PILOT OPERATED SEQUENCE VALVE - Series VR4S

Transcription

1 PILOT OPERTED SEQUENCE VLVE - Series VRS Veljan Sequence Valve Series VRS are pilot operated controls and enable a hydraulic system to operate a sequence. Fluid is allowed to pass to a secondary system ( Port ) after the primary system ( Port ) pressure reaches the preadjusted value set at pilot sprg. VRS consists of a high flow poppet type seat valve section controlled by the low flow, adjustable pilot section mounted on top. Pressure settg is altered by means of a knurled knob. For tamper proof settg, acorn nut with lead seal is available as option. Optional vent valve VVV sandwiched between the pilot section and the ma body can be used for ventg the VRS valves. Pilot dra can be taken out externally from a pilot head or from a subplate. Exceptionally fast response is obtaed due to the precise ratio between the ma piston area and its mass. The unique design features of pilot allows for accurate and stable secondary pressure controls. Precise adjustment and quick response elimate pressure variation and system shocks. Port is connected to the primary section and port to the secondary section of a hydraulic system. t low pressure, flow enterg to Port is blocked by the ma poppet. Pressure at Port passes through orifices to the pilot section as well as to the top of the ma poppet. No flow takes place to this section until the pressure overcomes the sprg settg of the pilot cone. The pilot cone is lifted from its seat releasg a small pilot flow through external dra and resultg a pressure drop across the ma poppet. The ma poppet opens and allows only enough flow to the secondary system ( Port ) matag the primary system pressure ( Port ) at the pre-set value until the pressure at secondary port rises to the same value. s soon as the pressure is equal both ports, the control piston the pilot section closes preventg loss of oil through external dra. The ma poppet opens fully and allows pressure at and to rise to a higher value than set. In such a situation the VRS works as a gate valve allowg flow either direction.

2 PILOT OPERTED SEQUENCE VLVE - Series VRS SPECIFICTIONS General Type : Pilot operated Sequence Valve Design : Poppet type Mountg : Threaded/Subplate/Cartridge/Flange Mountg position : Optional Port sizes (nomal) : 3/8, 3/, / Direction of flow : mbient temperature : -- C...+6 C (-- F...+ F) Special workg conditions : Consult VELJN Hydraulics Pressure control range : Mimum - depends on flow Maximum - psi (3 bar) Maximum operatg pressure : Port (let) psi (3 bar) Port (outlet) psi (3 bar) Port (pilot) psi (3 bar) Port, (Pilot dra ) Without pressure to tank VRS 3 ( 3/ ) VRS 6 ( 3 8 / ) VRS ( / ) Nomal flow gpm ( lpm) :.8 (6).9 () 9. () Maximum flow gpm ( lpm) : 3.8 (9) 79. (3) 8.7 (6) Fluid : Meral oil as per DIN / or other fluids on request Fluid Temperature Range : --8 C...+8 C ( F F) Viscosity Range : to 6 cst (6 to 39 SSU) Optimum operatg viscosity : 3 cst (8 SSU) Seal compatibility : Code (una N) or Code (Viton) (contact Veljan with specific oil details) Cleanless recoended : etter than NS 638 Class 8 or ISO 7/ djustment Manual : Handwheel Rotation : 3.7 rev. Operatg torque :.7 Nm Electricals ( Vent Valve VVV) : Solenoid Nomal voltage : Refer to Orderg Code Permissible voltage fluctuation : +%...--% Max. coil temperature : + C (3 F) Type of current : lternatg Current (C)/Direct Current (DC) Input power : 3 W Holdg : 78 V Inrush : 6 V Relative operatg period : % Type of protection : I P 6

3 PILOT OPERTED SEQUENCE VLVE - Series VRS ORDERING CODE VRS W7 - *** Series Size / / - / Max. Pressure of Valve ody - for cartridges only - psi (3 bar) ody Mountg Cartridge ) - Cartridge port = / NPTF ) E - Cartridge port = SE -( 7/6 -UNF) ) ) G- Cartridge port = G / Threaded body - Threaded body - VRS3 = / NPTF ; VRS6 = NPTF,ports (- Ports,-Port) = / - Threaded body VRS6 = 3/ NPTF ; NPTF VRS = / NPTF; (-Port,-Port) 6 - Threaded body VRS3 = /.S.P.P ; VRS6 =.S.P.P ; (-Ports,-Port),ports D - Threaded body VRS6 = 3/.S.P.P ; =G / VRS = /.S.P.P ; (-Port,-Port) - Threaded body VRS3 - SE - 8 VRS6 - SE - 6,ports (-Ports,-Port) =SE- - Threaded body VRS6 - SE -, (7/6 - VRS - SE - UNF) (-Port,-Port) Subplate mountg 3 - Subplate mountg - VRS3/6 / ISO ( port - / NPTF with dra le code ) ) 7 - Subplate mountg Port SE-( 7/6 -UNF) with dra le code ) 9 - Subplate mountg VRS3/6 / ISO ( Port = /.S.P.P ; with dra le code ) Flange body - Flange body (, port - / NPTF ) (-Ports,-Port) ) Only with Dra le code ) Port is only available at Dra le (code) external from pilot head. Solenoid Voltage (Omit for non vent version) Dra le Modification Seal Class - una N ( Standard) - Viton Design letter W - V/6 Hz C GOR - V DC W - 3V/6 Hz C GOQ - V DC W6 - V/ Hz C GOH - 8V DC W7-3V/ Hz C Electrical Vent (3way VENT VLVE VVV) Omit for non vent version 9 - With manual override (Solenoid de-energized : open to tank. Solenoid energized : vent le blocked) - Without manual override (Solenoid de-energized : open to tank. Solenoid energized : vent le blocked) - With manual override (Solenoid de-energized : vent le blocked Solenoid energized : open to tank) - Without manual override (Solenoid de-energized : vent le blocked Solenoid energized : open to tank) - Internal (only for cartridge) - External from subplate or manifold () - External from pilot head ( ) Type of Control -Hand knob (3 dia) -Hand knob ( dia) (not for version with vent valve VVV) 3-corn nut with lead seal Pressure settg range t subplate mountg only with body code 3,7,9 - - psi (7 - bar) psi (7 - bar) - - psi (7-3 bar)

4 PILOT OPERTED SEQUENCE VLVE - Series VRS PERFORMNCE CURVES ps m - qv characteristics 7 (.) Fluid 6 cst at C (36 Ssu at F), Test temp. C ( F) ± % VRS3 7 (.) VRS6 7 (.) VRS m.pressure settg bar (psi) 6 (87.) (7.) (8.) 3 (3.) (9.) (.) VRS3 m.pressure settg bar (psi) 6 (87.) (7.) (8.) 3 (3.) (9.) (.) m.pressure settg bar (psi) 6 (87.) (7.) (8.) 3 (3.) (9.) (.) 3 (7.9) 6 (.8) Flow lpm (gpm) 9 (3.8) (6.) (3.) Flow lpm (gpm) 3 (79.) 3 (6.) (3.) (79.) Flow lpm (gpm) Pressure Characteristics at Closg Pot = primary pressure = secondary pressure (to actuator) VRS3 VRS3 3 (7) 3 (3) time underlap 3 (7) 3 (3) Pressure underlap time underlap Pressure bar (psi) (36) (9) (7) () pressure underlap Pressure bar (psi) (36) (9) (7) () (7) (7) Response time (ms) Response time (ms)

5 PILOT OPERTED SEQUENCE VLVE - Series VRS VRS3 (3/8 ) SUPLTE MOUNTING OD ( #3, #7 & #9 ) Weight :.93 lbs (.7 kg) max Panel openg C C r øc8 C3 C øc7 ø 7 C 3 9 C6 r lock mountg face Flatness. / length Surface fish CL.7 µm D D D3 D 3/8"-6 UNC x.63 dp. (M x 6 dp.) D D6 D7 D 8 6 ø 3 ø6 D8 D9 ød3 Location hole ød ød ø ø ø ø ø.6 Ports ø3. Function C C C3 C C C6 C7 C r.7 r ø3.7 ø r 9. r ø78. ø. D D D3 D D D6 D7 D8 D9 D D D D ø.7 ø.8 x.3 dp. 3.3 ø ø7. ø7. x 8. dp. 9. ø. ( ) Pressure (let) Secondary (outlet) Remote control or vent connection ) External dra ) Optional from pilot head or subplate. Port is only available at Dra le (code ) external from the pilot head Note : For details of Subplate & mtg. screws please refer page 8

6 PILOT OPERTED SEQUENCE VLVE - Series VRS VRS3 (3/8 ) SUPLTE Weight :. lbs (. kg) 3 C C C3 C 7 8 ø ø C7 ø6 ø 3 C6 C 6 ø 9 3/8-6 UNC x.63 dp (M x 6 dp). 3 Location hole ø.9 ø.8 x.3 dp. ø ø. ø7. x 8. dp. ø7.. ø ø.6 6. ø.. ø6. C C C3 C C C6 C Order No. VSS - P G VSS G 3 + / NPTF /.S.P.P Port sizes + / NPTF /.S.P.P. Dimension 3/8-6UNC / lg. M x 3 DIN * Mountg screws are cluded subplate order. For valves ordered without subplate, mountg screws must be ordered separately. Mountg screws* Order No. m.tensile strength V38-68 V7-739 at p< bar = dan/ - (Torque 68 Nm) at p> bar = dan/ (Torque 8 Nm)

7 PILOT OPERTED SEQUENCE VLVE - Series VRS VRS3 (3/8 ) - THREDED OD ( #, # & #6 ) Weight : 7.3 lbs (3. kg) M 3 ø ø ø Ports () Function Pressure (let) Port Sizes / NPTF or G / or SE - 8 (3/ - 6 UNF) Secondary port (outlet) / NPTF or G / or SE - 8 ( 3/ - 6 UNF) ) Remote control or vent connection External dra / NPTF or G / or SE - (7/6 - UNF) / NPTF or G / or SE - ( 7/6 - UNF) ) closed when supplied

8 PILOT OPERTED SEQUENCE VLVE - Series VRS CRTRIDGE WITH PILOT VLVE VRS3 (3/8 ) ( #, #E & #G ) Weight :.3 lbs (.6 kg) max (/ NPTF or G/" or SE-) 3 7 ø6 ø7 8 r.6 6 /6" NPTF 9 r ø max ø max. 3 Only possible at external dra from the pilot head =.6 =.8 = µmra 9 8 ø Orifice position (orifice is content of delivery) 3/8 - UNF x.78 dp. (M x dp.) 3 ø ø9 ø8 max ø ø. +. ø ø8. ø ø. +. ø8. +. ø ø ±.8.. ±.8 ø ø.7 ø.6 ± ±. ø ø7.8 ø3. Ports Function Mountg screws* Pressure (Inlet) Secondary port (Outlet) External control connection ), Dra 3/8 - UNF x 3 / lg. or M x, DIN Order No. V39 - or V7-76 ) Port is only available at Dra le (code ) external from the pilot head. * Mountg screws must be ordered separately