Baker Hughes Linear Piston Spring Return Actuators are designed for reliable and efficient operation in industrial applications. These actuators provide precise control and quick response, making them ideal for various automation needs. With robust construction and easy maintenance, they ensure optimal performance and longevity in demanding environments.

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Manual for Baker Hughes Linear Piston Spring Return Actuators

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Baker Hughes Linear Piston Spring Return Actuators

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Maintenance Plans for Baker Hughes Linear Piston Spring Return Actuatorsnull

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Checking Buffer System or Vent Breather

1. For pneumatic buffer system, check for leaks around the check valve and up to the cylinder port to ensure the system is working.

2. For vent breather, replace the unit at the first signs of moisture inside the canister. For a working regulator, it is recommended to replace the cartridge annually. The replacement part number is 22-2542.

3. When additional accessories are used (MCV, Versa Valves, etc.) all parts must be connected through the check valve.;

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Checking Piston Seals

1. Apply 100 psig power supply gas to the cylinder top port and ZERO pressure to the cylinder bottom port.

2. Remove the tubing fitting (and pneumatic buffer or desiccant canister) from the actuator cylinder bottom port.

3. Check for excessive piston seal leakage at the ZERO pressure port.

4. Apply 100 psig power gas supply to the cylinder bottom port and ZERO pressure to the cylinder top port.

5. Remove the tubing fitting from the actuator cylinder top port.

6. Check for excessive piston seal leakage at ZERO pressure port.;

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Checking Tube Seals

1. Remove the pneumatic buffer system or desiccant canister. 2. Pressurize the normally pressurized side of the cylinder with at least 100 psig power supply gas. 3. Apply a leak-check solution around the perimeter of the cylinder tubing wall. Any leakage should be easily visible. 4. Follow procedure 5 on page 13 to replace tube seals.

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Cylinder Piston Rod Leakage Inspection

1. Fully pressurize "rod" side of actuator cylinder.

2. Ensure both block valves are closed.

3. Observe gauge needle opposite from "rod" side of cylinder; if gauge needle moves, then piston seals (u-cups) may need replacement.

4. Repeat steps 1 and 2.

5. Observe gauge needle on "rod" side of cylinder. If needle shows a decrease in pressure, piston rod seals must be replaced. Follow procedure 6 on page 15 to replace piston rod seals.;

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Replacing Piston Rod Seals

1. Remove the power supply gas pressure. Depressurize all instrumentation and the actuator cylinder (A).

2. Remove 2 socket head cap screws (B) from rod clevis assembly (C). Remove back rod clevis (D) and front rod clevis (E) from stud extension (F) and valve stem (G).

3. For fail open actuators: - Remove 4 hex nuts (H), 4 lockwashers (I), and 4 hex head cap screws (J) that are used to mount cylinder (A) to spring cartridge (K).

- Remove cylinder (A) and spring cartridge (L) from housing assembly (M). A rod extension (N), stud extension (F), rod flange (O), and 3 jam nuts (P) will be attached to cylinder (A) rod.

- Unscrew jam nut (P) and rod flange (O) from stud extension (F).

- Remove cylinder (A) from spring cartridge (L). A rod extension (N), stud extension (F), and 2 jam nuts (P) will be attached to cylinder (A) rod.

- Remove jam nuts (P), stud extension (F), and rod extension (N) from cylinder (A). The cylinder (A) should now be isolated.

4. For 4”, 5”, and 6” bore cylinders: - Remove tie rod nuts (T) from top flange (U). If tie rod nut (T) seizes and tie rod (V) unscrews, remove entire tie rod (V).

- Remove tie rods (V). Mounting flange (W) and bearing assembly (X) will both come out, revealing rod seal (Y). Remove rod seal (Y).

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