PROCEED HPA 3 Manual de Instruções descarregar pdf (Página 16)

Instruction Manual

D101634X012

HP and HPA Valves

October 2014

1. With the valve plug (key 5) removed according to the trim removal procedure, proceed as appropriate:

For HPD and HPAD valves, the piston rings (key 8) are each in at least two sections; remove the sections from the

grooves in the valve plug.

For HPS and HPAS valves, proceed to step 2.

For HPT and H PAT valves, work the retaining ring (key 10) off the valve plug with a screwdriver. Carefully slide the

backup ring and seal ring (keys 9 and 8) off the valve plug.

2. Toreplacethevalveplugstem(key6),driveoutthepin(key7),andunscrewthestemfromthevalveplug.

CAUTION

Never reuse an old stem with a new valve plug. Using an old stem with a new plug requires drilling a new pin hole in the

stem. This weakens the stem and may cause the stem to fail in service. If a new valve plug is required, always order a valve

plug, stem, and pin as an assembly. Specify the correct part number of each of the three parts, but state that the parts are

being ordered as an assembly.

A u sed valve plug may be reused with a new stem.

Figure 6. Detail of Protected Soft Seat

INNER PLUG

OUTER PLUG

CAGE

SEAT RING

PROTECTED SOFT SEAT

A7039

3. Thread the new stem into the valve plug and tighten it to the appropriate torque value given in table 9. Using the

valve plug pin hole as a guide, drill the pin hole through the stem. Refer to table 9 for drill sizes.

4. Drive in the pin to lock the assembly.

5. If it is necessary to lap the seating surfaces, complete the lapping seats procedure before installing the HPD/HPAD

piston rings or the HPT/HPAT seal ring. The Trim Replacement procedure provides piston ring and seal ring

installation instructions and valve reassembly instructions.

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