Working Process：

When the engine stops：

Pr→T close；P1→Pr open.

Neutral Position：

If pressure Pr is higher than dominated pressure, pilot pressure relief valve (poppet valve) opens and hydraulic oil is back to oil tank; after open the open level between P1 and Pr can be adjusted to keep certain Pr pressure.

When abnormal high pressure is generated：

If Pr pressure is abnormally high, the safety valve opens and hydraulic oil flows from Pr to T. Pressure Pr then drops down to avoid working devices (PPC valve, solenoid valve and other devices that use pressure oil from empty Pr pressure ) generates abnormal high pressure.

Compatible vehicles：PC60-7、 PC200-6 、PC120-6

Ordering Code