TITLE:
NO.:
KEROTEST MODEL-1
REV.: 10
GATE VALVE
DATE: 7/12/07
OPERATIONS MANUAL
PAGE: 26 OF 35
This report is the property of Kerotest Manufacturing Corp. 5500 Second Avenue, Pittsburgh, PA 15207 and may not be
copied by any means without the expressed written consent of Kerotest. It is intended for the sole purpose of helping
Kerotest customers evaluate Kerotest products and may not be released to any third party or otherwise used in any
manner injurious to the interests of Kerotest
.
ZERO PRESSURE REPACKING PROCEDURE – LATEST DESIGN
WITH STEM WEATHER SEAL (AFTER 1987)
CONDITION 3 – VALVE UNDER ZERO PRESSURE
(REFER TO DRAWING ON PAGE 27)
1.
Close valve tightly with wrench.
2.
Remove nut (1) and operating square (2).
3.
Remove all cap screws (3) and gland (4). Remove weather seal o-ring (5). (Upper
thrust washer (7) may remain in gland (4) or on stem (11).)
4.
Rotate stem (11) in same direction as closing the valve until it is free from the wedge.
Withdraw stem from valve. (Lower thrust washer (13) may remain in the cover or on the
stem (11).)
5.
Remove top packing adapter (8), v-rings (9), and lower packing adapter (10).
6.
Replace lower thrust washer (13) in cover if removed.
7.
Lubricate new parts with light oil and insert in packing chamber as follows: Lower
packing adapter (10), v-rings (9), and top packing adapter (8).
8.
Insert stem (11) in cover and rotate slowly by hand in the direction for opening valve.
Continue rotation until stem shoulder (12) contacts lower thrust washer (13).
9.
Check if upper thrust washer (7) is in place. Install weather seal o-ring (5). Position
gasket (6) and gland (4), with weather seal lead-in chamfer side down, on cover, being
careful not to cut o-ring. Insert cap screws (3) fully and tighten to torque shown in Table
I. Place operating square (2) on stem and then secure with nut (1).
Valve is ready for service.
