Kerotest MODEL-1 - Page 40

TITLE:
NO.:
KEROTEST MODEL-1
REV.: E
GATE VALVE BONNET LEAK
DATE: 7/12/07
REPAIR PROCEDURE
PAGE: 5 OF 13
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.
A. Mainseat wedge up to double the amount of operating toque shown in Enclosure 4.
CAUTION: Only proceed if a tight enough seat seal is achieved to allow
subsequent work to be safely performed.
B. Remove bolts one at a time on each corner and install a section of all thread and nut
as shown below. At least 4 all threads are required per valve.
C. Tighten all thread nuts and remove remaining bonnet bolts
D. Start loosening the nuts evenly at each corner while applying a clockwise rotation
force to the valve actuator square. See chart below for exact number of turns for each
valve size.
Valve Size
Number of Turns
2"
1.5
3"
1.5
4"
2.5
6"
2.5
8"
3.0
10"
4.0
12"
4.0