PILOT OPERATED CHECK VALVES - Nem S.p,A

1 OPERATED CHECK VALVESPARTS IN PILOT OPERATED CHECK VALVES They are non modular VALVES , arranged for in line or flanged mounting. They allow the feeding and locking of hydraulic cylinders. As the cartridge VALVES , they are made of 1 or 2 unidirectional CHECK VALVES , in which PILOT pressure opens the sealing 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 opening of the sealing poppet by PILOT pressure is on/off (from closed to totally open).

2 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 VALVES most important parameter is PILOT ratio , given a generic load P, PILOT pressure required for opening the valve is calculated dividing load by PILOT ratio:Ppil = Pp / rpWhen CHECK VALVES are used on hydraulic actuators ( 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 = Afo / Aan (>1)Cylinders Inra = Aan / Afo (<1)It s very important to remember that, in case of double effect cylinders, PILOT ratio must be always higher than areas ratio:rp > raIf this rule is not respected, then it is not possible to PILOT the CHECK valve during the cylinder IN BODYINTRODUCTION312 Afo (Full bore area) Aan (Anular area)AfoAanAanAfoPILOT OPERATED CHECK code 7:1 7.

3 1 with sealwithout sealSINGLE ACTING PILOT OPERATED CHECK VALVE Flow .. 40 l/min Max working pressure .. 210 bar Weight.. 0,5 KgAluminium BodyB1 BAA1 Flow [l/min]0 5 10 15 20 25 30 35 40 Pressure [bar] 30 25 20 15 10 5 03532==51106040106,5B1AA1B==18,548,5359, 580 6 D 1 0 0 2 A 0 0A,A1,B,B1G 3/8 PORTSS etting2,0 bar1 SPRINGPILOT RATIO707A25,0 barA1 AA code8,540= 65 =4012,512,52054A1B1= 35 =959,52038BA6D10025 Aluminium Body 5:1 5:1 6 D 1 0 0 2 A 0 0A,A1,B,B1G 1/2 PORTSS etting1,5 bar1 SPRINGPILOT RATIO505A23,5 barwith sealwithout seal04 Flow.

4 60 l/min Max working pressure .. 210 bar Weight .. 0,5 KgB1 BAA1 SINGLE ACTING PILOT OPERATED CHECK VALVE0510152025300102030405060 Pressure Drop [bar] Flow [l/min] code 7:1 SINGLE ACTING PILOT OPERATED CHECK VALVE - A1 PORT FLANGEDA luminium BodyB1 BAA1 Flow [l/min]0 5 10 15 20 25 30 35 40 Pressure [bar] 30 25 20 15 10 5 0 Flow .. 40 l/min Max working pressure .. 210 bar Weight.. 0,5 Kg6,540101060351130==AB1A1B9,5803462==O- RING AA A1 7:1 6 D 1 1 0 2 A 0 0A,B,B1G 3/8 032,0 bar1707A25,0 barA1 7with sealwithout sealSettingSPRINGPILOT codeAlluminiumDOUBLE ACTING PILOT OPERATED CHECK VALVE Flow.

5 40 l/min Max working pressure ..210 bar (Aluminium Body) Max working pressure.. 350 bar (Steel Body) Weight in steel.. 1,35 Kg Weight in aluminium ..0,64 Kg0 5 10 15 20 25 30 35 40 30 25 20 15 10 5 B1 BAA16D20027====909,5359,5=4545=1B1 AAB10=4010608,5=3262A1 AA A1 Flow [l/min]Pressure [bar] 7:1 7:1 MANIFOLDAS teelS6 D 2 0 0 2 0 0 PILOT RATIO707A 2,0 bar1 SPRING25,0 barA,B,A1,B1G 3/8 PORTS03 Settingwith sealwithout sealAluminium / Steel codeAlluminium 5:1 DOUBLE ACTING PILOT OPERATED CHECK VALVE B1 BAA16D20025===69359,5989,5===34AA1B1B515 140=49708,549= Flow.

6 60 l/min Max working pressure ..210 bar (Aluminium Body) Max working pressure.. 350 bar (Steel Body) Weight in steel.. 1,66 Kg Weight in aluminium ..0,75 Kg0404 5:16 D 2 0 0 2 0 0 RAPPORTO DI PILOTAGGIO505A bar1 MOLLA23,5 barA,B,B1G 1/2 ATTACCHIAS teelS505A1,5 bar12A,B,B1G 1/2 PILOT RATIOSPRINGS ettingwith sealwithout sealMANIFOLDPORTSA luminium / Steel Body0510152025300102030405060 Pressure Drop [bar] Flow [l/min] codeDOUBLE ACTING PILOT OPERATED CHECK VALVE Steel Body6D420C5B1 BAA1B1AB12427A1CH24302740 Flow .. 30 l/min Max working pressure .. 310 bar Weight.

7 0,65 Kg50 5:16 D 4 2 0 C S 0 0A,A1,B,B1G 3/8 PORTS 0,5 bar103 SettingSPRINGPILOT RATIO without also G 1/4 and G 1/2 , contact the Nem customer care for more code 7:1 DOUBLE ACTING PILOT OPERATED CHECK VALVE - A1/B1 FLANGED PORT 0 5 10 15 20 25 30 35 40 30 25 20 15 10 5 B1 BAA16D21027 BAA1B114103535104010=6014626,510==O-RING 9,19x2,62 O-RING 9,19x2,62 9,59,5=a9034== Flow..40 l/min Max working pressure ..210 bar (Aluminium Body) Working pressure..350 bar (Steel Body) Weight in steel.

8 1,35 Kg Weight in aluminium ..0,64 KgFlow [l/min]Pressure [bar] 7:1 0332 AluminiumASteelS6 D 2 1 0 2 0 0707A 2,0 bar125,0 barA,BG 1/4 02A1,B1G 3/8 32a 7 7 MANIFOLDPILOT RATIOSPRINGPORTSS ettingwith sealwithout sealA1 AA A1 Aluminium / Steel BodyNoteHardened seat available under NEM customer care for more codeMANIFOLDA luminiumASteelSB1 BAA16D21025AA1B1B=40=159404097016,516,56 58,515=34O-RING 15,54x2,62O-RING 15,54x2,62989,5=9,534==05101520253001020 30405060 Pressure Drop [bar] Flow [l/min] DOUBLE ACTING PILOT OPERATED CHECK VALVE - A1/B1 FLANGED PORT Flow.

9 60 l/min Max working pressure ..210 bar (Aluminium Body) Working pressure..350 bar (Steel Body) Weight in steel.. 1,63 Kg Weight in aluminium ..0,64 Kg 8 6 D 2 1 0 2 0 0 5:1 5:1 1,5 bar123,5 barA,B,G 1/2 04A1,B1 PILOT RATIOSPRINGS ettingwith sealwithout sealPORTS505 AAluminium / Steel code13B190 to Body==30301335 Flow .. 30 l/min Max working pressure ..210 bar (Aluminium Body) Weight.. 0,5 Kg Lever .. Lever/HandknobSINGLE ACTING PILOT OPERATED CHECK VALVE WITH 2 POSITIONS MANUAL SHUT OFF - LEFTL everHandknobLEVERPORTSS ettingSPRINGPILOT RATIO356 D 0 0 B A 0 0A,A1,B,B1G 3/8 03 2,7 bar15A 4,7:1with code13B190 to OPENA1508227 Aluminium ACTING PILOT OPERATED CHECK VALVE WITH 2 POSITIONS MANUAL SHUT OFF - RIGHT Flow.

10 30 l/min Max working pressure .. 210 bar (Aluminium Body) Weight.. 0,5 Kg Lever.. Lever/HandknobLeverHandknobLEVERPORTSS ettingSPRINGPILOT RATIO356 D 1 0 B A 0 0A,A1,B,B1G 3/8 03 2,7 bar15A 4,7:1with sealV1V2C1C2V1V2