V DISASSEMBLY & ASSEMBLY
DISASSEMBLY
NOTE: If complete disassembly becomes necessary,
replacement of all seats and seals is recommended.
a) Follow the instructions in the warning section.
b) Remove valve from line. The valve should be in
the closed position for disassembly.
c) Remove the handle and spring.
d) Remove the packing nut (right hand thread).
e) Remove seat retainer nut with special tool.
(available from Velan).
f) Place the valve on a table in a vertical position
with seat retainer end side down.
g) Push the ball out of the body. If necessary tap the
ball using soft material to remove it.
h) Remove stem by pushing it into the body, then
remove and discard the old packing and the thrust
washer
(see exploded view for details)
.
i) With a screwdriver, carefully push the seats out of
seat area.
NOTE: Do not scratch body in the seat area.
ASSEMBLY
a) Clean and inspect all parts for damage and change
any parts if in doubt. If possible, use a lubricant
which is compatible with fluid in the line for
smoother operation.
b) Insert new seat in body and push it down using
the ball to avoid damage to seat ball contact area.
c) Install thrust washer on stem.
Then install stem in valve.
d) Install new packing rings, tighten packing nut and
reinstall spring & handle.
e) With handle in closed position carefully slide ball
in place with bore in closed position.
f) Install seat in the body end so that the sealing face
of the seat is towards the ball.
g) Apply PTFE paste or a lubricant to the body and
insert threads. Screw the insert into the body until
a metal-to-metal contact is achieved. Tighten the
seat retainer to the required torque as shown in
Table 1.
h) Cycle the valve twice to ensure permanent
position of the ball between the two seats.
PRINTED IN CANADA VEL-BVEE-97
ITEM QTY PART NAME
1 1 Body
4 1 Stem
5 1 Ball
6 1 Thrust washer
9 2 Seat
10 1 Packing washer
13 3 Packing ring
ITEM QTY PART NAME
30 1 Handle nut
31 1 Locking device
33 1 Handle
46 1 Coil spring
50 1 Packing nut sleeve
62 1 Packing nut
71 1 Seat retainer
VELAN, INC
2125 Ward Avenue
Montreal, Quebec
Canada H4M 1T6
Tel: (514) 748-7743
Fax: (514) 748-8635
VELAN VALVE CORPORATION
18 Avenue "C", Griswold Industrial Park
Williston, Vermont USA 05495-9798
TABLE 1 Recommended seat retainer torques
