 |
|||
|
|
|||
| ||||||||||
|
|  MIL-V-19067A(ASG)
TABLE III
TLeakage
4.4.6 Operational - Operational tests shall consist of Checking time and Cracking
pressure. These tests shall be conducted within a temperature range of 70 to 120F.
When included as part of another test, the temperature specified in the paragraph
describing such test shall apply.
4.4.6.l Checking time - The valve poppet shall be mechanically actuated to its
full-open position against a static-fluid head of 5 psi maximum; it should then be
allowed to check before the static head of fluid decreases to 1 psi minimum. The time
between the release of the poppet and the cessation of fluid flow shall be the checking
time and shall not exceed l-1/2 seconds.
4.4.6.2 Cracking pressure - Gradually increasing pressure shall be applied in
the free-flow direction beginning with zero pressure. Cracking pressure Shall be
observed and shall be not less than 2 psi or greater tnan 8 psi. Cracking pressure is
defined as that pressure at which fluid is bypassed through the valve.
4.4.7 Pressure drop - This test shall be perfomed at a fluid temperature of
100F. Pressure drop in both directions through the check valve shall be measured at
a flow equal to the rated flow capacity. The fluid flow shall be accurately maintained.
A manometer connected across the check valve may be used for accurate measurement of the
pressure drop. The pressure drop through the valve shall not exceed the values specified
in table IV. The test in the free-flow direction shall be made with the valve handle
or plunger initially set at the closed position.
TABLE IV
Maximum pressure drop
7
|
|
Privacy Statement - Press Release - Copyright Information. - Contact Us |
Click
here for thousands of PDF manuals