VR4V
8Pages

Catalog excerpts

PILOT OPERATED PRESSURE RELIEF VALVE - Series VR4V The Veljan Pressure Relief Valve series VR4V are pilot operated and work Internal Drain on the principle of hydraulic balancing. These valves are used to limit the system pressure in a hydraulic system and protect the system against pressure overload. Accurate pressure control even under wide flow variations are achieved by these valves. The valves may also be used to generate a pressure drop in a hydraulic circuit. VR4V consist of a high flow poppet type seat valve section controlled by External Drain the low flow, adjustable pilot section mounted on top. Pressure setting is A achieved by means of knurled knob. For tamper proof setting, an acorn nut with lead seal is available as option. Optional vent valve VVV01 B sandwiched between pilot section and the main body can be used for venting the VR4V valves. Exceptionally fast response is obtained due to the precise ratio between the main piston area and its mass. High pressure stability is an outstanding feature of VR4V valves. VR4V03 pilot valve Normally port A is connected to pump and port B to tank . VR4V06/10 pilot valve At low pressure, flow entering port A is blocked by the main poppet. Pressure at port A passes to the pilot section as well as to the top of the main poppet through orifices. No flow takes place in this portion until the pressure overcomes the spring setting of the pilot cone. This pilot cone is lifted from its seat releasing a small pilot flow to tank and resulting in a pressure drop across the main poppet. The main poppet opens and allows only enough flow from port A to port B maintaining inlet pressure at the set value of the pilot spring. At drop of inlet pressure below the set value, the main poppet closes instantly. Pilot drain is normally through port B for internal drain valves. External drain from port Y or Y1 is optional. Port X may be used for venting or remote control of VR4V valves.

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PILOT OPERATED PRESSURE RELIEF VALVE - Series VR4V SPECIFICATIONS General Type Design Mounting Mounting position Port sizes (nominal) Direction of flow Ambient temperature Special working conditions Hydraulics Pressure control range Maximum operating pressure Port A (inlet) Port B (outlet) Port X (pilot) Port Y, Y1 (Pilot drain ) Pilot operated pressure relief Poppet type Threaded/Subplate/Cartridge/Flange Optional 3/8”, 3/4”, 1 1/4” A B --20° C...+60° C (--4° F...+140° F) Consult VELJAN Nominal flow gpm (lpm) Maximum flow gpm (lpm) Fluid Fluid Temperature Range Mineral oil as per DIN...

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PILOT OPERATED PRESSURE RELIEF VALVE - Series VR4V ORDERING CODE VR4V 06 *** Modification Seal Class 1 - Buna N ( Standard) 5 - Viton Design letter Solenoid Voltage (Omit for non vent version) Max.Pressure of Valve Body 0 - for cartridges only 5 - 5000psi (350 bar) Body Mounting Cartridge / 0 - Cartridge Y1 port = 14” NPTF E - Cartridge Y1 port = SAE - 4 (7/16” - 20 UNF) / G - Cartridge Y1 port = G14” Threaded body / 1 - Threaded body - VR4V03 = 12”NPTF ; VR4V06 = 1” NPTF (2 A - Ports, 1B - Port) / A - Threaded body VR4V06 = 34” NPTF ; / VR4V10 = 114” NPTF (1 A - Port, 1B - Port) / 6 -...

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PILOT OPERATED PRESSURE RELIEF VALVE - Series VR4V PERFORMANCE CURVES p - qv - Characteristics (Fluid 60 cSt at 40° C Test temp. 50° C+ 10%) Pressure drop ( P) bar(psi) Pressure drop ( P) bar(psi) Pressure drop ( P) bar(psi)

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PILOT OPERATED PRESSURE RELIEF VALVE - Series VR4V VR4V03 (3/8”) SUBPLATE MOUNTING BODY ( #3, #7 & #9 ) Weight : 5.93 lbs (2.7 kg ) A1 max. Block mounting face Flatness 0.01 mm/100 mm length Surface finish CLA 1.27 µm Location hole Pressure (inlet) Tank (outlet) Remote control or vent connection External drain1) 1) Optional from pilot head or subplate. Port Y1 is only available at drain line (code 2) external from the pilot head. Note : For details of Subplate & mtg. screws please refer page 12

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PILOT OPERATED PRESSURE RELIEF VALVE - Series VR4V VR4V03 (3/8”) SUBPLATE Location hole Port sizes Order No. Mounting screws are included in subplate order. For valves ordered without subplate, mounting screws must be ordered separately. min.tensile strength

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PILOT OPERATED PRESSURE RELIEF VALVE - Series VR4V VR4V03 (3/8”) - THREADED BODY ( #1, #4 & #6 ) Port Sizes Pressure (inlet) Tank (outlet) Ext.remote control External drain 1) Closed when supplied 2) Port Y1 is only available at drain line (code 2) external from the pilot head

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PILOT OPERATED PRESSURE RELIEF VALVE - Series VR4V CARTRIDGE WITH PILOT VALVE VR4V03 ( #0, #E & #G ) Orifice position (Orifice is content of delivery) Pressure (Inlet) Tank (Outlet) External control connection 1) Port Y1 is only available at drain line (code 2) external from the pilot head. 4 Mounting screws* Dimensions * Mounting screws must be ordered separately

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