VR4U 03 / 06 / 10 Series
Veljan Unloading Valves series VR4U are pilot operated controls and used to unload a circuit at low pressure when pilot pressure at port X is maintained higher than that of inlet pressure at port A set by the pilot spring.
Product Description
A typical use of an unloader valve is to unload the low pressure side of a double pump. A Pump connected to an Accumulator circuit can also be unloaded by the VR4U valve.
VR4U consists of a high flow poppet type seat valve section controlled by the low flow, adjustable pilot section mounted on top. Pressure setting is achieved by means of knurled knob. For tamper proof setting, acorn nut with lead seal is available as option. Optional vent valve VVV01 sandwiched between pilot section and main body can be used for venting the VR4U valves.
Exceptionally fast response is obtained due to the precise ratio between the main piston area and its mass. One of the unique features of VR4U is that it works as a relief valve at the set pressure even in the absence of external pilot signal.
