PARTS IN BODY PILOT OPERATED CHECK VALVES

Transcription

1 PRTS IN ODY PILOT OPERTED CHECK VLVES

2 PRTS IN ODY PILOT OPERTED CHECK VLVES INTRODUCTION PILOT OPERTED CHECK VLVES They are non modular valves, arranged for in line or flanged mounting. They allow the feeding and locking of hydraulic cylinders. s the cartridge valves, they are made of 1 or 2 unidirectional check valves, in which pilot pressure opens the sealing poppet. This type of valve shows an excellent sealing function, while free flow is subject to the closing spring load. Cracking pressure is determined by intial opening pressure. The opening of the sealing poppet by pilot pressure is on/off (from closed to totally open). So that its use is not adviced at all for the applications on which modulation and/or control of gravitational load lowering velocity is required. This type of applications requires load holding valves LHD series. Check valves most important parameter is pilot ratio rp. Generally, given a generic load P, pilot pressure required for opening the valve is calculated dividing load by pilot ratio: Ppil Pp / rp When check valves are used on hydraulic actuators (i.e. cylinders), due to areas ratio (ra) of the actuator itself, also the effects of inner pressure must be considered. Ppil Pp / (rp ra) On the hydraulic cylinders, the areas ratio ra is calculated with reference to the type of movements: Cylinders Out (Extension) ra fo / an (>1) Cylinders In ra an / fo (<1) fo an fo an fo (Full bore area) an (nular area) It s very important to remember that, in case of double effect cylinders, pilot ratio must be always higher than areas ratio: rp > ra If this rule is not respected, then it is not possible to pilot the check valve during the cylinder extension

3 6D027 luminium ody SINGLE CTING PILOT OPERTED CHECK VLVE 1 Flow l/min Max working pressure bar Weight , Kg 9, Pressure [bar] , 3 18, 48, D PILOT RTIO 1 2,0 bar 2,0 bar 03,1,, G 3/

4 6D02 luminium ody SINGLE CTING PILOT OPERTED CHECK VLVE 1 Flow l/min Max working pressure bar Weight , Kg 9, Pressure Drop [bar] 6 8, 40 12, , 6 D PILOT RTIO :1 :1 1 1, bar 2 3, bar 04,1,, G 1/

5 6D127 luminium ody SINGLE CTING PILOT OPERTED CHECK VLVE - 1 PORT FLNGED Flow l/min Max working pressure bar Weight , Kg 1 9, 80 Pressure [bar] , O-RING 9.19x D PILOT RTIO 1 2,0 bar 2,0 bar 03,, G 3/8 1 Ø

6 6D027 luminium / Steel ody DOULE CTING PILOT OPERTED CHECK VLVE 1 Flow l/min Max working pressure bar (luminium ody) Max working pressure bar (Steel ody) Weight in steel ,3 Kg Weight in aluminium ,64 Kg 9, 90 9, Pressure [bar] , D PILOT RTIO 1 2 2,0 bar S MNIFOLD,0 bar lluminium,,1, G 3/8 Steel

7 6D02 luminium / Steel ody DOULE CTING PILOT OPERTED CHECK VLVE 1 Flow l/min Max working pressure bar (luminium ody) Max working pressure bar (Steel ody) Weight in steel ,66 Kg Weight in aluminium ,7 Kg 9, 98 9, Pressure Drop [bar] , D RPPORTO PILOT DI RTIO PILOTGGIO 0 :1 :1 1 2 MOLL , bar TTCCHI 04 3, bar lluminium,, G 1/2 S MNIFOLD Steel

8 6D4C Steel ody DOULE CTING PILOT OPERTED CHECK VLVE 1 Flow l/min Max working pressure bar Weight ,6 Kg CH 24 6 D C S 0 0 PILOT RTIO 0 : , bar,1,, G 3/8 N.. vailables also G 1/4 and G 1/2 ports. Please, contact the Nem customer care for more details

9 DOULE CTING PILOT OPERTED CHECK VLVE - 1/ FLNGED PORT 6D227 luminium / Steel ody 1 Flow l/min Max working pressure bar (luminium ody) Working pressure bar (Steel ody) Weight in steel ,3 Kg Weight in aluminium ,64 Kg 9, 90 9, 2 O-RING 9,19x2,62 a O-RING 9,19x2, , Pressure [bar] 1 Note Hardened seat available under request. Contact NEM customer care for more details D MNIFOLD 70 7 PILOT RTIO 2,0 bar,0 bar S luminium Steel 02 03, G 1/4 G 3/8 1, Ø 7 Ø 7 a

10 DOULE CTING PILOT OPERTED CHECK VLVE - 1/ FLNGED PORT 6D22 luminium / Steel ody 1 Flow l/min Max working pressure bar (luminium ody) Working pressure bar (Steel ody) Weight in steel ,63 Kg Weight in aluminium ,64 Kg 9, 98 9, O-RING,4x2, , 6 1 O-RING,4x2,62 16, 70 8, Pressure Drop [bar] D PILOT RTIO :1 1, bar :1 1 2 MNIFOLD 3, bar luminium,, G 1/2 1, Ø 8 Steel S

11 6D...00 luminium ody SINGLE CTING PILOT OPERTED CHECK VLVE WITH 2 POSITIONS MNUL SHUT OFF - LEFT C2 C1 Flow l/min Max working pressure bar (luminium ody) Weight , Kg Lever Lever/Handknob V2 V V2 V to OPEN 6 D LEVER PILOT RTIO , 2,7 bar,1,, G 3/8 Lever Handknob

12 6D... luminium ody SINGLE CTING PILOT OPERTED CHECK VLVE WITH 2 POSITIONS MNUL SHUT OFF - RIGHT C1 C2 Flow l/min Max working pressure bar (luminium ody) Weight , Kg Lever Lever/Handknob V1 V V1 13 V to OPEN 6 D LEVER 3 PILOT RTIO 4, 1 2,7 bar 03,1,, G 3/8 Lever Handknob