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Baker Hughes
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Model 52 O-ring, Guide Ring Replacement - Air-to-Extend with 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. The handwheel must be in the AUTO position. (see "Switching from Manual Operation to Auto Operation
Mode” on page 15).
2. Shut off air supply to the actuator, and isolate the process pressure from the valve.
3. Disconnect air piping from the top plate (Figure 8 on page 19).
4. Remove the Hexagon Nuts (20), Spring Lock Washers (29), and Center Bolts (19). Disassemble the Hex Nuts (20).
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 S/A (15)
with new parts. Coat the O-rings and Guide Ring with silicone grease (or equivalent). Coat the sliding surface of the
Compression Bolt with industrial grease (not silicone grease).
7. Replace Cylinder Tube (14), and Top Plate (17) with only axial movement. Coat the inner surface of the Cylinder
Tube with silicone grease.
Figure 12 - Model 52 O-ring and Guide Ring
Take care while handling the Cylinder Tube (14), since the Piston Plate subassembly (15) will be
loose (see “Model 51 O-ring, Guide Ring Replacement - Double Acting With/Without Handwheel”
on page 24).
O-ring
Guide ring
