Clarkson Manuals: Knife Gate Valves Figure 738 Repair Instructions, Clarkson-EN Manuals & Guides
CLARKSON 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 Clarkson 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.
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.
8. For tie rod type pneumatic cylinder, fit tie
rod washers and nuts, then progressively
tighten the nuts on opposite sides.
Tightento 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.
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)
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 )
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.
© 2017 Emerson. All Rights Reserved.Emerson.com/FinalControl VCIOM-02866-EN 19/09
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KEYSTONE PNEUMATIC ACTUATORS
FIGURE 738
PARTS LIST SIZES P1-P6
No. Description Material
1 End cap Anodized aluminium
2 Barrel* Aluminium alloy
3 Piston Aluminium
4 Piston seal Nitrile
5 Piston wear ring Carbon filled PTFE
6 Piston rod seal Nitrile
7 Barrel seal Nitrile
8 Head cap Anodized aluminium
9 Piston rod 316 S/S
10 Clevis pin 304 S/S
11 Rod bearing Sintered bronze
NOTE
* Aluminium alloy barrels are standard up to and including size P6 actuators.
Glass epoxy composite is standard thereafter.
PARTS LIST SIZES P7-P17
No. Description Material
1 End cap Carbon steel
2 Tie rod Carbon steel
3 Barrel Filament wound
Glass epoxy
4 Piston Carbon steel
5 Piston rod seal upper Nitrile
6 Piston wear ring Carbon filled PTFE
7 Piston seal Nitrile
8 Piston rod seal lower Nitrile
9 Piston 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: New style F738 sizes P1-P6 illustrated.
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NOTE
When ordering retro-fit cylinders for sizes P7 to P17 for a Clarkson knife gate valve, a different bridge piece may
be required, consult factory.
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.
Clarkson 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.
Emerson.com/FinalControl
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