Pilot Operated Check Valves

Transcription

1 Pilot Operated heck Valves Nomenclature IS graphic symbols for hydraulic system L eatures - P pplicable fluid code No designation: Petroleum-based hydraulic fluid, waterglycol hydraulic fluid : Phosphate ester hydraulic fluid Model P: series pilot operated check valve ecompression code No designation: irect operated type : ecompression type onnections : asket mount type T: Screw connection type : lange connection type Specifications Nominal diameter Maximum operating pressure MPa {kgf/cm } Maximum flow rate L/min rea ratio* The check valve opens when the pressure reaches the cracking pressure, allowing fluid to flow only in one direction. The fiuid can also be allowed to flow in the reverse direction by applying external pilot pressure to push up the check valve. decompression type incorporating a small check valve that opens before the main valve is opened is also available. Mass kg P()-- - ().:. ⅜ P()-T- - ().: P()-- -. P()-T- - ¾ {} ().: ().:. P()-- -. P()-- -. P()-T- - ¼ {} ().: ().:. P()-- - P()-- - {} ().: ().:. Note: * rea ratio () Pilot piston: Large check valve () Pilot piston: Small check valve (ecompression type) ccessories Nominal diameter : ⅜ : ¾ : ¼ : racking pressure code :. MPa {. kgf/cm } :. MPa { kgf/cm } :. MPa {. kgf/cm } :. MPa { kgf/cm } esign (The design is subject to change) rainage code No designation: xternal drain type Z: Internal drain type The external/internal drain type setting cannot be changed. Sub-plate model code The sub-plate is not provided with the valve. Order it separately as required by specifying the model code given in the table below. onnections Model exagon socket head cap bolt Tightening torque N m {kgf cm} asket mount type lange connection type R PL Nominal diameter onnection port diameter Mass kg P-M Rc⅜ ⅜ P-M Rc½ P-M Rc¾. ¾ P-M Rc P-M Rc¼. ¼ P-M Rc½. Refer to Page S- for the dimensions of the sub-plate. P()- M to { to } P()- M to { to } P()- M to { to } lange (IS SS), O-ring, mounting bolts -

2 andling pplication of internal and external drain types When port P at the outlet side is directly connected to the tank with reverse free flow as shown in figure (a), use the internal drain type. When back pressure is applied to port P at the outlet side as shown in figure (b), use the external drain type. R P P P P (a) (b) Performance curves (viscosity: mm /s {cst}) ree flow pressure drop characteristics/reverse free flow pressure drop characteristics P()- P()-T P() IRTIONL ONTROL VLVS II P()-T P()- P() P()-T P()- P()

3 Performance curves (viscosity: mm /s {cst}) Pressure drop characteristics (with the small check valve fully open) P- P- P- P- P- Minimum pilot pressure characteristics Minimum pilot pressure (MPa) { kgf/cm } Pressure to open the large valve racking pressure code: racking pressure code: racking pressure code: Pressure to open the small valve racking pressure code: Pressure at reverse free flow inlet port side (MPa) { kgf/cm } xternal dimension diagram P()- L P N M Q R rain port (inlet port of V-φ. V-φ φ -φs -φ ' ' Pilot port -φt -φu (outlet port of Mounting face (conforming standard) P()-: ISO ---- P()-: ISO ---- P()-: ISO ---- imensions Model ' ' L M N P Q R S T U V P() P() P()

4 xternal dimension diagram P()-T (outlet port of φ -Rc"L" (inlet port of rain port (Rc¼) (No drain port provided for the internal drain type) Pilot port (Rc¼) (irection can be changed by rearranging the covers.) P()-, (outlet port of (inlet port of reverse free flow) imensions L P()-T.. f.. ⅜ P()-T... ¾ P()-T. f ¼ φ IRTIONL ONTROL VLVS II lange rain port (Rc¼) (No drain port provided for the internal drain type) Pilot port (Rc¼) (irection can be changed by rearranging the covers.) exagon socket head cap bolt imensions lange exagon socket head cap bolt P()-... IS SS M P()-. f IS SS M P()- lange (IS SS) exagon socket head cap bolt: M (outlet port of (inlet port of.. rain port (Rc⅜) (Plugged in the case of the internal drain type) Pilot port flange (IS SS) -

5 Sectional structural diagram P- P- P-T P-T specifications P()- P()- P()- O-ring IS P IS P IS P O-ring IS P IS P IS P O-ring IS IS P IS P O-ring IS P IS P IS P O-ring IS P IS P IS P specifications P()-T P()-T P()-T O-ring IS IS P IS P O-ring IS P IS P IS P O-ring IS P IS P IS P P- P- specifications P()- P()- P()- O-ring IS P IS P IS O-ring IS P IS P IS O-ring IS P IS P IS O-ring IS IS IS -