PVG 120 Proportional Valve

PVG 120 Proportional Valves Technical Information 2 3520L0356 520L0356DKMH.PK.510.A6.02 520L0356 PVG 120 Proportional Valve Technical Information Contents © 2001 Sauer-Danfoss Sauer-Danfoss can accept no responsibility for possible errors in catalogues, brochures and other printed material. Sauer -Danfoss reserves the right to alter its products without prior notice. This also applies to products already ordered provided that such alterations can be made without subsequent changes being necessary in specifications already agreed. All trademarks in this material are properties of the respective companies. Sauer-Danfoss and the Sauer-Danfoss logotype are trademarks of the Sauer-Danfoss Group. All rights reserved. Frontpage: P300002.TIF., P300001.TIF, P300009.TIF, P300011.TIF, Drawing 155B569forsidefa.eps CONTENTS General...................................................................................................................................................................................3 Function.................................................................................................................................................................................5 Hydraulic systems ..............................................................................................................................................................7 Technical data......................................................................................................................................................................9 Electrical actuation ......................................................................................................................................................... 12 Modules and code numbers ....................................................................................................................................... 16 PVP, pump side modules .......................................................................................................................................... 16 Accessory modules for PVP..................................................................................................................................... 17 PVB, basic modules..................................................................................................................................................... 18 PVB, ................................................................................................................................................................................. 19 Accessories modules for PVB.................................................................................................................................. 19 PVLP, shock and suction valve ................................................................................................................................ 20 PVLA, suction valve .................................................................................................................................................... 20 PVBS, main spools....................................................................................................................................................... 21 PVM, mechanical actuation..................................................................................................................................... 22 PVMD, PVH, cover for mechanically or hydraulically operated valve ....................................................... 22 PVE, electrical actuation ........................................................................................................................................... 22 PVT, tank side modul.................................................................................................................................................. 23 PVAS, assembly kit ...................................................................................................................................................... 23 Modules for oil flow exceeding 180 l/min [47.6 US gal/min]...................................................................... 24 Technical characteristics ............................................................................................................................................... 25 Dimensions........................................................................................................................................................................ 29 System safety .................................................................................................................................................................... 32 Other operating conditions conversion factors................................................................................................... 37 Order specification ......................................................................................................................................................... 39 Module selection chart ................................................................................................................................................. 42 2 3520L0356 520L0356 GENERAL PVG 120 Proportional Valve Technical Information General Valve system Load sensing proportional valve type PVG 120 is a combined directional and flow control valve which is supplied as a valve group consisting of modules specified to match particular customer needs. The flexible nature of this valve will allow an existing valve bank to be easily adapted to suit changes in requirements. P300011.TIF General characteristics • Load-independent flow control: - Oil flow to an individual function is independent of the load of this function - Oil flow to one function is independent of the load pressure of other functions • Good regulation characteristics • Central pilot supply built in when the valves are actuated electrohydraulically • Energy-saving • Up to eight basic modules per valve group Pump side module – PVP • Built-in pressure relief valve • System pressure up to 400 bar [5800 psi] • Pressure gauge connection • Versions: - Open centre version for systems with fixed displacement pumps - Open centre version prepared for an extra relief module - Closed centre version for systems with variable displacement pumps - Closed centre version without system pressure relief valve for variable displace ment pumps with built-in pressure relief valve. Basic module – PVB • Integrated pressure compensator in channel P • Interchangeable spools • Depending on requirements the basic module can be supplied with: - Shock/suction valves - Adjustable LS pressure limiting valve for ports A and B - LS connection - Module for oil flows exceeding 180 l/min [47.6 gpm] - Different spool variants Actuation modules The basic module is always fitted with mechanical actuation PVM, which can be combined with the following as required: • Electrical actuation (12 V ––__ or 24 V ––__) - PVEH- proportional, high performance - PVEO - On/off • Cover for hydraulic remote control, PVH • Cover for mechanically actuated valve group, PVMD 4 5520L0356 520L0356 Remote controls units • PVRE, electrical control unit, 162F… • Prof 1, 162F… • PVREL, electrical control unit, 155U… • PVRES, electrical control unit, 155B… • PVRH, hydraulic control unit, 155N… Electronic accessories • EHF, low adjustment unit • EHR, ramp generator • EHS, speed control • EHSC, closed loop speed control • EHA, alarm logic • EHC, closed loop position control GENERAL PVG 120 Proportional Valve Technical Information General 4 5520L0356 520L0356 PVG 120 WITH OPEN CENTRE PVP PVG 120 WITH CLOSED CENTRE PVP PVG 120 Proportional Valve Technical Information Function When the pump is started and the main spools (1) in the individual basic modules are in neutral position, oil flows from the pump, through connection P, across the pressure adjustment spool (2) to tank. The oil flow led across the pressure adjustment spool determines the pump pressure (stand-by pressure). If a reduced stand-by pressure is required, an extra relief valve PVPH or PVPE can be used in PVP (see characteristics for neutral flow pressure, page 25). When the main spools are actuated the highest load pressure is distributed across the shuttle valve circuit (3) to the spring chamber behind the pressure adjustment spool (2) and completely or partly closes the connection to tank. The pump pressure is applied to the right-hand side of the pressure adjustment spool (2). The pressure relief valve (4) opens when the load pressure exceeds the set value, allowing pump flow to be diverted back to tank. In the basic module the compensator (5) maintains a constant pressure drop across the main spool – both when the load changes and when a module with a higher load pressure is activated. Shock and suction valves with a fixed setting (7) and the suction valves (8) on ports A and B are used to protect individual working functions against overload. In the basic module it is possible to build in an adjustable LS pressure relief valve (6) to limit the pressure from each working function. The LS pressure limiting valve saves energy: • Without LS pressure limiting valve all the oil flow to the working function will be led across the combined shock and suction valves to tank if the pressure exceeds the fixed setting of the valves. • With LS pressure limiting valve an oil flow of only about 2 l/min [0.5 US gal/min] will be led across the LS pressure limiting valve to tank if the pressure exceeds the valve setting. In the closed centre version an orifice (9) has been fitted instead of the plug. This means that the pressure adjustment spool (2) will only open to tank when the pressure in channel P exceeds the pressure relief valve setting (4). In load sensing systems the load pressure is led to the pump regulator via the LS connec- tion (10). So the orifices (11) have been removed, and a plug (12) has been fitted instead of one of the orifices. In neutral position the pump regulator will set the displacement so that leakage in the system is just compensated for. When a main spool is activated, the pump regulator will adjust the displacement so that the set differential pressure between P and LS is maintained. The pressure relief valve (4) in PVP is set for a pressure of about 30 bar [435 psi] above maximum system pressure (set at the pump or an external pressure relief valve). If the system or the pump regulation has a pressure relief valve, it is possible to use a PVPV pump side module, without integrated pressure adjustment spool and pressure relief valve. 6 7520L0356 520L0356 PVG 120 Proportional Valve Technical Information Function PVG 120 SECTIONAL DRAWING 1. Main spool 2. Pressure adjustment spool in PVP 3. Shuttle valve 4. Pressure relief valve in PVP 5. Pressure compensator in PVB 6. LS pressure relief valve in PVB 7. Shock and suction valve PVLP 8. Suction valve PVLA 9. Orifice, closed centre PVP Plug, open centre PVP 10. LS connection 6 7520L0356 520L0356 PVG 120 Proportional Valve Technical Information Hydraulic systems EXAMPLES PVG 120 with fixed displacement pump 8 9520L0356 520L0356 PVG 120 Proportional Valve Technical Information Hydraulic systems EXAMPLES PVG 120 with variable displacement pump 8 9520L0356 520L0356 PVG 120 Proportional Valve Technical Information Technical data PVG 120 VALVE GROUP MECHANICAL ACTUATION PVM HYDRAULIC ACTUATION PVH Port P continuous 350 bar [5075 psi] intermittent1) 400 bar [5800 psi] Max. pressure Port A/B 400 bar [5800 psi] Port T, static/dynamic 25 bar/40 bar [365/580 psi] Oil flow, Port P, rated max. 240/300 l/min [63.4/79.3 gpm] (see characteristics 15) Port A/B 65/95/130/180/ [17.2/25.1/34.3/47.6/ 210/240 l/min 2) 55.5/63.4 gpm 2)] Spool travel ± 8 mm [± 0.32 in] Dead band (± 25%) ± 2 mm [± 0.08 in] Max. internal leakage A/B→T, without shockvalve 90 cm3/min [5.5 in3/min] at 100 bar, 21 mm2/s A/B→ T, with shockvalve 95 cm3/min [5.6 in3/min] Oil temperature Recommended temperature 30 to 60°C [86 to 140°F] (inlet temperature) Min. temperature –30°C [–22°F] Max. temperature +90°C [+194°F] Ambient temperature –30 to +60°C [–22 to +140°F] Operating range 12 to 75 mm2/s [65 SUS to 347 SUS] Oil viscosity Min. viscosity 4 mm2/s [39 SUS] Max. viscosity 460 mm2/s [2128 SUS] Filtering Max. contamination 19/16 [19/16] (See page 38) (ISO 4406) Oil consumption in pressure reduction valve 0.4 l/min [0.1 gpm] for PVT at PVE pilot-oil supply 1) Intermittent operation: the permissible values may occur for max. 10% of every minute. 2) See page 24 regarding the ordering or conversion of valve groups for oil flows exceeding 180 l/min [47.6 gpm]. Regulation range, control lever ±19,5° Neutral position Max. spool travel PVM + PVMD 1.8 ± 3.0 N 2.5 ± 3.0 N [4.0 ± 0.7 lbf ] [5.6 ± 0.7 lbf ] Operating force PVM + PVE 1) 1.8 ± 3.0 N 2.5 ± 3.0 N [4.0 ± 0.7 lbf ] [5.6 ± 0.7 lbf ] PVM + PVH 2.4 ± 3.0 N 8.5 ± 3.0 N [5.40 ± 0.7 lbf ] [19.1 ± 0.7 lbf ] Possible control lever positions Number 2 × 5 (see page 18) 1) without voltage PVE Control range 5 to 15 bar [75 to 220 psi] Max. pilot pressure, static 35 bar [510 psi] Max. pressure on port T 1) 3 bar [45 psi] 1) It is recommended that the tank connection from the hydraulic remote control unit PVRH is taken direct to tank. 10 11520L0356 520L0356 PVG 120 Proportional Valve Technical Information Technical data PVE ELECTRICAL ACTUATION PVEO PVEH Actuation ON/OFF Proportional High Hysteresis (applies to the electrical actuation only) 1) Typical - 4% Reaction time from neutral position to max. spool travel Typical 250 ms 250 ms Max. 350 ms 280 ms Reaction time from max. spool travel to neutral position2) Typical 240 ms 150 ms Max. 330 ms 200 ms Pilot oil flow pr. PVE Neutral position without voltage 0 l/min / [US/gal min] Locked with voltage 3) 0 l/min / [US/gal min] Enclosure to IEC 529 IP 65 1) The hysteresis is stated at rated and f = 0,02 Hz for a cycle. One cycle includes the movement from neu- tral position to max. spool travel direction A, via neutral position to max. spool travel in direction B, and back to neutral position. Further information can be obtained by contacting the Sales Organization for Sauer-Danfoss. 2) Reaction times for PVEH is reduced by 20 by 30 ms if the voltage is not interrupted during the neutral positioning (remote control lever without neutral position switch). 3) Total oil consumtion for a spool movement from N to full A or B: 0.0035 l [0.0009 US gal] Actuation PVEO, ON/OFF PVEH, Proportional High Rated voltage 12 V –– __ 24 V –– __ Supply voltage (UDC) Range 11 to 15 V 22 to 30 V Max. ripple (PVEH) 5% Current consumtion at rated voltage 0.65 A 0.33 A Signal voltage (PVEH) Neutral 0.5 × UDC Regulating 0.25 × UDC to 0.75 × UDC Signal current at rated voltage (PVEH) 0.25 mA 0.5 mA Input impedance at 0,5 × UDC (PVEH) 12 kW Power consumption 8 W Max. load –100 mA –60 mA Fault monitoring (PVEH aktiv) Reaction time at fault 500 ms Fault monitoring (PVEH passiv) Reaction time at fault 250 ms 10 11520L0356 520L0356 PVG 120 Proportional Valve Technical Information Technical data PVPE, ELECTRICAL RELIEF VALVE, NORMALLY OPEN Max. operation pressure 350 bar [5085 psi] Max. pressure drop a an flow of 0.20 l/min. [0.053 US gal/min] 1.2 bar [17 psi] Recommended temperature 30 to 60°C [86 to 140°F] Oil temperature (inlet temperature) Min. temperature –30°C [–22°F] Max. temperature +90°C [+194°F] Max. coil surface temperature 155°C [311°F] Ambient temperature –30 to +60°C [–22 to +140°F] Operating range 12 to 75 mm2/s [65 to 347 SUS] Oil viscosity Min. viscosity 4 mm2/s [39 SUS] Max. viscosity 460 mm2/s [2128 SUS] Response time for pressure relief to tank 600 ms Enclosure to. IEC 529 IP 65 Rated voltage 12 V 24 V Max.permissible deviation from rated supply voltage ± 10 % ± 10 % Current consumption at 22°C [72°F] coil temperature 1.55 A 0.78 A at rated voltage at 85°C [230°F] coil temperature 1.00 A 0.50 A Power consumption at 22°C [72°F] coil temperature 19 W 19 W at 85°C [230°F] coil temperature 12 W 12 W 12 13520L0356 520L0356 Main features of PVEO: • Compact • Robust operation PVEH adjusts the main spool position so that it corresponds to an electrical control signal – for example from a remote control unit. The control signal (set-point signal) is converted into a hydraulic pressure which moves the main spool. The position of the main spool is converted in the positional transducer (C) to an electric signal (feed-back signal). This signal is registered by the electronics. The variation between the set-point signal and feed-back signal actuates the solenoid valves. Thus the hydraulic pressure moves the main spool into the correct position. Special features of PVEH: • Inductive transducer, see page 13 • Integrated pulse width modulation, see page 13 • Short reaction time • Low hysteresis • Fault monitoring, see page 13 and 14 • Transistor output for signal source, see page 13 and 14 PVG 120 Proportional Valve Technical Information Electrical actuation PVEO, ON-OFF PVEH, PROPORTIONAL HIGH 12 13520L0356 520L0356 LVDT, Inductive transducer (Linear Variable Differential Transformer). When the main spool is moved a voltage is induced proportional to the spool position. The use of LVDT gives contact-free (proximity) registration of the main spool position. This means an extra-long working life and no limitation as regards the type of hydraulic fluid used. In addition, LVDT gives a precise position signal of high resolution. Integrated pulse width modulation Positioning of the main spool in PVEH is based on the pulse width modulation principle. As soon as the main spool reaches the required position, modulation stops and the spool is locked in position. The fault monitoring system A fault monitoring system is provided in all PVEH models. The system is available in two versions: • The active fault monitoring type, which provides a warning signal and deactivates the solenoid valves, and: • the passive fault monitoring type, which provides a warning signal only. See figure below. Both active and passive fault monitoring systems are triggered by 3 main events: Input signal monitoring: The input signal voltage is continuously monitored. The legal range is between 15% and 85% of the supply voltage. Outside the range and this section will switch into an active error state. Transducer supervision: If one of the wires to the LVDT sensor is broken or shorted, this section will switch into an active error state. Supervision of the closed loop: The actual position must always correspond to the demanded position (input signal). When the distance from neutral to the actual position is longer than the demanded distance, the system detects an error and will switch into an active error state. On the other hand, a situation where the actual position is closer to neutral than that demanded will not cause an error state. This situation is considered as “in control”. When an active error state occurs, the fault monitoring logic will be triggered: Note: The neutral deadband prevents the output signal from releasing the fault monitoring logic, thus stopping the function until the required pilot oil pressure has been developed. Active fault monitoring: • A delay of 500 ms before anything happens. • The solenoid valve bridge will be disabled – all solenoids will be