Emerson Yarway Instrukcja obsługi i konserwacji - Strona 3
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YarwaY hardseat and seatless tandem blow-off valve service and
operation manual
fiGure 3
seatless blow-off valve and gland packing
puller assembly
valve body
upper gland
upper packing
lower gland
lower packing
note: chisel marks on
head give indication of
direction of pawls when
inside valve body
a
a
edge of hole peened to
hold pin in place
head assembly interchange head assembly available
for either 1", 1¼", 1½", 2" or 2½"valves. order size or
sizes required.
head assembly fits all types of Yarway seatless
valves in size specified
hardSEaT SEaT VaLVE
ITEM
dESCrIPTION
1
bridge plate assembly
2
Jack screw
3
spring
4
thrust washer
5
nut 1¼ hex
6
screw (spring mtg.)
SEaTLESS VaLVE GLaNd aNd PaCkING
PULLEr
ITEM
dESCrIPTION
946458
packing puller w/box*
946459-01
1, 1¼ head assembly
946459-02
1½ head assembly
946459-03
2 head assembly
946459-04
2½ head assembly
NOTE:
* use for all size seatless bo valves. in addition order
appropriate size head assembly
INSTaLLaTION OF PaCkING rINGS
warNING
This procedure should not be attempted unless all
pressure has been vented from the valve and its
connecting lines, and the temperature of the valve
is at or near ambient.
Remove the stopscrew (13) yoke nuts and springs.
Turn the hand-wheel to open the valve. This will
raise the plunger. Turn the handwheel to close
the valve. This will raise the yoke. Turn the yoke so
that the holes and studs are out of line and turn
the handwheel to open the valve. The plunger is
thus withdrawn from the valve.
Next, remove the glands and the old packing.
This can be done by using a Yarway gland and
packing puller or similar tool (Fig. 3) in the
following manner: Insert the tool until the pawls
engage the ports in the lower gland. Tighten the
nut on the top of the puller to draw out the lower
gland, upper packing and upper gland. The lower
packing can then be removed using a hook tool.
Care should be exercised, however, so that the
lower packing groove is not damage. Install new
packing rings (Fig. 4 or 5) glands and stopscrew
in the body and replace the yoke, with the plunger
screwed all the way up on the stem, using the
yoke nuts to pull down the yoke assembly. Next,
place the springs under the nuts and adjust as
previously described.
fiGure 4
without support ring
upper gland
upper packing backup ring
upper packing ring
valve inlet
plunger
lower gland
lower packing ring
fiGure 5
with support ring
upper gland
upper packing backup ring
upper packing ring
valve inlet
plunger
lower gland
support ring
lower packing ring
3