Flowserve 608 User Manual

Installation, Operation
and Maintenance
Instructions

Series 608 Ball Valve

CAUTION: Flowserve recommends that all
product which must be stored prior to installation
be stored indoors, in an environment suitable for
human occupancy. Do not store product in areas
where exposure to relative humidity above 85%,
acid or alkali fumes, radiation above normal
background, ultraviolet light, or temperatures
above 120°F or below 40°F may occur. Do not
store within 50 feet of any source of ozone.

b. With valve open, remove three body bolts,
loosen fourth and swing out body. Remove fourth
bolt and spread pipe ends Close valve, remove
ball, seats, body seals. Return body to its original
position and temporarily secure it with two body
bolts diagonally opposite each other.

c. Weld valve in line.
d. Allow valve to cool, reassemble valve. Install

new body seals, if they were shipped separately
from the valve. Temporary Buna body seals, if
found in the valve as received, are not to be
reused. If coated stainless steel “S” gasket body
seals are used (Code M or G), the wide flange of
the “S” gasket must face the valve body. See
View A-A detail on page 5.

e. Tighten and torque body bolts evenly and
diagonally opposite each other, alternating in a
criss-cross pattern. Use torque figures below:

1.0 INSTALLATION

1. 608 valves may be installed for flow or vacuum
in either direction. Use care to exclude pipe
sealants from the valve cavity. Valves with
upstream relief hole in ball (V3 option) are one­way valves.

2. Weld End Valves (TE, SW, BW): NOTE: Prior
to welding , THOROUGHLY CLEAN ALLJOINT
SURFACES to prevent contamination. Valves with
“PG”, “RG”, “XG”, “AG”, and “GG” seat and body
seal combinations and V67 option code are
compatible with welding temperatures. Therefore,
these valves are weld-as-is and do not have to be
disassembled to be welded in the line. These
valves will have a red welding tag attached. If
these valves are disassembled, the graphite­coated stainless steel gasket body seals and the
seat back seals (used with “A” or “G” seats only)
must be replaced. When welding these valves, the
ball must be open to prevent adhesion of weld
spatter to the ball. Use STICK or MIG welding,
and allow valve and joint to cool to the touch
between passes. For all other weld valves:

a. Tack weld valve in place.

Note: Stainless steel bolts and nuts are generally
used in all three-piece valves with stainless steel
bodies.

CAUTION: The fluoropolymer and UHMWPE
body seals (codes T and U), and the coated
stainless steel gaskets (codes M and G) make
excellent seals. However, some points of
caution in their use need emphasizing.

3.
a. No fluoropolymer or UHMWPE part (except a
seat) or seat back seal is reusable. Coated
stainless steel gaskets are also not reusable and
cannot be used in stainless bodies with cast
surfaces or serrations in body seal area. Upon
disassembly of the valve, these seals or gaskets
should be discarded and replaced with new parts.

b. Care must be taken to avoid scratching the
fluoropolymer or UHMWPE seals or the coating of
the stainless steel gaskets during installation.
Light lubrication of these seals can help to prevent
damage.

c. Care must also be taken when handling
graphite thrust bearing, stem seal, or seat back
seal. These parts can be easily damaged by
squeezing the O.D. of the seal. Parts are to be
handled on the flat surfaces rather than the O.D.

d. The ball used in valves with “A” and “G” (filled
metal) seats is round to special tolerances. To
ensure proper contact with the seat, do not drop,
dent or scratch the ball during handling. These
balls also have an anti-galling coating. DO NOT
use uncoated balls with filled metal seats.

2.0 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 the handle
and/or stem flats are in line with the pipeline, the
valve is open. These valves may also be
automated.

2. These valves will provide bubble-tight shut-off
when used in accordance with Worcester’s
published pressure/temperature chart. 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.

4. As shipped from the factory, all valves (except
oxygen prepared (V20, V33 or prefix code “X”),
and valves with V38 or V6 options) contain a
silicone-based lubricant. This is for break-in
purposes, and may be removed if it is
objectionable for a particular application by
disassembling and solvent washing. 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 ball
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
Worcester’s Actuator Sizing Manual.

3.0 OPERATION AND
MAINTENANCE SECTION

.0

1. Valves should be opened and closed slowly to
avoid hammering effect on the valve and pipeline.

2. Valve should be “fully open” or “fully closed” to
prevent damage to the seat and ball caused by
wire drawing.

3. This valve is intended for on-off service and
should not be used in throttling applications.

4. If a stem leak develops, tighten the gland nut
until the leakage has been stopped. If the stem
leak cannot be stopped, replacement stem
packing is available.

CAUTION: For maximum stem seal life, proper stem
adjustment procedure must be followed. Excessive
tightening causes higher torque and shorter stem
seal life.

When replacing the packing, be sure that the
valve is not under pressure. Remove all actuation
to give access to the packing. After loosening and
removing the gland nut, the packing can be
removed by means of a hooked wire or a special
purpose tool.

5. If a through leak occurs, ensure that the valve
is fully closed. If leakage persists, replacement
seats are available.

6. If a body seal leak develops, do not over tighten
the body end cover bolting. This may damage the
valve. Instead a replacement
seal should be installed.

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