TM 55-4920-428-13
In the low-pressure circuit, the flow is through flow limiter valve VR9 and LOW PRESS REGULA-
TOR valve VR7 to LOW PRESS gage G2. Low pressure reducing valve VR6 bypasses flow to return as
required to prevent pressure from exceeding 300 psig. This valve is manually adjustable. Flow
continues in the low-pressure circuit to two selector valves: RETURN SYS1 VR1 and RETURN SYS2
VR2. The flow from these valves is directed to the ILCA manifold. At RETURN, these valves allow
flow through [he two preset (60 psig) back-pressure check valves through the variable area RETURN
SHUTOFF VALVE VR3, through the 3 to 5 psi check valve to the return line. Normally closed LOW’
PRESS RELIEF VALVE VR8 relieves trapped pressure from the regulated supply to return at shut-
down. The variable area CASE VENT LINE PRESS shutoff valve VR5 permits positive shutoff of flow
to the auxiliary port and the short length of flex hose.
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