Flowserve 51 Series Fire-Safe Valves - Manual (Page 9)

19406-H 9
Flow Control Division
Worcester Controls
occur without moving the pistons out of the actuator
body. This is important!
g. Install O-rings (15A) into and replace the actuator end
caps, (5A & 5B), noting that the “foolproof” pin between
the body and end cap mates properly. See steps “j”
through “o” below for spring installation, before replacing
end caps.
NOTE: When installing the end cap O-rings, use a small amount of a
general purpose lubricant, such as petroleum jelly, to hold them in
place for ease of assembly and to avoid having them fall and get
pinched.
On Rev. R1 and earlier actuators, be sure O-ring is installed in groove
on end cap.
h. Replace the S.S. washer over the top shaft extension.
i. VERY IMPORTANT: Install the NEW shaft clip (15F) into
its mating groove on the top shaft extension. (The
removed shaft clip is not to be reused.)
Place the numbered side up on the shaft clip and be
certain the clip is fully seated in its groove. See note on
bottom of page 8 for installation of spiral ring shaft clip,
which newer rebuilding kits will contain.
j. Replace springs in end cap. Ensure that the springs are
replaced in their identical position in the end cap from
which they were removed. For Rev. R2 and later actuators
use three (3) springs on a diagonal. For Rev. R1 use eight
(8) springs around the outside pockets.
k. If the actuator is being repaired due to a failed spring,
REPLACE all the springs in this actuator, as well as any
other parts which may have been damaged.
l. When replacing the springs, place the springs in the end
cap pocket after thoroughly lubricating each spring. Be
generous!
m. With the springs pointing up and the end cap on a solid
surface, place the actuator body over the springs and the
proper end cap. (Each end cap can only be mounted to
just one end of the actuator body.)
n. Force the body down and begin by engaging two end cap
screws (SC) by hand through the end cap. Take each end
cap screw up in SMALL and EQUAL turns. Once the end
cap is temporarily secured to the body, turn the actuator
over to its normal position and uniformly take up the four
end cap screws.
Uniformly load all springs to prevent any spring from
buckling.
IMPORTANT: Locating nibs are permanently cast into the Rev. R1 (all
sizes) and the Rev. R3 thru R6 (sizes 25-35) actuator piston face. The
actuator springs must fit over these locating nibs on the piston face.
Care in following the above instructions will ensure the proper
alignment of the spring in the actuator body and proper contact with
the piston face and end cap.
o. In a similar manner, as written in the previous steps,
replace the springs in the other end of the actuator body.
p. If solenoid block was removed:
Place gasket (9) on solenoid control block (7) and attach
block securely to end cap to obtain a seal at gasket.
NOTE: If fiber gasket is used, work a generous amount of
assembly grease or vaseline into the gasket prior to
assembly (wipe off excess grease). If a rubber gasket is
used, do not apply any grease, it must be installed dry.
q. Replace the position indicator (17) of the positioner (if
used). Locate position indicator on center gear (shaft)
flats. Press firmly until location nibs snap into recess on
pinion.
NOTE: Check that indicator, when located on center gear (shaft), will
show correct indication. Indicator is set up to show valve closed on
in-line mounting, i.e., pistons together on actuators.
Figure 1 Figure 2