IM-50-2, Rev. B
July 29, 2011
Page 2 of 5
2. These valves may be installed in any position using good pipe fitting practices. Flanges
conform to ASME Standard B16.5, Class 150 or Class 300.
3. Periodically check and tighten body joint and flange bolting. (See TABLE 1 for torque
requirements.)
MANUAL OPERATION:
1. The valve is opened and closed by turning the handle ¼ turn (90°). Turning the handle
clockwise closes the valve (handle perpendicular to pipeline). Turning the handle
counterclockwise opens the valve (handle parallel to pipeline).
AUTOMATED OPERATION:
1. Valves with Actuators should be checked for alignment of the actuator to the valve.
Angular or parallel misalignment may result in high operational torque, and potential
damage to the stem seals or stem.
STEM SEAL ADJUSTMENT:
1. Stem seal leakage may be corrected without disassembly. If leakage is evident in stem
packing area, tighten the gland bolts 1/4 turn, each. If leakage persists, repeat above.
Replacement of stem seals is indicated if the leak is still apparent after 1/2 turn.
DISASSEMBLY:
-CAUTION-
If the Valve has been used to control hazardous media, it must be decontaminated before
disassembly.
---WARNING---
Do not attempt to repair or partially disassemble a valve while it is in line and under pressure.
Isolate the line, de-pressurize, and remove valve prior to performing maintenance.
1. Remove flange bolts and nuts and lift valve from line. Care should be taken to avoid
scratching or damaging flange facings.
2. Remove handle, snap ring, and travel stop plate.
3. Remove gland bolts, gland, and gland ring from stem.
4. Remove body end nuts, using proper wrench size. Lift off body end. One seat should
come out with body end.
