Presented by: Piston Pumps PVplus

Model max. Displacement [cm³/U] Speed [min-1] PV PV PV PV PV PV PV06363 PV PV PV PV PV BG 1 BG 2 BG 3 BG 4 BG 5 PV plus The heavy duty pump Pressure: 350 bar/ 420 bar 2800

PV plus The heavy duty pump

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

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

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

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)

PV plus The Service Friendly Pump

Changing shaft seal

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

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

PV plus Noise reduction – Pulsations Primary cause pulsation Pulsating internal forces 4 or 5 pistons under pressure, varies with piston frequency ( 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

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®

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

pistoncylinder block valve platepressure kidneysuction kidney 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 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!

PV plus Noise reduction – Pulsations

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

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

Precom-pressionvolume Location

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 % minor effect on pump noise major effect on system noise

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

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