MIL-DTL-19068B
3.12 Performance requirements.
3.12.1 Fluid immersion. The shuttle valve shall not leak, malfunction, or be damaged
after immersion continuously for 72 hours in fluid conforming to MIL-PRF-83282,
MIL-PRF-5606, or MIL-PRF-87257 as specified in 4.6.2.
3.12.2 Proof pressure. The valve shall not leak, fail, or be permanently damaged after
being tested with the proof pressure test as specified in 4.6.3.
3.12.3 Washout. The valve shall not leak more than 10 drops [0.5 cubic centimeter (cc)]
per cycle from the open inlet port when tested as specified in 4.6.4. No washout of packing or
malfunctioning of any part of the valve during and after the test.
3.12.4 Leakage and shuttling with fluid. The valve shall be designed not to leak more
than 0.132 ounce (3 cc) with a single shuttling operation when tested as specified in 4.6.5. The
valve shall shuttle between 25 and 100 psi. The valve shall also meet the leakage requirements
when tested with the pressures specified in 4.6.5.
3.12.5 Air pressure shuttling and leakage. The free air leakage shall be not greater than 5
cubic inches per minute when tested with air pressure specified in 4.6.6. The valve shall not be
damaged or malfunction after the test.
3.12.6 Extreme temperature functioning.
3.12.6.1 Low temperature functioning. The valve shall not leak or malfunction when
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tested with the fluid at 65 F temperature as specified in 4.6.7.1. The shuttling pressure shall be
between 25 and 100 psi.
3.12.6.2 Rapid warm up. The valve shall operate without leakage after warming up from
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65 to +275 F and shall shuttle satisfactorily between 25 and 100 psi when tested as specified in
4.6.7.2.
3.12.6.3. High temperature functioning. The valve shall function with the hydraulic oil
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at +275 F and shall shuttle without leakage when tested as specified in 4.6.7.3.
3.12.7 Impulse cycling. The valve shall not leak internally more than 20 drops (1 cc) per
100 cycles when tested as specified in 4.6.8. There shall be no external leakage. The valve shall
not be damaged or malfunction during or after the test.
3.12.7.1 Impulse cycling at high temperature. The internal leakage of the valve shall not
be greater than 20 drops (1 cc) per 100 cycles when tested as specified in 4.6.8.1 with the
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temperature at +275 F. The external leakage shall be zero. The valve shall not be damaged and
shall shuttle satisfactorily at that temperature.
3.12.7.2 Impulse cycling at intermediate temperature. The internal leakage of the valve
shall not be greater than 20 drops (1 cc) per 100 cycles when tested as specified in 4.6.8.2 with a
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