TM 5-3895-383-24
Oil from the vibratory pump flows through the relief valve (1) at
the passages (A). High pressure oil enters passage (A) and
the oil acts on the collars (4) and (7), The force of spring (6)
keeps the valve closed until the oil pressure in the high
pressure side of the main loop circuit reaches relief pressure.
After the relief pressure is reached, the pressure moves the
spindle (5) downward while the pressure compresses the
spring (6). The relief oil flows from the high pressure side to
the low pressure side of the main loop, The oil flows through
the gap between the spindle (5) and the collar (7). The arrows
show this flow in illustration 22. High pressure oil enters the
low pressure side of the main loop circuit until the force of the
spring (6) seats the spindle (5) and the collar (7).
Main Relief Function
Illustration 23
Relief Valve Cross Section
(2) Locking cap. (3) Conical spring. (4) Collar. (5) Spindle.
(6) Spring. (7) Collar.
Oil from the vibratory pump flows through the relief valve (1) at
the passages (A). The force of the spring (3) and the oil
pressure in passage (A) keep the collar (7) closed. Charge
pressure acts on the bottom of collar (7) and the spindle (5).
When the oil pressure in passage (A) drops below the charge
pressure, collar (7) and the spindle (5) move upward
compressing the spring (3).
The charge oil flows through the gap. The closed loop circuit
will be replenished with the makeup oil. The arrows show this
flow in illustration 23, Charge oil continues to replenish the low
pressure side of the circuit with the make up oil until the
pressure in passage (A) becomes greater than the charge
pressure.
11-27
