Instruction manual

Instruction Manual
D500240X012
A31A Valve
October 2012
9
Figure 3. Available Seal Configurations
B2334-1
1
NOTE
FOR OPTIMUM SEAL PERFORMANCE, THE PREFERRED VALVE ORIENTATION AT SHUTOFF IS WITH THE RETAINING RING DOWNSTREAM FROM THE HIGH PRESSURE SIDE OF THE VALVE.
BACKUP
RING
BACKUP
RING
RETAINING
RING
RETAINING
RING
RETAINING
RING
RETAINING
RING
SEAL RING
METAL
SEAL RING
NOVEX
SEAL RING
GRAPHITE
GASKET
GRAPHITE
GASKET
GRAPHITE
GASKET
HIGH PRESSURE
AT SHUTOFF
HIGH PRESSURE
AT SHUTOFF
HIGH PRESSURE
AT SHUTOFF
HIGH PRESSURE
AT SHUTOFF
BODY
BODY
BODY
BODY
VALVE DISK
VALVE DISK
VALVE DISK VALVE DISK
T-SLOT
CRYOGENIC
SEAL RING
RESILIENT INSERT
SOFT SEAL WITH
BACKUP O-RING
CRYOGENIC SEAL
NOVEX SEAL
PHOENIX III
FIRE-TESTED SEAL
Installing Wafer-Style Valves
WARNING
The edges of a rotating valve disk have a shearing effect that may result in personal injury. To avoid personal injury, keep
clear of the disk edges when rotating the disk.
1. Seefigure5forrecommendedvalveorientation.Seetable5forflangeboltspecifications.Installthelowerflange
bolts first to form a cradle for the valve.
2. Properly orient the valve according t o the specific application. For optimum performance, install the valve so that
theshaftwillbeonthehighpressuresideofthevalveatshutoff.Installthevalveandthegasketsbetweenthe
flanges into the cradle formed by the flange bolts.
3. Install the remaining flange bolts, making sure to center the gaskets on the gasket sealing surfaces of the flange
and body.
4. Tighten the flange bolts in an alternating criss-cross fashion to a torque value of one-fourth of the final bolting
torque. Repeat this procedure several times increasing the torque value each time by a fourth of the final desired
torque. When the final torque value has been applied, tighten each flange bolt again to allow for gasket
compression.
5. For hazardous atmosphere or oxygen service valves, read the following Warning, and provide the bonding strap
assembly mentioned below if the valve is used in an explosive atmosphere.