SERIES 762 BIDIRECTIONAL SLURRY KNIFE GATE VALVES
Installation, Operation, and Maintenance Manual
15 of 30
© 2021 BRAY INTERNATIONAL, INC. ALL RIGHTS RESERVED. BRAY.COM The Information
contained herein shall not be copied, transferred, conveyed, or displayed in any manner that would
violate its proprietary nature without the express written permission of Bray International, Inc.
9.3.3 For pneumatically operated valves with a double-acting cylinder,
connect a closed airline to the upper actuator port and gradually
increase the air supply pressure to the rated pressure on the
nameplate to close the valve; repeat by connecting the airline to
the other port to slowly stroke the valve back to open position. If
movement with the rated air supply pressure is smooth, the valve
is ready to be put into service.
9.3.4 For valves with spring-return actuators, use the air port to stroke
the valve in one direction and release air slowly to stroke by
spring in the opposite direction.
9.3.5 Ensure that the valve is stroking fully between the
OPEN
and
CLOSED
indicators provided. Normal stroke lengths for the valves
are listed below in
Table 2
.
Table 2:
STROKE LENGTH
Size
(DN)
80
100
150
200 250 300 350 400 450 500
600
Stroke
(mm)
122
130
198
250
300
358
415
455
495
535
660
Size
(NPS)
3
4
6
8
10
12
14
16
18
20
24
Stroke
(in)
4.80 5.12
7.80 9.84
11.81 14.09 16.34 17.91 19.49 21.06 25.98
(continued)
