Flowserve 45 Series Worcester Controls - Manual (Page 2)

2 18484-F
B. OPERATION
1. The operation consists of turning the handle and/or stem 1 /
4
turn
clockwise to close and 1 /
4
turn counter-clockwise to open. When stop
plate pointer and/or stem flats or groove is in line with the pipeline,
the valve is open. This valve may also be automated.
2. Worcester valves will provide bubble-tight shutoff when used in
accordance with Worcester’s published pressure/temperature ratings.
Valves with “G” seats meet the leakage rates of ANSI B16.104 Class VI.
3. It is not good practice to leave a ball valve partly open (throttling
operation) without knowledge of the pressure drop and flow at that
position. This information can be obtained from the factory.
4. As shipped from the factory, valves (except oxygen prepared (V20,
V33 or prefix code “x”) and valves with V38 or V46 option) contain a
silicone-based lubricant. This is for break-in purposes and may be
removed with a solvent if found to be objectionable for a particular
application. Lacquer thinner will remove the lubricant. “A” or “G”
(filled metal) seated valves should not be operated without a break-in
lubricant.
5. Media which can solidify, crystallize or polymerize should not be
allowed to stand in valve cavities.
6. Torque Requirements: Operating torque requirements will vary
depending on the length of time between cycles, line pressure, type of
valve seats, and the media in the system. For a detailed analysis of
valve torque requirements, see the Worcester Actuator Sizing Manual.
C. MAINTENANCE
If seepage is noted at stem, tighten retaining nut 1 /
6
turn at a time until
seepage stops.
CAUTION: Excessive tightening causes higher torque and shorter
stem seal life.
D. REBUILDING
a WARNING: BALL VALVES CAN TRAP PRESSURIZED FLUIDS IN
BALL CAVITY WHEN CLOSED.
Special handling and cleaning procedures are necessary for oxygen and
vacuum service valves. Refer to industry practices when overhauling
these units.
If the valve has been used to handle hazardous media, it must be
decontaminated before disassembly. It is recommended that the
following steps be taken for safe removal and disassembly:
• Relieve the line pressure. Operate the valve prior to attempting
removal from line.
• Place valve in half open position and flush the line to remove any
hazardous material from valve body.
• All persons involved in the removal and disassembly of the valve
should wear the proper protective clothing such as a face shield,
apron, etc.
1. A standard repair kit may be ordered for these valves consisting of
seats, seat back seals (for use with “A” or “G” seats only), body
seals, thrust bearing stem seal(s), and Belleville washers (used with
graphite stem seal or V51 option only.) Specify the valve size and
series, the material of the seat and body seal and the “R” number
(Revision No.) of the valve or for non-standard valve, the “P”
number, “T” number, “C” number or similar number. The information
is found on either the stop plate, mounting bracket nameplate or the
nameplate on the valve body. Some Series, such as PT, AF and V51
option have their own repair kits, which are ordered by the prefix or
adding V51 suffix. If valve body is stainless steel, place a “6” after
valve size in repair kit ordering code.
NOTE: The V51 high-cycle stem packing option can not be used with AF
Series, or oxygen service valves, or valves with “X” or “G” seats.
Repair Kit Ordering Examples:
3" RK 45 RT R2
3" RK 59 PT R2 V51
4" RK 45 PT TO914
2" 6AF RK59 PZ RO
CAUTION: If the seats and seals installed differ from those
removed, the valve nameplate or stop must be replaced or
remarked to indicate the altered materials and ratings or valve
tagged to so indicate.
2. Disassembly of Valve:
a. Place valve in open position. Remove all body nuts and bolts or
studs and lift out center section from between pipe ends. The 2"
AF59 valve requires spreading the pipe ends to clear the pipe end
centering rings. Remove handle assembly (if any) by unscrewing
hex head screw.
b. With valve in closed position, remove old seats, seat retainer(s) (if
present), seat back seals (if any), body seals and ball.
c. Prevent stem from turning by holding inside body. (The ball can
be inserted and prevented from rotating with a non-metallic rod
such as a screwdriver handle. This will hold the stem stationary
without damaging the ball.)
d. Remove retaining nut, and stop (or spacer, if actuated valve) from
stem.
e. Push stem into body cavity and remove. Retain follower and
centering washer(s). There are no washers on 2" and 2 1 /
2
" valves.
f. Remove and discard stem seal(s), stem seal protector (if any) and
thrust bearing, which may be stuck on the stem or in the body
cavity. Remove Belleville washer(s) (if any).
3. Visual Inspection:
a. The ball and the surfaces against which the seats and seals are
installed should be clean, undamaged, and free of pit marks and
scratches. Light marring from the action of the ball against the seats
is normal and will not affect the operation of the valve. Visible
tracking is normal. Tracking which can be felt is a potential problem.
b. The stem and body surfaces that the thrust bearing and stem
seals contact must be undamaged, clean, and free of pit marks
and scratches.
Flow Control Division
Worcester Controls