Home>Products>Rexroth Vane pump>Rexroth R901104702 PVV4-1X/122RA15RMC Vane pump
Rexroth R901104702 PVV4-1X/122RA15RMC MODELS
Need a CAD or 3D Model?
Rexroth R901104702 PVV4-1X/122RA15RMC Vane pump
category
Rexroth Vane pump
Rexroth R901104702 PVV4-1X/122RA15RMC SPECIFICATIONS
Advance Rexroth R901104702 PVV4-1X/122RA15RMC Vane pump is your source for quality Rexroth Vane pump 4.88 Hz Characteristic rolling element frequency, BSF and accessories. shop online for home delivery or pick up in UKL Hydraulic Components Co., Ltd. one of our 10000 1.1 mm rs min . 5.9 Hz Characteristic inner ring frequency, BPFI
- Rexroth
R901104702 PVV4-1X/122RA15RMC
- 76.0 LB
- Flange Mount
- Right Hand (CW)
- 3525V38A14-1BA22R
- 3
- Flange
- 5/16 in
- Standard Pilot
- UKL Hydraulic Components Co., Ltd.2020-07-10 09:46:19
Welcome to my shop! Glad to serve you! Please send your question!
Rexroth R901104702 PVV4-1X/122RA15RMC Vane pump Specification details
- 1.25 in
- Straight w/ Key
- 3525V
- 2 7/8 in
- Buna-N
- 1800
- N/A
- SAE C, 2 Bolt
- Single Shaft Seal
- N/A
- 1800
- 1800
- N/A
- 14 gal/min @ 1200 rpm, 21 gal/min @ 1800 rpm
- N/A
- N/A
- N/A
- N/A
- N/A
- 38 gal/min @ 1200 rpm, 57 gal/min @ 1800 rpm
- 3525V38A14-1BA22R
- 2500
- 2500
- 21
- 57
- N/A
- Outlet 135° CCW from Inlet
- Outlet 90° CCW from Inlet
- 1 in Code 61
- 1 1/4 in Code 61
- 2.8
- 7.4
Rexroth R901104702 PVV4-1X/122RA15RMC Rexroth R901104702 PVV4-1X/122RA15RMC Vane pump Specification
Cross reference Rexroth R901104702 PVV4-1X/122RA15RMC Vane pump | |||||||||
---|---|---|---|---|---|---|---|---|---|
No. | Brand | m | B | C | d | L | H | D | D2 |
15BTM2122 | KOYO | - | - | 13 kN | 15 | - | - | 21 mm | - |
NAX 1223 | IKO | - | - | - | 12 | 23 mm | 9 mm | 21 mm | - |
NAX 1223Z | IKO | - | - | - | 12 | 23 mm | 9 mm | 21 mm | 27 mm |
NAXI 1223 | IKO | - | 16,5 mm | - | 12 mm | 23 mm | 9 mm | 24 mm | - |
NAXI 1223Z | IKO | - | 16,5 mm | - | 12 mm | 23 mm | 9 mm | 24 mm | 29 mm |
122FC87660 | KOYO | - | 660 mm | 15200 kN | 610 mm | - | - | 870 mm | - |
122W | Timken | - | 30 mm | 116 kN | 110 mm | - | - | 175 mm | - |
122WD2N | Timken | - | 30 mm | 116 kN | 110 mm | - | - | 175 mm | - |
122WI | Timken | - | 30 mm | 116 kN | 110 mm | - | - | 175 mm | - |
TC1220 | INA | 0,006 kg / Weight | - | - | 19,05 | - | - | 31,75 | - |
XGB41225P | SNR | - | 44 mm | 44 mm | 45 mm | - | - | 83 mm | - |
Rexroth R901085395 PVV51-1X/154-046RB15DDMC Vane pump | Cover End Pressure [Max:76.0 LB; Shaft End RPM [Max:Flange Mount; Displacement Shaft End (cu in/revolution):Right Hand (CW); Shaft Key:3525V38A14-1BA22R; Pressure Port Size, Shaft End:3; Pump Series:Flange; Shaft Length:5/16 in; Shaft End Pressure [Max:Standard Pilot; Weight:1.25 in; Pressure Port Size, Cover End:Straight w/ Key; Pump Series:3525V; Shaft Length:2 7/8 in; Seal Material:Buna-N; Max. RPM [Max:1800; Minor Diameter:N/A; Mounting Flange:SAE C, 2 Bolt; Shaft Seal Type:Single Shaft Seal; Spline Description:N/A; Cover End RPM [Max:1800; Shaft End RPM [Max:1800; Controlled Flow Rate:N/A; Cover End Flow @ RPM:14 gal/min @ 1200 rpm, 21 gal/min @ 1800 rpm; Major Diameter [Max:N/A; Major Diameter [Min:N/A; Minor Diameter [Max:N/A; Minor Diameter [Min:N/A; Relief Valve Setting:N/A; Shaft End Flow @ RPM:38 gal/min @ 1200 rpm, 57 gal/min @ 1800 rpm; Manufacturer Part No.:3525V38A14-1BA22R; Cover End Pressure [Max:2500; Shaft End Pressure [Max:2500; GPM @ 1,800 rpm, Cover End:21; GPM @ 1,800 rpm, Shaft End:57; Integral Valve Configuration:N/A; Port Orientation - Cover End:Outlet 135° CCW from Inlet; Port Orientation - Shaft End:Outlet 90° CCW from Inlet; Pressure Port Size, Cover End:1 in Code 61; Pressure Port Size, Shaft End:1 1/4 in Code 61; Displacement Cover End (cu in/revolution):2.8; Displacement Shaft End (cu in/revolution):7.4; |
Rexroth R901085381 PVV21-1X/068-018RB15DDMB Vane pump | Major Diameter [Min:76.0 LB; Shaft Length:Flange Mount; Shaft End Pressure [Max:Right Hand (CW); Cover End RPM [Max:3525V38A14-1BA22R; Port Orientation - Cover End:3; Cover End Pressure [Max:Flange; GPM @ 1,800 rpm, Shaft End:5/16 in; Spline Description:Standard Pilot; Shaft Dia.:1.25 in; Shaft Seal Type:Straight w/ Key; Pump Series:3525V; Shaft Length:2 7/8 in; Seal Material:Buna-N; Max. RPM [Max:1800; Minor Diameter:N/A; Mounting Flange:SAE C, 2 Bolt; Shaft Seal Type:Single Shaft Seal; Spline Description:N/A; Cover End RPM [Max:1800; Shaft End RPM [Max:1800; Controlled Flow Rate:N/A; Cover End Flow @ RPM:14 gal/min @ 1200 rpm, 21 gal/min @ 1800 rpm; Major Diameter [Max:N/A; Major Diameter [Min:N/A; Minor Diameter [Max:N/A; Minor Diameter [Min:N/A; Relief Valve Setting:N/A; Shaft End Flow @ RPM:38 gal/min @ 1200 rpm, 57 gal/min @ 1800 rpm; Manufacturer Part No.:3525V38A14-1BA22R; Cover End Pressure [Max:2500; Shaft End Pressure [Max:2500; GPM @ 1,800 rpm, Cover End:21; GPM @ 1,800 rpm, Shaft End:57; Integral Valve Configuration:N/A; Port Orientation - Cover End:Outlet 135° CCW from Inlet; Port Orientation - Shaft End:Outlet 90° CCW from Inlet; Pressure Port Size, Cover End:1 in Code 61; Pressure Port Size, Shaft End:1 1/4 in Code 61; Displacement Cover End (cu in/revolution):2.8; Displacement Shaft End (cu in/revolution):7.4; |
Rexroth R901085387 PVV42-1X/098-040RB15DDMC Vane pump | Displacement Shaft End (cu in/revolution):76.0 LB; Shaft Key:Flange Mount; Cover End RPM [Max:Right Hand (CW); Port Orientation - Cover End:3525V38A14-1BA22R; Minor Diameter [Max:3; Major Diameter [Min:Flange; Shaft Dia.:5/16 in; Port Orientation - Shaft End:Standard Pilot; Shaft Length:1.25 in; Model No.:Straight w/ Key; Pump Series:3525V; Shaft Length:2 7/8 in; Seal Material:Buna-N; Max. RPM [Max:1800; Minor Diameter:N/A; Mounting Flange:SAE C, 2 Bolt; Shaft Seal Type:Single Shaft Seal; Spline Description:N/A; Cover End RPM [Max:1800; Shaft End RPM [Max:1800; Controlled Flow Rate:N/A; Cover End Flow @ RPM:14 gal/min @ 1200 rpm, 21 gal/min @ 1800 rpm; Major Diameter [Max:N/A; Major Diameter [Min:N/A; Minor Diameter [Max:N/A; Minor Diameter [Min:N/A; Relief Valve Setting:N/A; Shaft End Flow @ RPM:38 gal/min @ 1200 rpm, 57 gal/min @ 1800 rpm; Manufacturer Part No.:3525V38A14-1BA22R; Cover End Pressure [Max:2500; Shaft End Pressure [Max:2500; GPM @ 1,800 rpm, Cover End:21; GPM @ 1,800 rpm, Shaft End:57; Integral Valve Configuration:N/A; Port Orientation - Cover End:Outlet 135° CCW from Inlet; Port Orientation - Shaft End:Outlet 90° CCW from Inlet; Pressure Port Size, Cover End:1 in Code 61; Pressure Port Size, Shaft End:1 1/4 in Code 61; Displacement Cover End (cu in/revolution):2.8; Displacement Shaft End (cu in/revolution):7.4; |
Rexroth R901085379 PVV21-1X/055-027RB15DDMB Vane pump | Minor Diameter [Min:76.0 LB; Shaft Seal Type:Flange Mount; Port Type:Right Hand (CW); Seal Material:3525V38A14-1BA22R; Shaft Length:3; Shaft Type:Flange; Displacement Shaft End (cu in/revolution):5/16 in; Shaft End Pressure [Max:Standard Pilot; Manufacturer Part No.:1.25 in; Port Size:Straight w/ Key; Pump Series:3525V; Shaft Length:2 7/8 in; Seal Material:Buna-N; Max. RPM [Max:1800; Minor Diameter:N/A; Mounting Flange:SAE C, 2 Bolt; Shaft Seal Type:Single Shaft Seal; Spline Description:N/A; Cover End RPM [Max:1800; Shaft End RPM [Max:1800; Controlled Flow Rate:N/A; Cover End Flow @ RPM:14 gal/min @ 1200 rpm, 21 gal/min @ 1800 rpm; Major Diameter [Max:N/A; Major Diameter [Min:N/A; Minor Diameter [Max:N/A; Minor Diameter [Min:N/A; Relief Valve Setting:N/A; Shaft End Flow @ RPM:38 gal/min @ 1200 rpm, 57 gal/min @ 1800 rpm; Manufacturer Part No.:3525V38A14-1BA22R; Cover End Pressure [Max:2500; Shaft End Pressure [Max:2500; GPM @ 1,800 rpm, Cover End:21; GPM @ 1,800 rpm, Shaft End:57; Integral Valve Configuration:N/A; Port Orientation - Cover End:Outlet 135° CCW from Inlet; Port Orientation - Shaft End:Outlet 90° CCW from Inlet; Pressure Port Size, Cover End:1 in Code 61; Pressure Port Size, Shaft End:1 1/4 in Code 61; Displacement Cover End (cu in/revolution):2.8; Displacement Shaft End (cu in/revolution):7.4; |
Rexroth R901085392 PVV51-1X/139-027RB15DDMC Vane pump | Cover End Pressure [Max:76.0 LB; Shaft End Pressure [Max:Flange Mount; Major Diameter [Min:Right Hand (CW); Model No.:3525V38A14-1BA22R; GPM @ 1,800 rpm, Cover End:3; Minor Diameter [Max:Flange; Seal Material:5/16 in; Mounting:Standard Pilot; Spline Description:1.25 in; Weight:Straight w/ Key; Pump Series:3525V; Shaft Length:2 7/8 in; Seal Material:Buna-N; Max. RPM [Max:1800; Minor Diameter:N/A; Mounting Flange:SAE C, 2 Bolt; Shaft Seal Type:Single Shaft Seal; Spline Description:N/A; Cover End RPM [Max:1800; Shaft End RPM [Max:1800; Controlled Flow Rate:N/A; Cover End Flow @ RPM:14 gal/min @ 1200 rpm, 21 gal/min @ 1800 rpm; Major Diameter [Max:N/A; Major Diameter [Min:N/A; Minor Diameter [Max:N/A; Minor Diameter [Min:N/A; Relief Valve Setting:N/A; Shaft End Flow @ RPM:38 gal/min @ 1200 rpm, 57 gal/min @ 1800 rpm; Manufacturer Part No.:3525V38A14-1BA22R; Cover End Pressure [Max:2500; Shaft End Pressure [Max:2500; GPM @ 1,800 rpm, Cover End:21; GPM @ 1,800 rpm, Shaft End:57; Integral Valve Configuration:N/A; Port Orientation - Cover End:Outlet 135° CCW from Inlet; Port Orientation - Shaft End:Outlet 90° CCW from Inlet; Pressure Port Size, Cover End:1 in Code 61; Pressure Port Size, Shaft End:1 1/4 in Code 61; Displacement Cover End (cu in/revolution):2.8; Displacement Shaft End (cu in/revolution):7.4; |
Rexroth R901085383 PVV41-1X/122-027RB15DDMC Vane pump | Pump Series:76.0 LB; Mounting:Flange Mount; Cover End Pressure [Max:Right Hand (CW); Seal Material:3525V38A14-1BA22R; Displacement Shaft End (cu in/revolution):3; Shaft Key:Flange; Controlled Flow Rate:5/16 in; Pilot Type:Standard Pilot; Pressure Port Size, Cover End:1.25 in; Shaft Seal Type:Straight w/ Key; Pump Series:3525V; Shaft Length:2 7/8 in; Seal Material:Buna-N; Max. RPM [Max:1800; Minor Diameter:N/A; Mounting Flange:SAE C, 2 Bolt; Shaft Seal Type:Single Shaft Seal; Spline Description:N/A; Cover End RPM [Max:1800; Shaft End RPM [Max:1800; Controlled Flow Rate:N/A; Cover End Flow @ RPM:14 gal/min @ 1200 rpm, 21 gal/min @ 1800 rpm; Major Diameter [Max:N/A; Major Diameter [Min:N/A; Minor Diameter [Max:N/A; Minor Diameter [Min:N/A; Relief Valve Setting:N/A; Shaft End Flow @ RPM:38 gal/min @ 1200 rpm, 57 gal/min @ 1800 rpm; Manufacturer Part No.:3525V38A14-1BA22R; Cover End Pressure [Max:2500; Shaft End Pressure [Max:2500; GPM @ 1,800 rpm, Cover End:21; GPM @ 1,800 rpm, Shaft End:57; Integral Valve Configuration:N/A; Port Orientation - Cover End:Outlet 135° CCW from Inlet; Port Orientation - Shaft End:Outlet 90° CCW from Inlet; Pressure Port Size, Cover End:1 in Code 61; Pressure Port Size, Shaft End:1 1/4 in Code 61; Displacement Cover End (cu in/revolution):2.8; Displacement Shaft End (cu in/revolution):7.4; |
Rexroth R901084887 PVV52-1X/193-045RA15DDMC Vane pump | Port Orientation - Cover End:76.0 LB; Max. RPM [Max:Flange Mount; Pump Series:Right Hand (CW); Pilot Type:3525V38A14-1BA22R; Shaft Dia.:3; Rotation:Flange; Integral Valve Configuration:5/16 in; Relief Valve Setting:Standard Pilot; Shaft Seal Type:1.25 in; Mounting:Straight w/ Key; Pump Series:3525V; Shaft Length:2 7/8 in; Seal Material:Buna-N; Max. RPM [Max:1800; Minor Diameter:N/A; Mounting Flange:SAE C, 2 Bolt; Shaft Seal Type:Single Shaft Seal; Spline Description:N/A; Cover End RPM [Max:1800; Shaft End RPM [Max:1800; Controlled Flow Rate:N/A; Cover End Flow @ RPM:14 gal/min @ 1200 rpm, 21 gal/min @ 1800 rpm; Major Diameter [Max:N/A; Major Diameter [Min:N/A; Minor Diameter [Max:N/A; Minor Diameter [Min:N/A; Relief Valve Setting:N/A; Shaft End Flow @ RPM:38 gal/min @ 1200 rpm, 57 gal/min @ 1800 rpm; Manufacturer Part No.:3525V38A14-1BA22R; Cover End Pressure [Max:2500; Shaft End Pressure [Max:2500; GPM @ 1,800 rpm, Cover End:21; GPM @ 1,800 rpm, Shaft End:57; Integral Valve Configuration:N/A; Port Orientation - Cover End:Outlet 135° CCW from Inlet; Port Orientation - Shaft End:Outlet 90° CCW from Inlet; Pressure Port Size, Cover End:1 in Code 61; Pressure Port Size, Shaft End:1 1/4 in Code 61; Displacement Cover End (cu in/revolution):2.8; Displacement Shaft End (cu in/revolution):7.4; |
Rexroth R901085385 PVV41-1X/113-018RB15DDMC Vane pump | GPM @ 1,800 rpm, Shaft End:76.0 LB; Shaft End RPM [Max:Flange Mount; Mounting Flange:Right Hand (CW); Pilot Type:3525V38A14-1BA22R; Pressure Port Size, Cover End:3; Shaft Length:Flange; Shaft End Pressure [Max:5/16 in; Shaft Type:Standard Pilot; Shaft Key:1.25 in; Port Size:Straight w/ Key; Pump Series:3525V; Shaft Length:2 7/8 in; Seal Material:Buna-N; Max. RPM [Max:1800; Minor Diameter:N/A; Mounting Flange:SAE C, 2 Bolt; Shaft Seal Type:Single Shaft Seal; Spline Description:N/A; Cover End RPM [Max:1800; Shaft End RPM [Max:1800; Controlled Flow Rate:N/A; Cover End Flow @ RPM:14 gal/min @ 1200 rpm, 21 gal/min @ 1800 rpm; Major Diameter [Max:N/A; Major Diameter [Min:N/A; Minor Diameter [Max:N/A; Minor Diameter [Min:N/A; Relief Valve Setting:N/A; Shaft End Flow @ RPM:38 gal/min @ 1200 rpm, 57 gal/min @ 1800 rpm; Manufacturer Part No.:3525V38A14-1BA22R; Cover End Pressure [Max:2500; Shaft End Pressure [Max:2500; GPM @ 1,800 rpm, Cover End:21; GPM @ 1,800 rpm, Shaft End:57; Integral Valve Configuration:N/A; Port Orientation - Cover End:Outlet 135° CCW from Inlet; Port Orientation - Shaft End:Outlet 90° CCW from Inlet; Pressure Port Size, Cover End:1 in Code 61; Pressure Port Size, Shaft End:1 1/4 in Code 61; Displacement Cover End (cu in/revolution):2.8; Displacement Shaft End (cu in/revolution):7.4; |
Rexroth R901085390 PVV42-1X/082-045RB15DDMC Vane pump | Integral Valve Configuration:76.0 LB; Shaft Type:Flange Mount; Port Type:Right Hand (CW); Spline Description:3525V38A14-1BA22R; Cover End RPM [Max:3; Minor Diameter:Flange; Mounting:5/16 in; Shaft Key:Standard Pilot; Port Orientation - Cover End:1.25 in; Max. RPM [Max:Straight w/ Key; Pump Series:3525V; Shaft Length:2 7/8 in; Seal Material:Buna-N; Max. RPM [Max:1800; Minor Diameter:N/A; Mounting Flange:SAE C, 2 Bolt; Shaft Seal Type:Single Shaft Seal; Spline Description:N/A; Cover End RPM [Max:1800; Shaft End RPM [Max:1800; Controlled Flow Rate:N/A; Cover End Flow @ RPM:14 gal/min @ 1200 rpm, 21 gal/min @ 1800 rpm; Major Diameter [Max:N/A; Major Diameter [Min:N/A; Minor Diameter [Max:N/A; Minor Diameter [Min:N/A; Relief Valve Setting:N/A; Shaft End Flow @ RPM:38 gal/min @ 1200 rpm, 57 gal/min @ 1800 rpm; Manufacturer Part No.:3525V38A14-1BA22R; Cover End Pressure [Max:2500; Shaft End Pressure [Max:2500; GPM @ 1,800 rpm, Cover End:21; GPM @ 1,800 rpm, Shaft End:57; Integral Valve Configuration:N/A; Port Orientation - Cover End:Outlet 135° CCW from Inlet; Port Orientation - Shaft End:Outlet 90° CCW from Inlet; Pressure Port Size, Cover End:1 in Code 61; Pressure Port Size, Shaft End:1 1/4 in Code 61; Displacement Cover End (cu in/revolution):2.8; Displacement Shaft End (cu in/revolution):7.4; |
Rexroth R901083429 PVV54-1X/139-113LB15DDMC Vane pump | Minor Diameter [Max:76.0 LB; Mounting Flange:Flange Mount; Pressure Port Size, Shaft End:Right Hand (CW); Shaft End Flow @ RPM:3525V38A14-1BA22R; Cover End Flow @ RPM:3; GPM @ 1,800 rpm, Cover End:Flange; Manufacturer Part No.:5/16 in; GPM @ 1,800 rpm, Shaft End:Standard Pilot; Rotation:1.25 in; Seal Material:Straight w/ Key; Pump Series:3525V; Shaft Length:2 7/8 in; Seal Material:Buna-N; Max. RPM [Max:1800; Minor Diameter:N/A; Mounting Flange:SAE C, 2 Bolt; Shaft Seal Type:Single Shaft Seal; Spline Description:N/A; Cover End RPM [Max:1800; Shaft End RPM [Max:1800; Controlled Flow Rate:N/A; Cover End Flow @ RPM:14 gal/min @ 1200 rpm, 21 gal/min @ 1800 rpm; Major Diameter [Max:N/A; Major Diameter [Min:N/A; Minor Diameter [Max:N/A; Minor Diameter [Min:N/A; Relief Valve Setting:N/A; Shaft End Flow @ RPM:38 gal/min @ 1200 rpm, 57 gal/min @ 1800 rpm; Manufacturer Part No.:3525V38A14-1BA22R; Cover End Pressure [Max:2500; Shaft End Pressure [Max:2500; GPM @ 1,800 rpm, Cover End:21; GPM @ 1,800 rpm, Shaft End:57; Integral Valve Configuration:N/A; Port Orientation - Cover End:Outlet 135° CCW from Inlet; Port Orientation - Shaft End:Outlet 90° CCW from Inlet; Pressure Port Size, Cover End:1 in Code 61; Pressure Port Size, Shaft End:1 1/4 in Code 61; Displacement Cover End (cu in/revolution):2.8; Displacement Shaft End (cu in/revolution):7.4; |
Vane Pumps | Bosch Rexroth USA
Bosch vane pumps are designed to meet the requirements of the machine tool, general machinery, and other markets where low noise, high performance, and
Fixed displacement vane pumps | Bosch Rexroth AG
Hydraulic pumps of type PVQ are vane pumps with constant displacement in mobile version
Variable vane pumps, direct controlled | Bosch Rexroth AG
Hydraulic pumps of type PV7...A are direct operated vane pumps with adjustable displacement. For limitation of the maximum flow, the pump is equipped with a
Vane pumps | Bosch Rexroth USA
Vane pumps are available in a wider range of sizes. They are used in applications requiring medium operating pressures and low noise emissions
Vane pumps | Bosch Rexroth AG
Vane pumps are available in a wider range of sizes. They are used in applications requiring medium operating pressures and low noise emissions
Rexroth R901104702 PVV4-1X/122RA15RMC Vane pump Video
Contact Us
- UKL Hydraulic Components Co., Ltd.
- AddressVia Giotto, 6, 10080 San Benigno Cavanese, Torino, Italy
Rexroth R901104702 PVV4-1X/122RA15RMC Technical Articles
Can you use a hydraulic pump as a motor? |
How do I check the hydraulic pressure on my excavator? |
How does a hydraulic pump work? |
Rexroth Vane pump CATEGORIES
- Danfoss Shut-off valves
- Rexroth Solenoid directional valve
- Rexroth PRESSURE RELIEF VALVE
- Rexroth Vane pump
- Yuken single Vane pump
- Rexroth check valve
- Yuken Double Vane pump
- DENISON vane pump
- Yuken pressure valve
- Rexroth Piston Pump
- Rexroth THROTTLE VALVE
- Yuken Piston pump
- PAKER Piston Pump
- BOSCH injector
- CUMMINS injector
- DELPHI injector
- DEUTZ injector
- COMMON RAIL injector
- Denison Vane Pumps
- High Pressure Vane Pump
- Hydraulic Gear Pump
- Hydraulic Piston Pump
- Hydraulic Vane Motor
- Hydraulic Vane Pump
- Industrial Vane Pump
- Tokimec Vane Pump
- Vickers Vane Pump
- Yuken Vane Pump