PILOT OPERATED PRESSURE REDUCER VALVE - Series VR4R

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1 PILOT OPERTED PRESSURE REDUCER VLVE - Series VR4R Veljan Pressure Reducer Valve Series VR4R are pilot operated controls used to control pressure a secondary part of a hydraulic circuit. Pressure is mataed as set by control knob on the pilot or by an external pilot source. In some application,vr4r is used to mata a lower pressure the secondary circuit to limit the force available from certa actuators. X VR4R consists of a high flow poppet type seat valve section controlled by the low flow, adjustable pilot section mounted on top. Pressure settg is achieved by means of a knurled knob. For tamper proof settg, acorn nut with lead seal is available as an option. Optional vent valve VVVO1 sandwiched between pilot section and ma body can be used for ventg the VR4R valves. Extremely accurate settgs can be obtaed due to the precise construction of control components. The design of poppet allows for the mimum of friction and hysteresis givg a sensitive response to conditional changes. 1 OPTIONL Normally, port is connected to the secondary part of the hydraulic circuit and port to the primary part. When the secondary port is unpressurised, the ma poppet opens downwards agast a sprg by the pressure at primary Port. Flow passes from primary port to secondary port. Pressure at port passes to the pilot section and to the top of ma poppet through an orifice. No flow takes place this section until the pressure demand exceeds the settg of the X pilot head,as determed/set by the control knob. The pilot cone lifts from its seat agast the settg sprg and allows a mataed pilot flow to pass to external dra. The effect of this is to limit the pressure available on top of the ma poppet. In this condition the ma poppet moves up and floats allowg enough flow to the secondary circuit ( port ) to mata the set pressure. If the secondary circuit exceeds the pilot head settg, the ma poppet moves up further and closes preventg flow to a secondary circuit. Possibilities of any pressure tensification the secondary part is elimated by the small check valve when it opens and allows flow to pilot dra.

2 PILOT OPERTED PRESSURE REDUCER VLVE - Series VR4R SPECIFICTIONS General Type : Pilot operated Pressure reducer Valve Design : Poppet type Mountg : Threaded/Subplate/Cartridge Mountg position : Optional Port sizes (nomal) : 3/8, 3/4, 1 1/4 Direction of flow : mbient temperature : --2 C...+6 C (--4 F F) Special workg conditions : Consult VELJN Hydraulics Pressure control range : Mimum - depends on flow Maximum - 5 psi (35 bar) Maximum operatg pressure : Port ( primary ) 5 psi (35 bar) Port ( secondary ) 5 psi (35 bar) Port X (pilot) Port, 1 (Pilot dra ) 5 psi (35 bar) Without pressure to tank : VR4R 3 ( 3/ ) VR4R 6 ( 3 8 / 4 ) VR4R 1 ( 1 1/ 4 ) Nomal flow gpm ( lpm) : 15.8 (6) 52.9 (2) 119. (45) Maximum flow gpm ( lpm) : 23.8 (9) 79.4 (3) (6) Fluid : Meral oil as per DIN 51524/25 or other fluids on request Fluid Temperature Range : -18 C C ( F F) Viscosity Range : 1 to 65 cst (6 to 39 SSU) Optimum operatg viscosity : 3 cst (18 SSU) Seal compatibility : Code 1 (una N) or Code 5 (Viton) (contact Veljan with specific oil details) Cleanless recoended : etter than NS 1638 Class 8 or ISO 17/14 djustment Manual : Handwheel Rotation : 3.75 rev. Operatg torque :.72 Nm Electricals ( Vent Valve VVV1) : Solenoid Nomal voltage : Refer to Orderg Code Permissible voltage fluctuation : +5%...--1% Max. coil temperature : +155 C (311 F) Type of current : lternatg Current (C)/Direct Current (DC) Input power : 31 W Holdg : 78 V Inrush : 264 V Relative operatg period : 1% Type of protection : I P 65

3 PILOT OPERTED PRESSURE REDUCER VLVE - Series VR4R ORDERING CODE VR4R W7-1 *** Series Size / 8 6-3/ / 4 Max. Pressure of Valve ody - for cartridges only 5-5psi (35 bar) ody Mountg Cartridge - Cartridge X 1 + 1port = 1/ 4 NPTF E - Cartridge X port = SE - 4 ( 7/16-2 UNF) G- Cartridge X port = G 1/ 4 Threaded body Threaded body - VR4R3 = 2/ NPTF ;,1ports (2- Ports,1-Port) = 1 - Threaded body VR4R6 = 3/ / 4 4 NPTF NPTF (1-Port,1-Port) Threaded body VR4R3 = 2/.S.P.P ; (2-Ports,1-Port),1ports D - Threaded body VR4R6 = 3/.S.P.P ; =G 1/ 4 4 (1-Port,1-Port) 4 - Threaded body VR4R3 - SE - 8 X 1,1ports (2- Ports,1-Port) =SE-4 - Threaded body VR4R6 - SE - 12, (7/16 - (1-Port,1-Port) 2 UNF) Subplate mountg 3 - Subplate mountg X 1+ 1 port = 1/ 4 NPTF 7 - Subplate mountg X+ ports=se-4( 7 / UNF) 9 - Subplate mountg X 1+ 1 Ports = G1/ 4 Pressure settg range psi (7-15 bar) psi (7-21 bar) psi (7-35 bar) Solenoid Voltage (Omit for non vent version) Dra le Modification Seal Class una N ( Standard) - Viton Design letter W1-115V/6 Hz C GOR - 12V DC W2-23V/6 Hz C GOQ - 24V DC W6-115V/5 Hz C GOH - 48V DC W7-23V/5 Hz C Electrical Vent (3way VENT VLVE VVV1) Omit for non vent version 9 - With manual override (Solenoid de-energized : open to tank. Solenoid energized : vent le blocked) 1 - Without manual override (Solenoid de-energized : open to tank. Solenoid energized : vent le blocked) 11 - With manual override (Solenoid de-energized : vent le blocked Solenoid energized : open to tank) 12 - Without manual override (Solenoid de-energized : vent le blocked Solenoid energized : open to tank) dra to manifold (only for cartridge) - External from subplate or manifold () - External from pilot head ( 1) Type of Control t subplate mountg only with body code 3,7,9 1-Hand knob (32 dia) 2-Hand knob (5 dia) (not for version with vent valve VVV1) 3-corn nut with lead seal

4 PILOT OPERTED PRESSURE REDUCER VLVE - Series VR4R PERFORMNCE CURVES ps m - qv characteristics VR4R3 Mimum Differential Pressure between Inlet & Outlet Pressure at Various Flow Rates Variation Outlet Pressure for variation Flow Rate The effect of crease of Inlet Pressure on Outlet Pressure settg Differential pressure bar (psi) 25 (362.5) 2 (29.) 15 (217.5) 1 (145) 5 (72.5) (5.3) (1.6) (15.9) (21.2) (26.5) Outlet pressure bar (psi) 35 (575) 3 (435) 25 (3625) 2 (29) 15 (2175) 1 (145) 5 (725) Inlet 35 bar (5 psi) Inlet 28bar (4 psi) Inlet 21 bar (3 psi) Inlet 15 bar (15 psi) (5.3) (1.6) (15.9) (21.2) (26.5) Outlet pressure bar (psi) 25 (3625) 2 (29) 15 (2175) 1 (145) 5 (725) qv=22 lpm (5.8 gpm) (725) (2175) (3625) (575) (145) (29) (435) Flow qv lpm(gpm) Flow qv lpm(gpm) Inlet Pressure bar (psi) VR4R6 & VR4R1 Differential pressure bar (psi) 25 (362.5) 2 (29) 15 (217.5) 1 (145) 5 (72.5) Mimum Differential Pressure between Inlet & Outlet Pressure at Various flow Rates (26.5) (53.) (79.5) Outlet pressure bar (psi) 35 (575) 3 (435) 25 (3625) 2 (29) 15 (2175) 1 (145) 5 (725) Variation Outlet Pressure for variation Flow Rate Inlet 35 bar (5 psi) Inlet 28bar (4 psi) Inlet 21bar (3 psi) Inlet 14 bar (2 psi) Inlet 7 bar (1 psi) (26.5) (53.) (77.5) Outlet pressure bar (psi) 3 (435) 25 (3625) 2 (29) 15 (2175) 1 (145) 5 (725) The effect of crease of Inlet Pressure on Outlet Pressure settg Q=18 lpm (47.36 gpm) (725) (145) (2175) (29) (3625) (435) (575) Flow qv lpm(gpm) Flow qv lpm(gpm) Inlet Pressure bar (psi) Note : ll Performance Data given is typical and can be fluenced by application. Oil Temperature = 45 C (113 F) ; Oil Viscosity = 4cSt (24SSU).

5 PILOT OPERTED PRESSURE REDUCER VLVE - Series VR4R VR4R6 (3/4 ) SUPLTE MOUNTING OD ( #3, #7 & #9 ) Weight : 9.89 lbs (4.5 kg) max 9 Panel openg Ø ø ø ø7 lock mountg face Flatness.1 /1 length Surface fish CL 1.27 µm D4 D3 D2 D1 3/8-16 UNC x.71 dp. (M1 x 18 dp.) D6 D7 D5 ød1 D ø6 ød D8 Location hole ø.41 ø ø.65 ø ø1.26 ø32. Ports Function ø4.645 ø118. ø.433 ø11. D1 D2 D3 D4 D5 D6 D7 D8 D9 D1 D ø.92 ø.28 x.315 dp ø23.4 ø7.1 x 8. dp., 1 Primary (let) Secondary (outlet) Remote control or vent connection External dra Note : For details of Subplate & mtg. screws please refer page 7

6 PILOT OPERTED PRESSURE REDUCER VLVE - Series VR4R SUPLTE FOR VR4R6 (3/4 ) Weight : 1.54 lbs ( 4.8 kg) C5 C6 7 9 ø ø17 8 ø18 ø2 ø4 Location hole /8-16 UNC x.79 dp (M1 x 18 dp). 3 Note: Not used,must be plugged before stallation (1/4 NPTF or G1/4 ) ø ø ø ø16.5 C5 C ø.92 ø.28 x.315 dp. ø ø23.4 ø7.1 x 8. dp. ø7.1 Order No. + Port sizes Dimension 4 Mountg screws* Order No. m.tensile strength VSS - P G NPTF 1/4 NPTF 3/8-16UNC 13 /4 lg VSS G 115 VSS G 115 3/4.S.P.P. 1.S.P.P 1/4.S.P.P. M1 x 45 DIN * Mountg screws are cluded subplate order. For valves ordered without subplate mountg screws must be ordered seperately. V V at p< 21 bar = 1 dan/ - (Torque 68 Nm) 2 at p>21 bar = 12 dan/ (Torque 82 Nm)

7 PILOT OPERTED PRESSURE REDUCER VLVE - Series VR4R VR4R6 (3/4 ) - THREDED OD ( #, # & #D ) Weight : 7.4 lbs ( 3.3 kg) 1 max Ports 1 Function Primary (let) Secondary (outlet) Remote control or vent connection External dra Ports sizes 3/4 NPTF or G 3/4 or SE - 12 (1 1 /16-12 UNF) 3/4 NPTF or G 3/4 or SE - 12 (11 /16-12 UNF) 1/4 NPTF or G 1/4 or SE - 4 ( 7/16-2 UNF) 1/4 NPTF or G 1/4 or SE - 4 (7/16-2 UNF)

8 PILOT OPERTED PRESSURE REDUCER VLVE - Series VR4R CRTRIDGES WITH PILOT VLVES VR4R6/VR4R1 ( #, #E & #G ) (1/4 NPTF or G1/4" or SE-4) Weight : 2.64 lbs (1.2 kg) 45 ø ø X øc5 max 15.3 ø6 max C6 r Max C7 r Max øc9 max C8 ø D1 ød6 D2 ød3 3/8-24 UNF x.79 dp. (M1 x 2 dp.) D4 D5 C5 C6 C7 C8 C ø1.73/1.77 ø1.5 ø / r.16 r 1.2 ø1.1 ø / ø1.26 ø44./45. ø38.1 ø / r.4 r 26. ø28. ø / ø32. D1 D2 D3 D4 D5 D / / / /31.95 ø.126 ø ø.126 ø ø3.2 ø6. Ports X, 1 Function Primary (Inlet) Secondary (Outlet) Internal pilot pressure Remote control or vent connection External dra or 4 Mountg screws* 3/8-24 UNF x 1 3 /4 lg. M1 x 45, DIN Order - No. V or V * Mountg screws must be ordered separately