Instruction Manual Supplement
D104372X012
Large EH
August 2018
4
10. Install two ½”-13 UNC-2A eye bolts or hoist rings with a minimum threaded length of 3/4 inch into the tapped holes
in the top of the cage and carefully lift it out of the valve body. Attach rigging equipment capable of lifting 800 lb to
the eyebolts. The seat ring will be removed with the cage as an assembly due to the seat ring being screwed into the
bottom of the cage and secured with tack welds. If the cage is stuck in the valve, use a rubber mallet to strike the
exposed portion of the cage at several points around its circumference. Set the parts on a protective surface to
prevent damage to gasket or seating surface.
11. Remove and discard the lower cage gasket.
12. Using the below procedure, disassemble the seat ring from the cage:
a. Carefully pry or cut out the seat ring seal ring from its groove in the seat ring. Discard the old seat ring seal ring.
b. Grind or file off the tack welds that prevent the seat ring from unscrewing from the cage.
c. There are 9/16 inch slots cut in the seat ring. Insert a bar through the slots and turn seat ring counter-clockwise
to unscrew it from the cage.
d. Set the seat ring on a protective surface taking care not to damage the seat ring seal ring surface.
13. Inspect all parts for wear and damage that would prevent proper operation of the valve. All gasket surfaces on the
trim parts and in the body must be cleaned of any residue and must be free from nicks and scratches. The seating
surfaces of the valve plug and seat ring need to be free from nicks, scratches, or any other damage for proper shut
off. Replace or repair trim parts as appropriate.
Valve Plug Maintenance
For information concerning the proper repair and maintenance of the valve plug/stem assembly please reference the
section of EHD and EHT valve plug maintenance in the Large EH Instruction Manual (
).
Trim Replacement
After all trim maintenance has been completed; reassemble the valve by following the numbered steps below. Be
certain that all gasket surfaces have been cleaned well.
1. All gaskets must be new to ensure proper valve operation. This valve assembly requires two flat sheet gaskets.
Observe all warnings and cautions in the Large EH Instruction Manual (D100392X012).
CAUTION
This valve uses special fluorocarbon-coated bolting. The fluorocarbon coating on the bolting must be inspected for damage
each time the body-to-bonnet bolting is loosened. If the fluorocarbon coating is damaged, it is recommended that the
bolting be replaced or contact Emerson for the appropriate bolt torque value. Reassembling the body-to-bonnet bolting
with damaged fluorocarbon-coating will require higher assembly torque to prevent leakage and to ensure proper valve
operation.
2. Orient the cage and seat ring so the threads on each are facing one another for assembly. The bottom of the cage
should be facing the top of the seat ring.
3. Using a bar inserted through the slots on the seat ring, turn the seat ring clockwise into the cage until tight.
4. Tack weld the seat ring to the cage using minimal heat. Two welds, 1/4 inch long and 180 degrees apart are
required.
CAUTION
To avoid damage to the seal ring, slowly and gently stretch it for the following procedure. Avoid pulling sharply on the ring.
