South China Heavy Industry (Jiangxi) Co., Ltd.

The pilot-assisted opening balance valve is used to control overslack loads. It allows free unidirectional flow of fluid from the directional valve (port 2) to the load port (port 1), while the direct-acting, pilot-assisted relief valve function controls the flow from port 1 to port 2. The pilot assistance at port 3 reduces the effective setpoint of the relief function by adjusting the pilot ratio. This valve is also known as a motion control valve or an over-center valve.