Bray Cryogenic - Manual

Installation and Maintenance Manual
Multiport Threaded and Weld End Ball Valves
Date: August 2011 / Page 1 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
CRYOGENIC AND LOW TEMPERATURE SERVICE
TRIAD SERIES BALL VALVES
(FP2000/FP3000 and SP2000/SP3000 WITH CRYO OR LOW TEMP EXTENSION)
INSTALLATION - MAINTENANCE MANUAL
DESIGN
The extended stem assembly is designed to remove
the packing components and actuation from the cold
environment.
The three piece valve assembly allows for ease of
maintenance without special tools. These valves
feature a “free floating” ball. The ball is not fixed, but
is free to move with the line pressure. All valves are
provided with a vented ball and the flow direction
is indicated with an arrow. These valves should be
installed with the vented side of the ball upstream.
The valve is unidirectional in this configuration.
The downstream seat, opposite the pressurized side
of a closed valve, carries the load exerted by the
line pressure on the ball, while the upstream seat is
subject to little load or wear.
1. USE
The valve should be maintained as part of a
preventative maintenance program and in accordance
with Flow-Tek’s recommended pressure, temperature
and corrosion limits to ensure a long service life.
During shipment, storage, and in operation, the valve
should be fully open (“open” is preferred for shipping
and storage). Do not use in throttling service without
investigating flow and pressure conditions.
WARNING: Before installing this equipment, confirm
that it is suitable for the intended service.
The identifications tags describe the maximum
allowable service conditions for this product.
Be sure that the installation is protected by appropriate
pressure control and safety devices to ensure that
acceptable limits are not exceeded.
2. OPERATION:
Operation of the valve is done by turning the handle
a 1/4 turn (90 degree turn). Clockwise to close,
counter-clockwise to open.
A. VALVE OPEN POSITlON
The handle is parallel with the pipeline.
B. VALVE IN CLOSED POSITION
The handle is perpendicular to the pipeline.
Valves with actuators should be checked for actuator
-valve alignment. Misalignment will result in high
operational torque and damage to valve stem and seals.
3. STEM SEAL ADJUSTMENT:
1. For 1/2”- 2”, if slight leakage is noted at stem,
straighten lock washer tab, tighten stem nut to
flatten Bellville Washers, back stem nut off 1/4
turn, secure lock washer tab.
2. For sizes larger than 2”, simply tighten gland
bolts evenly until leak stops. Do not over tighten.
4. GENERAL INFORMATION FOR ON-SITE
INSTALLATION:
The valve must be installed in a horizontal piping run
with the stem vertical within +/- 25 degrees.
Before installing the valves, the pipes must be flushed
clean of dirt, burrs, and welding residues, or the
seats and ball surface will be damaged. See sections
9 thru 11 for installation details. Note direction of
flow arrow.
5. DISASSEMBLY & CLEANING PROCEDURES:
CAUTION: Line must be depressurized before
disassembly. Valve should be cycled to assure there is
no pressure is trapped in valve cavity. Ball valves can
trap pressurized media when closed. Flush line with
valve 1/2 open to remove hazardous media.
WARNING: DO NOT remove packing gland or any