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Page Title:
Table I. Thermal Relief Valve Pressure Range |
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|  MIL-V-5527A
(May 1951)
shall remain unaltered throughout the above series of tests. The valve shall then be
adjusted to deliver rated flow at the maximum pressure setting indicated in table I and the
above series of tests repeated. The adjustment of the valve shall remain unaltered through-
out this series of tests. Static cracking, dynamic cracking and reseat pressures shall be
determined for each rated flow pressure setting in conjunction with the above adjustments
or during the performance of the "static and dynamic leakage tests.
TABLE I
Thermal Relief Valve Pressure Range
4.5.4.1 Static cracking pressure is the minimum pressure at which fluid is by-passed
through the valve at the rate-of 0.1cc (approximately 2 drops) per minute during condi-
tions of increasing pressure supplied by means of a hand pump.
4.5.4.2 Dynamic cracking pressure is the minimum pressure at which fluid is by-
passed through the valve at a rate of approximately 5cc per minute during conditions of
increasing pressure supplied by means of a power-driven pump.
4.5.4.3 Reseating pressure is the pressure at which fluid is by-passed through the
valve at a rate of 1.5cc (approximately 30 drops) per minute during conditions of decreasing
pressure supplied by means of a power-driven pump. See figure 1 for relationship between
static and dynamic cracking pressure and reseating pressure.
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