Baker Hughes Spring Diaphragm Actuators 87/88 Series are reliable and efficient devices designed for precise control in industrial applications. These actuators ensure optimal performance and longevity through effective maintenance strategies, making them essential for automation and process control systems.

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Manual for Baker Hughes Spring Diaphragm Actuators 87/88 Series

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Baker Hughes Spring Diaphragm Actuators 87/88 Series

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Maintenance Plans for Baker Hughes Spring Diaphragm Actuators Model 87/88 Series

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1 Yearly Inspection

- The current estimated useful life period for the 87-88 Series Actuator is 25+ years. To maximize the useful life of the product, it is essential to conduct annual inspections, routine maintenance and ensure proper installation to avoid any unintended stresses on the product. The specific operating conditions will also impact the useful life of the product. Consult the factory for guidance on specific applications if required prior to installation.;

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Spring Diaphragm Actuator Maintenance

Replace diaphragm seal and stem seal, air to open actuators (Model 88), size 3 A. Shut off air supply to the actuator, isolate the control valve process pressure to eliminate the valve from moving with spring tension removed.

B. If valve is equipped with a handwheel, rotate handwheel to a free position.

C. Remove four diaphragm case cap screws and nuts (27 and 28) leaving the other four installed on the case equally spaced.

D. Remove tension bolts (four remaining 27 and 28) in multiple steps to relieve spring tension gradually. Remove upper diaphragm case (24).

E. Note position of springs (21) and spring spacers (18)[if equipped] in the diaphragm plate (26), before you remove these parts.

F. Remove springs (21) and spring spacers (18) if used.

G. Loosen lock nuts (1). Re-tighten lock nuts against each other so they will lock at a point that is not against the stem flange (2). By means of a wrench, hold the nuts (1) and plug stem. Turn the actuator stem (10) subassembly until it disengages from the plug stem and remove completely from actuator.

H. Remove case cap screws (16) and spring guide (29).

I. Remove lower diaphragm case (17) to gain access to O-ring (13).

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Spring Diaphragm Actuator Maintenance

Replace or repack handwheel bearing size 16 and 23 actuators A. Rotate handwheel to a free position.

B. Remove lock pin (91), cap screw (93), and washer (94) to release handwheel cover (57).

C. Remove pivot pins (33) which engage the handwheel pivot (36) thru the yoke.

D. Remove snap rings (46) and remove lever pin (45) to release complete handwheel assembly.

E. Remove cap screw (97) and end flange (96) to release the handwheel stem (39) from the bearing.

F. Remove snap ring (35) to release bearing (34).

G. Replace or clean to repack the bearing with new grease.

H. Pack bearing (34) with Mobilux No. 2 grease or equal.

I. For remounting, reverse removal procedures from step (F) through (B).;

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Spring Diaphragm Actuator Maintenance

Replacing diaphragm air to close actuator (Model 87), size 3 without handwheel A. Shut off air supply to the actuator and remove air piping from the upper diaphragm case (24).

B. Check the travel indicator on stem flange (2) against the travel scale (9) to ensure that the plug is up (off the seat).

C. Loosen stem lock nuts (1).

D. Re-tighten lock nuts (1) against each other so they will lock at a point that is not against the stem flange (2).

E. Turn the stem lock nut (1) counterclockwise and loosen the plug stem until it disengages from the actuator stem (10).

F. Remove four diaphragm case cap screws and nuts (27 and 28) leaving the other four installed on the case equally spaced.

G. Remove tension bolts (four remaining 27 and 28) in multiple steps to relieve spring tension gradually. Remove upper diaphragm case (24).

H. Remove hex nut (23) and spacer (14).

I. Replace the new diaphragm (25) on the diaphragm plate (26).

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Spring Diaphragm Actuator Maintenance

Replacing diaphragm air to close actuator (Model 87), size 6, 10, 16 and 23 without handwheel

A. Shut off air supply to the actuator and remove air piping from the upper diaphragm case (24).

B. Remove the two socket head cap screws (5) which hold the top and bottom stem connector (2 and 4) together.

C. Remove diaphragm case cap screws and nuts (20 and 19).

D. Remove tension bolts (27 and 28) in multiple steps to relieve spring tension gradually. Remove upper diaphragm case (24). E. Remove jam nut (23) and diaphragm washer (22).

F. Replace new diaphragm (25) on the diaphragm plate (26).

G. Coat the actuator stem threads (10) and the surfaces of washer (22) with Dow Corning Sealant Compound III or its equivalent. Install washer (22) and tighten fastener (23).

H. Replace upper diaphragm case (24) and tension bolts (27 and 28).

I. Tighten the tension bolts (27 and 28) in equal steps until the cases meet. Replace the remaining cap screws (20) and nuts (19).

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