Baker Hughes Reducing and Differential Pressure Regulators 535V and 535V-50

- The fastest and simplest way to replace packing is to remove the entire actuator without disturbing actuator parts or calibration. However, this is not recommended for regulators with a small Cv (Cv < 0.6), due to the very fineness of their plug. In this event, disassemble the regulator to replace the packing (See under “Disassembly”, page 5).

- Remove safety pin (11) from body. The safety pin engages the packing spacer (5). The function of safety pin and spacer is to prevent the plug from being pushed out if the actuator is removed while the regulator is still pressurized. The regulator internal parts cannot be removed unless the safety pin is removed first. Remove two packing flange nuts (8b) and two mounting nuts (8a). Remove also two mounting screws (16).

- Remove the actuator-plug assembly off the regulator.

- Clean the packing box and plug stem and carefully place new rings of packing around the stem. Position the skive cut of each packing ring 120˚ from that of the adjacent ring.

Reassemble the actuator-plug assembly to the regulator body, taking care: to align hole in spacer (5) with safety pin hole

to replace two mounting nuts (8a) before nuts (8b)

to take extra care in guiding each ring into the packing box.

- Tighten two nuts (8a) and two screws (16) on the actuator yoke.

- Wrap the safety pin (11) with two turns of PTFE tape (Teflon). Screw it into the bonnet five and a half to six turns from where threads engagement starts.

If there is excessive leakage through the regulator when it is shut off, the cause may be: - Foreign matter holding valve off seat: disassemble and clean

- Normal wear of seating surfaces: disassemble and replace plug and/or seat ring

- Seat ring gasket damaging (except with trim for Cv max. 3.8): replace gasket.

- Disconnect the control line(s) at the diaphragm case.

- Remove the two packing flange nuts (8b). Raise packing flange (10) up the plug stem and remove the two nuts (8a) as well as the two mounting screws (16).

- By means of two flat spanners, unlock the plug stem nuts (27) and unscrew them to the threaded end of the plug stem (12 or 183). Tighten nuts in this position.

- Fasten the actuator to a hoisting gear and very slowly pull out the actuator-plug S/A.

- With a flat spanner applied on the nuts (27), unscrew the plug stem from the actuator stem while pulling out vertically and slowly the actuator. Carry on until plug stem is fully unscrewed from actuator stem.

- To add a ring of packing, depressurize the regulator, back off packing flange nuts (8b) all the way, lift the packing flange and follower and insert one ring of packing. Tighten nuts (8b) finger tight plus one full turn.;