Baker Hughes Safety Valve 1900/P Series

- Now all parts should be cleaned. First remove grease and sealants, then remove rust and scale. Inspect the internal parts to ensure they are not damaged by galling. Look especially at the rubbing surfaces of the guide and disc holder.

- Inspect the spindle to ensure concentricity. Over-gagging is one of the common causes of bent spindles.

- Inspect the spring and washer assembly for excess clearance [greater than .031” (0.79 mm)] and inspect the bearing surfaces for galling.

1. Between the upper spring washer and the adjusting screw

2. The lower spring washer and the spindle shoulder

3. Spring - look for corrosion pits. Replace the spring if severe corrosion or pitting is present. If the spring has been in service a long time, measure the free length of the spring. Contact Baker Hughes and give this dimension, the spring number, and the valve set pressure to obtain their recommendations.

- On all disc holders, inspect the bearing surface between the spindle pocket of the disc holder.

- Inspect all bearing parts for concentricity, apply a very thin layer of Clover 3A grinding compound to the actual bearing surfaces, and grind together to determine if smooth, uninterrupted contact is made. If grinding does not restore the original condition or very close to it, then the parts should be replaced.

- Spherical surfaces should have a 63 RMS or better surface finish and their radius must be continuous. Each corresponding bearing surface should be conical and smooth with a 63 RMS or better surface finish. All traces of lapping compound must be carefully and totally removed prior to reassembly.