Bray Cryogenic - Manual (Page 2)

Installation and Maintenance Manual
Multiport Threaded and Weld End Ball Valves
Date: August 2011 / Page 2 of 6
®
A Subsidiary of BRAY INTERNATIONAL, Inc.
FLOW-TEK, Inc. Tel: 832.912.2300 © 2011 Flow-Tek, Inc.
8323 N. Eldridge Pkwy #100 Fax: 832.912.2301
Houston, Texas 77041 www.flow-tek.com
other valve parts while line is under pressure!
Stem seal leakage may be corrected without
disassembly by tightening the packing gland nut until
such leakage stops. If the leakage continues or valve
operating torque becomes excessive, the seals are
worn and replacement will be necessary.
If the valve has been used to control hazardous media,
it must be decontaminated before disassembly.
It is recommended that the following steps be taken
for safe removal and assembly.
As shipped from the factory, Valves may contain non-
Silicone based lubricant. This is for break-in and may
be removed by disassembly and solvent washing, if it
is objectionable for a particular application,
6. DISASSEMBLY FOR EXTENDED STEM AND
SEAL REMOVAL:
1. Remove flange connections and lift valve from
line for servicing.
NOTE: Care should be taken to avoid scratching
or damaging mating faces.
The valve should be adequately supported and in
the open position before beginning.
2. Loosen handle set screw and remove handle and
stop plate. Next, remove gland nuts, gland flange
and gland.
3. Remove body end cap screws, using proper
wrench size. Lift off body end. One seat should
come out with body end.
4. Repeat the removal procedure for the other flange
end. Take out other seat.
5. To remove the ball, rotate the stem so ball is fully
closed. Lift the ball from body, using a strap and
lift device if necessary. NOTE: Extreme caution
should be taken to avoid damage to the ball.
6. Remove the mounting screws holding the extended
body to the valve top plate. Remove the extension
and stem components from the top plate of the valve.
7. The stem must be removed from inside the
extended body - a tap on the top of the stem
should loosen it. The thrust washer should come
out with the stem. Then remove the stem packing.
7. VISUAL INSPECTION:
Clean and inspect metal parts. It is not necessary
to replace the ball and stem unless the seating
surfaces have been damaged by abrasion or
corrosion. Replacement of all soft parts is strongly
recommend whenever the valve is disassembled for
reconditioning. This is the surest protection against
subsequent leakage after valve assembly.
The replacement parts can he ordered in kit form.
NOTE: The valve may be assembled and operated
dry where no lubricants are allowed in the system;
however, a light lubrication of mating parts will aid
in assembly and reduce initial operating torque.
Lubricant used must be compatible with the intended
line fluid.