Catalogs >
Veljan Hydrair Limited >
VR5U08 Series

VR5U08 Series
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 For tamper proof setting, acorn nut with lead seal is suitable for mounting directly on a SAE Pump outlet flange, ensuring available as option. Optional Vent Valve VVV01 maximum pump protection against peak pressure and eliminating sandwiched between pilot section and main body can be costly piping. The pilot stage of VR5 valves are designed to reduce Pressure setting is achieved by means of a knurled knob. used for venting the VR5 valves. pressure overshoot and minimise cracking flow, thus reducing power and production losses during high pressure operation . Exceptionally fast response is obtained due to precise ratio between main piston area and its mass. High VR5 valves consist of a high flow poppet type seat valve section accuracy and quiet, flutter free control are the important controlled by the low flow, adjustable pilot section mounted on top. 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.

Open the catalog to page 1

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 typical 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 B VR5S valve enables a hydraulic system to operate in...

Open the catalog to page 2

PILOT OPERATED PRESSURE CONTROLS - FLANGED TYPE VR5 Series 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) Pilot operated Relief/Unloading/Sequence Valve Poppet type Flanged According to SAE - 3000 psi (210 bar) e.g. Directly on a pump VR5V12 also 6000 psi (420 bar) Optional 3/4”, 1”, 1 1/4” 1 1/2” ( only for VR5V and VR5U) A B -20° C...+ 60° C (-4° F...+140° F) Consult VELJAN Minimum - depends on flow...

Open the catalog to page 3

PILOT OPERATED PRESSURE CONTROLS - FLANGED TYPE VR5 Series ORDERING CODE VR5* 06 Series VR5V - Pressure Relief Valve Seal Class VR5U - Pressure Unloading Valve 1 - Buna N ( Standard) 5 - Viton Design letter Solenoid Voltage (Omit for non vent version) Port Y1 is only available at external drain from the pilot head Electrical Vent (3way VENT VALVE VVV01) Omit for non vent version 09 - With manual override (Solenoid de-energized : open to tank. Solenoid Energized : vent line blocked) 10 - Without manual override (Solenoid de-energized : open to tank. Solenoid energized : vent line blocked) 11...

Open the catalog to page 4

PILOT OPERATED PRESSURE CONTROLS - FLANGED TYPE VR5 Series Min. possible pressure setting 3 bar. (43.5 psi) Fluid 40 cSt at 50°C ± 0.5°C. (240 SSU at 120°F ± 32.9°F) 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. Pressure Differential Charecteristics for VR5U Unloader Valve Pressure differential bar(psi) 1) " Unloading" (pressure settiing) Pump pressure bar(psi)

Open the catalog to page 5

PILOT OPERATED PRESSURE CONTROLS - FLANGED TYPE VR5 Series VR5V08-VR5U08-VR5S08 ( 1” ) X (3.0 dia. only on VR5U) external pilot pressure port available for use with VC5V check valve Port sizes Pressure gauge 1) Closed when supplied 2) Secondary port on VR5S Note : VR5*08 pressure controls mounted directly on 1” - SAE 61 Ports of VELJAN Vane Pumps ( “C” Cartridge)

Open the catalog to page 6

PILOT OPERATED PRESSURE CONTROLS - FLANGED TYPE VR5 Series OPTIONAL CONTROL Type of control - Code 3 Type of control - Code 2 Acron nut with lead seal Hand knob 50mm dia (not for version with vent valve VVV01) Dimensions B1 Version with Vent Valve VVV01 Screws for additional vent valve installation. 4 x M10 X 90 long Plug-in connector DIN 43650 (supplied as standard) Pilot valve Manual override Y2 Main valve Solenoid can be positioned - at 90° intervals (AC) - In any position (DC) Pressure Relief Valve VR5V Pressure Unloading Valve VR5U Internal Drain External Drain

Open the catalog to page 7

PILOT OPERATED PRESSURE CONTROLS - FLANGED TYPE VR5 Series SAE - Flanges Inlet flange (only for pipe mounting) l1 Socket weld B.S.P.P Flange Outlet and tank port flange l1 flange (with screws) Socket weld B.S.P.P flange Tank port N.P.T.F flange Inlet flange Outlet flange (without screws) (without screws) only for pipe mounting

Open the catalog to page 8