions. If necessary, use a
support to prevent stress to the body (the support can be
placed under the valve flanges).
12. Make sure that lifting equipment, chains and slings
with appropriate load bearing capacity are used for
handling the valve.
13. Do not paint the screws when painting pipelines. If
construction works are carried out, protect the fixtures
against dust, sand and residues of building materials (they
should be covered with appropriate materials).
14. The manufacturer is not responsible for fixtures, if
the user fails to observe the provisions of the Instruction.
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10. Start-up and assembly with drives
Prior to start-up of the process system, check the operation
of the installed valve. Start the actuator or manual drive and
check whether the valve stem moves smoothly and with no
disturbance within the entire range of the nominal stroke. If the
movement is not smooth, contact "POLNA" S.A. service.
NOTE
Prior to start-up, take the following recommendations
into consideration:
1. The first filling of the pipeline has to be performed
with the valve open.
2. Use the by-pass or completely cut-off the valve from
the working pressure and then release process pressure
on both sides of the valve. Avoid a sudden release of the
working pressure as it may cause injury to the operators.
Release the process medium on both sides of the valve.
3. The bonnet nuts are tightened in the plant before
delivery but before starting the valve make sure they have
not come loose or that there is no leakage within the valve
stem. A leaking bonnet may cause injury to the operators.
If there are leaks within the valve stem, perform
relevant actions described in the Instruction (Table 9).
4. For pneumatic actuators - vent the actuator system
and relieve the tension of its springs.
5. To avoid injury, when doing installation and service
works, wear gloves, protective clothing and glasses.
6. Always check occupational safety with the
responsible person whether there is no need to take extra
precautions against the process medium.
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Assembly with valves
Fig. 12. Z1B type control valve with P/R pneumatic actuator Fig. 13. Z1B type control valve with P1/R1 pneumatic
actuator
Fig. 14. Z1B type control valve with a post-style
electric drive
Fig. 15. Z1B type control valve with electric drive and linear
gear
Prior to assembly, installation and adjustment of Z1B type control valves with pneumatic and electric drives, read the
instructions in the Operation and Maintenance Documentation of the drive manufacturer.
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11. Service
The service of a control valve during its use involves
maintaining appropriate tightness of the valve pressure
chamber and ensuring its operating capacity.
For valves operating on a continuous basis it is
recommended to perform regular inspections every 6 months,
while for valves operating on a non-continuous basis every 12
months. The inspection covers a visual check of the valve
operation, checking its external tightness, settings and correct
adjustment. If the valve does not operate correctly, e.g. there
are leaks on the bonnet partition or within the stem, the valve
jams during operation or reveals poor adjustment, perform
relevant actions described in the Instruction (Table 9).
If the valve operates correctly, there is no need to perform
disassembly or inspection of internal parts.
12. Repair
The following activities shall be performed within the repair:
• cleaning of the valve and evaluation of the degree of its
components wear,
• grinding of the seat and valve plug,
• replacement of the seat, plug, stem and pilot,
• replacement of the valve bonnet gaskets,
• replacement of the body, seat and plug gaskets,
• replacement of the housing gaskets and packing set (for a
bellows seal bonnet).
WARNING
Prior to repair, release the pressure in the whole valve
and cool it down.
Disconnect all supply cables of compressed air as well
as electric and signal supply cables from the actuator or
drive. Make sure that the actuator or drive cannot
incidentally open or close the valve. Never disassemble an
actuator or drive from the valve when the valve is under
pressure.
Disconnect the valve from the rest of the system with cut-
off valves and release the working fluid.
Disassembly a bonnet under pressure poses a potential
hazard to life!
The valve bonnet may contain process medium under
pressure, even if the valve has been removed from the
process system. The process medium can flow under
pressure when the bonnet elements or sealing rings are
being disassembled.
To prevent penetration of foreign bodies into the body
and to avoid damage to the equipment, cover the hole in
the valve body.
NOTE
It is recommended to use original spare parts. If the
user fails to observe the rule, it releases the manufacturer
from the liability for the product, leads to a loss of
guarantee rights and may result in incorrect operation of
the valve, constituting hazard to occupational safety.
Internal elements of the valve are accessible after removing
the actuator or drive. When removing the actuator or drive,
perform the following:
a) disconnect the cables supplying the input signal to the
actuator or drive and remove the valve from the system. In the
case of a pneumatic actuator with a positioner, disconnect the
line supplying the electric control signal and supply air,
b) disconnect the connection between the valve stem and
the actuator of drive stem,
c) loosen the nut (33) mounting the actuator or drive and
disconnect it from the valve,
After removing the actuator or drive, disassemble the valve
and separate its internal components as described below.
12.1 Disassembly of the bonnet
12.1.1 Valve with unbalanced plug
a) loosen the nuts (32) of the bonnet screws,
b) undo the nuts (23) on the body screws,
c) disassemble the bonnet (2a, 2b) with the stem (5) and
plug (4a) as one assembly,
d) remove the control cage (6) with choking cages I (7) and
II (8) from the body. If an control cage gasket (11) occurs in the
valve, remove the gasket as well.
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e) remove the seat (3) with gaskets of the body (9) and
seats (10),
f) remove the valve plug (4a) with stem (5) from the bonnet
as one assembly,
g) clean and check the condition of the sealing surfaces of
the body for the seat and bonnet and the body interior,
h) clean and inspect the condition of the face surfaces of
the seat (3) and plug (4a) and guiding surfaces of the stem and
plug,
i) check whether the pass-through holes of the control cage
and choking cage are not clogged. Restore passage of the
holes, if necessary.
12.1.2 Valve with a valve plug balanced with a seal
a) loosen the nuts (32) of the bonnet screws,
b) undo the nuts (23) on the body screws,
c) disassemble the bonnet (2a, 2b) with the stem (5) and
plug (4b) and control cage (6) as one assembly, paying
attention not to let the valve plug get out of the control cage.
NOTE
The sealing ring of the valve plug (15) is tensioned.
Failure to observe the notification will cause damage to the
ring.
If the ring is damaged, replace it with a new one according
to p. 12.6.
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d) remove the choking cages I (7) and II (8) from the body.
If an control cage gasket (11) occurs in the valve, remove the
gasket as well.
e) remove the seat (3) with gaskets of the body (9) and
seats (10),
control cage f) remove the valve plug (4b) with a stem (5)
and control cage (6) from the bonnet as one assembly, paying
attention not to let the valve plug get out of the control cage,
g) clean and check the condition of the sealing surfaces of
the body for the seat and bonnet and the body interior,
h) clean and inspect the condition of the face surfaces of
the seat (3) and plug (4b) and guiding surfaces of the stem (5),
plug and control cage (6),
i) check whether the pass-through holes of the control cage
and choking cage are not clogged. Restore passage of the
holes, if necessary.
12.1.3 Valve with a plug balanced with a pilot
a) loosen the nuts (32) of the bonnet screws,
b) undo the nuts (23) on the body screws,
c) disassemble the bonnet (2a, 2b) with the stem (5) and
plug (4c) as one assembly,
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d) remove the control cage (6). If an control cage gasket
(11) occurs in the valve, remove the gasket as well.
e) remove the seat (3) with gaskets of the body (9) and
seats (10),
f) remove the valve plug (4c) with the stem (5) from the
bonnet as one assembly,
g) clean and check the condition of the sealing surfaces of
the body for the seat and bonnet and the body interior,
h) clean and inspect the condition of the face surfaces of
the seat (3), plug (4c) and the pilot (16), guiding surfaces of the
stem (5) and plug, spring (17) and guiding rings (21),
i) check whether the pass-through holes of the control cage
and choking cage are not clogged. Restore passage of the
holes, if necessary.
12.1.4 Valve with a bellows bonnet
a) loosen the nuts (32) of the bonnet screws,
b) undo the nuts (44) on the screws of the bellows seal
bonnet housing,
c) disassemble the bellows seal bonnet (2c),
Z1B type control valves (Edition_ 10/2022 )
EN