This series of rotary damper valves can be widely applied to the rotary mechanism of hydraulic engineering machinery (open-type system). It is a kind of high-performance multi-function combination valve. Its quality has been strictly tested by China National Construction Machinery Quality Supervision Testing Center according to JB/T4030.1-1985 and met the reliable requirement GZJRZ No. 020. It can replace an inlet valve.

Basic parameters:
1. Rated flow QH=40～120L/min;
2. Rated working pressure PH=25MPa;
3. Rated pressure of adjustable back pressure valve Pb=0.7～4.7MPa;
4. Rated working voltage of solenoid valve: DC 24V;
5. Hydraulic control pressure: Px=0.6～2.2MPa (or mechanical operation mode).