Baker Hughes Energy Management Control Valve 49000 Series

- Gasket seating surfaces must be free of dents, scratches, corrosion, or other types of damage. Clean mating surfaces as required and replace any non-conforming parts. Spiral wound gaskets (10) must always be replaced after disassembly.;

Guiding surfaces of the cage, valve plug, guide bushing, plug stem, and auxiliary pilot plug must be checked.

- If there are only slight wear indications, then gently use a light abrasive, such as fine grit sandpaper, to smooth out guiding surfaces.

- Parts with greater damage or wear on the guiding surfaces must be replaced.

For the two-piece bonnet configurations: - Prior to reassembly, the metal seal (11) should be inspected for cracks or signs of wear.

- The metal seal can be reused if it is free from scratches, erosion, corrosion, or any other type of damage.

- If slight wear exists on the metal seal, a new layer of coating should be re-applied to the original condition by the factory or a Masoneilan Authorized Repair Center.

- Prior to reassembly of the valve, inspect the inside of the valve body around the area where the metal seal seats. It is common to find slight ridges or depressions from where the seal was originally seated.

- To prevent this potential leakage, machine the seating angle of the bonnet at 40 degrees by approximately 0.1 inches (2.5 mm) deep, thus causing the metal seal to seat further down inside the valve body (on a new un-deformed surface). Refer to Figure 4 for details.

- If this procedure is required more than twice, please consult the factory.;

- Tight sealing within the packing box is obtained by compression of the packing (15). Compression must be achieved by evenly tightening the packing flange nuts (19) on the packing flange (17). Periodic re-tightening of the packing flange nuts may be required to maintain proper sealing.

- Be careful not to over tighten the packing as this could prevent proper operation of the valve. If leakage persists after maximum packing compression, then the packing needs to be changed.;

- Carbon/PTFE and pure PTFE packing rings are cut in such a way that they can be replaced without having to separate the valve plug stem from the actuator stem.

- Unscrew and remove the packing flange nuts (19).

- Lift the packing flange (17) and packing follower (16) up along the valve stem (8).

- By means of a puller, remove the packing (15) being careful not to damage the sealing surface of the packing box or the valve plug stem.

- Replace the packing rings, placing the cut in each ring about 120° apart from the adjacent ring. Press rings in one at a time.

- Reassemble the packing follower (16) and the packing flange (17).

- Tighten the packing flange nuts (19) without over compressing the packing rings.

- Put the valve back into service and check for leakage.

- Tighten packing flange nuts (19) as required.