Pilot operated proportional directional valves
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1 /6 Pilot operated proportional directional valves 6. Type WRLE Sizes to 7 Up to 5 bar Up to L/min Contents Function and configuration Symbols Specifications Technical data -5 Electrical connection Technical data for the cable On-board electronics 7 Integrated electronics 8 Characteristic curves 9- Response time Unit dimensions -6 Features - Pilot valve N6, with control spool and sleeve in servo quality, actuated on one side, / fail-safe position whenswitched off - Control solenoid with electrical position feedback and electronics for position transducer (Lvdt DC/DC) - Main stage in servo quality with position feedback - Pilot operated /-way servo solenoid directional control valves N to N7 855
2 /6 Hengli hydraulic Hydraulic components Function and configuration Construction The valve consists of three main assemblies: Pilot valve()with control spool and sleeve, return springs,control solenoid and inductiveposition transducer Main stage()with centering springs and position feedback On-board trigger electronics () Functional description When the control solenoid is not actuated, the control spool is held by springs in the fail-safe position, and the main stage spool remains in its spring-centered mid position. In the on-board electronics, the pre-defined setpoint is compared with the actual value for the position of the main stage control spool. In the event of an error signal, the control solenoid is actuated, and the pilot spool is moved as the magnetic force changes. The flow released through the control cross-sections causes the main control spool to move. The A spool = E E- stroke is controlled proportionately to the setpoint of.5... V between... %. = W6-, W8- If the input setpoint is < ±.5 A V, the control spool is held in the springcentered, overlapped mid position. Power failure = W, W- In the event of a power failure or an open circuit, the onboard electronics cut off the electricity to the control solenoid and the pilot spool moves to the = V, V- fail-safe position, relieving the control oil chambers of the main stage. The main stage control spool is = E- held by springs in mid position. Type WRLE... LX... = W- = Q- Symbols Type WRLE... LX...E. Type WRLE... LX... a Y b a Y X b Type WRLE. LX.. T. Type WRLE... LX...ET. a X b a b 856
3 Hydraulic components Hengli hydraulic /6 Specifications With on-board electronics = E N = N6 = 6 N5 = 5 N7 ) = 7 Control spool symbols = E E- Transitional symbols With symbols: E-, E-, W-, W-, W8-, V-: P A:qv T: qv/ P :qv/ A T: qv WRL E J -LX / K = W6-, W8- = W, W- = V, V- = E- = W- = Q- ) N7 is a high-flow version of N5, ports P, A, and T have Φ mm in the main stage. Contrary to standard ISO , ports P, A, and T may be drilled to max. Φ mm in the control block. These valves therefore offer higher flow rates Q A : Q * Further information in plain text D = ZDR6DP-LX/YM With pressure reducing valve V = FKM seals No code= NR seals Interface A= Command value input ±V F= Command value input to ma Electrical connection: K = without plug-in connector, with plug to DIN 56-AM6, order plug-in connector separately Control oil inlet "x" control oil return "y" No desig. = "x" = external, "y" = external E = "x" = internal, "y" = external ET = "x" = internal, "y" = internal T = "x" = external, "y" = internal Power supply of trigger electronics = +V DC LX = Unit series to 9 (installation and connectiondimensions unchanged) J = Overlap compensation signal See characteristic curve range: ±.5V Flow characteristic: S = Progressive M = Progressive with linear fine metering P = Non-linear curve, linear (kink at %) L = Linear Nominal flow rate at bar valve pressure difference (5 bar per metering notch) N: 5 = 5 l/min = l/min 85 = 85 l/min = l/min N6: = l/min = l/min 5 = 5 l/min / N5: = l/min 7 = 7 l/min = l/min N7: = l/min = l/min 857
4 /6 Hengli hydraulic Hydraulic components Technical data eneral Design Spool type valve, pilot operated Construction Servo solenoid directional control valve N6, with position controller for pilot valve and main stage Type of mounting Subplate, mounting hole configuration N...7 to ISO -... Installation position Optional Ambient temperature range...+5 Weight kg N 8.5 N6 N5 8 N7 8 Vibration resistance, test condition Max.5g, shaken in dimensions( h) Hydraulic (measured with HLP 6, t= ±5 ) Hydraulic oil to DIN , Pressure fluid other fluids after prior consultation Viscosity range Recommended mm /s... Max. permitted mm /s... Maximum permissible degree of contamination of ) Class 8/6/ pressure fluid. Purity class to ISO (c) Flow direction See symbol Nominal flow at p = 5 bar per notch ) L/min N N6 N5 N7 see specifications Max. working pressure Ports P, A, External control oil inlet bar Ports P, A, Internal control oil inlet bar Ports T, X, Y bar 5 Min. control oil pressure in "pilot stage" bar Q max L/min Q N pilot valve Δp = 5 bar L/min Leakage of pilot valve at bar L/min < 5 < < 5 < 5 Leakage of main stage (symbols "E") at bar L/min <.5 <. <.6 <.6 Static/Dynamic Hysteresis % <., scarcely measurable Manufacturing tolerance for Q max % Response time for... % signal change (at X = bar)... % Response time for... % signal change (at X = bar)... % 5 Switch-off behavior After electrical switch-off: pilot valve in fail-safe. Main stage moves to spring-centered "mid position" Thermal drift Zero point displacement < % at T = Zero adjustment Adjustable ±5 % via valve amplifier ) The purity classes stated for the components must be complied with in hydraulic systems. Effective filtration prevents problems and also extends the service life of components. 858
5 Hydraulic components Hengli hydraulic 5 /6 Technical data Electric pilot valve N6, trigger electronics integrated in the valve Cyclic duration factor % ED Degree of protection IP 65 to DIN 5 and IEC /5 Connection Plug-in connector 6P+PE, DIN 56 Power supply Terminal A: Terminal : V Power consumption V DC min. V DC/max. V DC Ripple max. V DC VA max. External fuse A F.5 Input,"Standard"version Terminal D: U E Terminal E: Max. differential input voltage at V Test signal, "Standard" version Terminal F: U test Terminal C: Protective conductor and screen Recommended cable Calibration Differential amplifier, R i = kω... ± V V D max.8v DC E LVDT... ± V Reference V See pin assignment See pin assignment Up to m 7.75mm Up to m 7 mm Overlap and P A at +8 V, calibrated at the factory, see valve characteristic curve 859
6 /6 Hengli hydraulic Hydraulic components Electrical connection Supply V = Signal: +/ V LVDT Sign.: +/ V LVDT Sign. +/ V Version : Standard N6/ Logic or Stage Stroke //Sign. +/ V Main stage P-A //Sign. P- DC/DC LVDT V V +V Signal: +/ V Important: Pilot operated /-way servo solenoid directional control valves with positive overlap perform their function in open or closedloop-controlled axes and have approx. % overlap when switched off.this condition does not constitute an active fail-safe position. For this reason, many applications require the use of "external check valves" or certain sandwich-mounted valves, which must be taken into account during the On/Off switching sequence. Stroke For electrical data, see page 5/6 APT 5 6 Control Provided by customer Plug-in connector Valve 5 Connecting surface 6 Provided by Lixin Technical data for the cable Version: Number of wires: Line Ø: OuterØ: - Multi-core wire - Litz wire structure, extra fine wire according to VDE 95, class 6 - Protective earthing conductor, green-yellow - Cu shielding braid - Determined by the valve type, connector type and signal configuration -.75 mm² to m of length -. mm² to m of length mm mm Supply voltage VDC nom If the value falls below 8 VDC, a fast shut-down takes place internally, comparable with "Enable OFF". Also with version "F": I D E ma valve is active. I D E ma Valve is deactivated. Electric signals taken out via control electronics (e.g. actual value) must not be used for switching off safety-relevant machine functions! (see also the European standard "Safety requirements for fluid power systems and their components Hydraulics", EN ISO 98) 8
7 Hydraulic components Hengli hydraulic 7 /6 On-board electronics lock diagram/pin assignment Version A: U D-E ±V +U +5V -5V DC DC Logic k k Differential k amplifier A C D E F.5A F +V Supply V Supply zero Referencezero * U DE Command value...+/-v Actual value...+/-v rounding conductor Screening +U -5V= ref. +5V= signal ±V PD Main stage + - PID Pilotcontrol stage * Do not connect with the supply zero! Signal valve position A U DE...+V PT A U S U DE V PT A U DE...-V PT U S /-way servo solenoid directional control valve Pin assignment 6P+PE A: U D-E ± V (Ri=KΩ) Test U U E Protective grounding conductor +V V +/-V (Signal) SL V (Signal) A C D E F SL +V V V int. k k Valve Differential amplifier LVDT +-/V 86
8 8/6 Hengli hydraulic Hydraulic components Integrated electronics lock diagram/pinout Version F: I D-E...mA +U.5A F +V Supply V Supply zero +5V -5V DC DC Logic R sh Ω Differential...mA amplifier ma V Loop I FC IDE...mA Test I FC...mA rounding conductor Screening +U + PD - Main stage + - PID Pilot control stage...±v Signal valve position S U I DE...mA I DE ma I DE...mA PT S U /-way servo solenoid directional control valve I DE ma, Valve inactive Pin assignment 6P+PE F:I D-E...mA (R sh = Ω) Test R sh = Ω (max.5ω) U I=...mA Protective grounding conductor +V V S L IN OUT A C D E F S L Valve +V V Ω R sh =...ma LVDT 86
9 Hydraulic components Hengli hydraulic 9 /6 Characteristic curves (measured with HLP6, t= ±5 ) Flow rate signal function Q = f (U E ) Symbol E, W ( Q A : Q = : ) E, W ( Q A : Q = : ) Control spool with asymmetric metering notches Control spools with asymmetric metering notches are available in a ratio of : for the purpose of adaptation to differential cylinders. Flow rate Q % P- (:) - P- A-T -% -% A Stroke (%) comp. (5-5%) (5-5%) -V ,5,5 P-A -T % 6 8 V -T(:) : Y X Flow in mid position, "leakage oil pressure relief"with symbol "E", leakage oil in the two work chambers A and of the control piston gives rise to a build-up of pressure in A or, which then causes a connecting cylinder to drift out of position. In many cases, the "W" symbol is a better solution. With a setpoint of "", the control piston moves into the over-lapped mid position. In this mid position, pressure is then relieved from ports A and with % +.5% QN to T. This also supports the function of external check valves. -V V Symbol E, W ( Q A : Q = :) % % -% Flow rate Q P A-T T P-A % Stroke (%) Control spools in a differential circuit In order to produce differential circuits, valve spools with a th position are available. It is sufficient to install a nonreturn valve in the consumer lines. In addition, a control spool (symbol) with internal -P connection is employed for certain branch-oriented solutions. However, we recommend that you consult Hengli hydraulic with regard to these special symbols, as a simulation or knowledge of this type of system is usually required. comp. (5-5%) (5-5%) A -V ,5,5 6 8 V -V A with ramp without ramp 6 8 V Y X 86
10 /6 Hengli hydraulic Hydraulic components Characteristic curves (measured with HLP6, t= ±5, Δp=5 bar/control edge) Flow signal function Flow characteristic "L" Symbol V,V- qv [%] P A; T (:) T (:) P (:) P A T(:); Symbol E,E-,W6,W8- qv [%] - ) - Step compensation q V [%] q V [%] UDE[V] UDE[V] ) Off IDE[mA] ma Stroke in %. UDE[V] UDE[V] Off IDE[mA] ma Flow characteristic "P" Symbol V, V- Symbol E,E-, W6, W8- qv [%] qv [%] P A; T (:) T (:) P (:) - P ; A T(:) - - ) Step compensation %qv q V [%] q V [%] UDE[V] UDE[V] ) Off IDE[mA] Stroke in % ma. UDE[V] UDE[V] Off IDE[mA] ma
11 Hydraulic components Hengli hydraulic /6 Characteristic curves(measured with HLP6, t= ±5, Δp=5 bar/control edge) Flow signal function Flow characteristic "M" Symbol Q,version"" Symbol Q,version"5" Flow in l/min Flow in l/min Stroke in % UDE[V] UDE[V] UDE[V] UDE[V] Symbol Q,version "" Symbol Q,version "" Stroke in % Stroke in % UDE[V] UDE[V] UDE[V] UDE[V] Flow in l/min Flow in l/min Stroke in % 7 5 P A T P A T 865
12 /6 Hengli hydraulic Hydraulic components Response time (at X = bar) N Open Close U E % ms 5ms N 6 U E % ms 5ms U E % U E % 5ms ms 5ms ms U E % N 5 / U E % 5ms ms 5ms ms
13 Hydraulic components Hengli hydraulic /6 Unit dimensions (Dimensions in mm) N Φ6, Machined valve mounting surface Pilot control valve R-ring (ports P, A,, T) On-board electronics Main valve 5 Inductive position transducer (main valve) 6 Nameplate 7 R-ring.6, ports A,, P, T 8 R-ring , ports X and Y 9 Plug-in connector not included in delivery (order separately) Pressure reducing valve 7.9 X TA M6/. A 6.9 P /mm.8 Y T Valve fixing screws: - M6 5 ISO 76-.9; M A =.5Nm Required surface finish of mating piece 867
14 /6 Hengli hydraulic Hydraulic components Unit dimensions (Dimensions in mm) N A Φ Machined valve mounting surface Pilot control valve R-ring (ports P, A,, T) On-board electronics Main valve 5 Inductive position transducer (main valve) 6 Nameplate 7 R-ring.5..6, ports A,, P, T 8 R-ring, ports X and Y 9 Plug-in connector not included in delivery (order separately) Pressure reducing valve Valve fixing screws: - M6 ISO 76-.9; M A = Nm - M ISO 76-.9; M A = Nm 5 T A P M6./mm.8 X Y Required surface finish of mating piece.6.7. M
15 Hydraulic components Hengli hydraulic 5 /6 Unit dimensions (Dimensions in mm) N Φ Machined valve mounting surface 76.8 Pilot control valve R-ring (ports P, A,, T) On-board electronics Main valve 5 Inductive position transducer (main valve) 6 Nameplate 7 R-ring 7.8.6, ports A,, P, T 8 R-ring 9, ports X and Y 9 Plug-in connector not included in delivery (order separately) Pressure reducing valve Valve fixing screws: 6- M ISO 76-.9; M A = Nm X T P Y /mm.8 Required surface finish of mating piece M 869
16 6/6 Hengli hydraulic Hydraulic components Unit dimensions (Dimensions in mm) N Φ Φ Machined valve mounting surface 76.8 Pilot control valve R-ring (ports P, A,, T) On-board electronics Main valve 5 Inductive position transducer (main valve) 6 Nameplate 7 R-ring (ports A,, P, T) 8 R-ring 9, ports X and Y 9 Plug-in connector not included in delivery X T P Y M (order separately) Pressure reducing valve./mm.8 Valve fixing screws: 6- M ISO 76-.9; M A = Nm Required surface finish of mating piece 87
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