Instruction Manual
D100423X012
V500 Valve
July 2017
10
7. When the control valve is being put back into operation, check the packing follower for leakage, and retighten the
packing nuts as necessary.
Replacing Retainer, Seat Ring, and Face Seals
This procedure is to be performed if the control valve is not shutting off properly, if the port diameter is to be changed
by installing a different seat ring, or if seat ring inspection is necessary. The actuator and valve (key 1) must be
removed from the pipeline; however, the actuator may remain mounted during this procedure.
A retainer tool is required to remove the retainer (key 5), seat ring (key 4), and face seals (key 8). If specifically ordered,
a tool is supplied with the valve; a tool can also be ordered individually. If desired, a tool can be machined using the
dimensions shown in figure 7.
During assembly, handle the retainer, seat ring, and face seals carefully. Critical areas that must be protected are the
threads and inner surface of the retainer (key 5), the sealing surfaces of the face seals (key 8), the face seal grooves in
the seat ring (key 4), the shutoff surface of the seat ring, and the face seal surface in the valve body (key 1).
A new retainer gasket (key 11) is required whenever the retainer (key 5) is removed. Other parts in good condition can
be reused.
Disassembly of Retainer, Seat Ring, and Face Seals
Key numbers are shown in figures 11 and 13 unless otherwise noted.
1. Isolate the control valve from the line pressure, release pressure from both sides of the valve body, and drain the
process media from both sides of the valve. If using a power actuator, also shut off all pressure lines to the power
actuator, release all pressure from the actuator. Use lock‐out procedures to be sure that the above measures stay in
effect while you work on the equipment.
2. Remove line bolting. Then, remove the control valve from the pipeline and place the valve on a flat surface with the
retainer (key 5) facing up.
3. Rotate the valve shaft (key 3) to move the valve plug (key 2) into the open position.
Note
The retainer (key 5) was installed at the factory using the torque listed in figure 8.
4. Remove the retainer by engaging the retainer tool, attaching an impact wrench or other suitable tool, and
unscrewing the retainer. Inspect the retainer.
CAUTION
Place the retainer on a protected, flat surface where the threads and inner surface will not be contaminated or damaged.
5. Remove the retainer gasket (key 11). Inspect the gasket surfaces on the valve body (key 1).
6. Lift out the seat ring (key 4) and both face seals (key 8). Inspect the parts and place them on a flat, protected
surface.
7. Inspect the shutoff surface of the valve plug. If it is worn, nicked, or scratched, proceed to the Replacing Valve Plug,
Shaft, and Bearings procedure. If the parts are in good shape and do not require maintenance, continue to the
Assembly procedure.
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