1. Presented by: Piston Pumps PVplus

2. Model max. Displacement [cm³/U] Speed [min-1] PV016 163000 PV020203000 PV023233000 PV032 322800 PV040402800 PV046462800 PV06363 PV080802500 PV092 92 2300 PV140140 2400 PV180 180 2200 PV2702701800 BG 1 BG 2 BG 3 BG 4 BG 5 PV plus The heavy duty pump Pressure: 350 bar/ 420 bar 2800

3. PV plus The heavy duty pump

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

5. PV plus Compensators Function Standard pressure Remote pressure Load sensing Horse power pQ-control Control signal 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 Less noise to insulate - FEM optimized housing - Pre-compression chamber 100% thru drive capability - Multiple pump combinations Flushing port is standard - Maintain fluid temperature Flexible mounting interface - Metric or SAE flange/ shaft - Metric or UNC/UNF threads and ports Fixed hold down mechanism - Higher self priming speed - Cold start capability Flexible reliable design - Modular fast acting compensators - Service friendly - Tested design

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. Changing shaft seal

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

11. 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. PV plus The Service Friendly Pump Changing shaft seal

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. 9 1 2 3 45 6 7 8

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 Time, Rotation angle Speed Flow Theoretical pulsation real Pulsation Piston speed (=Flow) Position 2 Position 1 20° Rotation angle 40° Rotation

16. pistoncylinder block valve platepressure kidneysuction kidney PV plus Noise reduction – Pulsations

17. 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 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!

18. PV plus Noise reduction – Pulsations

19. pre-compression volume piston cylinder block valve plate pressure kidney suction kidney Solution Pre-compression volume

20. 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 PV plus Noise reduction – Pulsations

23. Precom-pressionvolume Location

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

27. Presented by: Thank You