Fisher EZ easy-e Instruction Manual page 21

Instruction Manual
D100401X012
CAUTION
When installing a valve plug on the ENVIRO‐SEAL stem/bellows assembly, the valve stem must not be rotated. Damage to
the bellows may result.
Do not grip the bellows shroud or other parts of the stem/bellows assembly. Grip only the flat areas on the stem where it
extends out of the top of the bellows shroud.
Note
The ENVIRO‐SEAL stem/bellows assembly has a one‐piece stem.
Table 4. Recommended Torque for ENVIRO‐SEAL Bellows Seal Packing Flange Nuts
VALVE STEM DIAMETER
VALVE SIZE, NPS
THROUGH PACKING
1/2 ‐ 2
3 ‐4
6. To attach the valve plug to the stem of the new ENVIRO‐SEAL stem/bellows assembly, it is necessary to first attach
the valve plug to the adaptor (key 24, figure 11). Locate the adaptor. Notice that a hole has not been drilled in the
adaptor threads where the valve plug screws onto the adaptor.
Secure the valve plug in a soft‐jaw chuck or other type of vise. Do not grip the plug on any seating surface. Position the
plug in the chuck or vise for easy threading of the adaptor. Thread the adaptor into the valve plug and tighten to the
torque value given in figure 10.
Note
Valve plugs may not be pre‐drilled. Follow the procedure in the following step.
7. If the valve plug is not pre‐drilled, drill a hole according to figure 10. Otherwise, select the proper size of drill bit
(figure 10) and drill through the adaptor using the hole in the valve plug as a guide. Remove any metal chips or burrs
and drive in a new pin (key 8, figure 12) to lock the valve plug/adaptor assembly together.
Note
For some valve plug configurations, you must place the valve plug/adaptor assembly inside the seat ring retainer and bushing
assembly before attaching the adaptor to the stem extending from the bottom of the ENVIRO‐SEAL stem/bellows assembly. If this
task is necessary, then place the spiral wound gasket, shim, and bonnet gasket (keys 12, 25, and 10, figure 12) on the shoulder of
the seat ring retainer. Check the existing seat ring retainer and bushing assembly for clearances. If necessary, use appropriate
procedures to support the seat ring retainer while screwing the valve plug/adaptor assembly onto the valve stem extending from
the ENVIRO‐SEAL stem/bellows assembly.
8. Place a wrench on the flat areas of the valve stem just below the threads for the actuator/stem connection to keep
the stem from turning.
9. Screw the adaptor (key 24, figure 11), which also includes the valve plug or valve plug guide and may include the
seat ring retainer and bushing assembly and gaskets, onto the valve stem. Tighten the adaptor until it is
NSm
1/2 2
1 5
MINIMUM TORQUE
LbfSin
22
44
EZ Valve
November 2017
MAXIMUM TORQUE
NSm LbfSin
4 33
8 67
21