VR5V12
8Pages

Catalog excerpts

PILOT OPERATED PRESSURE CONTROLS - FLANGED TYPE VR5 Series Veljan Flanged type, Valves Series VR5V( Relief ), VR5U (Unloader] and VR5S (Sequence ) are pilot controls. These range of valves are suitable for mounting directly on a SAE Pump outlet flange, ensuring maximum pump protection against peak pressure and eliminating costly piping. The pilot stage of VR5 valves are designed to reduce pressure overshoot and minimise cracking flow, thus reducing power and production losses during high pressure operation . VR5 valves consist 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 a knurled knob. For tamper proof setting, acorn nut with lead seal is available as option. Optional Vent Valve VWO sandwiched between pilot section and main body can be used for venting the VR5 valves. Exceptionally fast response is obtained due to precise ratio between main piston area and its mass. High accuracy and quiet, flutter free control are the important Pressure Relief valve VR5V Internal Drain External Drain VR5V Pressure relief valves are used to limit the pressure of a hydraulic system. The VR5V may also be used to generate a pressure drop in a hydraulic circuit. Normally port A is connected to pump and port B to tank.

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PILOT OPERATED PRESSURE CONTROLS - FLANGED TYPE VR5 Series Pressure unloading valve VR5U Internal Drain External Drain Accumulator system with unloading valve VR5U VR5U pressure unloading valves are used to unload a circuit at low pressure when a port signal ( X ) is maintained at a pressure that is higher than that of the pliot section. A typica application for VR5U is to unload a pump that is connected to an accumulator circuit. Another use for the VR5U is to unload the low pressure side of a double pump. Pressure sequence valve VR5S VR5S valve enables a hydraulic system to operate in a...

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PILOT OPERATED PRESSURE CONTROLS - FLANGED TYPE VR5 Series Mounting position Port sizes (nominal] Ambient temperature Special working conditions Pressure control range Maximum operating pressure PortX (pilot) Port Y, Yi (Pilot drain Fluid Temperature Range Viscosity Range Optimum operating viscosity Seal compatibility Cleanliness recommended Operating torque Electricals ( Vent Valve VW01 ] Nominal voltage Permissible voltage fluctuation Relative operating period Pilot operated Relief/Unloading/Sequence Valve Poppet type Consult VELJAN Minimum - depends on flow depends on pump delivery...

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PILOT OPERATED PRESSURE CONTROLS - FLANGED TYPE VR5 Series ORDERING CODE VR5V - Pressure Relief Valve VR5U - Pressure Unloading Valve VR5S - Pressure Sequence Valve Max. Pressure of Valve Body- '' Port Yl is only available at external drain from the pilot heao Pressure setting range - 2 - Hand knob (50mm dia) (not for version with vent valve WVOl ) 3 - Acorn nut with lead sea Seal Class Design letter - Solenoid Voltage (Omit for non vent version) Electrical Vent Omit for non vent version 09 - With manual override (Solenoid de-energized : open to tank. Solenoid Energized : vent line blocked)...

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PILOT OPERATED PRESSURE CONTROLS - FLANGED TYPE VR5 Series Min. possible pressure setting > 3 bar. (43.5 psi) Pressure Differential Charecteristics for VR5U Unloader Valve The differential between Unloading and Onloading Is typical 15%. When system pressure (for Instance accumulator) drops 15% below the pilot setting, the valve closes and pump feeds the system again. 1) Unloading" (pressure settilng) Pump pressure bar(psi)

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PILOT OPERATED PRESSURE CONTROLS - FLANGED TYPE VR5 Series external pilot pressure with VC5V check valve -Mounted directly on the "E" cartridge of VELJAN vane pumps. 1 ) Closed when supplied

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PILOT OPERATED PRESSURE CONTROLS - FLANGED TYPE VR5 Series OPTIONAL CONTROL Type of control - Code 3 Acron nut with lead seal Type of control - Code 2 [not for version with vent valve VVV01 ) Version with Vent Valve VWO I Screws for additional vent valve installation. Vent valve Pressure Relief Valve Pressure Unloading Valve Sequence Valve r~~i r~~i

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PILOT OPERATED PRESSURE CONTROLS - FLANGED TYPE VR5 Series Inlet flange (only for pipe mounting) Outlet and tank port flange B.S.P.P Flange Socket weld N.P.T.F flange B.S.P.P flange Socket weld

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