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Baker Hughes
Copyright 2021 Baker Hughes Company. All rights reserved.
Model 52 O-ring, Guide Ring and Rod Scraper Replacement - Air-to-Extend Without Handwheel
During assembly or maintenance, and under operation in some conditions the operators or
technicians must be alert and aware of all possible pinch points or areas where there are moving or
sliding components.
1. Shut off the air supply to the actuator, and isolate the process pressure from the valve.
2. Disconnect supply piping from the Top Plate (17) (Figure 9 on page 21).
3. Remove the Indicator Arm (23), Split Clamp (22), Hexagon Bolts (24) and Spring Lock Washers (25).
4. Remove the Hexagon Nuts (20), Spring Lock Washers (29), and Center Bolts (19).
5. Remove the Top Plate (17) and Cylinder Tube (14), carefully avoiding any horizontal misalignment.
6. Replace the O-ring (21) on the Top Plate (17) and the O-ring (21) and Guide Ring (16) on the Piston Plate (15)
with new parts. Coat the O-rings and Guide Ring with silicone grease (or equivalent).
7. Rotate the Piston Plate subassembly (15) until the chamfer in the Compression Nut (12) aligns with the stop
collar opening in the Piston Plate subassembly.
8. Remove Piston Plate subassembly (15) in the direction of an arrow.
Figure 14 - Stop Collar Opening
Figure 15 - Piston Subassembly Removal
Stop Collar
Openin
Chamfer of
Compression
Nut
Take care while handling the Cylinder Tube (14), since the Piston Plate S/A (15) can fall out (see “Model 51
O-ring, Guide Ring Replacement - Double Acting With/Without Handwheel” on page 24)
