Hydraulically pilot operated cartridge check valves Type RHC and RHCE without and with hydraulic pre-relief

Transcription

1 Hydraulically pilot operated cartridge check valves RHC and RHCE without and with hydraulic pre-relief Pressure p max = 700 bar Flow Q max = 0 lpm Symbols RHC RHCE 1. General These devices are designed as seated valves and belong to the group of stop valves according to ISO -1. Flow is blocked in the direction A d B and possible in the direction B d A. The closed passage, flow direction A d B, can be opened (released) by hydraulic control. Application o Blockage of zero-leakage cylinders when used together with leakage prone directional spool valves o Return relief for directional valves during retraction of double acting cylinders o as a hydraulically operated drain or circulation valve The valve housings are designed as screw-in cartridges. These valves are to be screwed into simply shaped tapped holes of a manifold body. The sealing of the consumer side A and B is via an O-ring and takes place at the contact area between the stepped valve body and the stepped shoulder of the core diameter at the location thread. Any standard steel drill (point angle ) automatically forms this stepped shoulder when the core diameter is drilled. Therefore reaming of the hole and bevels to help the seals slip in are not necessary. The control side Z is generally sufficiently sealed to the consumer side B via an appropriate thread tolerances of valve screw and core hole (see table with dimensions). There are versions with sealed thread and control piston available if this (minimum) leakage is disturbing. Another version features a control piston relief where a an additional leakage port is apparent. This enables opening without any damping via the pressure apparent at port A (see examples in sect. 5). The following schematic illustrations show the design and a typical installation example where the mounting hole is blocked to the outside with a tapped plug (conf. DIN 90 or 9) and seal ring (conf. DIN 7603). Versions o Valves without a pre-relief (type RHC..) The valve element is a ball. These valves allow full flow through the complete cross section A d B once they are released. The rate of operation of the piston is moderated. Abrupt opening and possible resultant relief shocks are substantially avoided. If shocks do occur during the trial run, however, an auxiliary restrictor must be provided in the control oil inlet, or a valve with a pre-relieving system must be used. o Valves with a pre-relieving system (type RHC..V) The valve component is a spherically ground piston (ball seat) with a built-in ball check valve which opens during valve relief prior to the main piston, thereby releasing a restrictor cross section for the shock-free relief, of the consumer capacities. They are used predominantly for high operating pressures and for large consumer capacities. An auxiliary restrictor in the control oil inlet amplifies the efficacy of the pre-relieving feature. Additional sealing of the control pressure side 2.5 o Valves with control piston relief (type RHCE..) Available with/without pre-relief (see above). The opening pressure is rather independent from the return pressure (p B ) with this version. This is possible because of the additional control piston relief via leakage port L. HAWE Hydraulik SE STREITFELDSTR. 73 MÜNCHEN D 75 Check valves type RHC, RHCE 7 by HAWE Hydraulik June -01

2 D 75 page 2 2. s available, main data 2.1 RHC Order example: RHC 4 V Basic type Optionally with pre-relief Size and version Nominal pilot operation ratio 2.5:1 Nominal pilot operation ratio 4.5:1 Standard version Without pre-relief /0 2/1 3/2 4/3 5/4 With pre-relief V 4V 5V 6V /3V 5/4V Version with thread and control piston sealing (direct replacement for standard versions) Without pre-relief /0 21/1 31/2 41/3 51/4 With pre-relief V 41V 51V /3V 51/4V Version with thread and control piston sealing (simple installation, non standard mounting hole) Without pre-relief 1 ) /0 23/1 /2 43/3 53/4 With pre-relief V 43V 53V /3V 53/4V Flow Q max (lpm) Pressure p max (bar) at port A, B, Z True pilot operation ratio n Main valve 2.6:1 2.6:1 2.5:1 2.5:1 2.:1 2.5:1 4.2:1 4.3:1 4.5:1 4.3:1 4.3:1 Pre-relief :1 :1 :1.9: :1 21:1 Control volume (cm 3 ) Mass (weight) approx. (g) ) RHC also available with thread M1x1.5; Order coding: RHC M1x RHCE with control piston relief via additional leakage port Order example: RHCE V Basic type Optionally with pre-relief Size and version Nominal pilot operation ratio 2.5:1 Standard version Without pre-relief With pre-relief V 4V 5V 6V Version with thread and control piston sealing (simple installation, non standard mounting hole) Without pre-relief With pre-relief V 43V 53V 63V Flow Q max (lpm) Pressure p max (bar) A, B, Z at port L Non-pressurized to the tank True pilot operation ratio n Main valve 2.6:1 2.6:1 2.5:1 2.5:1 2.:1 2.5:1 Pre-relief :1 :1 :1.9:1 Control volume (cm 3 ) Mass (weight) approx. (g)

3 D 75 page 3 3. Additional data Material Mounting Installation position Connections Spring-loaded seated ball valve All steel design; housing part on the valve side hardened, valve seat ground Screwed into location hole of a housing element Observe the dimensional tolerance of the thread core diameter D 1 in sect. 4, as well as footnote 1 ) Any Flow direction B d A Free A, B = Main opening Z = Control oil connection L = Leakage oil connection, non-pressurized to the tank A d B A d B Blocked with zero leakage in neutral position (connection Z non-pressurized) if there is no pressure at B or a lower pressure than at A Open, if the valve is pilot operated by a control pressure at Z (also see control pressure p St ) Opening pressure B d A approx. 0.5 bar; approx. 1 bar for RHC 1/0 Control pressure p st (bar) (Recommended value calculation) p for pilot operation p St = A n p for holding open p St, kp B n n Pilot-operation ratio see table Section 2 p A = Pressure at A p B = Pressure at B p see following characteristic k = 1 for RHC = for RHCE Pressure fluid Hydraulic oil conforming DIN 5 part 1 to 3: ISO VG to 6 conforming DIN 5. Viscosity limits: min. approx. 4, max. approx. 00 mm 2 /s; opt. operation approx mm 2 /s. Also suitable for biological degradable pressure fluids types HEPG (Polyalkylenglycol) and HEES (Synth. Ester) at service temperatures up to approx. +70 C. Temperature Ambient: approx C Fluid: C, Note the viscosity range! Permissible temperature during start: - C (Note start-viscosity!), as long as the service temperature is at least K higher for the following operation. Biological degradable pressure fluids: Note manufacturer s specifications. By consideration of the compatibility with seal material not over +70 C. p-q curves Flow resistance p (bar) Flow Q (lpm) Oil viscosity during the measurement approx. 60 mm 2 /s Flow resistance p (bar) Flow Q (lpm)

4 D 75 page 4 4. Unit dimensions 4.1 RHC (V), RHC... 51(V) RHC 1/0... 5/4V and RHC / /4(V) All dimensions are in mm, subject to change without notice! Location hole The mounting hole is blocked to the outside via a tapped plug (conf. DIN 90 or 9) and seal ring (conf. DIN 7603). O-ring NBR 90 Sh only with type RHC 6(V) only with type RHC 5(V) Seal ring of type RHC...51(V) 3) Hexalobular ISO (Torx TX70) G 4) l 1 l 2 l 3 d 1 d 2 O-ring Max. torque M max (Nm) RHC 1, RHC.2.7 M x1.5 RHC 1/0, RHC / x1.5 RHC 2, RHC M x1.5 1 RHC 2/1, RHC 21/ x RHC 3(V), RHC 31(V) M x RHC 3/2, RHC 31/ x2.4 0 RHC 4(V), RHC 41(V) M 30x1.5 2 RHC 4/3(V), RHC 41/3(V) x RHC 5(V), RHC 51(V) Torx M 36x RHC 5/4(V), RHC 51/4(V) TX70.07x RHC 6(V) M x x RHC 1() RHC 1/0(/0) RHC 2(21) RHC 2/1(21/1) RHC 3(31) (V) RHC 3/2(31/2) RHC 4(41) (V) RHC 4/3(41/3) (V) RHC 5(51) (V) RHC 5/4(51/4) (V) RHC 6 (V) a b c D 1 Seal ring at the 1 ) D 2 D 3 D 4 D 5 5) T 1 T 2 T 3 5) tapped plug xx xx xx x36x xx x49x2 1) D1 determines the leakage of the control line with type RHC 1...6(V) Leakage 0.05 lpm at 300 bar, when all tolerances are maintained. 2) The thread depth T 1 -b and the distance of the hole #D 3 (connection side B) T 1 -c depend on the thread core hole depth T 1. The fixed dimensions b, c, and a have to be maintained therefore. 3) Attention: Applies to type RHC... 51(V) All PTFE-swarf generated while screwing the valve in have to be thoroughly removed 4) Thread G fine tolerance 4h/5H DIN pages 21/22 5) This recess is only required with type RHC.1 to prevent damage of the seal ring

5 D 75 page RHC... 53(V) and RHC / /4(V) O-ring 1 NBR 90 Shore Location hole The mounting hole is blocked to the outside via a tapped plug (conf. DIN 90 or 9) and seal ring (conf. DIN 7603). Seal ring O-ring 2 AU 90 Shore ( RHC 43.. NBR 90 Shore) only with type RHC 53(V) Detail X Hexalobular ISO (Torx TX70) Edge deburred! max. R 0.3 G 1 ) l 1 l 2 l 3 l 4 l 5 O-ring 1 O-ring 2 RHC RHC /0 RHC 23 RHC 23/1 RHC (V) RHC /2 RHC 43(V) RHC 43/3(V) RHC 53(V) RHC 53/4(V) M x1.5 M 22x1.5 M 26x1.5 M 36x1.5 M 3x Max. torque M max (Nm) 6 x1.5 x1.7.x1.7.6x x2.4.35x x x1.7 0 Torx TX70.07x2.62.2x ) Core diameter = G -1.5 L 1 L 2 D 1 H D 2 D 3 D 4 D 5 max T 1 T 2 T T 4 t RHC RHC /0 RHC 23 RHC 23/1 RHC (V) RHC /2 RHC 43(V) RHC 43/3(V) RHC 53(V) RHC 53/4(V) Seal ring at the tapped plug xx x27x x31x xx x44x2

6 D 75 page RHCE (V) O-ring NBR 90 Shore only with type RHCE 5(V) only with type RHCE 6(V) Hexalobular ISO (Torx TX70) Location hole The mounting hole is blocked to the outside via a tapped plug (conf. DIN 90 or 9) and seal ring (conf. DIN 7603). Seal ring G 1 ) l 1 l 2 l 3 l 4 O-ring Max. torque M max (Nm) RHCE 1 M x x1.5 RHCE 2 M x x2 75 RHCE 3(V) M x x2.4 0 RHCE 4(V) M 30x x RHCE 5(V) M 36x Torx TX70.07x RHCE 6(V) M x x L 1 *0.1 L 2 *0.1 L 3 *0.1 T T 2 T D 1 D 2 D 3 D 4 D 5 Seal ring at the tapped plug RHCE xx1.5 RHCE xx1.5 RHCE 3(V) xx2 RHCE 4(V) x36x2 RHCE 5(V) xx2 RHCE 6(V) x49x2 1) Thread G Fine tolerance 4h/5H DIN, pages 21/22

7 D 75 page RHCE... 63(V) O-ring 1 90 Shore only with type RHCE 53(V) O-ring 2 90 Shore O-ring 3 90 Shore Hexalobular ISO (Torx TX70) Location hole The mounting hole is blocked to the outside via a tapped plug (conf. DIN 90 or 9) and seal ring (conf. DIN 7603). Detail X Seal ring Edge deburred! max. R 0.3 Detail Y Edge deburred! max. R 0.3 G 1 ) l 1 l 2 l 3 l 4 l 5 7 O-ring 1 O-ring 2 O-ring 3 Max. torque M max (Nm) RHCE M x x1.5 x1.7 x1.5 RHCE 23 M x x2.55x2.62.6x RHCE (V) M 27x x x2.62 1x2.5 0 RHCE 43(V) M x x x x RHCE 53(V) M x Torx TX70.07x x2.62.2x RHCE 63(V) M x x x3 34x3 350 L 1 L 2 L 3 T 1 T 2 T 3 T 4 T 5 T 6 T 7 D 1 D 2 D 3 D 4 RHCE RHCE RHCE (V) RHCE 43(V) RHCE 53(V) RHCE 63(V) D 5 D 6 D 7 D Seal ring at the tapped plug RHCE xx1.5 RHCE xx2 RHCE (V) xx2 RHCE 43(V) RHCE 53(V) RHCE 63(V) x39x2 x49x2 xx2 1) Thread G Fine tolerance 4h/5H DIN, pages 21/22

8 D 75 page 5. Examples For blocking hydraulic cylinders with zero leakage (illustrated here with additional damping of the control line) Use at dragging loads e.g. SVC acc. to D 7000/1 RHC RHC Additional return relief for high flow (A 1 /A 3 are very big) Use as idle circulation valve RHCE RHC e.g. WH 1H-G acc. to D 7470 A/1