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Pressure relief and check valves |
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|  MIL-52851(ME)
3.8.6 Automatic oil discharge system. Unless otherwise specified (see
6.2), the automatic oil discharge cycle shall be controlled by capacitance-
type probes in the prefilter and first coalescer stages. The two oil dis-
charge valves and the water discharge valve shall be solenoid-controlled
air valves that can be adjusted to prevent instant opening and closing of
the valves. All automatic valves in the oil discharge system shall be
normally closed when the air supply or electrical power is turned off or
otherwise fails.
3.8.7 Filter-coalescer elements. The filter-cod.ester elements shall be
the standard expendable military element, Type IIII conforming to MIL-F-52847.
3.8.8 Prefilter elements. Unless otherwise specified (see 6.2), the
prefilter elements shall be the standard expendable military prefilter,
Ty. e II (inside-to-outside flow), conforming to MIL-F-52847.
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3.8.9 Identification marking. Unless otherwise specified (see 6.2), the
separator shall be identified with an identification plate conforming to
Figure 1, and attached to the prefilter vessel between the oil discharge
line and the sight gage. The plates shall be attached to the vessel using
adhesive conforming to MMM-A-1617, Type III.
3.8.10 Instruction plates. Unless otherwise specified (see 6.2),
instruction plates conforming to Figure 2, and a warning plate conforming
to Figure 3 shall be attached to the separator vessels as follows: "INLET"
on the prefilter vessel directly above the inlet pipe; "OUTLET" on the
second coalescer vessel directly above the outlet pipe; "WARNING" directly
below the oil discharge valve on the first coalescer vessel; and "INSTRUCTIONS"
plate directly below the oil discharge valve on the second coalescer vessel.
The adhesive specified in 3.8.9 shall be used for attaching all plates to
the vessels.
3.8.11 Pressure relief and check valves. Unless otherwise specified
(see 6.2), a pressure relief valve shall be installed in the supply pump
discharge line. The pressure relief valve shall be set to open at 50 plus
or minus 5 psi. The bypass from the pressure relief valve shall. be plumbed
into the suction side of the supply pump. Unless otherwise specified (see
6.2), the system shall also include check valves ahead of the supply pump,
after the automatic water discharge valve, and at the end of the oil dis-
charge Line on the second coalescer vessel.
3.8.12 Treatment and painting
The portions of the system normally
painted shall be cleaned, treated, and painted in accordance with MIL-T-704.
Type B. The color shall be equipment gray in accordance with JAN-P-700.
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