Proportional pressure reducing valve

Transcription

1 / Proportional pressure reducing valve. Type DRE(E)/ DREM(E)... Sizes, and Up to bar Up to L/min Contents Function and configuration Symbols Ordering code Technical data Electrical data Characteristic curves Unit dimensions -7 Features - For sub-plate mounting: - Porting pattern to DIN form D and ISO 7 - For installation in manifolds - pressure ratings - Maximum pressure limitation, optional - Digital amplifier type VT- of modular design (must be ordered separately) 7

2 / Hengli hydraulic Hydraulic components Proportional pressure valves Type DRE(E)/ DREM(E)... Function and configuration The valve types DRE/DREM are pilot operated pressure reducing valves. They are used for pressure reduction. The valves consist of the pilot valve () with proportional solenoid (), main valve () with main spool assembly (), as well as an optional check valve (). Type DRE... The setting of the pressure in port is dependent on the voltage present at the proportional solenoids (). t static, proportional solenoids () breakaway, the connection from to opens and fluid can flow freely from Port to port via main spool (). When valve works, pressure fluid from port acts on the spring load side of the main spool () via pilot valve with throttle (), (7) and (), and at the same time acts on spool () effected by electromagnetic force. If pressure at port exceeds the preset value of the corresponding proportional solenoid (), then the spool () opens. Signal and pilot fluid is from port, and fluid flows to tank through spool () and port. There is pressure differential on main spool () which makes itself into controller position and keeps flow constant pressure in port as same as the setting value of the proportional solenoids (). If the pressure in the port increases and the main spool () is closed, little fluid will flow to tank via hole () and port. In order to allow free-flow from port to a check valve () can be fitted. Type DRE...and DRE... Same principle with DRE in function and pilot oil drains out from channel () and port. There is a flow control valve () fixed in the pilot valve () to relief the pilot oil. nd the overload protector () in the port can prevent the pressure from abnormally high when flow Q=. Type DREM... spring loaded pressure relief valve () can be optionally installed to prevent higher pressure in port caused by abnormal peak voltage of proportional solenoids. 7 Type DREM... Connection of pressure gauge TypeDRE... Type DRE... With check valve Without check valve DRE..-/.. DRE..-/..M 7

3 Proportional pressure valves Type DRE(E)/ DREM(E)... Hydraulic components Hengli hydraulic / Symbols DRE..-/.. DRE..-/..M DRE-/...M DRE CN-/... DRE CN-/... DREM-/...M DREM CN -/... DREM CN -/... DRE-/... DREM-/... DREC N N -/.. DREMC -/.. H H Ordering code Without maximum pressure safety =No code With maximum pressure safety = M Pilot operated = No code Pilot operated valve for size = CN (do not enter nom. size) Pilot operated valve for size and = CH (do not enter nom. size) Pilot operated valve with = CN main spool assembly for size (enter nom. size ) Pilot operated valve with = CH main spool assembly for size ( enter nom. size ) For external control electronics =No code With integrated electronics (OE) = E Nominal size = Nominal size = Nominal size = DRE - G Series = Max. pressure bar = Max. pressure bar = Max. pressure bar = Max. pressure bar =. / / / * Further information in plain text V = FKM seals No code = NR seals Pilot oil drain port No code = Inch threaded = Metric threaded For type DE(M)E: = Command/actual value -V F= Command/actual value to m K = Z = For type DE(M)E: With component plug, Without plug-in connector With component plug and plug-in connector For type DE(M)E, Supply voltage G= + V DC No code= Without check valve M = With check valve = Pilot oil drain always external, separate and zero pressure to the tank 7

4 / Hengli hydraulic Hydraulic components Proportional pressure valves Type DRE(E)/ DREM(E)... Technical data Fluid Mineral oil suitable for NR and FKM seal Phosphate ester for FKM seal Fluid temperature range - to + (NR seal) - to + (FKM seal) Viscosity range mm /s. to Degree of contamination Maximum permissible degree of fluid contamination: Class. NS or //, ISO Max. operating pressure Port, bar Port ack to tank with zero pressure Max. setting pressure Port bar ; ; ; Min. setting pressure Port Dependent with Q, see characteristic curves Pressure at current value in port =Min. settable pressure (see characteristic curves ) Max. pressure limitation(stepless) Max. pressure limition setting range setting range under Setting pressure max. pressure limition bar - + bar bar - + bar bar - + bar bar - + bar When rated pressure= bar, between ~ bar When rated pressure= bar, between ~ bar When rated pressure= bar, between ~ bar When rated pressure= bar, between ~ bar Nominal size Max. flow-rate L/min Pilot flow-rate (for pilot valve) L/min.7 to Linearity ±.% Repeatability <±% with shimmy without shimmy Magnetic creeping ±.% P max ( Hz, amplitude mss) ±.% P max Shifting time to ms (dependent with the system) Electrical data Supply voltage DC Min. solenoid current m Max. solenoid current m Coil resistance.ω at, Max. warm value :.Ω Working status Continuous Max. working enviromental temperature + Electrical connection Plug-in connector to DIN EN 7-/ISO Valve protection to DIN IP mpilfier VT 7

5 Proportional pressure valves Type DRE(E)/ DREM(E)... Hydraulic components Hengli hydraulic / Characteristic curves (Measured at ϑ oil = ±, using HLP) Pressure in port (bar) Min. setting pressure (bar) Pressure differential (bar) Pressure in port (bar) Pressure in port (bar) Pressure in port in relation to flow Pressure differential via check valve from to DRE DRE DRE DRE Input pressure/current of DRE, and Rated pressure bar Deadband 7 Input current(m) Rated pressure bar Deadband Pressure in port (bar) Pressure in port (bar) Pressure in port (bar) Pressure in port (bar) Pilot flow (L/min) 7... Pressure in port in relation to flow Pressure in port (bar) DRE DRE. Pressure of port and port DRE DRE DRE Rated pressure bar Deadband 7 Input current(m) Rated pressure bar Deadband =bar ΔP DRE =bar ΔP DRE =bar and bar ΔP DRE/ Measured flow L/min from to of type DRE, and. Magnetic creeping With flutter Without flutter Note: To get min. preset pressure pilot current is not permitted to exceed m 7 Input current(m) 7 Input current(m) 7

6 / Hengli hydraulic Hydraulic components Proportional pressure valves Type DRE(E)/ DREM(E)... Unit dimensions (Dimensions in mm) H H Φ; M. L L L M. G/ Φ L H 7 H s supplied, this port is plugged. fter removal of this plug this port can also be used as an external pilot oil drain. Space required to remove plug-in connector. Max. pressure limitation ( its application see hereinbefore "note" ) Port used for remote controlling the DRE and pressure gauge connection on DRE and DRE Locating pin Name plate 7 Pilot oil drain always external and separate to tank at zero pressure. Dead hole Valve fixing screw holes (DRE and ); (DRE) L L L () M; Valve fixing screw hole L7 L L L L Φ max Valve fixing screws: Internal hexagon screw G/T 7.-., DRE:M, DRE:M DRE:M 7 Tightening torque, M =7 Nm./mm. Requirement for mounting surface ΦD max L7 L Φ7; L Locating pin hole Dimensions of mounting surface Size O-ring (port and ) O-ring (port and ) D H Size L L L L L L L7 L L L H H H Weight kg kg kg 7

7 Proportional pressure valves Type DRE(E)/ DREM(E)... Hydraulic components Hengli hydraulic 7 / Unit dimensions (Dimensions in mm) Insert cartridge valve. M; Φ; 7 7 M. G/ 7 Φ; 7 Φ. Name plate (Port )pilot oil drain always external and separate to tank at zero pressure. Space required to remove plug-in connector. Max. pressure limitation ( its application see hereinbefore "note" ) O-ring..7 Valve fixing screw hole 7 O-ring. O-ring. Main spool assembly Retaining ring.. O-ring 7.. Retaining ring and O-ring should be fixed onto the hole before fixing the main spool. The throttle in the DREC must be ordered separately; and the cartridge assembly includes the main spool and throttle. Cannelure's diameter D can meet hole diameter D, but must pay attention don't damage the port and the valve fixing holes. Pilot lines of DRE CH and DRE CH. Pilot lines of DRE CH. Size D D D Main spool assembly ordering code ( NR) (FKM ) Valve fixing screws pcs M G/T7.-. Internal hexagon screw Tightening torque Nm Weight kg Z./mm. R.max Φ Φ C M; ±. ±. ΦD +. ΦH7( ) Φ.( ) Φ ΦD. Φ 7 ΦD Φ Φ../ ±.. Z Requirement for mounting surface. M; 77