DPX160. Full Flow Sharing sectional valve D1WWDD02E

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1 DPX16 DPX16 Full Flow Sharing sectional valve D1WWDD2E

2 DPX16 Additional information This folder shows the product in the most standard configurations. Please contact Sales Dpt. for more detailed information or special request. WARNING! All specifications of this folder refer to the standard product at this date. Walvoil, oriented to a continuous improvement, reserves the right to discontinue, modify or revise the specifications, without notice. WALVOIL IS NOT RESPONSIBLE FOR ANY DAMAGE CAUSED BY AN INCORRECT USE OF THE PRODUCT. 2 D1WWDD2E

3 DPX16 Features Load Sensing technology for higher efficiency, reduced energy consumption and longer system lifetime Flow Sharing technology: in case of system saturation, flow to each actuator is proportionally reduced Control options: manual, hydraulic, electrohydraulic (proportional and on/off) Open centre for fixed displacement pump applications Closed centre for variable displacement Load Sensing pump applications Special options for vehicle applications D1WWDD2E

4 DPX16 Operational principle Introduction The DPX16 control valve adds to the standard Load Sensing valve the benefit of Flow Sharing technology. The DPX16 patented compensator maintains the margin pressure as a costant pressure drop across the spool metering area. The result is a flow to the workport dependent only on spool position. In case of flow saturation, the effective pressure drop across all spools is reduced equally. This results in proportional flow reduction at each section. Single section operation: refer to picture 1 Workport A picture 1 Workport B Inlet line Metering area Spool The main flow enters from the inlet line. crosses the metering area to the compensator and enters the bridge. The spool selects flow to workport A (as shown), performing work at the actuator with return flow to workport B, crossing spool metering as it passes to tank. With only one section active, the imbalanced compensator fully shifted to the right giving priority control to either the DPX1 inlet compensator (fixed displacement pump) or to the pump compensator (variable displacement pump) which provides spool stroke proportional flow. This action drives the piston and selector sphere to the right. The piston rod prevents the selector sphere from seating, allowing flow to the load sensing line. Piston Compensator Selector sphere LS line Multi-section operation When two functions are working at the same time, the higher pressure function is dominant. The dominant valve section performs as described in single section operation. The function at lower pressure becomes a dependent section. Workport A picture 2 Workport B Inlet line Metering area Spool Dependent section (with lower load): refer to picture 2 In the dependent section, function pressure is sensed in the spring chamber of the piston. The higher load sense pressure from the dominant section is sensed at the piston rod end, pushing the piston to the right. At the same time, load sense pressure pushes the compensator left, separating the piston and compensator. The compensator metering notches are now working in order to create an artificial pressure drop that will add to the lower load. The pressure drop across the spool metering area will then remain equal to the margin. This will guarantee the flow to be only a function of the spool position. Piston Compensator Selector sphere LS line D1WWDD2E

5 DPX16 Operational principle Flow Sharing condition In case of flow saturation, the flow demand is higher than the maximum pump flow therefore the margin pressure is reduced according to the formula: QαA P ρ Since all spools have the same pressure drop across the metering area, then all flows are reduced proportionally. This allows the operator to mantain control of all function, though at reduced speed of active functions. picture 3 Workport A Workport B Inlet line Metering area Spool Compensator as check valve: refer to picture 3 When actuator or function pressure is higher than inlet pressure, the group formed by the compensator, selector sphere and piston work together as a check valve. Workport pressure in the spring chamber of the piston is higher than inlet pressure, resulting in the entire group moving to the left. The movement seats the compensator against the left plug. The passage between inlet and workport bridge is now closed, preventing backflow from the actuator. Moreover the load sensing flow is generated by the pump and is not taken from the workport, preventing backflow from the Piston actuator. Compensator Selector sphere LS line Advantages of DPX16 Energy saving on closed centre system, is produced only required flow and pressure by the actuators. Flow Sharing allows predictability of movement even during multi-function operation. Flow passage design allows high P and T flow rate in a standard valve dimension. D1WWDD2E

6 DPX16 Working conditions This catalogue shows technical specifications and diagrams measured with mineral oil of 46 mm 2 /s - 46 cst viscosity at 4 C - 14 F temperature. Nominal flow rating Operating pressure (max.) inlet port with compensator 23 l/min 61 US gpm working ports (stand-by 14 bar - 2 psi) 16 l/min 42 US gpm inlet port P 3 bar 435 psi working ports A and B 3 bar 435 psi Back pressure (max.) on outlet port T 3 bar (1 bar with manual section) 435 psi (145 psi with manual section) Internal leakage A(B) T p = 1 bar- 145 psi con fluido e distributore a 4 C max. 9 cm 3 /min max.73 in 3 /min Fluid Mineral based oil Fluid temperature with NBR (BUNA-N) seals from -2 C to 8 C from -4 F to 176 F with FPM (VITON) seals from -2 C to 1 C from -4 F to 212 F operating range from 15 to 75 mm 2 /s from 15 to 75 cst Viscosity min. 12 mm 2 /s 12 cst max. 4 mm 2 /s 4 cst Max contamination level -/18/15 - ISO 446 NAS class 9 Ambient temperature for working conditions with mechanical devices from -4 C to 6 C from -4 F to 14 F with pneumatic and hydraulic devices from -3 C to 6 C from -22 F to 14 F with electric devices from -2 C to 5 C from -4 F to 122 F NOTE - for different conditions please contact Sales Dpt. Standard threads REFERENCE STANDARD BSP UN-UNF METRIC METRIC ISO NPTF THREAD ACCORDING TO ISO 228/1 ISO 263 BS 2779 ANSI B1.1 unified ISO 262 ISO 262 ANSI B1.2.3 CAVITY DIMENSION ACCORDING TO ISO SAE J1926 J2244 J476a DIN shape X or Y shape X or Y PORTS MAIN PORTS BSP UN-UNF METRIC PILOT PORTS BSP UN-UNF Inlet P G 3/4 Ports A and B G 3/4 Outlet T G 1 Pilot V and drain L G 1/4 1 1/16-12 (SAE12) 1 1/16-12 (SAE12) 1 5/16-12 (SAE16) 9/16-18 (SAE6) M27x2 Hydraulic pilots G 1/4 9/16-18 (SAE6) M27x2 Pneumatic pilots NPTF 1/8-27 M33x2 M14x1.5 NOTE - for different port size contact Sales Dpt. D1WWDD2E

7 DPX16 Performance data General Pressure Pressure drop inlet compensator (US gpm) 4 (psi) (bar) Flow (l/min) Pressure 4 (bar) A(B) T pressure drop (with spool type 18) (US gpm) A1(B1) T A4(B4) T A1(B1) T (psi) Flow (l/min) Spools metering curves Stand by = 14 bar / 2 psi (in) 18 (US gpm) (l/min) 15 l/min - 4 US gpm l/min - 34 US gpm l/min - 29 US gpm 9 9 l/min - 24 US gpm 2 7 l/min - 18 US gpm 6 5 l/min - 13 US gpm l/min US gpm Flow Stroke (mm) 1 l/min US gpm Pressure 4 (bar) Pressure relief valve Setting example (1 l/min / 2.6 US gpm) (US gpm) 3 bar / 435 psi 18 bar / 26 psi 8 bar / 115 psi (psi) Flow (l/min) Auxiliary valves: pressure relief valves type UL - antishock valves type US Pressure Setting example (1 l/min US gpm) (US gpm) 4 (psi) UL type (bar) 5 28 bar - 45 psi 3 23 bar psi bar - 26 psi bar - 18 psi 2 8 bar psi Flow (l/min) Pressure 4 (bar) Pressure drop in anticavitation (US gpm) UL type (psi) Flow (l/min) Pressure 4 (bar) US type 3 bar psi 26 bar psi 21 bar - 35 psi 16 bar - 23 psi 1 bar psi 5 bar psi (US gpm) (psi) Pressure 4 (bar) US type (US gpm) (psi) Flow (l/min) Flow (l/min) D1WWDD2E 7

8 DPX16 Dimensional data and hydraulic circuit Manual / hydraulic control configuration E F , va2 T2 A1 A2 p , , ,5 1.4 T B1 B2 35, , ,5 1.8 ls vb , , NOTE: Drawings and dimensions are referred to BSP thread configuration. TIPO E F mm in mm in DPX16/ DPX16/ DPX16/ DPX16/ DPX16/ TIPO E F mm in mm in DPX16/ DPX16/ DPX16/ DPX16/ DPX16/ D1WWDD2E

9 DPX16 Dimensional data and hydraulic circuit Manual / hydraulic control configuration Fixed displacement pump application A1 B1 A2 B2 T VA p VB T Variable displacement Load Sensing pump application A1 B1 A2 B T2 VA ls p VB T D1WWDD2E 9

10 DPX16 Dimensional data and hydraulic circuit Proportional electrohydraulic control configuration This configuration needs type PE or QE working section (see page 11) with pilot lines (for electrohydraulic controls) and end cover with pressure reducing and pressure relief valves. Directional valve with combined controls (see drawings below) is configurable following these directions: - if manual/hydraulic sections are between inlet cover and first electrohydraulic working sections, the section type must be standard Q or P (see page 11). - if manual/hydraulic sections are between first electrohydraulic working sections and end cover, the section must be types QA or PA (see page 11), with flow through pilot lines. E F VA1 VA2 T2 A1 A2 A p t l LS B1 B2 B3 v VB1 VB NOTE: Drawings and dimensions are referred to BSP thread configuration TIPO E F mm in mm in DPX16/ DPX16/ DPX16/ DPX16/ DPX16/ TIPO E F mm in mm in DPX16/ DPX16/ DPX16/ DPX16/ DPX16/ D1WWDD2E

11 DPX16 Dimensional data and hydraulic circuit Proportional electrohydraulic control configuration Fixed displacement pump application A1 B1 A2 B2 A3 B3 l T va1 va vb1 vb2 p v T Variable displacement Load Sensing pump application A1 B1 A2 B2 A3 B3 l T va1 va ls vb1 vb2 p v T D1WWDD2E 11

12 DPX16 Description composition Manual / hydraulic control configuration Load Sensing relief valve setting (bar) Flow on ports l/min Nr. of sections Port valves setting (bar) Electric devices supply voltage DPX16/2 / A M1A(TG3-12) / P-18(15/15)-8L.UL1(1)UL2(1) / P-I18(15/15)-8IM.UL3T / RC1A-12VDC 1 2 3a 3A 4A Proportional electrohydraulic control configuration Load Sensing relief valve setting (bar) Nr. of sections Flow on ports l/min Electric devices supply voltage Port valves setting (bar) DPX16/3/AM1A(TG3-12)/P-I18(15/15)-8IM.UL3T/qe-e18(15/15)-8eb3/PA-I18(15/15)-8IM.UL1(1)U2L(1)/rcr1A-12VDC 1 2 3A 3B 3C 4B Asembling kit 4A 3A Asembling Kit 3A 4B 2 3C 3B 3A 2 Type PA or QA working section (with pilot through and drain lines) Type PE or QE working section (with pilot and drain lines for electrohydraulic controls) Type P or Q standard section (without pilot through and drain lines) 12 D1WWDD2E

13 DPX16 Description composition 1 Main inlet configuration A: Directional valve with LEFT inlet (standard) B: Directional valve with RIGHT inlet 2 Complete inlet section M1A(TG3-12): With compensator, side inlet P and LS sports, upper outlet T port, pressure relief valve on Load Sensing signal N1A(TG3-12): Without compensator, side inlet P and LS ports, upper outlet T port, pressure relief valve on Load Sensing signal M1A(TG3-12)ELT: With compensator, unloader valve on Load Sensing signal ( twist and push operation) pressure relief valve on Load Sensing signal, side inlet P and LS ports, upper outlet T port N1A(TG3-12)ELT: Without compensator, unloader valve on Load Sensing signal, side inlet P and LS ports, upper outlet T port 3A Complete working section Q-I18(15/15)-8IM: Without port valve arrangement, double acting spool with A and B closed in neutral position, hydraulic control P-I18(15/15)-8IM.US3T: As previous with antishock valves arrangement (valve seats plugged) P-I18(15/15)-8IM.UL1(1)UL2(1): As previous with pressure relief valves on each port Q-18(15/15)-8L: Without port valve arrangement, double acting spool with A and B closed in neutral position, lever control with spring return P-18(15/15)-8L.US3T: As previous with antishock valves arrangement (valve seats plugged) 4A Complete end section RC1A: Arranged for upper T2 outlet (plugged) RC4A: Arranged for upper T2 outlet and side inlet T1 (ports plugged) 3B Complete working section Section with pilot and drain lines for electrohydraulic controls QE-E18(15/15)-8EB3: Without port valve arrangement, double acting spool with A and B closed in neutral position, double side proportional electrohydraulic control PE-E18(15/15)-8EB3.US3T: As previous with antishock valves arrangement (valve seats plugged) PE-E18(15/15)-8EB3.UL1(1)UL2(1): As previous with pressure relief valves on each port 3C Complete working section Section with pilot through and drain QA-I18(15/15)-8IM: Without port valve arrangement, double acting spool with A and B closed in neutral position, proportional hydraulic control PA-I18(15/15)-8IM.UL1(1)UL2(1): As previous with pressure relief valves on each port 4B Complete end section RCN1B: Without pressure reducing valve, external pilot V and drain L (ports open), arranged for upper T2 outlet (ports plugged) RCR1A(VLT): With pressure reducing valve, internal pilot and drain, arranged for side T2 outlet (all ports plugged) D1WWDD2E 13

14 DPX16 Options Dedicated sections for special functions are also available Inlet section with dinamic/static LS priority valve and shut off valve Outlet section with side shift clamping release with electric control 14 D1WWDD2E

15 DPX16 Notes D1WWDD2E 15

16 D1WWDD2E - 3 rd edition March 21