SBG Low-Noise Pilot Operated Relief Valves 

Low Noise Type Pilot Operated Pressure Relief Valves Pilot operated relief valves here have been particularly developed as low-noise types. Able to protect pumps and control valves against excessive pressures, they are used to control the pressure in the hydraulic system to a constant level. Remote control and unloading are permitted by using vent circuits.Haohong Hydraulic also has types of Pressure Reducing Valves and Directional Control Valves.