Baker Hughes Cage Guided Globe Valve with Lo-dB Anti-cavitation/API 6A capabilities 41005 Series

- Packing box maintenance is one of the principle action items of routine servicing. Tightness of the packing is maintained by packing compression. Compression is achieved by evenly tightening the packing flange nuts (3) against the packing flange (4). Care must be taken not to over tighten as this could prevent smooth operation of the valve. If all compression is used up and the valve leaks, then new packing is required.

- Braided PTFE with Carbon or Aramid Core

A. Loosen and remove packing flange nuts (3).

B. Lift the packing flange (4) and packing follower (23) up the valve stem.

C. By means of a hooked instrument, remove packing rings ensuring not to damage the sealing surfaces of the packing box or plug stem.

E. Replace packing follower (23) and packing flange (4).

F. Replace and tighten packing stud nuts (3).

G. Place valve back in service and only tighten packing as necessary to stop external leakage.

- Before reassembly, check parts and the materials for conformity to the bill of material call out. Inspect inside of body (B001), Bonnet (B003), Cages (B107, B110) and plug (B112) for cleanliness.

- Remove any foreign matter and clean the gasket surfaces.

- Inspect body (B001), Bonnet (B003), Cages (B107, B110), gaskets (B103, B108, B118, B015), plug (B112), plug stems (B150), and bushings (B203) for nicks, scratches, burrs, sharp corners, etc., on sealing and sliding surfaces including packing box.

- Important: During assembly, care must be exercised to prevent damage to these parts. Since 41005 API 6A are high pressure valves, ensure there is no damage to the sealing surfaces. Performance of gaskets and seal are strongly linked to surface roughness.;

Before re-assembly, the parts must be carefully examined in order to eliminate any scratched, worn or damaged parts.

The guiding surfaces of the cage and valve plug, the guide bushing, and the guiding surfaces of the plug stem and packing box must be checked. Otherwise, the part must be replaced as soon as possible.

Seating Surfaces - Inspect all seating surfaces per Figures 2 and 3 which represents all plug and seat types. The cage (B107), plug (B112) seating surfaces must be completely free of dents, wear and scratches.

- If valve plug (B112) or cage (B107) seating surfaces show signs of slight deterioration, they can be touched up on a lathe.

- For all valve types, when dressing up critical surfaces, no more than 0.25 mm (0.010”) of metal must be removed in the case of an 80 or 100 mm (3” or 4”) valve, and no more than 0.4 mm (0.015”) in the case of a 150 to 250 mm (6” to 10”) valve. Make sure that the seating angle indicated in Figures 2 and 3 is respected.

- If a slight defect exists on any of the above seating surfaces, lapping can be envisaged, in which case the following must be respected: 1. Spread a fine layer of high-quality sealing compound on the seating surface.

2. Put the cage (B107) in the body, noting the angle.

3. Assemble the valve plug (B112) and Stem (B150).

A. Unscrew and remove the packing flange nut (B221) and packing flat washer (B921a)

B. Lift the packing flange (B219) up along the valve stem

C. Extract and remove the packing rings (B207) and anti-extrusion rings (B208), taking care not to damage the sealing surface of the packing box lantern or the valve plug stem.

D. Replace the packing rings, with the cut in each ring placed about 120° from the next, pressing them down one at a time and respecting the table below

E. Install Packing studs (B220)

F. Install the guide bushing (B203) in the bottom of the packing box.

G. Install packing set (B207 and B208)

H. Assemble Packing flange/follower (B219)

I. Screw the packing flange nuts (B221) by hand

Prior to assembly the packing: • Ensure there are no nicks or scratches on the stem and packing box inside diameter packing area.

Violation of any of these requirements is cause for stem or packing box rejection Tightness of the packing box is obtained by compression of the packing rings (B207) and anti-extrusion rings (B208).

- Compression must be achieved by evenly tightening the packing flange nuts (B221) on the packing flange (B219).

- Periodical retightening of the packing flange nuts is required to maintain tightness.

- Make sure that the packing is not over tightened as this could prevent smooth operation of the valve.

- If a leak persists after the packing has been compressed to a maximum, the packing needs to be changed.;