Flowserve 2 Series P5 User Manual

1

Flow Control Division

Kammer Control Valves

Installation, Operation, Maintenance Instructions

Pneumatic Diaphragm On-Off Actuators

Series 2, Type: P5

1 USING KÄMMER VALVES AND ACTUATORS COR-

RECTLY

1.1 General

The following instructions are designed to assist in

unpacking, installing and performing maintenance as
required on Kämmer products. Product users and
maintenance personnel should thoroughly review this
bulletin prior to installing, operating or performing any
maintenance.

DANGER: In most cases Kämmer valves and actuators

are designed for specifi c applications (e.g. with regard
to medium, pressure, temperature). For this reason
they should not be used in other applications without
fi rst contacting the manufacturer.

1.2 Terms concerning safety

The safety terms DANGER, WARNING, CAUTION

and NOTE are used in these instructions to highlight
particular dangers and/or to provide additional
information on aspects that may not be readily
apparent.

DANGER: indicates that death, severe personal injury

and/or substantial property damage will occur if proper
precautions are not taken.

WARNING: indicates that death, severe personal injury

and/or substantial property damage can occur if proper
precautions are not taken.

CAUTION: indicates that minor personal injury and/or

property damage can occur if proper precautions are
not taken.

NOTE: indicates and provides additional technical

information, which may not be very obvious even
to qualified personnel. Compliance with other,
not particularly emphasised notes, with regard to
transport, assembly, operation and maintenance and
with regard to technical documentation (e.g. in the
operating instruction, product documentation or on
the product itself) is essential, in order to avoid faults,
which in themselves might directly or indirectly cause
severe personal injury or property damage.

1.3 Protective clothing

Kämmer products are often used in problematic

applications (e.g. extremely high pressures, dang­erous, toxic or corrosive mediums). In particular
valves with bellows seals point to such applications.
When performing service, inspection or repair
operations always ensure, that the valve and actuator
are depressurised and that the valve has been cleaned
and is free from harmful substances. In such cases pay
particular attention to personal protection (protective
clothing, gloves, glasses etc.).

1.4 Qualifi ed personnel

Qualifi ed personnel are people who, on account of

their training, experience and instruction and their
knowledge of relevant standards, specifications,
accident prevention regulations and operating
conditions, have been authorised by those responsible
for the safety of the plant to perform the necessary
work and who can recognise and avoid possible
dangers.

1.5 Installation

DANGER: Before installation check the order-no, serial-

no. and/or the tag-no. to ensure that the valve/actuator
is correct for the intended application.

Do not insulate extensions that are provided for hot

or cold services.

Pipelines must be correctly aligned to ensure that the

valve is not fi tted under tension.

STOP!

KMEIM0008-00 04.04

Index

1 Using Kämmer valves and actuators correctly.
2 Unpacking
3 Installation
4 Quick check
5 Maintenance
6 Remove and install actuator
7 Reverse actuator action
8 Disassemble and assemble actuator
9 Troubleshooting chart

2

Flow Control Division

Kammer Control Valves

2 UNPACKING

2.1 Each delivery includes a packing slip. When unpacking,
check all delivered valves and accessories using this
packing slip.

2.2 Larger valves can be lifted using slings on the yoke rods
or, if present, on the lugs provided for this purpose. If
slings are used, attach them so that the outer tubing
or attaching parts are not damaged.

WARNING: If slings are used, be aware that the centre

of gravity of the valve may be above the lifting point. In
this case, secure or support the valve against rotating,
to prevent damage or personnel injury.

2.3 Report transport damage to the carrier immediately.

2.4 In case of discrepancies, contact your nearest
FLOWSERVE sales office.

3 INSTALLATION

3.1 Clean tubing prior to installing.

3.2 If possible, install the valve in an upright position
(actuator on top), to ease maintenance. An upright
installation position is important with low-temperature
applications, in order to keep the distance between
the packing material and the medium as large as pos­sible. The packing material then retains the ambient
temperature as much as possible.

NOTE: Do not insulate extension bonnets that are

provided for hot or cold services

3.3 Make sure that sufficient overhead clearance above
the actuator is maintained, to allow for disassembly
of plug from the valve body (see following table).

3.4 After installing, check direction of flow again. The
direction of flow is shown by the arrow on the hous­ing.

3.5 If the valve is to be welded into the line, make sure
that the valve is shielded from excessive heat.

3.6 Connect supply pressure and signal lines. Control
valves are supplied with a positioner. The end connec­tions for supply pressure and signal are clearly marked.
Series 4 actuators and positioners are suitable for max.

4.2 bar (60 psi) supply pressure. If the supply pressure
exceeds the pressure specified on the nameplate, a
pressure reducing station is required. If instrument
air is not available, install an oil separator/air filter in
the air inlet line. All connections must be leak free.

Actuator Clearance Actuator Clearance
size (mm) size (mm)

37/47 95 P2 140
38/48 140 P3 140
39/49 140 P4 140
39D/49D 140 P5 140

1.6 Spare parts

Use only Kämmer original spare parts. Kämmer cannot

accept responsibility for any damages that occur from
using spare parts or fastening materials from other
manufactures. If Kämmer products (especially sealing
materials) have been on store for longer periods check
these for corrosion or deterior-ation before using these
products. Fire protection for Kämmer products must
be provided by the end user.

1.7 Service / repair

To avoid possible injury to personnel or damage to

products, safety terms must be strictly adhered to.
Modifying this product, substituting nonfactory parts,
or using maintenance procedures other than outlined
in this instruction could drastically affect performance
and be hazardous to personnel and equipment, and
may void existing warranties. Between actuator and
valve there are moving parts. To avoid injury Flowserve
provides pinch-point-protection in the form of cover
plates, especially where side-mounted positioners
are fitted. If these plates are removed for inspection,
service or repair special attention is required. After
completing work the cover plates must be refitted.

Apart from the operating instructions and the

obligatory accident prevention directives valid in the
country of use, all recognised regulations for safety
and good engineering practices must be followed.

WARNING: Before products are returned to Kämmer

for repair or service Kämmer must be provided with
a certificate which confirms that the product has been
decontaminated and is clean. Kämmer will not accept
deliveries if a certificate has not been provided (a form
can be obtained from Kämmer).

1.8 Storage

In most cases Kämmer Products are manufactured

from stainless steel. Products not manufactured
from stainless steel are provided with an epoxy resin
coating. This means that Kämmer products are well
protected from corrosion. Nevertheless, Kämmer
products must be stored adequately in a clean, dry
environment. Plastic caps are fitted to protect the
flange faces and to prevent the ingress of foreign
materials. These caps should not be removed until
the valve is actually mounted into the system.

1.9 Valve and actuator variations

These instructions cannot claim to cover all details of

all possible product variations, nor in particular can
they provide information for every possible example of
installation, operation or maintenance. This means that
the instructions normally include only the directions to
be followed by qualified personal where the product
is being used for is defined purpose. If there are any
uncertainties in this respect particularly in the event
of missing product-related information, clarification
must be obtained via the appropriate FLOWSERVE
sales office.

STOP!

STOP!

3

Flow Control Division

Kammer Control Valves

4 QUICK CHECK

Before operating, check the valve as follows:

4.1 Open and close the valve, and observe the movement
of the actuator stem. The movement must be smooth
and linear.

4.2 Check for maximum stroke through change of signal
(for pneumatic positioners, 0.2 - 1.0 bar or correspond­ing split-range values; for IP positioners, 4-20 or 0-20
mA).

4.3 Check all air connections for leaks.

4.4 Tighten packing nut (see table 1).

NOTE: An excessively tightened gland nut can cause

excessive packing wear and can hinder the free move­ment of the plug stem.

4.5 Check fail-safe position. To do this, close supply pres­sure and observe whether the valve opens or closes
as defined.

4.6 After use at fluctuating temperatures, re-tighten all bolt
connections and check for leaks.

5 MAINTENANCE

Check valves for correct functioning at regular intervals

(at least once every 6 months) as follows. This check
can be made when installed and in many cases
without interrupting production. If internal defects are
suspected, see section „Disassembly and Assembly of
Valve“.

5.1 Examine gaskets for leaks and if necessary re-tighten
bolts (see Fig. 1).

5.2 Check bellows gasket and test connection - if present

- for external leaks.

5.3 Check valve for damage caused by corrosive residues
or corrosive vapours.

5.4 Clean valves and repaint as necessary.

Warning: To prevent a buildup of electrostatic charge

clean the actuator/valve with a damp cloth only.

5.5 Check gland nut for correct torque (see table 1).

NOTE: An excessively tightened gland nut can cause

excessive packing wear and can hinder the free move­ment of the plug stem.

5.6 If possible, open and close valve and check for maxi­mum stroke and smooth movement of the plug stem.
Irregular movement of the plug stem may indicate
internal defects.

NOTE: With graphite packing, irregular movement of

the plug stem is normal.

WARNING: Keep hands, hair, clothing, etc. away from

all moving parts. Failure to do so can lead to serious
injury.

5.7 Check all accessories for firm seating.

5.8 If possible, close supply pressure and check the fail­safe position.

5.9 Check stem boot for wear.

5.10 Check actuator for leaks. To do this, spray housing,
air connections and plug stem guide with leak spray
and check for any bubble formation.

5.11 Clean plug stem.

5.12 Check air filter, if present, and if necessary replace
insert.

Note: For further information regarding service and

maintenance please contact your nearest FLOWSERVE
office.

Table 1

STOP!

STOP!

Torque Nm
Thread PTFE Grafoil

M20 x 1,5 1 3
M30 x 1,5 6 15
M38 x 1,5 15 35
M45 x 1,5 17 40

4

Flow Control Division

Kammer Control Valves

21

20
7

23

22

24

25

26

27

37

28

29

31

1

34

9

35

17
18

32

36

7

23

2

33

2

24
25

26

27

37

28

6

7

21

20

17

6

30

5
3
5

17

18

32

19

29

31

1
2
3
4
5
2

6

7

8
9

10

11

12
13

14

15

16

Fig. 1: Series 5 On-Off Actuator, Air-to-Open

5

Flow Control Division

Kammer Control Valves

1 A 30 00 90 05 Washer
2 A AG 01 25 ID Bushing
3 A AG 00 25 UL O-Ring 22 x 2
4 A 30 00 80 00 Guide
5 A AG 00 35 NB O-Ring 32,99 x 2,62
6 A 60 00 30 01 Lower body
7 A 60 00 50 01 Flange
8 A PS 03 28 05 Yoke plate
9 0 10 03 89 A2 Nut M 38 x 1,5
10 A 60 01 35 05 Actuator stem
11 A PS 03 70 05 Yoke rod
12 A AG 05 10 81 Coupling half.
13 A AG 05 30 A2 Screw
14 A AG 05 70 05 Coupling insert
15 0 10 03 36 A2 Nut, M10
16 A PS 01 02 05 Yoke plate
17 0 10 00 34 A2 Washer, Ø 6,4
18 0 10 03 34 A2 Nut, M 6
19 0 36 01 80 00 Travel indicator, assy.

20 0 10 02 24 A2 Screw M 6 x 30
21 0 10 02 31 A2 Screw M 6 x 110
22 A 60 00 20 01 Upper body
23 0 36 06 00 PA Vent plug
24 0 10 00 69 A2 Nut, M 16
25 A 60 01 02 AP Spacer
26 A 60 00 75 01 Plate
27 A 60 00 70 01 Spring plate
28 A 60 00 71 01 Spring plate
29 A 60 00 60 01 Piston
30 A AG 06 03 Al E Sticker
31 A 60 00 10 EC Diaphragm
32 A 60 00 86 71 Nut M 6 x 95
33 A 60 00 98 05 Guide
34 A 60 01 51 05 Actuator stem
35 A 60 00 94 05 Spacer ring
36 A 60 00 95 05 Intermediate ring
37* – Spring set

* Do not change the spring set thrust or increase the air
supply pressure without first consulting the manufacturer.

Service to the actuator is best performed when the actuator is removed from the valve body. For the purpose of these instructions, consider the

actuator as a separate subassembly with the procedures described in these instructions being performed on a bench. However, many service
repairs and adjustments can be accomplished in the field while the actuator and valve body are still connected to each other.

6 REMOVING AND INSTALL ACTUATOR

6.1 REMOVING ACTUATOR
(refer to Fig. 1)

6.1.1 Shut off air supply.
WARNING: Depressurise the line to atmospheric pressure

and drain all fluids from the valve before working on the
actuator. Failure to do so can cause serious injury.

6.1.2 Disconnect all tubing.

6.1.3 Remove 2 screws (13) and remove coupling (12).

6.1.4 Remove yoke rod retaining nuts (15) and lift actuator
assembly from the valve.

6.1.5 Remove coupling insert (14) and it’s locknut from plug
stem.

NOTE: Ensure that the plug assembly is not rotated with

the plug seated. This may cause irreparable damage to the
seating faces.

6.2 INSTALL ACTUATOR

(refer to Fig. 1)

The actuator stem must be fully extended:
Actuators with air-to-open action must be fully vented.

Actuators with air-to-close action apply supply pressure.

Manually depress the plug stem to ensure the plug is fully

seated.

6.2.1 Screw coupling insert locknut and coupling insert as far as
possible onto plug stem.

6.2.2 Place the actuator assembly on the valve engaging the yoke
rod threads in the lower yoke plate and ensuring the actuator
faces in the correct direction.

6.2.3 Unscrew the coupling insert until the yoke rods are raised
from the lower yoke plate by around 2 mm.

NOTE: Ensure that the plug assembly is not rotated with

the plug seated. This may cause irreparable damage to the
seating faces.

6.2.4 Refit the coupling (12), ensuring
that the arrows, embossed on the
coupling halves, point upward
towards the actuator, and secure with
2 retaining screws (13).

6.2.5 Apply supply pressure resp. vent actuator to half stroke and
refit and tighten yoke rod retaining nuts (15).

6.2.6 Connect all tubing.

7 REVERSE THE ACTUATOR ACTION
(refer Fig. 1)
DANGER: Actuators with “spring-to-close” action

can be disassembled and reassembled by using long
(de)compression screws. A suitable press is required to
disassembled and reassemble actuators with “spring-to­open” action or to reverse the actuator action.

7.1 Reverse actuator action from spring-to-close to spring­to-open

7.1.1 As required remove the actuator from the valve as described
in section 1.1.

7.1.2 If long (de)compression screws are not already fitted to the
actuator: remove 4 equally spaced case retaining screws
(20).

STOP!

NOTE: The trim is a very vunerable. Great care must be taken to prevent
damage to the pug and seat facings.

The upper yoke plate (8) and the yoke rods (11) are always removed and replaced with the actuator.

6

Flow Control Division

Kammer Control Valves

7.2.8 Replace the parts in reverse order.

7.2.9 Secure the actuator stem (10) from rotating with a wrench
across the flats on the stem’s lower part and torque the nut
(32) to 35 Nm. Replace and tighten the actuator stem (34)
and secure with loctite 221.

7.2.10 Release the press and replace the upper case half.

7.2.11 Insert 4 x 110 mm long (de)compression screws (21)
through the upper and lower actuator case halves and tighten
with long nuts (31) in equal measures until the casing halves
contact.

7.2.12 Insert and tighten all remaining short case retaining screws
(20) in equal measures to a torque value of 12 Nm.

7.2.13 Assemble the upper actuator as described in sections 7.2.8
to 7.2.11.

7.2.14 Secure the actuator stem (34) from rotating with a wrench
across the flats on the stem’s lower part and torque the nut
(24) to 35 Nm. Replace locknut (24) and secure with loctite

221.

7.2.15 Replace upper body

7.2.16 Insert and tighten the upper case retaining screws (20) in
equal measures to a torque value of 12 Nm.

7.2.17 As required refit the actuator assembly to the valve as
described in 1.2.

8 DISASSEMBLE AND ASSEMBLE ACTUATOR
(refer to fig. 1)
DANGER: Actuators with “spring-to-close” action can be

disassembled and reassembled by using a press or long
(de)compression screws. A suitable press is required to
disassembled and reassemble actuators with “spring-to­open” action or to reverse the actuator action.

8.1 DISASSEMBLE ACTUATOR

8.1.1 Actuator action spring-to-close

8.1.1.1 As required remove the actuator from the valve as described
in section 1.1.

8.1.1.2 If long (de)compression screws are not already fitted to the
actuator: remove 4 equally spaced case retaining screws
(20).

8.1.1.3 Insert 4 x 110 mm long (de)compression screws (21) and
tighten the nuts hand tight.

8.1.1.4 Remove all the remaining short case retaining screws
(20).

8.1.1.5 Unscrew the long compression screws (21) in equal
measures until the actuator springs are fully decompressed
and the upper case is loose.

8.1.1.6 Remove the upper case half.

8.1.1.7 Secure the actuator stem (34) against rotating with a wrench
across the flats on the stem’s lower part and remove the lock
nuts (24).

8.1.1.8 Remove following parts:

spacer (25), plate (26), spring plate (27), spring set (37),

piston (29), spring plate (28), diaphragm (31) and washer (1)

8.1.1.9 Disassemble the lower actuator as described in sections

8.1.1.3 to 8.1.1.8.

8.1.1.10 With a hooked spanner loosen and remove the slotted nut
(9).

8.1.1.11 Remove the guide (4) and upper yoke plate (8).

7.1.3 Insert 4 x 110 mm long (de)compression screws (21) and
tighten the nuts hand tight.

7.1.4 Remove all the remaining short case retaining screws
(20).

7.1.5 Unscrew the long compression screws (21) in equal
measures until the actuator springs are fully decompressed
and the upper case is loose.

7.1.6 Remove the upper case half.

7.1.7 Secure the actuator stem (34) against rotating with a wrench
across the flats on the stem’s lower part and remove the lock
nuts (24).

7.1.8 Remove following parts:

spacer (25), plate (26), spring plate (27), spring set (37),

spring plate (28), piston (29) diaphragm (31) and washer
(1)

NOTE: It is not necessary to remove the nut (9). The body

halves (6) with spacer ring (35) and intermediate ring (36)
can be removed as an assembly.

7.1.9 Disassemble the lower actuator assembly as described in
sections 7.1.2 to 7.1.8.

7.1.10 Replace the parts in reverse order.

7.1.11 With a suitable press compress the spring set.

7.1.12 Secure the actuator stem (10) from rotating with a wrench
across the flats on the stem’s lower part and torque the nut
(24) to 35 Nm. Replace and tighten the actuator stem (34)
and secure with loctite 221.

7.1.13 Replace the upper case half.

7.1.14 Insert and tighten the upper case retaining screws (20) in
equal measures to a torque value of 12 Nm.

7.1.15 Assemble the upper actuator as described in sections 7.1.10
to 7.1.12.

7.1.16 Secure the actuator stem (34) from rotating with a wrench
across the flats on the stem’s lower part and torque the nut
(24) to 35 Nm. Replace locknut (24) and secure with loctite

221.

7.1.17 Replace the upper case half.

7.1.18 Insert and tighten the upper case retaining screws (20) in
equal measures to a torque value of 12 Nm.

7.1.19 As required refit the actuator assembly to the valve as
described in section 1.2.

7.2 Reverse actuator action from spring-to-open to spring-to­close

7.2.1 As required remove the actuator from the valve as described
in section 1.1.

7.2.2 Remove all case retaining screws (20).

7.2.3 Remove the upper case half (22).

7.2.4 With a suitable press compress the spring set.

7.2.5 Secure the actuator stem (34) against rotating with a wrench
across the flats on the stem’s lower part and remove the lock
nuts (24).

7.2.6 Remove following parts:

washer (1), diaphragm (31), piston (29), spring plate

(28), spring set (37), spring plate (27), plate (26) and
spacer (25).

NOTE: It is not necessary to remove the nut (9). The body

halves (6) with spacer ring (35) and intermediate ring (36)
can be removed as an assembly.

7.2.7 Disassemble the lower actuator as described in sections

7.2.2 to 7.2.6.

7

Flow Control Division

Kammer Control Valves

8.1.2 Actuator action spring-to-open

8.1.2.1 As required remove the actuator from the valve as described
in section 1.1.

8.1.2.2 Remove all case retaining screws (20).

8.1.2.3 Remove the upper case half (22).

8.1.2.4 With a suitable press compress the spring set.

8.1.2.5 Secure the actuator stem (34) against rotating with a wrench
across the flats on the stem’s lower part and remove the lock
nuts (24).

8.1.2.6 Remove following parts:

washer (1), diaphragm (31), piston (29), spring plate (28),

spring set (37), spring plate (27), plate (26) and spacer
(25).

8.1.2.7 Disassemble the lower actuator as described in sections

8.1.2.2 to 8.1.2.6.

8.1.2.8 With a hooked spanner loosen and remove the slotted nut
(9).

8.1.2.9 Remove the guide (4) and upper yoke plate (8).

8.2 ASSEMBLE ACTUATOR

(refer to Figs. 1 and 2)

8.2.1 Actuator action spring-to-close

8.2.1.1 Insert the guide (4) into the lower body half.

8.2.1.2 Replace the upper yoke plate ensuring that the nose in the
lower body rests in the bore of the upper yoke plate (see
fig. 2).

8.2.1.3 Refit the slotted nut (9) and tighten with a hooked spanner.

8.2.1.4 Refit the actuator stem (10), washer (1), diaphragm (31),
piston (29), spring plate (28), spring set (37), spring plate
(27), plate (26) and spacer (25)

8.2.1.5 Secure the actuator stem (10) from rotating with a wrench
across the flats on the stem’s lower part and torque the nut
(24) to 35 Nm. Replace and tighten actuator stem (34) and
secure with loctite 221.

8.2.1.6 Replace the upper case half.

8.2.1.7 Insert 4 x 100 mm long (de)compression screws (21) through
the upper and lower actuator case halves and tighten with
long nuts (31) in equal measures until the casing halves
contact.

8.2.1.8 Insert and tighten all remaining short case retaining screws
(20) to a torque value of 12 Nm.

8.2.1.9 Assemble the upper actuator as described in sections

8.2.1.4 to 8.2.1.8.

8.2.1.10 Secure the actuator stem (34) from rotating with a wrench
across the flats on the stem’s lower part and torque the nut
(24) to 35 Nm. Replace locknut (24) and secure with loctite

221.

8.2.1.11 Replace the upper case half.

8.2.1.12 Insert and tighten the upper case retaining screws (20) in
equal measures to a torque value of 12 Nm.

8.2.1.13 As required refit the actuator assembly to the valve as
described in section 1.2.

8.2.2 Actuator action spring-to-close

8.2.2.1 Insert the guide (4) into the lower body half.

8.2.2.2 Replace the upper yoke plate ensuring that the nose in the
lower body rests in the bore of the upper yoke plate (see
fig. 2).

8.2.2.3 Refit the slotted nut (9) and tighten with a hooked span­ner.

8.2.2.4 Refit the actuator stem (10), spacer (25), plate (26),
spring plate (27), spring set (37), spring plate (28), piston
(29), diaphragm (29) and washer (1).

8.2.2.5 With a suitable press compress the spring set.

8.2.2.6 Secure the actuator stem (10) from rotating with a wrench
across the flats on the stem’s lower part and torque the nut
(24) to 35 Nm. Replace and tighten actuator stem (34) and
secure with loctite 221.

8.2.2.7 Release the press and replace the upper case half.

8.2.2.8 Insert and tighten the case retaining screws (20) in equal
measures to a torque value of 12 Nm.

8.2.2.9 Assemble the upper actuator as described in sections

8.2.2.4 to 8.2.2.8.

8.2.2.10 Secure the actuator stem (34) from rotating with a wrench
across the flats on the stem’s lower part and torque the nut
(24) to 35 Nm. Replace and tighten locknut (24) and secure
with loctite 221.

8.2.2.11 Release the press and replace the upper case half.

8.2.2.12 Insert and tighten the case retaining screws (20) in equal
measures to a torque value of 12 Nm.

8.2.2.13 As required refit the actuator assembly to the valve as
described in section 1.2.

Fig. 2: Anti-rotation device

8.3 NAMUR ACCESSORIES

(see Fig. 3)

8.3.1 Accessories according to NAMUR can be fitted by

flanging them to the yoke. A special coupling half with
threaded bosses is available to connect the actuating
lever (see spare parts list for part-no.).

Fig. 3: NAMUR coupling half

8

Flow Control Division

Kammer Control Valves

All data subject to change without notice

©04.2004 Flowserve Corporation. Flowserve and Kämmer are trademarks of Flowserve Corporation

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Flowserve Eastern Europe

12, av. du Québec
91965, Courtaboeuf Cedex
France
Telephone: [phone]
Facsimile: [phone]

9 Troubleshooting chart

Problem Possible cause Corrective Action
Stem pulsates 1. Unstable air supply 2. Adjust air supply

2. Vent or passage blocked 3. Clean vent or passage
Actuator slow 1. Air supply too low 1. Adjust air supply

2. Diaphram case leaks air 2. Seal diaphram case

3. Spring case vent blocked 3. Renew vent
Actuator will not 1. Air supply too low 1. Adjust air supply

return to end 2. Broken actuator spring 2. Renew all actuator springs
position 3. Actuator movement blocked 3. Dissassemble actuator and check

Actuator will not 1. Actuator not vented 1. Vent actuator
return to the 2. Broken actuator spring 2. Renew all actuator springs
failsafe position 3. Actuator movement blocked 3. Dissassemble actuator and check