Bray 7000_8000 Series - Manual (Page 2)

Installation and Maintenance Manual
Series 7000 and 8000 Ball Valves
Date: August 2011 / Page 2 of 9
®
A Subsidiary of BRAY INTERNATIONAL, Inc.
FLOW-TEK, Inc. Tel: 832.912.2300 © 2011 Flow-Tek, Inc.
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Houston, Texas 77041 www.flow-tek.com
the valve end being tightened. Do not tighten by
applying torque to the opposite end cap or other
valve component. Tightening by using the valve
body, handle or the opposite end cap can seriously
damage the valve; Use a wrench on both the near
end cap and pipe to avoid applying torque to the
body through the bolting.
3. In some applications, threaded end valves may be
back-welded on site. Use caution. Do not overheat the
valve body. Confirm that the end cap bolt holes are
aligned with the body screw holes on both ends and
that the end caps are parallel and correctly spaced
to fit the valve body before re-assembly or back
welding. Make up both of the threaded connections
normally and then remove the body assembly as
described below for weld-end connections before
back welding the threaded connection.
4. Do not use the body screws to pull the pipe ends
together or into alignment.
INSTALLATION OF WELD-END VALVES
(7200, 7300, 8200 & 8300 Series)
Insure that weld procedures are implemented that are
compatible with the materials used.
1. Tack weld the valve to the pipe at four points on
both end caps.
2. With the valve in open position, (the valve is in
the open position when the handle is parallel to
the axis of the valve and pipe), loosen all body
bolts, take the body out.
3. Turn the handle in the half open position. Remove
the seats and body gaskets.
4. Turn handle in closed position and remove ball.
5. Place all removed parts in a clean and secure place.
6. Replace the body and all bolts and tighten them
slightly. This operation is very important, so that
the body and end caps remain perfectly parallel,
thus preventing any leakage at the body joint
after welding.
7. Finish welding both end caps onto the pipe.
8. When cool, remove the body, clean end caps,
and reassemble per instructions below.
9. Place body between the two end connections;
then replace all bolts and cross tighten.
10. (See table 1. Tightening torques for end cap
screws).
INSTALLATION OF EXTENDED WELD END VALVE
Insure that weld procedures are implemented that are
compatible with the materials used.
1. Butt weld valves with 3 inch or longer extended
weld ends do not require disassembly for installation
welding.
2. Ensure that ball is in the full open position, and
perform normal welding procedures, using care
that the valve body does not reach a temperature
above 200°F. Use temperature measuring crayons
to monitor body temperature if needed.
4. DISASSEMBLY & CLEANING PROCEDURES:
CAUTION: Line must be depressurized before
disassembly. Valve should be cycled after draining the
system to relieve any pressure trapped in valve cavity.
Ball valves can trap pressurized media when closed.
Flush line with valve 1/2 open to remove hazardous
media. If the valve has been used to control hazardous
media, it must be decontaminated before disassembly.
WARNING: DO NOT attempt to remove packing
components or any other valve parts while line is
under pressure!
CAUTION: Properly support the valve before removing
or loosening any body bolts. The larger sizes are heavy
and may cause injury if allowed to swing or fall freely.
Remove actuation air and power connections and
confirm that there is no stored energy in the actuation
such as compressed springs or trapped air before
beginning. Stored energy devices can cause serious
injury if the energy is released without warning.
DISASSEMBLY FOR STEM AND SEAL SERVICE:
1. It is not necessary to remove the flanges from the