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

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.

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)

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.

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.

Neither Emerson, Emerson Automation Solutions, nor any of their affiliated entities assumes responsibility for the selection, use or maintenance of any product.

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

and the Emerson logo are trademarks and service marks of Emerson Electric Co. All other marks are the property of their respective owners.

The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not to be construed

as warranties or guarantees, express or implied, regarding the products or services described herein or their use or applicability. All sales are governed by our terms and

conditions, which are available upon request. We reserve the right to modify or improve the designs or specifications of such products at any time without notice.

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