TITLE:
NO.:
KEROTEST MODEL-1
REV.: 10
GATE VALVE
DATE: 7/12/07
OPERATIONS MANUAL
PAGE: 32 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
.
CRITICAL TORQUE
Excessive or unlimited torque will ultimately cause a structural failure of the valve. The chart
below indicates the minimum torque value where valve failure will occur.
CRITICAL TORQUE (FT.-LBS.)
Valve Size
Maximum
Operating Torque
Overtorque
Till Failure
Safety Factor
1"
50
130
2.6
1-1/4"
50
130
2.6
2"
60
309
5.2
3"
70
309
4.4
4"
75
350
4.7
6"
125
735
5.8
8"
150
735
4.9
10"
210
1170
5.6
12"
280
1170
4.2
16"
450
3700
8.2
For Venturi Valve: 2" X 1-1/4" Read 1-1/4"
3" X 2" Read 2" and Etc.
