Flowserve V-377 R4 Edward Valves - Manual (Page 34)

Flow Control Division
Edward Valves
19. Screw 1/2”-13 bolts (3/8”-16 on
sizes 5” and smaller) into the thread-
ed bosses or nuts provided in the pis-
ton. The piston now can be lifted
from the valve. Occasionally, a vacu-
um may be formed by the cooling
fluid in the pipe line below the valve.
Until relieved, this vacuum will pre-
vent removal of the piston. Since the
piston must be removed through the
pressure-seal area of the bonnet
bore, use caution to avoid marring
the sealing surface in any way.
20. The bonnet end opening should be
kept covered whenever possible.
Type II Pressure-Seal Bonnets – Stop
and Stop-Check (Non-Return) Valves
with Non-Revolving Stems
See Illustration No. 23 on page 31.
*1. Mark the body, yoke and yoke lock
ring with prick punch marks so that
the parts can be reassembled in their
original position.
*2. Remove the yoke lock ring studs and
nuts.
*3. Remove the yoke lock ring using a
small pry bar to separate the halves.
*4. Loosen the stem guide collar lock nut,
back off the stem guide collar lock
screw, and remove the stem guide
collar key.
*5. Turn the crossarm in a direction to
close the valve, thus unscrewing the
yoke from the stem. The stem must be
restrained from turning; a flat tool
held in the stem guide collar key slot
is convenient, being careful not to
damage the slot.
*6. If the valve is installed with its stem
other than vertical, attach the chain
hoist to the yoke in such a manner as
to permit rotation of the crossarm.
*7. With the chain hoist, lift the yoke
assembly clear of the stem and body
assembly, simultaneously slipping the
stem guide collar off the stem.
8. Mark the bonnet, bonnet retainer
ring, and body with adjacent prick
punch marks so that their relative
position can be duplicated in
reassembly.
9. Remove the gland bolt nuts and
gland.
10. Place an eyebolt in the threaded end
of the stem.
Disassembly Procedures for Bonnet Types
(continued)
Illustration No. 24
Type III Bonnet on Stop Valve
SHOWN WITH
IMPACTOGEAR
34