Series PVP Variable Volume Piston Pumps - Parker HannifinThe control spool acts as a metering valve which varies the pressure behind the servo piston. As shown in Figure 1, the amount of flow produced by the Parker Parker PVP33 – Variable Volume Piston Pumps – ZeusThe control spool acts as a metering valve which varies the pressure behind the servo piston. The amount of flow produced by the Parker Piston Pump is 
Series PVP Variable Volume Piston Pumps - Parker HannifinPVP33. 33 (2.0). 39.4 (10.4). 59.0 (15.6). 27.2 kw (36.5 hp). 3000. 248 (3600). PVP41. 41 (2.5)  by the Parker Piston Pump is dependent upon the length of PVP 23 & 33 Series Variable Volume Piston Pump - ParkerPVP Series. Variable Volume. Piston Pump. Service Bulletin. Model PVP23 **** 20. Model PVP33 **** 20. Bulletin PM 1622-20-M1/USA. Parker Pumps. Parts & Medium Pressure Variable Volume Piston Pump, PVP SeriesThe Parker PVP Series provides durable variable volume hydraulic piston pumps for medium pressure applications. With a pressure rating of 3,600 psi and a PVP 23 & 33 Series Variable Volume Piston Pump - ParkerPVP Series. Variable Volume. Piston Pump. Service Bulletin. Model PVP23 **** 20. Model PVP33 **** 20. Bulletin PM 1622-20-M1/USA. Parker Pumps. Parts &