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Piston Pumps PVplus

Piston Pumps PVplus. PV plus The heavy duty pump. max. Displacement. Speed. Model. [min-1]. [cm³/U]. 16. 3000. PV016. BG 1. PV020. 20. 3000. PV023. 23. 3000. 32. 2800. PV032. PV040. 40. 2800. BG 2. PV046. 46. 2800. 2800. PV063. 63. PV080. 80. 2500. BG 3. 92.

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Piston Pumps PVplus

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  1. Piston Pumps PVplus

  2. PV plusThe heavy duty pump max. Displacement Speed Model [min-1] [cm³/U] 16 3000 PV016 BG 1 PV020 20 3000 PV023 23 3000 32 2800 PV032 PV040 40 2800 BG 2 PV046 46 2800 2800 PV063 63 PV080 80 2500 BG 3 92 PV092 2300 PV140 140 2400 BG 4 PV180 2200 180 PV270 270 1800 BG 5 Pressure: 350 bar/ 420 bar

  3. PV plusThe heavy duty pump

  4. PV plus Ordering Code PV046R1K1T1NMMC Compensator Seal option Through drive adapter and coupling Threads and ports Flange and shaft, K= metric flange with key shaft Rotation, R=right, L=left Displacement in cc/rev

  5. Function Standard pressure Remote pressure Load sensing Horse power pQ-control PV plus Compensators Control signal Pressure Differential pressure Differential pressure Differential pressure Swash angle Auxiliary device - Orifice, pilot valve Main orifice (LS-valve) Orifice, pilot valve with swash angle feedback LVDT, electronics, proportional solenoid

  6. PV plus General • Flexible reliable design - Modular fast acting compensators - Service friendly - Tested design • Less noise to insulate - FEM optimized housing - Pre-compression chamber • Fixed hold down mechanism - Higher self priming speed - Cold start capability • 100% thru drive capability - Multiple pump combinations • Flexible mounting interface - Metric or SAE flange/ shaft - Metric or UNC/UNF threads and ports • Flushing port is standard - Maintain fluid temperature

  7. PV plus Modular Compensators DCV for pressure selection or stand-by function with external pilot valves Pilot valves, manual or electo-proportional or DCV for direct stand-by function Compensator (remote comp., load sensing comp., with or without pilot valve)

  8. PV plus The Service Friendly Pump

  9. PV plus The Service Friendly Pump Changing shaft seal

  10. PV plus The Service Friendly Pump Changing shaft seal First assembly (new shaft) Repair (used shaft) Switch order

  11. PV plus The Service Friendly Pump Changing shaft seal New shaft Shaft seal first, then washer. Seal is located further out Used shaft Washer first, then shaft seal. Sealing lip and dust protection lip are running on a new, un-damaged area further in the pump. Replace shaft is not necessary.

  12. PV plus The Silent Pump • Primary cause for pump noise • vibration of pump body due to pulsating forces • influenced mainly by pump body design • Secondary cause for pump noise • vibration of power unit or environment induced • by flow and pressure pulsation • influenced mainly by power unit / system builder

  13. PV plus Noise reduction – Pulsations • Primary cause pulsation • Pulsating internal forces • 4 or 5 pistons under pressure, varies with piston frequency (225 Hz @ 1500 rpm) • Eg. PV046: At 350 bar, the force per piston is 8000N, which means force pulsating from 32 to 40kN at 225Hz. For PV270 the force per piston is 26500N. 4 5 3 6 2 7 1 8 9

  14. PV plus Noise reduction - Housing optimization • Added material to make the housing more rigid – less movement reduces noise. • A rigid housing does not solve the problem completely, a rigid housing has a higher natural frequency and sounds bad. • The solution is to tune the housing to deform in a predictable way. Result of a simulation of the natural vibration using the CAD programs Pro/Mechanica® and Pro/Engineer®

  15. PV plus Noise reduction – Pulsations Theoretical pulsation Speed Flow real Pulsation Position 2 Position 1 20° Rotation angle Piston speed (=Flow) Time, Rotation angle 40° Rotation

  16. PV plus Noise reduction – Pulsations piston cylinder block suction kidney valve plate pressure kidney

  17. PV plus Noise reduction – Pulsations real pulsation is caused by compression flow for the next piston to deliver flow and is taken from the pump outlet. 225 times per second (1,500 rpm) a 69 l/min pump is missing an average of 14.8 l/min (>20%) of its nominal flow! For 69 l/min piston pump at 350 bar: trapped volume: 11,1 cm³ compression volume: 0,3 cm³ compression time: 1,2 ms compression flow: 14,8 l/min

  18. PV plus Noise reduction – Pulsations

  19. PV plus Noise reduction – Pulsations • Solution • Pre-compression volume piston cylinder block pressure kidney suction kidney pre-compression volume valve plate

  20. PV plus Noise reduction – Pulsations For 69 l/min piston pump at 350 bar: trapped volume: 11,1 cm³ compression volume: 0,3 cm³ compression time: 1,2 ms refill time: 2,7 ms refill flow: 6,5 l/min

  21. PV plus Noise reduction – Pulsations

  22. PV plus Noise reduction – Pulsations

  23. PV plus Noise reduction – Pulsations • Location Precom- pression volume

  24. PV plus Noise reduction – Summary • Pump Housing Optimization reduces pump noise • absolute reduction in noise emission • frequency shift to better “sound” • Pre-compression Volume Reduces Flow and Pressure Pulsation by 40 - 60% • minor effect on pump noise • major effect on system noise

  25. PV plus Sales Successes Applications requireing • Quiet operation • High self priming speed • Wide range of compensators • Reliable Heavy Duty pumps • Through drive • Flexible mounting interface

  26. PV plus Sales Successes

  27. Thank You

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