Tc1324 Mp13 Pneum Piston Act

Operation and Maintenance Manual

MODEL MP 13 Pneumatic Piston Actuator

TC1324

All the information contained in this manual is the exclusive property of Cooper Cameron Corporation, Cameron Willis Division. Any reproduction or use of any of the calculations, drawings, photographs, procedures or instructions, either expressed or implied, is forbidden without written permission of Cooper Cameron Corporation, Cameron Willis Division, or its authorized agent.

Initial Release A1 August 1998 Revision 01 July 2003

Copyright © 2003 all rights reserved by Cooper Cameron Corporation Cameron Willis Division TC1324

2

Preface The information contained in this book was prepared in accordance with American Petroleum Institute Specification 6A, Specification for Wellhead and Christmas Tree Equipment, Section 10.20.7.2.1, Minimum Contents of Manufacturer’s Operating Manual. The procedures included in this book are to be performed in conjunction with the requirements and recommendation outlined in API Specification 6A. Any major repairs to the equipment covered by this book should be done by an authorized Cameron Willis service representative. Cameron Willis will not be responsible for loss or expense resulting from any failure of equipment or any damage to any property or injury or death to any person resulting in whole or in part from repairs done by other than authorized Cameron Willis personnel. Such unauthorized repairs shall also serve to terminate any contractual or other warranty, if any, on the equipment and may also result in the equipment no longer meeting API requirements. File copies of this manual are maintained. Cameron Willis will make revisions and/or additions as deemed necessary. The drawings in this book are not drawn to scale, but the dimensions are accurate.

Cameron Willis 11331 Tanner Road Houston, Texas 77041 713-280-3000

TC1324

3

TC1324

4

Table of Contents I.

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

II.

Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

III.

Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

IV.

Actuator Selection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

V.

Actuator Selection Procedure. . . . . . . . . . . . . . . . . . . . . . . 8

VI.

Operating Pressure Calculations . . . . . . . . . . . . . . . . . . . . . 8

VII.

Actuator Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

VIII.

Actuator Assembly Procedure . . . . . . . . . . . . . . . . . . . . . . 11

IX.

Actuator to Bonnet Installation . . . . . . . . . . . . . . . . . . . . . 18

X.

Service and Repair. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 A. Top Shaft Seal Replacement . . . . . . . . . . . B. Top Shaft Replacement . . . . . . . . . . . . . C. Replacement of Top Cap O-Ring Seal . . . . . . D. Replacement of Piston & Retainer Nut O-Rings.

. . . .

. . . .

. . . .

. . . .

. . . .

. . . .

. . . .

. . . .

. . . .

. . . .

. . . .

23 24 26 27

XI.

Periodic Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

XII.

Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Technical Specifications, Illustrations, and Parts List Illustration . . . . . . . . . . . . . . . . . . . Parts List . . . . . . . . . . . . . . . . . . . . Technical Specifications . . . . . . . . . . . . Physical Dimensions . . . . . . . . . . . . . . Clearance Removal Dimensions. . . . . . . .

TC1324

5

. . . . . .

. . . . . .

. . . . . .

. . . . . .

. . . . . .

. . . . . .

. . . . . .

. . . . . .

. . . . . .

. . . . . .

. . . . . .

. . . . . .

. . . . . .

. . . . . .

32 32 33 34 35 36

I. Operation The pneumatic piston actuator is operated by application of adequate air or gas pressure to the port on the actuator head. Pneumatic pressure on the internal piston will, in turn, force the bonnet stem to either open or close the valve, depending upon whether the valve is direct acting or reverse acting. The proper amount of air supply needed per operation is found in the “Operating Pressure Calculations” chart included in this manual. In a normally closed valve having a pressure differential across the gate, the initial opening or cracking action may be quite rapid as the pressure differential is reduced. This is normal and neither causes damage nor hinders valve function. The remainder of the stroke can be expected to be normal. Upon release of actuator pressure, the closing motion should be smooth and without hesitation, until the valve comes to the end of its travel. This closing action should be smooth, whether or not the actuator is operating a pressured or un-pressured valve, regardless of orientation. This pneumatic actuator incorporates a compression spring for assistance in closing. If the motion is not as described, refer to the “Troubleshooting” section of this manual.

II. Installation An API 6A-Surface Safety Valve (SSV) should be the second valve in the wellhead flow-stream. If two master valves are used, the SSV should be the top master valve, or if a single master valve is used, the SSV should be the wing valve. Other installations are flowlines, header valves, gathering lines, and pipelines. Surface Safety Valves are designed to provide automatic valve shut-in protection where needed. These SSV applications are ideal for oil and gas installations where corrosive (H2S or CO2), abrasive and/or paraffin laden products are produced.

TC1324

6

III. Ordering Information The following information should be provided with any request for quote or order placement for Cameron Willis Actuators: Actuator Model of Actuator Series of Actuator Size of Actuator API 6A Requirements (PSL) SSV Class of Service (PR1 or PR2) Control Fluid Power Well Fluid Power Temperature (API 6A) Location Environment (Onshore/Offshore) Material Class (API 6A) Actuator Control Pressure Availability Special Test Requirements Special Material Requirements Special Coating Requirements Other Specifications and/or Certifications Accessories

IV. Actuator Selection To determine the selection of an actuator, refer to the “Operating Pressure Calculations” chart included in this manual. This chart indicates the correct amount of control supply pressure to successfully operate the actuator against well flowing pressure conditions. It is important to note that higher control supply pressure makes possible the use of smaller size actuators.

TC1324

7

V. Actuator Selection Procedure Determine valve specifications such as size, maximum rated working pressure, expected shut-in pressure, and maximum flowline pressure. If maximum flowline pressure is less than half of the maximum working pressure of the valve, consult Cameron Willis for optimum sizing of the actuator. Determine the available control pressure supply at the wellsite. This is typically air supply pressure or natural gas supply. This supply can be rated up to 250 PSI for Cameron Willis piston actuators.

VI. Operating Pressure Calculations Valve Size

Working Pressure

Formulas

1-13/16”

10,000

(.015 x WP + 6 psi)

2000/3000

(.015 x WP + 6 psi)

5000

(.015 x WP + 5 psi)

10,000

(.015 x WP + 6 psi)

2000/3000

(.018 x WP + 6 psi)

5000

(.018 x WP + 5 psi)

2000/3000

(.025 x WP + 6 psi)

5000

(.025 x WP + 5 psi)

2000/3000

(.040 x WP + 6 psi)

2-1/16”

2-9/16”

3-1/18” 4-1/16”

Note: Formulas above are based on Cameron FL & FLS valves.

TC1324

8

VII. Actuator Accessories A. Non-Electric Accessories Clear Stem Protector

This device protects the top shaft of the actuator from the adverse effects of weather.

Manual Hold Open Device

This device is used to mechanically hold open the actuator and valve. It is typically used on smaller valves or low pressure valves while the valve body is pressurized. This device is used on wellhead trees during installation, and may also be used to stroke small or low pressure valves while the valve body is pressurized.

Hydraulic Override

This device is used to open the valve and actuator independent of the supply circuit.

Fusible Hold Open Device

This device mechanically holds the actuator and valve open during workover or when the safety systems are inoperative. The device locks the actuator in the down (full open) position, allowing it to close only in the event of fire.

Fusible Manual Hold Open Device

This device is used to mechanically hold open the valve in lieu of the actuator. It locks the actuator in the down (full open) position, allowing it to close only in the event of fire. This device is used on wellhead trees during installation, and may also be used to stroke small or low pressure valves while the valve body is pressurized.

TC1324

9

B. Electric Accessories

Electric Limit Switch

An electrical contact permits a remote indication of gate valve position (full open or full closed). The electric limit switch is typically used on large production platforms or automated leases where there is remote monitoring and control of valves.

Continuous Position Indicator

Continuous position indicators operate at low currents. The frequency of their output can be used to provide exact position. Linear displacement transducers are used throughout the range between the open and closed position, to measure the change in frequency.

Proximity Sensor

Proximity sensors sense the linear motion of the valve by detecting the presence of ferrous and non-ferrous metals. They are able to function without the need for physical contact.

Proximity Switch

This magnetically operated switch senses linear motion of the valve, and may function either with or without the need for physical contact.

Pneumatic Limit Switch

The pneumatic limit switch permits a remote indication of gate valve position when electrical supply is not present.

Magnetic Reed Switch

The magnetic reed switch device is activated by a magnetic field. It monitors linear travel of the gate valve. The switches are totally sealed against harsh environments.

TC1324

10

VIII. Actuator Assembly Procedure A. Preparation For Assembly

1. Use an assembly work area with a metallic surface covered with a layer of corrugated cardboard or soft rubber. Ensure that the work area is clean. 2. All grease or lubricants used in assembly should be clean. Clean all utensils such as brushes or applicators of any foreign particles after each use. Do not leave residue in grease or lubrication containers. 3. Ensure that all tools used in assembly are clean and in good working order. 4. Clean all metallic components prior to assembly. 5. Keep all elastomers and plastic base materials in bags or boxes until needed for assembly. Caution: Never use chlorinated solvents to clean O-rings or other seals. 6. Inspect all components for burrs, dings, marks, scrapes, nicks, cuts, or abrasions.

TC1324

11

A. Assembly of Top Cap/Piston/Retainer Nut Sub-Assembly 1. Place the top cap on a flat surface with the top threaded boss up. Apply grease to the through bore and seal bore of the threaded boss. 2. Install seal into top cap.

Caution: The lips of the seal must be facing toward the bottom of the actuator. 3. Install the wiper ring into the seal retainer bore. Caution: The wiper ring lip must point away from the actuator and seal, toward the grooved end of the seal retainer. 4. Install the seal retainer into the bore of the threaded boss, on top of the seal. Push down firmly.

TC1324

12

5. Install the retainer ring into the groove to hold the seal retainer in place. Verify that the retainer ring is fully seated. Grease the seal and seal retainer with grease.

6. Install the large piston O-ring in the top cap OD O-ring groove, grease it lightly and set the top cap subassembly aside. 7. Apply grease to all three retainer nut O-ring seal grooves. Lightly grease two O-rings and install into the I.D. grooves of the retainer nut. Lightly grease an O-ring and install it into the face groove of retainer nut. Set the retainer nut aside.

TC1324

13

8. Place the piston on a flat surface with the lifting eye holes facing upward. Apply an anti-seize compound to the threaded bore of the piston. Install the pre-assembled retainer nut into the threaded bore of the piston by aligning the threads and rotating it in a clockwise manner. Tighten the retainer nut securely. 9. Lightly grease and install the piston O-ring into the upper groove.

Caution: Care should be used during assembly to protect the O-rings and top shaft from damage. Firmly push the top shaft inside the piston, allowing the top shaft to shoulder on the retainer nut. Set the sub-assembly aside. 10. Generously grease the top shaft and insert it slowly from the bottom side of the piston through the retainer nut.

TC1324

14

B. Lower Housing Assembly 1. Place the housing on a flat surface. Lift the lower housing and center it over the housing. Lower the lower housing into the housing.

Caution: The lower housing must shoulder on the housing. A slight tap from a dead-blow hammer may be needed to achieve proper shouldering. 2. Insert the snap ring into the groove of the housing.

Caution: Make sure the snap ring overlaps properly in the groove.

TC1324

15

3. Insert the lock ring into the groove behind the snap ring, and secure it with the 3/8”hex-head bolts. Install vent fittings in lower housing.

4. The lower assembly is now complete. Place the assembly right side up.

D. Assembly of the Piston to the Housing 1. Wipe the inside of the housing to insure that the sealing area is clean. Generously apply grease to the entire bore of the housing. 2. Lift the piston sub-assembly down into the housing, carefully centering the piston and lowering it slowly. A lifting eye (5/8" -11 UNC) may be used in the top shaft to help lift the piston assembly. 3. Keep the piston as level as possible and press it firmly to install it into the housing. A dead-blow hammer may be used softly to drive the piston down into the housing bore.

TC1324

16

E. Final Assembly 1. Generously grease the top shaft with grease. Lift the top cap sub-assembly and center it over the top shaft and housing sub-assembly. Lower it slowly, allowing the top shaft to slide smoothly through the seal. A slow, smooth movement will help protect the seal from damage.

Caution: The top cap must shoulder on the housing. A slight tap from a dead-blow hammer may be needed to achieve proper shouldering. 2. Insert the snap ring into the groove of the housing. Caution: Make sure the snap ring overlaps properly in the groove.

TC1324

17

3. Insert the lock ring into the groove behind the snap ring, and secure it with the 3/8" hex-head bolts.

4. Thread a lifting eye (5/8”-11 UNC) into the top shaft and pull the top shaft through the top cap. The actuator is now completely assembled and ready to be mounted onto bonnet. (See “Actuator to Bonnet Installation” below.)

IX. Actuator to Bonnet Installation A. Preparation For Assembly Note: Drift the valve before installing the actuator to the bonnet and valve. Inspect the bonnet threads and bonnet stem threads for dings, nicks, burrs or debris. Clean and apply an anti-seize compound generously to all threads.

TC1324

18

B. Installation of Lower Ring and Lower Spring Retainer 1. Lift the lower ring over the bonnet stem and down on the bonnet. Align the ring threads with the bonnet, then rotate the lower ring in a clockwise direction until it bottoms out on the bonnet.

TC1324

19

C. Installation of Spring and Upper Spring Retainer 1. Generously grease both ends of the spring. Place the spring on the lower ring, centering the spring with the bonnet stem. 2. Grease the bottom and inside surfaces of the upper spring retainer and place the upper spring retainer on top of the spring. The upper spring retainer should fit comfortably on the spring.

TC1324

20

D. Installation of Downstop Apply an anti-seize compound to the downstop threads. Insert the downstop through the upper spring retainer. Aligning threads, rotate the downstop in a clockwise direction. This will begin the spring compression process. Use an adjustable wrench on the downstop wrench flats to compress the spring. The downstop will bottom out on the bonnet stem. This will fully load the spring and will apply a backseat spring force to the bonnet and bonnet stem.

TC1324

21

E. Final Assembly 1. Place the actuator on the spring/downstop sub-assembly, then rock the actuator from side to side to assist with alignment. Caution: The counterbore on the bottom of the top shaft must seat on the nub of the downstop, and the counterbore of the lower housing must seat on the lower ring. 2. Rotate the actuator to align the bolt holes of the lower ring and the threaded holes in the lower housing. Install the hex head bolts and lock washers and tighten them securely. 3. Attach the actuator supply lines. Actuator installation is now complete.

TC1324

22

X. Service and Repair A. Top Shaft Seal Replacement 1. Disassembly a) Bleed off all pressure to the actuator. b) Using a small flat screwdriver, remove the retaining ring and pry the seal retainer up and off the top shaft. c) Remove the wiper ring from the seal retainer ID, clean it thoroughly, and set it aside. Replace if damaged. d) Carefully remove the seal from the top plug of the actuator top cap and off the top shaft. 2. Reassembly a) Remove dirt and grease from the top shaft and the top cap sealing bore. Inspect both the top shaft and the sealing bore for nicks, dings, excessive wear or damage; replace them if necessary. Lightly grease the top shaft and sealing bore. b) Install a new seal over the top shaft and down into the sealing bore of the top cap. Caution: Make sure the seal lips are facing down toward the bottom of the actuator. c) If required, Install a new wiper ring into the groove in the seal retainer. Caution: Make sure the lip of the wiper ring is pointing away from the actuator and seal, and toward the grooved end of the seal retainer. d) Grease the assembled seal retainer, place it over the top shaft, and push it down the top shaft into the sealing bore of the top cap until it has been recessed below the retainer ring groove. e) Install the retainer ring into the groove in the top cap sealing bore. Caution: Make sure the retainer ring is seated completely into the groove.

TC1324

23

f) Apply pneumatic supply pressure, stroking the actuator several times to verify that the top shaft, seal, and top cap seal are installed properly.

B. Top Shaft Replacement 1. Disassembly a) Bleed off all supply pressure to the actuator and remove the supply line. b) Inspect and clean the top shaft thoroughly. c) Remove the hex head bolts used to retain the lock ring, then use a small flat screwdriver to pry the lock ring out from behind the snap ring. Remove it and set it aside. d) Use a screwdriver to dislodge the snap ring from its groove in the housing. Remove it and set it aside. e) Lift the actuator top cap and piston sub-assembly from the actuator and place it on a flat surface. A lifting eye (5/8" - UNC) may be threaded into the top shaft and used to lift the assembly. f) Lift the top cap from the top shaft and piston sub-assembly. Inspect all components thoroughly and replace any damaged or excessively worn parts. Clean the seal, seal retainer, and O-ring areas, grease them, and set the top cap aside. g) Remove the top shaft by turning the top shaft-piston sub-assembly on its side and pushing the top shaft through the retainer nut and piston. Inspect the top shaft and the piston sub-assembly thoroughly; replace any damaged or excessively worn parts. 2. Reassembly a) Clean the piston, retainer nut and O-ring areas; grease them and set them aside. b) Inspect the actuator housing; replace it if it is damaged. Clean the housing thoroughly and apply grease to the entire housing I.D.

TC1324

24

c) Generously grease the top shaft and insert it slowly from the bottom of the piston through the retainer nut. Firmly push the top shaft inside the piston, allowing the top shaft to shoulder on the retainer nut. Caution: Care should be used during assembly to protect the O-rings and top shaft from damage. d) Lift the piston sub-assembly, carefully center it, then lower it slowly down into the housing. A lifting eye (5/8" - UNC) may be threaded into the top shaft and used to lift and lower the piston assembly into housing. The top shaft counterbore should slip over and down onto the nub of the downstop. Keep the piston as level as possible and press firmly to install it into housing. A dead-blow hammer may be used (softly) to drive the piston into the housing bore. e) Again, generously grease the top shaft. Lift the top cap sub-assembly and center it over the top shaft, then lower it slowly to allow the top shaft to slide smoothly through the seal. A slow and smooth movement will help protect the seal from damage. Caution: The top cap must shoulder on the housing. A slight tap from a dead-blow hammer may be needed to achieve proper shouldering. f) Insert the snap ring into the groove in the housing. Caution: Make sure the snap ring overlaps properly in the groove. g) Lightly grease the lock ring and insert it into the groove behind the snap ring. Secure it with hex head bolts. h) Re-attach the pneumatic supply lines, then stroke the actuator several times to verify that all seals are functioning properly.

TC1324

25

C. Replacement of Top Cap O-Ring Seal 1. Disassembly a) Bleed off all supply pressure to the actuator and remove the pneumatic supply lines. b) Inspect and clean the top shaft thoroughly. c) Remove the hex head bolts used to retain the lock ring, then use a small flat screwdriver to pry the lock ring out from behind the snap ring. Remove it and set it aside. d) Use a screwdriver to dislodge the snap ring from its groove in the housing. Remove it and set it aside. e) Lift the top cap from the actuator and place it on a flat surface with the thread boss end down. A lifting eye (5/8" - UNC) may be used to lift the top cap. f) Remove the old O-ring and thoroughly clean the O-ring groove. Apply silicone grease to the O-ring groove and to the new O-ring, then install the new O-ring. 2. Reassembly a) Visually inspect all components and replace any damaged or excessively worn parts. Clean the seal, wear ring, and seal retainer areas. Clean the O-ring sealing bore in the housing. Apply grease to all of the O-ring sealing bore in the housing. b) Apply grease to the top cap through bore, then generously grease the top shaft. c) Lift the top cap sub-assembly over the top shaft, center it, then lower it slowly, allowing the top shaft to slide smoothly through the Polypak seal. A slow and smooth movement will help protect the seal from damage. Keep the top cap as level as possible and press it firmly to install into housing.

TC1324

26

Caution: The top cap must shoulder on the housing. A dead-blow hammer may be used (softly) to drive the top cap sub-assembly down into housing bore. d) Insert the snap ring into the groove in the housing. Caution: Make sure the snap ring overlaps properly in the groove. e) Lightly grease the lock ring and insert it into the groove behind the snap ring. Secure it with hex head bolts. f) Re-attach the pneumatic supply lines, then stroke the actuator several times to verify that all seals are functioning properly.

D. Replacement of Piston and Retainer Nut O-Rings 1. Disassembly a) Bleed off all supply pressure to the actuator and remove the pneumatic supply lines. b) Inspect and clean the top shaft thoroughly. c) Remove the hex head bolts used to retain the lock ring, then use a small flat screwdriver to pry the lock ring out from behind the snap ring. Remove it and set it aside. d) Use a screwdriver to dislodge the snap ring from its groove in the housing. Remove it and set it aside. e) Lift the top cap and piston sub-assembly from the actuator and place it on a flat surface. A lifting eye (5/8" - UNC) may be threaded into the top shaft and used to lift the assembly. f) Lift the top cap from the top shaft and piston sub-assembly. Inspect all components thoroughly and replace any damaged or excessively worn parts. Clean the seal, seal retainer, wear ring and O-ring areas, then grease them and set the top cap aside. g) Remove the top shaft by turning the top shaft-piston sub-assembly on its side and pushing the top shaft through the retainer nut and piston. Inspect the top shaft and piston sub-assembly thoroughly; replace any damaged or excessively worn parts.

TC1324

27

h) Remove the retainer nut from the piston by rotating it in a counter-clockwise direction. i) Remove the old O-rings from the retainer nut. Clean the retainer nut thoroughly and apply grease to all three O-ring grooves. Install new O-rings, then set the retainer nut aside. j) Remove the old O-ring from piston. Clean the O-ring groove thoroughly and apply grease to it. Install a new piston O-ring. 2. Reassembly a) Apply an anti-seize compound to the threaded bore of the piston. Clean the retainer nut sealing surface on the top face of the piston. b) Align the retainer nut and piston threads. Rotate the retainer nut in a clockwise direction and tighten it securely. Apply additional grease to the bore of the retainer nut and the piston O-ring OD. c) Inspect the actuator housing; replace it if damaged. Clean the housing thoroughly and apply grease to the entire housing I.D. d) Generously grease the top shaft and insert it slowly from the bottom of the piston and through the retainer nut. Firmly push the top shaft inside the piston, allowing the top shaft to shoulder on the retainer nut. Caution: Use care during assembly to protect the O-rings and top shaft from damage. e) Lift the piston sub-assembly, carefully center it, then lower it slowly down into the housing. A lifting eye (5/8" - UNC) may be threaded into the top shaft and used to lift and lower the piston assembly into housing . The top shaft counterbore should slip over and down onto the nub of the downstop. Keep the piston as level as possible and press firmly to install it into housing. A dead-blow hammer may be used (softly) to drive the piston into the housing bore. f) Again, generously grease the top shaft. Lift the top cap sub-assembly and center it over the top shaft, then lower it slowly to allow the top shaft to slide smoothly through the seal. A slow and smooth movement will help protect the seal from damage.

TC1324

28

Caution: The top cap must shoulder on the housing. A slight tap from a dead-blow hammer may be needed to achieve proper shouldering. g) Insert the snap ring into the housing groove. Caution: Make sure the snap ring overlaps properly in the groove. h) Lightly grease the lock ring and insert it into the groove behind the snap ring. Secure the lock ring with hex head bolts. i) Re-attach the pneumatic supply lines, then stroke the actuator several times to verify that all seals are functioning properly.

TC1324

29

XI. Periodic Maintenance The following maintenance schedule is recommended for normal operations: When actuator seals are replaced.

Inspect pistons, actuator head, actuator cap and top shaft.

Twice a month

Close and open SSV. Operation should be smooth and consistent in both directions.

Every month

Inspect relief valve and control line fitting for leaks. Remove any debris from fitting.

Every 6 months

Visually inspect for external damage such as dents, scratches, etc. If scratched or chipped, touch up with paint to prevent rust. If dented, disassemble and inspect actuator to ensure the damage does not affect the actuator’s performance.

At least every 12 months or when leakage occurs.

Replace seals.

Every five years or when leakage occurs.

Replace seal and O-ring seals.

As required following damage or continual leaking.

Replace relief valve.

As required

Clean debris from vent or breather holes.

Note: In order to maintain the traceability requirements, all certified replacement parts must be documented and referenced in writing to each individual SSV Actuator by its serial number.

NO EXCEPTIONS Use the API 6A-Appendix L SSV Failure Report form for reporting failures.

TC1324

30

XII. Troubleshooting Problem

Control pressure in actuator will not build.

Actuator will not stroke on a valve whether or not valve is pressurized. Gate valve does not stroke open when control pressure is applied.

Actuator will not attach to bonnet assembly.

Actuator will not stroke to full closed or failsafe closed position

Valve will not drift after assembly of bonnet/actuator.

Probable Cause

Corrective Action

Damaged control line.

Inspect control line for damage and/or leaking.

Insufficient pressure in control line.

Install gauge at pressure source to verify desired pressure available.

Faulty pressure gauge.

Verify pressure gauge is correctly calibrated.

Leaking around bottom of actuator.

Replace and/or inspect seals in accordance with assembly instructions.

Insufficient pressure in control line.

Verify pressure availability from source. Consult operating pressure calculation information from the information chart per size valve application.

Bonnet to stem binding.

Consult appropriate maintenance and operating instructions for bonnet.

Valve and/or seats improperly installed.

Remove actuator. Remove bonnet per appropriate maintenance and operating manual per bonnet manufacturer. Repair and/or replace valve components in accordance with valve manufacturer’s instruction manual.

Debris in valve.

Remove actuator per instruction manual. Remove bonnet per instructions per bonnet manufacturer maintenance and operating manual. Clean debris from valve body.

Debris in spring housing.

Re-inspect housing and spring.

Bonnet stem is not fully extended and back seated.

Grasp stem in bonnet and pull to full extension, properly back-seating stem.

Damaged or wrong thread on bonnet stem and downstop on bonnet/spring assembly.

Check threads on bonnet stem and downstop for burrs, nicks, dings, and debris. Check size and thread pattern for proper engagement.

Gate and seats are improperly installed causing excessive friction.

Remove actuator per instructions in manual. Manually push and/or pull bonnet stem to determine severity of binding. If severe, clean and inspect gate and seats for wear abrasion. Replace if necessary.

Incorrect number of spacers installed.

Remove actuator per instructions in the manual. Check number of spacers.

Incorrect spacer per valve size.

Remove actuator and check for proper spacer per bill of material.

Improper gate to stem engagement.

Remove actuator per instructions in manual. Remove bonnet per bonnet manufacturer’s instructions. Check engagement per valve manufacturer’s instructions and/or drawings. Reassemble.

TC1324

31

MP13 Pneumatic Piston Actuator Assembly

TC1324

32

Parts List Item

Description

Quantity

1

Top Shaft

1

2

Top Cap

1

*3

Seal Retainer

1

*4

O-Ring

1

*5

O-Ring

2

6

Retainer Nut

1

*7

Wiper Ring

1

*8

Seal

1

*9

O-Ring

2

10

Snap Ring

2

11

Lock Ring

2

12

Piston

1

13

Downstop

1

14

Spring Retainer

1

15

Lock Washer

8

16

Retainer Ring

1

17

Housing

1

18

Spring

1

19

Lower Housing

1

*20

Relief Valve

1

21

Caution Tag

1

22

Nameplate

1

23

Drive Screw

4

24

Lower Ring

1

25

Bolt

8

26

Bolt

4

27

Vent Fitting

2

*Included with repair kit. Recommended spare parts.

TC1324

33

Technical Specifications Non-Retained Fluid Powered Model

MP13

Sizes

MP1302 through MP1304

Sizing

See “Operating Pressure Calculations”

API Classification

6A, 6D

TRIM.

Standard - AA

PSL

1, 2, 3

6A SSV Service Class - Performance Rating

PR1 or PR2

Maximum Operation Pressure

250 PSI

Relief Device Setting

250 PSI (17 Bars) at 130°F (54°C)

Test Pressure

375 PSI (26 Bars)

Nominal spring preload at full closed position

750 lb force

Weight

135 lb (61 kg)

Temperature rating

0°F to 150°F (-18°C to +66°C)

Retained Fluid Powered* Trim

Same as valve

PSL

Same as valve

Temperature rating

Same as valve

*Consult Cameron Willis Engineering for further details on retained fluid powered actuators.

TC1324

34

Physical Dimensions Ø1.25”

2.75” - 8 Stub Acme ½”NPT

“A”

“B” “C”

Ø8.12”

Ø14.00”

Valve Size

“A”

“B”

“C”

2”

19.81”

15.84”

13.74”

3”

19.81”

15.84”

13.74”

4”

22.18”

17.12”

15.00”

SD 034723

TC1324

35

Clearance Removal Dimensions

“A” Actuator Removal Clearance

Valve Size Valve Size

“A”

2”

11.00”

3”

11.00”

4”

12.00”

SD 034722

TC1324

36