Flowserve 51 Series Fire-Safe Valves - Manual (Page 4)

4 19406-H
Flow Control Division
Worcester Controls
1/2"-2" 51/52 Valves
a. Lightly lubricate the ball, seats, seals, seal protector (if used)
and thrust bearing(s) with a lubricant compatible with the
media being handled. White petroleum jelly is a good general
purpose lubricant.
b. On all but the 1 /
2
" size, the far seat can now be installed.
c. Place new PEEK thrust bearing protector (tan in color) and
new thrust bearing (carbon-filled, black in color or graphite,
metallic silver gray) on stem and insert assembly through
body cavity. The carbon-filled or graphite thrust bearing must
be used for proper grounding of stem to body.
d. Install new stem seal, which is a metallic silver gray color,
new stem seal protector (tan in color) and the old follower.
PEEK thrust bearing and stem seal protectors are placed
outside of seals and bearings. The seals/bearings must
contact the body. Thrust bearing and stem seal protectors are
the same size, tan in color and generally interchangeable.
Install two new Belleville washers with outer edges touching.
For actuated valves, which use a single self-locking stem nut,
place four new Belleville washers in position (two pairs of
washers with larger diameter sides touching each other).
Place retaining or self-locking stem nut on stem and using
handle or a wrench to prevent rotation, tighten nut to make
snug and firm. Follow Section C - Maintenance - for proper
stem adjustment.
e. Install far seat on 1 /
2
" sizes only.
f. Install one-piece handle and stop, lockwasher and handle nut,
if manual valve. Tighten handle nut securely to lock retaining
nut in place. (This step is not applicable to valve with self-
locking stem nut.)
g. Install ball, body seal, second seat and end plug. When end
plug and body are metal-to-metal, end plug face may project
up to .009" beyond surrounding serrated surface. End plug
must be fully tightened against machined step in body. If in
doubt, assemble end plug without seat and seal, make a
witness mark, and reassemble the full assembly.
h. If practical, check leak tightness before reinstalling valve in
line.
3"-4" 51/52 Valves
i. Lightly lubricate the ball, seats, body seal, stem seal and
thrust bearing with a lubricant compatible with media being
handles. White petroleum jelly is a good general purpose
lubricant.
j. To reassemble stem, disassembly procedure should be
followed in reverse order. Fire-rated valves use a graphite
stem seal, which is metallic silver gray and larger than the
black, carbon-filled fluoropolymer thrust bearing. This thrust
bearing must be used for proper grounding of stem to body.
A belleville washer is also added, concave side up, over
follower.
NOTE: FOR 3" and 4" ACTUATED VALVES HAVING A GRPAHITE STEM
SEAL AND BELLEVEILLE WASHER, A SECOND BELLEVILLE WASHER
IS USED. THE BELLEVILLES ARE INSTALLED WITH THE LARGER
DIAMETER SIDES TOUCHING EACH OTHER. THE STEM SPACER IS
DELETED AND NOT USED.
k. When stem assembly is complete, retaining nut should be
tightened to fully flatten Belleville(s), then backed of 1 /
6
turn.
Excessive tightening causes higher torque and shorter stem
seal life.
l. Insert new far seat in body. Make sure seat rests firmly on
back surface of recess.
m. With valve in closed position, insert ball into body so that
stem slot engages tang on stem.
n. Install and make sure body seal rests squarely on seal surface
of body.
CAUTION: If the body seal is installed in the end plug, it will be
damaged.
Insert new seat in cavity of end plug, and slide the end plug
into the body as far as it will go.
o. Secure end plug in place by threading in the end plug
retaining screws and tightening each one firmly. Proper
installation will allow no more than .010" protrusion of the
end plug beyond the valve body.
p. Replace handle assembly (wrench block and extension) and
tighten hex head screw (manual valves only ).
q. If practical, check leak tightness before installing valve in line.
r. Upon reinstallation of the valve in the line, retighten the end
plug retaining screws after the flange bolts are fully torqued
up.
Special Note: In order to maintain FM certification, it is essential when
reinstalling the valve into the pipeline that new spirataulic flange
gaskets and grade B-7 flange bolts be used.
II. 39S ACTUATOR
WARNING: Series 39 actuators are electro-mechanical devices
subject to normal wear and tear. Actuator life is dependent
upon application and environmental conditions. If applied in
hazardous services such as, but not limited to, media
temperature extremes, toxins, flammables, or other services
where improper or incomplete operation could produce a safety
hazard, it is incumbent upon the system designer and the user
to provide proper warning devices such as temperature
sensors, oxygen sensors and flow sensors. Flowserve also
recommends that the optional auxiliary limit switches be used
for monitoring and/or electrical interlock.