1 PILOT OPERTED PRESSURE REDUCER VLVE - Series VR4R Veljan Pressure Reducer Valve Series VR4R are pilot operated controls used to control pressure in a secondary part of a hydraulic circuit. Pressure is maintained as set by control knob on the pilot or by an external pilot source. In some application,vr4r is used to maintain a lower pressure in the secondary circuit to limit the force available from certain 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 setting is achieved by means of a knurled knob. For tamper proof setting, acorn nut with lead seal is available as an option. Optional vent valve VVVO1 sandwiched between pilot section and main body can be used for venting the VR4R valves. Extremely accurate settings can be obtained due to the precise construction of control components. The design of poppet allows for the minimum of friction and hysteresis giving 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 main poppet opens downwards against a spring 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 main poppet through an orifice. No flow takes place in this section until the pressure demand exceeds the setting of the X pilot head,as determined/set by the control knob. The pilot cone lifts from its seat against the setting spring and allows a maintained pilot flow to pass to external drain. The effect of this is to limit the pressure available on top of the main poppet. In this condition the main poppet moves up and floats allowing enough flow to the secondary circuit ( port ) to maintain the set pressure. If the secondary circuit exceeds the pilot head setting, the main poppet moves up further and closes preventing flow to a secondary circuit. Possibilities of any pressure intensification in the secondary part is eliminated by the small check valve when it opens and allows flow to pilot drain.
2 PILOT OPERTED PRESSURE REDUCER VLVE - Series VR4R SPECIFICTIONS General Type : Pilot operated Pressure reducer Valve Design : Poppet type Mounting : Threaded/Subplate/Cartridge Mounting position : Optional Port sizes (nominal) : 3/8, 3/4, 1 1/4 Direction of flow : mbient temperature : --2 C...+6 C (--4 F F) Special working conditions : Consult VELJN Hydraulics Pressure control range : Minimum - depends on flow Maximum - 5 psi (35 bar) Maximum operating pressure : Port ( primary ) 5 psi (35 bar) Port ( secondary ) 5 psi (35 bar) Port X (pilot) Port, 1 (Pilot drain ) 5 psi (35 bar) Without pressure to tank : VR4R 3 ( 3/ ) VR4R 6 ( 3 8 / 4 ) VR4R 1 ( 1 1/ 4 ) Nominal flow gpm ( lpm) : 15.8 (6) 52.9 (2) 119. (45) Maximum flow gpm ( lpm) : 23.8 (9) 79.4 (3) (6) Fluid : Mineral 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 operating viscosity : 3 cst (18 SSU) Seal compatibility : Code 1 (una N) or Code 5 (Viton) (contact Veljan with specific oil details) Cleanliness recommended : etter than NS 1638 Class 8 or ISO 17/14 djustment Manual : Handwheel Rotation : 3.75 rev. Operating torque :.72 Nm Electricals ( Vent Valve VVV1) : Solenoid Nominal voltage : Refer to Ordering Code Permissible voltage fluctuation : +5%...--1% Max. coil temperature : +155 C (311 F) Type of current : lternating Current (C)/Direct Current (DC) Input power : 31 W Holding : 78 V Inrush : 264 V Relative operating 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 Mounting 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 mounting 3 - Subplate mounting X 1+ 1 port = 1/ 4 NPTF 7 - Subplate mounting X+ ports=se-4( 7 / UNF) 9 - Subplate mounting X 1+ 1 Ports = G1/ 4 Pressure setting range psi (7-15 bar) psi (7-21 bar) psi (7-35 bar) Solenoid Voltage (Omit for non vent version) Drain line 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 line blocked) 1 - Without manual override (Solenoid de-energized : open to tank. Solenoid energized : vent line blocked) 11 - With manual override (Solenoid de-energized : vent line blocked Solenoid energized : open to tank) 12 - Without manual override (Solenoid de-energized : vent line blocked Solenoid energized : open to tank) drain to manifold (only for cartridge) - External from subplate or manifold () - External from pilot head ( 1) Type of Control t subplate mounting only with body code 3,7,9 1-Hand knob (32mm dia) 2-Hand knob (5mm 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 min - qv characteristics VR4R3 Minimum Differential Pressure between Inlet & Outlet Pressure at Various Flow Rates Variation in Outlet Pressure for variation in Flow Rate The effect of increase of Inlet Pressure on Outlet Pressure setting Differential pressure in 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 in 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 in 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 in bar (psi) VR4R6 & VR4R1 Differential pressure in bar (psi) 25 (362.5) 2 (29) 15 (217.5) 1 (145) 5 (72.5) Minimum Differential Pressure between Inlet & Outlet Pressure at Various flow Rates (26.5) (53.) (79.5) Outlet pressure in bar (psi) 35 (575) 3 (435) 25 (3625) 2 (29) 15 (2175) 1 (145) 5 (725) Variation in Outlet Pressure for variation in 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 in bar (psi) 3 (435) 25 (3625) 2 (29) 15 (2175) 1 (145) 5 (725) The effect of increase of Inlet Pressure on Outlet Pressure setting Q=18 lpm (47.36 gpm) (725) (145) (2175) (29) (3625) (435) (575) Flow qv lpm(gpm) Flow qv lpm(gpm) Inlet Pressure in bar (psi) Note : ll Performance Data given is typical and can be influenced by application. Oil Temperature = 45 C (113 F) ; Oil Viscosity = 4cSt (24SSU).
5 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 ø max 15.3 ø6 max r Max C7 r Max øc9 max C8 ø ø ø 3/8-24 UNF x.79 dp. (M1 x 2 dp.) 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 / ø / / / /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 drain or 4 Mounting screws* 3/8-24 UNF x 1 3 /4 lg. M1 x 45mm, DIN Order - No. V or V * Mounting screws must be ordered separately
6 PILOT OPERTED PRESSURE REDUCER VLVE - Series VR4R VR4R1 (1 1/4 ) SUPLTE MOUNTING OD ( #3, #7 & #9 ) max Panel opening Weight : lbs (6. kg) 1 ø ø ø1 1 lock mounting face Flatness.1 mm/1 mm length Surface finish CL 1.27 µm ø7 D7 D8 ø2 ø1 ø /8"-16 UNC x.71 dp.. (M1 x 18 dp.) D9 Location hole ø.41 ø ø.65 ø ø1.26 ø32. Ports,( 1) Function Primary (inlet) Secondary (Outlet) Remote control or vent connection External drain ø ø D7 D8 D ø.28 ø1.26 ø7.1 ø32. ø.28 x ø7.1 x.315 dp. 8. dp. Note : For details of Subplate & mtg.screws please refer page 74
7 PILOT OPERTED PRESSURE REDUCER VLVE - Series VR4R Subplate for VR4R1 Weight : 19.1 lbs ( 8.5 kg) /8-16 UNC x.71 dp. (M1 x 18 dp.) 12 1 ø ø ø19 ø18 ø4 8 ø1 2 r Location hole 2 Note: Not used,must be plugged before installation (1/4 NPTF or G1/4 ) ø.28 ø.28 x.315 dp. ø.28.4 r ø7.1 ø7.1 x 8. dp. ø r ø.351 ø ø.59 ø Order No. + Port sizes Dimension 4 Mounting screws* Order No. min.tensile strength VSS - P G 114 VSS G 115 VSS G NPTF 3/4.S.P.P. 1.S.P.P 1/4 NPTF 1/4.S.P.P. 3/8-16UNC 1 3 /4 lg M1 x 45mm DIN V V at p< 21 bar = 1 dan/mm - (Torque 68 Nm) 2 at p>21 bar = 12 dan/mm (Torque 82 Nm) * Mounting screws are included in subplate order. For valves ordered without subplate, mounting screws must be ordered seperately.
8 PILOT PILOT OPERTED PRESSURE REDUCER VLVE VLVE - Series - Series VR4R VR4R OPTIONL CONTROL Type of control - Code 3 cron nut with lead seal Type of control - Code 2 Hand knob 5mm dia (not for version with vent valve VVV1) Weight (VVV1) : 3.73 lbs (1.7 kg) Screws for additional vent valve installation. 4 x M1 X 9 long Pilot valve Vent valve VVV1 Manual override Main valve Plug-in connector DIN 4365 (supplied as standard) PG 9/11 ø 1 Max in mm in mm ø ø5. Version with Vent Valve VVV1 1 Code External Drain X 2 2 X Z 11 or 12 X X X or 1 X X D7 D8 D9 C 149 DC 16 Solenoid coil can be positioned -at 9 intervals (C) -In any position (DC) D7 D8 D9 1 in ø mm ø