Instruction Manual
D100425X012
YD and YS Valves
October 2014
15
13. Mount the bonnet onto the valve with the lubricator or pipe plug parallel with the pipeline.
Note
Stud(s) and nut(s) should be installed such that the manufacturer's trademark and material grade marking is visible, allowing easy
comparison to the materials selected and documented in the Emerson/Fisher serial card provided with this product.
WARNING
Personal injury or damage to equipment could occur if improper stud and nut materials or parts are used. Do not operate or
assemble this product with stud(s) and nut(s) that are not approved by Emerson/Fisher engineering and/or listed on the
serial card provided with this product. Use of unapproved materials and parts could lead to stresses exceeding the design
or code limits intended for this particular service. Install studs with the material grade and manufacturer's identification
mark visible. Contact your Emerson Process Management representative immediately if a discrepancy between actual
parts and approved parts is suspected.
14. Lubricate the valve stud bolts (key 15) and install the nuts (key 16) onto the bolts using good bolting practices.
Tighten the nuts to the recommended bolt torques given in table 5. A pattern similar to that shown in figure 8
should be followed.
Note
It might be necessary to repeat the bolting pattern several times until the bonnet-to-body seal is made, because the tightening of
one nut might loosen an adjacent nut. Repeat the pattern until none of the nuts will turn at the recommended torque.
15. Mount the actuator on the bonnet and make up the stem connection according to the procedure given in the
appropriate actuator instruction manual.
YS
1. Use new gaskets and shim (keys 9, 11, 12, 13, 14 and 22) on assembly and wipe all sealing surfaces with a clean
cloth.
2. Install the lower seat ring gasket (key 14) and place the lower seat ring (key 8) on top of the gasket followed by the
spiral wound spring (key 13).
3. Install the lower cage (key 4) into the valve, being certain that it fits down over the raised portion of the seat ring.
Thenarrowportionofthecagewindowsshouldpointdownward.
4. Place the upper seat ring gasket (key 12) into the valve.
5. If a new stem (key 5) is to be used, screw the stem into the valve plug (key 2) until it wedges tight at the end of the
valve stem thread.
CAUTION
Never use an old stem with a new valve plug. The use of an old stem requires drilling a new pin hole through the stem (or
adaptor, in case an ENVIRO-SEAL bellows seal bonnet is being used). This drilling weakens the stem or adaptor and may
cause failure in service. However, a used valve plug may be reused with a new stem or adaptor.
(24 strony)
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