Pressure sequence valve pilot operated

Transcription

1 /6 Pressure sequence valve pilot operated.4 Type DZ...L Sizes to Up to bar Up to 6 L/min Contents Function and configuration Symbols Specifications Technical data 4 Characteristic curves 4 Unit dimensions -6 Features - Sub-plate mounting - Conforms to DIN 4 4, form D, and ISO 78 - Manifold plate mounting - 4 pressure ratings - 4 adjustment elements: Rotary knob djustable bolt with protective cap Lockable rotary knob with scale Rotary knob with scale - Check valve, optional 487

2 /6 Hengli hydraulic Hydraulic components Function and configuration Pressure valves type DZ are pilot operated pressure sequence valves. They are used for pressure dependent sequence switching of a secondary circuit. The pressure sequence valves basically consist of main valve () with main spool insert (7), pilot valve () with pressure adjustment element and optional check valve (). The valve function is dependent on pilot oil drain configuration: Type DZ..-.-L/... (Control lines 4., and open; control lines 4., 4 and plugged) The pressure in port acts on the pilot spool () of the pilot valve () via the control line (4.). t the same time it acts on the spring loaded side of the main spool (7) via orifice(6). When the pressure exceeds the setting value of spring (8), the pilot spool () is moved against the spring (8). The fluid on the spring loaded side of the main spool (7) flows to port via orifice (9), control land () and control lines () and (). There is now a pressure drop at main spool (7), the connection from port to port opens to maintain the pressure set by spring (8). The leakage oil at pilot spool () is led to port internally via control line(). n optional check valve ()can be fitted for free flow from port to. Sequence valvetype DZ..-.-L/... (Control lines 4., and open; control lines 4., 4 and plugged) The function of this valve is principally the same as valve DZ..-.- L/...However, on pressure sequence valve type DZ..-.-L/... the signal is achieved externally by means of control line (4.). Sequence valve Type DZ..-.-L/... (Control lines 4., and 4 or open; control lines 4., and plugged) The function of this valve is principally the same as valve type DZ..-.-L/...However, for type DZ..-.-L/... leakage at pilot spool() must be drained to tank without pressure via line (4) or(). Pilot oil is fed to port via line() Version... and 8 Version..., ypass valve Type DZ..-.-L/... (Control lines 4. 4 or open; control lines 4., and plugged) Pressure in port acts on the pilot spool () in the pilot valve () via control line (4.). t the same time pressure in port acts on the spring loaded side of the main spool (7) via orifice (6). When the pressure in port exceeds the setting value of the spring (8), the pilot spool() is moved against the spring (8), fluid can flow from the spring loaded side of the main spool (7) into the spring chamber (7) of the pilot valve () via orifice (9) and line (6) and pressure decreases on the spring loaded side of the main spool (7).The fluid can, therefore, flow from port to with minimum pressure loss. The pilot oil in spring chamber (7) should be drained to tank without pressure via line (4) or (). n optional check valve () can be fitted for free flow from port to Without check valve With check valve 488

3 Hydraulic components Hengli hydraulic /6 Symbols DZ...L/...M... DZC...L/...M... DZ...L/...M... DZ...L/...M... DZ...L/...M... DZC...L/...M... DZ...L/... DZ...L/... DZ...L/... DZ...L/... Specification DZ Pressure sequence valve, pilot operated =No code Pilot operated valve Without main spool assembly(no mark for size) = C Pilot operated valve With main spool assembly(marked with size ) = C Nominal size = Nominal size = Nominal size = Rotary knob = djustable bolt with protective cap = Lockable rotary knob with scale = Rotary knob with scale =7 Series L L9 ( L to L9 series: unchanged installation and connection dimensions) =L L / * Further details in clear text No code = NR seals V = FKM seals No code= With check valve M = Without check valve No code= Pilot oil supply and drain internal = Pilot oil supply external and drain internal = Pilot oil supply internal and drain external = Pilot oil supply and drain external (for bypass valve, port back to tank = Pilot oil supply and drain external (for sequence valve, port connect system) = Max. secondary pressure bar = Max. secondary pressure bar = Max. secondary pressure bar. = Max. secondary pressure bar 489

4 4/6 Hengli hydraulic Hydraulic components Technical data Fluid Mineral oil suitable for NR and FKM seal Phosphate ester for FKM seal Fluid temperature range - to +8 (NR seal) - to +8 (FKM seal) Viscosity range mm /s to 8 Degree of contamination Maximum permissible degree of fluid contamination: Class 9. NS 68 or /8/, ISO446 Max.operating pressure djustable pressure Port,, bar Port bar Max. bar ;;; Min. bar Interrelated to the flow (refer to the characteristic curve) Size DZ DZ DZ Max. flow-rate L/min 4 6 Fixing position Optional Size DZ DZ DZ sub-plate mounting DZ kg pprox..6 pprox.. pprox.8. Weight DZC kg pprox.. DZC kg pprox.. Characteristic curves (Measured at t=4 ±, using HLP46) Inlet pressure (bar) ypass pressure(bar) Inlet pressure in relation to flow ( ) Size Size Size 4 6 ypass pressure in relation to flow ( ) (only for version "...") Size Size Size 4 6 The curves are valid for outlet pressure P= for the complete flow range Inlet pressure (bar) ΔP Pressure differential (bar) Minimum inlet pressure in relation to flow ( ) (= bypass pressure model "...") 6 4 Size Size Size The curves are valid for outlet pressure P= for the complete flow range ΔP-Q Characteristic curves via check valve ( ) Size Size Size

5 Hydraulic components Hengli hydraulic /6 Unit dimensions (Dimensions in mm) Ф Ф Ф H H L6 L4 L 4(6) M; Valve fixing screw holes. L L M6;6 L L4 L L6 Ф6 H L7 L8 ФDmax Ф6 L9 L 4 Ф7;6 Locating pin hole Dimensions of mounting surface 9 4./mm.8 L7 L8 L9 L Nameplate Port used for control oil drain external for use as bypass valve Port (G/4;) for control external drain when used as bypass valve, for unloading of spring chamber when used as sequence valve 4 djustment element"" djustment element"" 6 djustment element"" 7 djustment element"7" 8 Internal hexagon screw S= 9 Space required to remove the key Locating pin Valve fixing holes 4pcs (DZ, DZ); 6pcs(DZ) Requirement for mounting surface Valve fixing screws: Internal hexagon screw DZ:G/T 7.-M -.9 DZ:G/T 7.-M 6-.9 DZ:G/T 7.-M 7-.9 Tightening torque M =7 Nm It must be ordered separately, if connection plate is needed. Type: DZ: G 46/(G/8) G 46/(M8.) G 46/(G/) G 46/(M.) DZ: G 4/(G/4) G 4/ (M7 ) G 4/(G) G 4/ (M ) DZ: G 44/(G /4) G 44/ (M4 ) G 4/(G /) G 4/ (M48 ) Type 4 O-ring(Port,) O-ring(Port,) D DZ DZ DZ Type L L L L4 L L6 L7 L8 L9 L H H H DZ DZ DZ

6 6/6 Hengli hydraulic Hydraulic components Unit dimensions (Dimensions in mm) With (DZC ) or without (DZC) main spool insert Ф Ф Ф Ф8.4 Z 6 4 M8; ФH7( ).8 C R.max M6;8 Ф4 Ф6 M4; ±. 6±. Ф4 +. Ф Z Ф Nameplate Port for control oil external drain when used as bypass valve, for unloading of spring chamber when used as sequence valve Port (G/4; ) used for control oil drain external when used as pressure control or sequence valve 4 djustment element"" djustment element"" 6 djustment element"" 7 djustment element"7".6 M;8 Ф Ф Ф / /mm.8 Requirement for mounting surface 8 Internal hexagon bolt S= 9 Space required to remove the key Locating pin O-ring Main spool insert Hole Ø can meet holeø 4 at any location. It must care that connection hole and the fixing hole are not damaged. 4 This drilling is not required when used as bypass valve ack-up ring and O-ring to be inserted into this hole before fitting the main spool 6 Cartridge assembly includes main spool insert with throttle 7 O-ring O-ring O-ring 8.6 ack-up ring