Samson 3246 Service manual

Translation of original instructions
EB 8046 EN
Type3246 as globe and three-way valve
Edition February 2022
Type3246 Valve · ANSI and DIN versions
In combination with an actuator,
e.g. a Type3271 or Type3277 Pneumatic Actuator

Denition of signal words
Hazardous situations which, if not avoided,
will result in death or serious injury
Hazardous situations which, if not avoided,
could result in death or serious injury
Property damage message or malfunction
Additional information
Recommended action
DANGER
!
WARNING
!
NOTICE
!
Note
Tip
EB 8046 EN
Note on these mounting and operating instructions
These mounting and operating instructions assist you in mounting and operating the device
safely. The instructions are binding for handling SAMSON devices. The images shown in
these instructions are for illustration purposes only. The actual product may vary.
ÎFor the safe and proper use of these instructions, read them carefully and keep them for
later reference.
ÎIf you have any questions about these instructions, contact SAMSON‘s After-sales Service
([e-mail]).
Documents relating to the device, such as the mounting and operating
instructions, are available on our website at www.samsongroup.com >
Service & Support > Downloads > Documentation.

Contents
EB 8046 EN
1 Safety instructions and measures ................................................................1-1
1.1 Notes on possible severe personal injury ......................................................1-4
1.2 Notes on possible personal injury ................................................................1-5
1.3 Notes on possible property damage .............................................................1-7
1.4 Notes on the use of an RFID tag ...................................................................1-8
1.5 Warnings on the device ...............................................................................1-9
2 Markings on the device ..............................................................................2-1
2.1 Valve nameplate .........................................................................................2-1
2.2 Actuator nameplate .....................................................................................2-2
2.3 Material identication number .....................................................................2-2
2.4 Optional RFID tag .......................................................................................2-2
3 Design and principle of operation ...............................................................3-1
3.1 Fail-safe positions .......................................................................................3-4
3.1.1 Globe valve ................................................................................................3-4
3.1.2 Three-way valve ..........................................................................................3-4
3.2 Versions .....................................................................................................3-4
3.3 Additional ttings ........................................................................................3-5
3.4 Valve accessories ........................................................................................3-5
3.5 Technical data ............................................................................................3-5
4 Shipment and on-site transport ...................................................................4-1
4.1 Accepting the delivered goods .....................................................................4-1
4.2 Removing the packaging from the valve ........................................................4-1
4.3 Transporting and lifting the valve ..................................................................4-1
4.3.1 Transporting the valve .................................................................................4-3
4.3.2 Lifting the valve ...........................................................................................4-3
4.4 Storing the valve .........................................................................................4-6
5 Installation.................................................................................................5-1
5.1 Installation conditions ..................................................................................5-1
5.2 Preparation for installation ...........................................................................5-2
5.3 Mounting the device ....................................................................................5-3
5.3.1 Mounting the external anti-rotation xture .....................................................5-3
5.3.2 Mounting the actuator onto the valve ..........................................................5-13
5.3.3 Installing the valve into the pipeline ............................................................5-15

Contents
EB 8046 EN
5.4 Testing the installed valve ...........................................................................5-15
5.4.1 Leak test ...................................................................................................5-17
5.4.2 Travel motion ............................................................................................5-17
5.4.3 Fail-safe position .......................................................................................5-17
5.4.4 Pressure test ..............................................................................................5-17
6 Start-up .....................................................................................................6-1
7 Operation..................................................................................................7-1
7.1 Normal operation .......................................................................................7-2
7.2 Manual operation .......................................................................................7-2
8 Malfunctions ..............................................................................................8-1
8.1 Troubleshooting ..........................................................................................8-1
8.2 Emergency action .......................................................................................8-2
9 Servicing....................................................................................................9-1
9.1 Periodic testing ...........................................................................................9-3
9.2 Preparing the valve for service work .............................................................9-4
9.3 Installing the valve after service work ............................................................9-5
9.4 Service work...............................................................................................9-5
9.4.1 Replacing the gasket ...................................................................................9-5
9.4.2 Replacing the circulation inhibitor .................................................................9-8
9.4.3 Replacing the packing ...............................................................................9-11
9.4.4 Replacing the seat and plug .......................................................................9-13
9.5 Ordering spare parts and operating supplies ..............................................9-16
10 Decommissioning .....................................................................................10-1
11 Removal ..................................................................................................11-1
11.1 Removing the valve from the pipeline ..........................................................11-2
11.2 Removing the actuator from the valve .........................................................11-2
12 Repairs ....................................................................................................12-1
12.1 Returning devices to SAMSON ..................................................................12-1
13 Disposal...................................................................................................13-1
14 Certicates...............................................................................................14-1
15 Annex......................................................................................................15-1
15.1 Tightening torques, lubricants and tools ......................................................15-1
15.2 Spare parts ..............................................................................................15-1
15.3 After-sales service .....................................................................................15-4

EB 8046 EN 1-1
Safety instructions and measures
1 Safety instructions and measures
Intended use
The SAMSON Type3246 Globe Valve in combination with an actuator (e.g. Type3271 or
Type3277 Pneumatic Actuator) is designed to regulate the ow rate, pressure or temperature
of liquids, gases or vapors.
The valve with its actuator is designed to operate under exactly dened conditions (e.g. oper-
ating pressure, process medium, temperature). Therefore, operators must ensure that the con-
trol valve is only used in operating conditions that meet the specications used for sizing the
valve at the ordering stage. In case operators intend to use the control valve in other applica-
tions or conditions than specied, contact SAMSON.
SAMSON does not assume any liability for damage resulting from the failure to use the de-
vice for its intended purpose or for damage caused by external forces or any other external
factors.
ÎRefer to the technical data and nameplate for limits and elds of application as well as
possible uses.
Reasonably foreseeable misuse
The control valve is not suitable for the following applications:
− Use outside the limits dened during sizing and by the technical data
− Use outside the limits dened by the valve accessories connected to the valve
Furthermore, the following activities do not comply with the intended use:
− Use of non-original spare parts
− Performing service and repair work not described
Qualications of operating personnel
The control valve must be mounted, started up, serviced and repaired by fully trained and
qualied personnel only; the accepted industry codes and practices must be observed. Ac-
cording to these mounting and operating instructions, trained personnel refers to individuals
who are able to judge the work they are assigned to and recognize possible hazards due to
their specialized training, their knowledge and experience as well as their knowledge of the
applicable standards.
Welding operations must only be performed by personnel who has the necessary qualica-
tion to perform the applied welding procedure and handle the materials used.

1-2 EB 8046 EN
Safety instructions and measures
Personal protective equipment
We recommend checking the hazards posed by the process medium being used (e.g.
uGESTIS (CLP) hazardous substances database). Depending on the process medium and/
or the activity, the protective equipment required includes:
− Protective clothing, gloves, eye protection and respiratory protection in applications with
hot, cold and/or corrosive media
− Wear hearing protection when working near the valve
− Hard hat
− Safety harness when working at height
− Safety footwear, ESD (electrostatic discharge) footwear, if necessary
ÎCheck with the plant operator for details on further protective equipment.
Revisions and other modications
Revisions, conversions or other modications of the product are not authorized by SAMSON.
They are performed at the user's own risk and may lead to safety hazards, for example. Fur-
thermore, the product may no longer meet the requirements for its intended use.
Safety features
The fail-safe position of the control valve upon air supply or control signal failure depends on
the actuator used (see associated actuator documentation). When the valve is combined with
a SAMSON Type3271 or Type3277 Pneumatic Actuator, the valve moves to a certain fail-
safe position (see the 'Design and principle of operation' section) upon supply air or control
signal failure. The fail-safe action of the actuator is the same as its direction of action and is
specied on the nameplate of SAMSON actuators.
Warning against residual hazards
To avoid personal injury or property damage, plant operators and operating personnel must
prevent hazards that could be caused in the control valve by the process medium, the operat-
ing pressure, the signal pressure or by moving parts by taking appropriate precautions. Plant
operators and operating personnel must observe all hazard statements, warning and caution
notes in these mounting and operating instructions.
Hazards resulting from the special working conditions at the installation site of the valve must
be identied in a risk assessment and prevented through the corresponding safety instruc-
tions drawn up by the operator.

EB 8046 EN 1-3
Safety instructions and measures
Responsibilities of the operator
Operators are responsible for proper use and compliance with the safety regulations. Opera-
tors are obliged to provide these mounting and operating instructions as well as the refer-
enced documents to the operating personnel and to instruct them in proper operation. Fur-
thermore, operators must ensure that operating personnel or third parties are not exposed to
any danger.
Operators are additionally responsible for ensuring that the limits for the product dened in
the technical data are observed. This also applies to the start-up and shutdown procedures.
Start-up and shutdown procedures fall within the scope of the operator's duties and, as such,
are not part of these mounting and operating instructions. SAMSON is unable to make any
statements about these procedures since the operative details (e.g. differential pressures and
temperatures) vary in each individual case and are only known to the operator.
Responsibilities of operating personnel
Operating personnel must read and understand these mounting and operating instructions as
well as the referenced documents and observe the specied hazard statements, warnings
and caution notes. Furthermore, operating personnel must be familiar with the applicable
health, safety and accident prevention regulations and comply with them.
Referenced standards, directives and regulations
The control valves comply with the requirements of the European Pressure Equipment Direc-
tive 2014/68/EU and the Machinery Directive 2006/42/EC. Valves with a CE marking
have a declaration of conformity which includes information about the applied conformity
assessment procedure. The 'Certicates' section contains this declaration of conformity.
According to the ignition hazard assessment performed in accordance with Clause5.2 of
ISO80079-36, the non-electrical control valves do not have their own potential ignition
source even in the rare incident of an operating fault. As a result, they do not fall within the
scope of Directive 2014/34/EU.
ÎFor connection to the equipotential bonding system, observe the requirements specied in
section6.4 of EN60079-14 (VDE0165-1).
Referenced documentation
The following documents apply in addition to these mounting and operating instructions:
− Mounting and operating instructions for the mounted actuator, e.g. uEB8310-X for the
SAMSON Type3271 or Type3277 Pneumatic Actuator
− Mounting and operating instructions for mounted valve accessories (positioner, solenoid
valve etc.)

1-4 EB 8046 EN
Safety instructions and measures
1.1 Notes on possible severe personal injury
DANGER
!
Risk of bursting in pressure equipment.
Valves and pipelines are pressure equipment. Impermissible pressure or improper
opening can lead to valve components bursting.
ÎObserve the maximum permissible pressure for valve and plant.
ÎBefore starting any work on the control valve, depressurize all plant sections affect-
ed as well as the valve.
ÎDrain the process medium from all the plant sections concerned as well as the
valve.
− uAB0100 for tools, tightening torques and lubricant
− Manual uH02: Appropriate Machinery Components for SAMSON Pneumatic Control
Valves with a Declaration of Conformity of Final Machinery
− For oxygen service: Manual uH01
The packaging of valve constructed and sized for oxygen service has the following label
on it:
Sauerstoff!
Oxygen!
Oxygène!
− When a substance is used in the device, which is listed as being a substance of very high
concern on the candidate list of the REACH regulation:
Information on safe use of the part affected
uwww.samsongroup.com > About SAMSON > Material Compliance > REACH
If a device contains a substance which is listed as being a substance of very high concern
on the candidate list of the REACH regulation, this circumstance is indicated on the
SAMSON delivery note.

EB 8046 EN 1-5
Safety instructions and measures
DANGER
!
Risk of injury due to incorrect handling of oxygen or cryogenic gases in applica-
tions.
The valve can be used for oxygen service or applications with cryogenic gases.
Oxygen is a hazardous substance, which reacts quickly, leading to combustion and
explosions. Contact with cryogenic gases causes severe frostbite and cold burns
(cryogenic burns). Operating personnel must be trained for these applications.
Unqualied operating personnel expose themselves and others to an increased risk of
injury.
ÎOperating personnel must be sufciently trained and be made aware of the
hazards in applications involving oxygen or cryogenic gases.
ÎInstructions and information on how to safely handle devices for oxygen service
can be found in the Manual uH01.
All SAMSON staff receives appropriate training before performing any activities in connec-
tion with oxygen service. SAMSON's After-sales Service also offers such training courses for
service staff to allow them to learn how to handle devices for the above listed applications
correctly and safely.
1.2 Notes on possible personal injury
WARNING
!
Risk of burn injuries due to cold components and pipelines.
Depending on the process medium, valve components and pipelines may get extremely
cold and cause cryogenic burns.
ÎAllow components and pipelines to reach ambient temperature.
ÎWear protective clothing and safety gloves.
Tip

1-6 EB 8046 EN
Safety instructions and measures
WARNING
!
Risk of hearing loss or deafness due to loud noise.
The noise emissions depend on the valve version, plant facilities and process medium.
ÎWear hearing protection when working near the valve.
Risk of personal injury due to exhaust air being vented.
While the valve is operating, air is vented from the actuator, for example, during
closed-loop operation or when the valve opens or closes.
ÎInstall the control valve in such a way that vent openings are not located at eye level
and the actuator does not vent at eye level in the work position.
ÎUse suitable silencers and vent plugs.
ÎWear eye protection when working in close proximity to the control valve.
Crush hazard arising from moving parts.
The control valve contains moving parts (actuator and plug stem), which can injure
hands or ngers if inserted into the valve.
ÎDo not insert hands or nger into the yoke while the air supply is connected to the
actuator.
ÎBefore working on the control valve, disconnect and lock the pneumatic air supply
as well as the control signal.
ÎDo not impede the movement of the actuator and plug stem by inserting objects into
the yoke.
ÎBefore unblocking the actuator and plug stem after they have become blocked (e.g.
due to seizing up after remaining in the same position for a long time), release any
stored energy in the actuator (e.g. spring compression). See associated actuator
documentation.
Risk of personal injury due to preloaded springs.
Valves in combination with pneumatic actuators with preloaded springs are under ten-
sion. These control valves with SAMSON pneumatic actuators can be identied by the
long bolts protruding from the bottom of the actuator.
ÎBefore starting any work on the actuator, relieve the compression from the preload-
ed springs (see associated actuator documentation).

EB 8046 EN 1-7
Safety instructions and measures
WARNING
!
Risk of personal injury due to residual process medium in the valve.
While working on the valve, residual medium can ow out of the valve and, depending
on its properties, cause personal injury, e.g. (chemical) burns.
ÎIf possible, drain the process medium from all the plant sections affected and the
valve.
ÎWear protective clothing, safety gloves, respiratory protection and eye protection.
Risk of personal injury through incorrect operation, use or installation as a result of
information on the valve being illegible.
Over time, markings, labels and nameplates on the valve may become covered with dirt
or become illegible in some other way. As a result, hazards may go unnoticed and the
necessary instructions not followed. There is a risk of personal injury.
ÎKeep all relevant markings and inscriptions on the device in a constantly legible
state.
ÎImmediately renew damaged, missing or incorrect nameplates or labels.
1.3 Notes on possible property damage
NOTICE
!
Risk of valve damage due to contamination (e.g. solid particles) in the pipeline.
The plant operator is responsible for cleaning the pipelines in the plant.
ÎFlush the pipelines before start-up.
Risk of valve damage due to unsuitable medium properties.
The valve is designed for a process medium with dened properties.
ÎOnly use the process medium specied for sizing the valve.
Risk of leakage and valve damage due to excessively high or low tightening torques.
Observe the specied torques when tightening control valve components. Excessive
tightening torques lead to parts wearing out more quickly. Parts that are too loose may
cause leakage.
ÎObserve the specied tightening torques (uAB0100).

1-8 EB 8046 EN
Safety instructions and measures
NOTICE
!
Risk of valve damage due to the use of unsuitable tools.
Certain tools are required to work on the valve.
ÎOnly use tools approved by SAMSON (uAB0100).
Risk of valve damage due to the use of unsuitable lubricants.
The lubricants to be used depend on the valve material. Unsuitable lubricants may cor-
rode and damage surfaces.
ÎOnly use lubricants approved by SAMSON (uAB0100).
Risk of the process medium being contaminated through the use of unsuitable lubri-
cants and/or contaminated tools and components.
ÎKeep the valve and the tools used free from solvents and grease.
ÎMake sure that only suitable lubricants are used.
1.4 Notes on the use of an RFID tag
The RFID tag is subject to certain restrictions due to its application range (technical specica-
tions).
ÎObserve the explosion protection certicates of the RFID tag when it is to be used on
valves installed in potentially explosive atmospheres.
ÎDo not expose the RFID tag to strong electric elds.
ÎAvoid electrostatic charging.
ÎObserve the application range (technical specications) of the RFID tag.

EB 8046 EN 1-9
Safety instructions and measures
1.5 Warnings on the device
Warning Meaning of the warning Location on the device
Warning against moving parts
There is a risk of injury to hands or ngers through the
stroking movement of the actuator and plug stem if they
are inserted into the yoke while the air supply is con-
nected to the actuator.

1-10 EB 8046 EN

EB 8046 EN 2-1
Markings on the device
2 Markings on the device
2.1 Valve nameplate
22
21
20 19
1817
16
151413121110
8
7
6
5
4
2
1
Fig.2-1: Inscriptions on the valve nameplate
Fig.2-1 and the inscription table list all pos-
sible characteristics and options that may
appear on a valve nameplate. Only the in-
scriptions relevant to the ordered Type3246
Valve actually appear on the nameplate.
Note
Item Inscription meaning
1 Data Matrix code
2 Type designation
4 Material
5 Month and year of manufacture
6 Valve size:
DIN: DN · ANSI: NPS · JIS: DN
7 Pressure rating:
DIN: PN · ANSI: CL · JIS: K
8 Order number/item
10 Flow coefcient:
DIN: KVS · ANSI: CV
11 Characteristic:
%: equal percentage · LIN: linear
mod-lin: modied linear
NO/NC: on/off service
12 Seat-plug seal:
ME: metal · HA: carbide metal ·
ST: metal base material with Stellite® facing
KE: ceramic · PT: PTFE soft seal · PK: PEEK
soft seal
13 Seat code (trim material): on request
14 Pressure balancing:
DIN: D · ANSI/JIS: B
Version:
M: mixing valve · V: ow-diverting valve
Item Inscription meaning
15 Noise reduction:
1:ow divider(ST)1 · 2:ST2 · 3:ST3
1/PSA:ST1 standard and integrated in
seat for PSA valve ·
AC-1/AC-2/AC-3/AC-5:AC trim, versions
1 to 5 ·
LK: perforated plug · LK1/LK2/LK3:perfo-
rated plug with ow divider ST1 to ST3 ·
MHC1:multi-hole cage ·
CC1:Combi Cage · ZT1:Zero Travel
16 Country of origin
17 PSA version:
PSA
18 Cage/seat style:
CC: clamped cage, clamped seat
SF: suspended cage, anged seat
19 CE marking
20 ID of the notied body
PED: Pressure Equipment Directive
G1/G2: gases and vapors
Fluid group1= hazardous
Fluid group2= other
L1: liquids
Fluid group1= hazardous
Fluid group2= other
I/II/III: Category 1 to 3
21 Serial number
22 NE53 (NAMUR Recommendation)

2-2 EB 8046 EN
Markings on the device
The nameplate is afxed to the intermediate
piece or yoke of the valve (see Fig.2-2).
80
2
2Intermediate piece
80 Nameplate
Fig.2-2: Valve nameplate
2.2 Actuator nameplate
See associated actuator documentation.
2.3 Material identication
number
The seat and plug of the valves have an item
number written on them. You can contact us
stating this item number to nd out which
material is used. Additionally, a seat code is
used to identify the trim material. This seat
code is specied on the nameplate.
2.4 Optional RFID tag
The RFID tag is located directly next to the
nameplate on valves ordered with the RFID
tag option. It contains the same data as in-
cluded in the Data Matrix code on the elec-
tronic nameplate. It can be read using a
smartphone, tablet or RFID reader.
Application range according to the technical
data (see the 'Design and principle of opera-
tion' section).

EB 8046 EN 3-1
Design and principle of operation
3 Design and principle of oper-
ation
The Type3246 is available in three different
versions:
− Globe valve, Class150 and 300/PN16
and 40 (see Fig.3-1)
− Globe valve, Class600 and 900/
PN100 and 160 (see Fig.3-3)
− Three-way valve, Class150 and 300/
PN16 and 40 (see Fig.3-2)
The Type3246 Valve is preferably combined
with a SAMSON Type3271 or Type3277
Pneumatic Actuator. It can also be combined
with other actuators.
The springs in the pneumatic actuator are lo-
cated either above or below the diaphragm
depending on the selected fail-safe action
(see section3.1). A change in the signal
pressure acting on the diaphragm causes the
plug to move. The actuator size is deter-
mined by the diaphragm area.
Globe valves
The seat (4) and plug (5) are installed in the
body (1). For low pressure ratings
(Class150 and 300/PN16 and 40), the
plug is screwed to a plug stem extension
(25). For Class600/PN100 and higher, the
plug and plug stem are incorporated in one
piece. The stem connector clamps connect
the actuator stem of the mounted actuator.
The plug stem or plug stem extension is
sealed by a spring-loaded V-ring packing
(15).
The medium ows through the valve in the
direction indicated by the arrow. A rise in
signal pressure causes the force acting on
the diaphragm in the actuator to increase.
The springs are compressed. Depending on
the selected direction of action, the actuator
stem retracts or extends. As a result, the plug
position in the seat changes and determines
the ow rate through the valve.
Three-way valve
Two seats (4, 141) are installed in the body
(1) of the three-way valve. Depending on the
version, the three-way valve can be used ei-
ther as a mixing or diverting valve.
In mixing valves, the process media to be
mixed enter at valve ports A and B. The
combined ow exits the valve at port AB.
The ow rate from ports A or B to AB de-
pends on the cross-sectional area of ow be-
tween the seats and plugs. Fig.3-2 shows a
mixing valve.
In diverting valves, the process medium en-
ters at the valve port AB and the partial
ows exit at ports A and B.
The design of the mixing and diverting
valves in sizes NPS½ to 1 (DN15 to 25) is
identical.
Insulating section and circulation inhibitor
To withstand low temperatures, the
Type3246 Valve is always tted with a long
insulating section (21). A circulation inhibitor
(86) is installed in the lower section of the in-
sulating section of all three versions. This
prevents the cold process medium from circu-
lating in the insulating section.
Note

3-2 EB 8046 EN
Design and principle of operation
1 Body
2 Intermediate piece
4 Seat
5 Plug
8 Threaded bushing (pack-
ing nut)
9 Stem connector nut
10 Lock nut
14 Nuts
15 Packing
17 Body gasket
21 Insulating section
25 Plug stem extension
32 Bolt
33 Nut
39 Gasket (at the
intermediate piece)
86 Circulation inhibitor
87 Threaded bushing (at the
circulation inhibitor)
141 Bottom seat
Fig.3-1: Type3246 Globe Valve with welding ends,
Class150 and 300/PN16 and 40
17
5
4
1
14
86
30
21
15
29
10
8
25
32
33 39
87
17
1
141
4
5
30
14
B
AB A
86
•
•
•
•
•
Fig.3-2: Type3246 Three-way Valve with anges

EB 8046 EN 3-3
Design and principle of operation
Fig.3-3: Type3246 Globe Valve,
Class600 and 900/
PN100 and 160
4
5
17
14
15
21
3
9
10
8
92
1
86
87
1 Body
3Yoke
4 Seat
5 Plug
8 Threaded bushing (packing nut)
9 Stem connector nut
10 Lock nut
14 Body nut
15 Packing
17 Body gasket
21 Insulating section
86 Circulation inhibitor
87 Threaded bushing (circulation inhibitor)
92 Castellated nut

3-4 EB 8046 EN
Design and principle of operation
We recommend the use of positioners with
integrated diagnostic rmware (see sec-
tion3.4) for valves used for on/off service.
The partial stroke test included in this soft-
ware helps prevent a shut-off valve normally
in its end position from seizing up or getting
jammed.
3.1 Fail-safe positions
The fail-safe position of the control valve up-
on air supply or control signal failure de-
pends on the valve version (globe valve or
three-way valve) and actuator used (see as-
sociated actuator documentation).
3.1.1 Globe valve
Depending on how the compression springs
are arranged in the pneumatic actuator, the
valve has two different fail-safe positions:
− Actuator stem extends (FA)
When the signal pressure is reduced or
the air supply fails, the springs move the
actuator stem downward and close the
valve. The valve opens when the signal
pressure is increased enough to over-
come the force exerted by the springs.
− Actuator stem retracts (FE)
When the signal pressure is reduced or
the air supply fails, the springs move the
actuator stem upwards and open the
valve. The valve closes when the signal
pressure is increased enough to over-
come the force exerted by the springs.
The actuator's direction of action can be re-
versed, if required. Refer to the mounting
and operating instructions of the pneumatic
actuator:
uEB8310-X for Type3271 and Type3277
3.1.2 Three-way valve
Depending on how the compression springs
are arranged in the pneumatic actuator, the
valve has two different fail-safe positions:
Actuator stem extends (FA)
When the signal pressure is reduced or the
air supply fails, the springs cause port B
(mixing valves) or port A (diverting valves) to
close. The port B or A opens when the signal
pressure is increased enough to overcome
the force exerted by the springs.
Actuator stem retracts (FE)
When the signal pressure is reduced or the
air supply fails, the springs cause port B
(mixing valves) or port A (diverting valves) to
open. The port B or A closes when the signal
pressure is increased enough to overcome
the force exerted by the springs.
3.2 Versions
Angle valve
The Type3246 Valve is also available as an
angle valve (special version) on request.
Tip Tip