Instruction Manual
D100425X012
YD and YS Valves
October 2014
17
CAUTION
To prevent possible product damage, c over the opening in the valve in the following procedure to protect the sealing
surfaces and to prevent foreign material from getting into the valve body cavity.
3. Remove and discard the existing bonnet gasket. Cover the valve body opening to protect sealing surfaces and to
prevent foreign material from entering the valve body cavity.
Note
The ENVIRO-SEAL stem/bellows assembly for YD and YS valves is available only with a threaded and drilled plug/adaptor/stem
connection. The existing valve plug can be reused with the new stem/bellows assembly or a new plug can be installed.
4. Inspect the existing valve plug. If the plug is in good condition, it can be reused with the new ENVIRO-SEAL
stem/bellows assembly. To remove the existing valve plug from the stem, first, place the existing plug stem
assembly and valve plug in a soft-jaw chuck or other type of vise so that the jaws grip a portion of the valve plug that
is not a seating surface. Drive out or drill out t he pin (key 8).
5. Reversetheplugstemassemblyinthesoft-jawchuckorvise.Gripthevalvesteminanappropriateplaceand
unscrew the existing plug from the valve stem.
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.
6. To attach the valve plug to the stem of the new ENVIRO-SEAL stem/bellows assembly, first attach the pl ug to the
adaptor (key 24). Locate the adaptor. Notice that a hole has not been drilled in the threads where the 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 appropriate torque value.
7. Select the proper size of drill bit 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 to lock the plug/adaptor assembly together.
8. Attach the plug/adaptor assembly to the ENVIRO-SEAL stem/bellows assembly by first securing the stem/bellows
assemblyinasoft-jawchuckorothertypeofvisesothatthejawsofthechuckorvisegriptheflatsofthestem
extendingoutofthetopofthebellowsshroud.Screwthevalveplug/adaptorassemblyontothevalvestem.
Tightenasnecessarytoalignthepinholeinthestemwithoneoftheholesintheadaptor.Securetheadaptortothe
stem with a new pin.
9. Inspect the seat ring (key 9) and soft seat parts (keys 21, 22, and 23); replace, if necessary.
10. Place a new gasket (key 10) into the valve in place of the bonnet gasket. Install the new stem/bellows assembly
with valve plug/adaptor by placing it into the valve on top of the new bellows gasket.
(24 páginas)
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