MIL-P-19692E
differential pressure between case drain pressure and inlet pressure as
specified in the detail pump specification. Minimum and maximum case drain
flow shall be specified in the detail pump specification under conditions as
specified in the detail pump specification.
3.3.6 Rated temperature. The rated temperature of the pump shall be the
maximum continuous fluid temperature at the inlet port of the pump.
3.3.6.1 Maximum system temperature. The rated temperature is related to
the maximum temperature of the hydraulic system in which the pump is to be
used according to table II and shall be one of the values listed herein. It
shall be specified in the detail pump specification.
3.3.6.2 Minimum fluid temperature. The minimum continuous fluid
temperature at the pump inlet port is not related to the rated temperature by
this specification. A minimum continuous fluid temperature, if required,
shall be specified in the detail specification.
Temperature relationship.
TABLE II.
3.3.7 Displacement. The displacement of the pump shall be the
theoretical volume of the hydraulic fluid delivered in one revolution of its
drive shaft. It shall be expressed as cubic inches per revolution (CU in/rev)
or milliliters per revolution (ml/rev). The displacement of any pump model
shall be determined by calculation from the geometry and dimensions of the
pump. The effects of allowable manufacturing tolerances, deflections of the
pump structure, compressibility of the hydraulic fluid, internal leakage and
temperature shall be excluded from the calculation because the displacement is
intended to be an index of the size of the pump rather than of its
performance.
3.3.8 Rated flow. The rated flow of the pump shall be the measured
output of the pump under conditions of rated temperature, rated speed, rated
inlet pressure and maximum full-flow pressure, using the hydraulic fluid
specified in the detail pump specification. It shall be expressed as
compressed flow in U.S gallons per minute (gpm) or liters per minute (l/rein),
and its value shall be specified in the detail pump specification.
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