Emerson KEYSTONE FIGURE 738 Manual

M8 x 1.25 9 (80)
M10 x 1.25 17 (150)
M12 x 1.75 25 (222)
M16 x 1.50 55 (485)
M20 x 1.50 70 (620 )
KEYSTONE PNEUMATIC ACTUATORS
FIGURE 738
Repair and maintenance instructions for F738 cylinders
DISSASSEMBLY INSTRUCTIONS
1. Remove the pneumatic cylinder from the valve.
2. Ensure the cylinder is in a clean
environment.
Actuator identification
3. Identify construction of cylinder model.
There are two types of Keystone pneumatic
cylinder:
a. Tie rod type - identifiable by external tie
rods.
b.
Screwed end type - no external tie rods.
The enclosed seal kit has seals to suit both
types of cylinder. Discard unsuitable seals.
Double acting actuator
4. Dismantle the cylinder - if it is a tie rod style,
remove the tie rodnuts. If it is a screwed
style, unscrew the end covers.
SAFETY PRECAUTIONS
When an actuator is being installed or removed
from service, ensure all pneumatic and electrical
lines are isolated prior to commencing work.
NOTE
Use caution with spring return actuators as the
cylinder will return to its failed position when the air
supply is turned off or disconnected.
TORQUE TABLE
Tie rod thread Torque Nm (lbs)
© 2017 Emerson. All Rights Reserved.Emerson.com/FinalControl VCIOM-02866-EN 17/11
NOTE
The piston and rod assembly do not normally require
dismantling. Check the condition of rod and barrel.
Replace if scored or damaged.
Spring return actuator
WARNING
Spring return cylinders contain potential energy
due to spring compression.
Emerson advises spring return cylinders are
returned to the factory for repair and maintenance.
Incorrect removal of head or end cap of spring
cylinder may result in injury or death.
NOTE
Remove all traces of solvents or detergents before
reassembly.
5. Select the appropriate seal kit for the
actuator model you have.
- Rod seal diameter varies for P3 cylinder
only (100 bore).
- Barrel o-rings are smaller section for
screwed end type pneumatic cylinder.
6. Lightly grease new seals with Castrol LMM
or equivalent.
7. Reassemble pneumatic cylinder in reverse
order of dismantling.
Take care not to damage threads, or to
pinch or damage seals.
8. For tie rod type pneumatic cylinder, fit tie
rod washers and nuts, then progressively
tighten the nuts on opposite sides.
Tightento the required torque as per the
table below.
For screwed endcap style pneumatic
cylinder, ensure threads are thoroughly
cleaned with minimal lubrication. Use a pin
spanner to assist fitting the end caps to the
barrel and ensure the ports are aligned.
9. Refit pneumatic cylinder to valve and
reconnect air supply, avoiding ingress of any
contamination into ports.
10. Slowly stroke the actuator to ensure correct
alignment and operation.
NOTE
To minimize risk to personnel, Emerson recommend
the use of purpose built guards and shrouds.
Refer to the Emerson data sheet or consult factory
for details.

2
1
7
3
5
4
2
7
6
8
9
10
11
1
2
3
4
5
6
7
8
9
10
11
12
13
14
1
7
3
5
4
2
7
6
8
9
10
11
1
2
3
4
5
6
7
8
9
10
11
12
13
14
KEYSTONE PNEUMATIC ACTUATORS
FIGURE 738
PARTS LIST SIZES P1-P6
No. Description Material
1End cap Anodized aluminium
2Barrel* Aluminium alloy
3Piston Aluminium
4Piston seal Nitrile
5Piston wear ring Carbon filled PTFE
6Piston rod seal Nitrile
7Barrel seal Nitrile
8Head cap Anodized aluminium
9Piston rod 316 S/S
10 Clevis pin 304 S/S
11 Rod bearing Sintered bronze
PARTS LIST SIZES P7-P17
No. Description Material
1End cap Carbon steel
2Tie rod Carbon steel
3Barrel Filament wound
Glass epoxy
4Piston Carbon steel
5Piston rod seal upper Nitrile
6Piston wear ring Carbon filled PTFE
7Piston seal Nitrile
8Piston rod seal lower Nitrile
9Piston rod bushing Sintered bronze or PTFE/lead/bronze
10 Head cap Carbon steel
11 Piston rod 316 S/S
12 Clevis 304 S/S
13 Clevis fasteners 304 S/S
14 Piston rod scraper seal Nitrile
NOTE
* Aluminium alloy barrels are standard up to and including size P6 actuators.
Glass epoxy composite is standard thereafter.
NOTE
When ordering retro-fit cylinders for sizes P7 to P17 for a Keystone knife gate valve, a different bridge piece may
be required, consult factory.
Note: New style F738 sizes P1-P6 illustrated.
Note: New style F738 sizes P7-P17 illustrated.
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Responsibility for proper selection, use, and maintenance of any product remains solely with the purchaser and end user.
Keystone is a mark owned by one of the companies in the Emerson Automation Solutions business unit of Emerson Electric Co. Emerson Automation Solutions, Emerson
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