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Series PAVC Hydraulics Variable Volume, Piston …

Series pavc . Hydraulics Variable volume , Piston Pumps Catalog 2600-101/USA. Variable volume Piston Pumps Introduction Series pavc . Quick Reference Data Chart Pump Delivery *Approx. Noise Levels dB(A) Horsepower At Pressure Pump Displacement @ 300 PSI (21 bar) @ Full Flow 1800 RPM (1200 RPM) Operating 1800 RPM, and At PSI (bar). Model CM3/REV in GPM (LPM) Speed RPM. (IN3/REV) 500 PSI 1000 PSI 2000 PSI 3000 PSI Maximum Pressure (Maximum) Continuous 1200 RPM 1800 RPM (34 bar) (69 bar) (138 bar) (207 bar) & Displacement (Maximum). PAVC33 33 ( ) ( ) ( ) 75 (69) 76 (72) 78 (75) 79 (77) 3000 3000 (207). PAVC38 38 ( ) ( ) ( ) 75 (69) 76 (72) 78 (75) 79 (77) 3000 3000 (207). PAVC65 65 ( ) ( ) ( ) 77 (75) 78 (76) 80 (78) 81 (79) 3000 3000 (207). PAVC100 100 ( ) ( ) ( ) 83 (77) 82 (78) 82 (79) 85 (80) 2600 3000 (207). * Since many variables such as mounting, tank style, plant layout, etc.

Parker Hannifin Corporation Hydraulic Pump/Motor Division Otsego, MI 49078 Variable Volume Piston Pumps Hydraulics 2 Introduction Series PAVC Features

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Transcription of Series PAVC Hydraulics Variable Volume, Piston …

1 Series pavc . Hydraulics Variable volume , Piston Pumps Catalog 2600-101/USA. Variable volume Piston Pumps Introduction Series pavc . Quick Reference Data Chart Pump Delivery *Approx. Noise Levels dB(A) Horsepower At Pressure Pump Displacement @ 300 PSI (21 bar) @ Full Flow 1800 RPM (1200 RPM) Operating 1800 RPM, and At PSI (bar). Model CM3/REV in GPM (LPM) Speed RPM. (IN3/REV) 500 PSI 1000 PSI 2000 PSI 3000 PSI Maximum Pressure (Maximum) Continuous 1200 RPM 1800 RPM (34 bar) (69 bar) (138 bar) (207 bar) & Displacement (Maximum). PAVC33 33 ( ) ( ) ( ) 75 (69) 76 (72) 78 (75) 79 (77) 3000 3000 (207). PAVC38 38 ( ) ( ) ( ) 75 (69) 76 (72) 78 (75) 79 (77) 3000 3000 (207). PAVC65 65 ( ) ( ) ( ) 77 (75) 78 (76) 80 (78) 81 (79) 3000 3000 (207). PAVC100 100 ( ) ( ) ( ) 83 (77) 82 (78) 82 (79) 85 (80) 2600 3000 (207). * Since many variables such as mounting, tank style, plant layout, etc.

2 , effect noise levels, it cannot be assumed that the above readings will be equal to those in the field. The above values are for guidance in selecting the proper pump. Noise levels are A-weighted, mean sound pressure levels at 1 meter from the pump, measured and recorded in accordance with applicable ISO and NFPA standards. Parker Hannifin Corporation 1 hydraulic Pump/Motor Division Hydraulics Otsego, MI 49078. Variable volume Piston Pumps Introduction Series pavc . PUMP REPLACEABLE HYDRODYNAMIC REAR. HOUSING PORT PLATE BEARING COVER. SEALED. BEARING. SHAFT. SEAL. CYLINDER SERVO. BARREL Piston . Features Controls High Strength Cast-Iron Housing Pressure Compensation Built-In Supercharger Load Sensing High Speed Capability - 3000 RPM Horsepower (Torque) Limiting (2600 RPM PAVC100) Horsepower and Load Sensing Sealed Shaft Bearing Remote Pressure Compensation Two Piece Design For Ease of Service Adjustable Maximum volume Stop Cartridge Type Controls - Field Changeable Electrohydraulic Pressure Replaceable Bronze Clad Port Plate Electrohydraulic Flow & Pressure (Servo Control).

3 Airbleed Standard for Quick Priming Low Pressure Standby Hydrodynamic Cylinder Barrel Bearing Thru-Shaft (PAVC100 Only). Full Pressure Rating On Water Glycol Fluids Pump Case and Shaft Seal - See Inlet Pressure Only Filter And/Or Cool Drain Line (100 PSI Max.). Parker Hannifin Corporation 2 hydraulic Pump/Motor Division Hydraulics Otsego, MI 49078. Variable volume Piston Pumps Introduction Series pavc 33/38/65/100. General Description All control is achieved by the proper positioning of the of the swash plate. When the swash plate is in a swash plate. This is achieved by a servo Piston acting vertical position, perpendicular to the centerline of on one end of the swash plate working against the the Piston barrel, there is no Piston stroke and combined effect of the off-setting forces of the pistons consequently no fluid displacement. When the swash and centering spring on the other end.

4 The control plate is positioned at an angle, the pistons are forced spool acts as a metering valve which varies the in and out of the barrel and fluid displacement takes pressure behind the servo Piston . place. The greater the angle of the swash plate, the As shown in Figure 1, the amount of flow produced by greater the Piston stroke. the Parker Piston Pump is dependent upon the length The centerline of the pumping Piston assembly is offset of stroke of the pumping pistons. This length of stroke, from the centerline of the swash plate. Therefore, as in turn, is determined by the position of the swash shown on the accompanying Figure 1A, the pistons'. plate. Maximum flow is achieved at an angle of 17 . effective summation force tends to destroke the swash The rotating Piston barrel, driven by the prime mover, plate to a vertical (neutral) position.

5 This destroking moves the pistons in a circular path and the Piston force is balanced as the swash plate is angled by the slippers are supported hydrostatically against the face force of the servo Piston . ROTATING. Piston . BARREL. PUMPING SUMMATION OF. Piston OUTPUT Piston FORCES. DRIVE. SHAFT. INPUT. SERVO Piston . OIL FLOW. SWASH. PLATE. FIGURE 1. Pumping Action FIGURE 1A. Parker Hannifin Corporation 3 hydraulic Pump/Motor Division Hydraulics Otsego, MI 49078. Variable volume Piston Pumps Control Options Series pavc 33/38/65/100. Pressure Compensated Control Swash plate angle controls the output flow of the pump. below compensator control setting, the control spool Swash plate angle is controlled by the force generated moves up, bringing the pump to maximum against the swash plate by the pumping pistons and displacement. by the force of the servo Piston .

6 The force of the servo Piston is greater than the force of the pumping pistons P Adjustment of pavc Pumps when both are at the same pressure. PROCEDURE: By means of internal porting, pressure is connected a. Standard Pressure Compensated Pump from the output port to the servo Piston via orifice (E), Pumps are shipped from factory with a differential and to the control spool via passage (D). Also pressure pressure of approximately 150 PSI (10 bar) on pavc . is applied to the control spool chamber thru orifice 33/38/65, pavc 100 is 300 PSI (21 bar) at 50% of (F). As long as the pressures at both ends of the maximum swash angle. Differential pressure will control spool remain equal, the spool will remain offset not normally change through the life of the pump. If upward, due to the added force of the spring. this control has been tampered with, a close When pressure reaches the setting of the compensator approximation of the correct setting can be made control, the dart leaves its seat causing the pressure as follows: in the spool chamber to be reduced.

7 The spool now Dead head the pump (no flow) with a 0-3000 PSI. moves downward causing pressure in the servo Piston (0-207 bar) gauge in the OUTLET (not the low cavity to vent via port A . The reduced pressure at signal B port), back the pressure compensator the servo Piston allows the servo Piston to move to adjustment out (full counterclockwise). the right. This movement reduces the angle of the The gauge should read between 325-375 PSI. swash plate and thereby reduces the pumps output (22-26 bar) pavc 33, 38 & 65, 500-575 PSI. flow. (34-40 bar) pavc 100. If the gauge reads different As pump pressure on the control spool drops below than this, turn the differential adjustment knob pressure and spring force in the spool chamber, the (Differential Option 4) or add/remove shims (Omit control spool moves upward to maintain an equilibrium Option) until correct PSI figure is reached.

8 On both sides of the spool. If pump pressure falls CONTROL OPTION - OMIT'. (AT CONSTANT SPEED). SWASHPLATE AIRBLEED VALVE. ASSEMBLY FLOW. Piston OUTLET. PRESSURE. INLET BARREL. D. Piston . SERVO Piston E CONTROL. SPOOL AND. SLEEVE. F. CONTROL DRAIN CONTROL SPOOL. PORT A SPRING CHAMBER. PRESSURE DIFFERENTIAL. COMPENSATOR ADJUSTMENT. ADJUSTMENT. Parker Hannifin Corporation 4 hydraulic Pump/Motor Division Hydraulics Otsego, MI 49078. Variable volume Piston Pumps Control Options Series pavc 33/38/65/100. Remote Pressure Control Control Type (M). Remote control of the pavc output pressure can be concept, multiple, remotely piloted relief valves achieved by controlling the pressure in the low signal plumbed in parallel in the B port line can yield B port when the pump is set up for Control Type multiple, sequential pressure settings. (M). A manual, hydraulically piloted, electrical or electro-proportionally controlled pressure control Electrohydraulic Pressure & Flow Control device is installed in the line from the low signal B A proportional pressure control valve can be used in port to tank.

9 The pump will then maintain pressure place of relief valves to give Variable pressure control approximately equal to the pressure in the B port proportional to an electrical input signal to the valve. plus the pump differential setting. By combining this arrangement with a swash plate position sensing device, amplifier, and logic circuit, Low Pressure Standby servo control of pressure and/or flow is achieved. This option can be used as an alternative to the load NOTE: In most systems, a load equivalent to the sensing option (A) to achieve low pressure standby. minimum operating pressure of the pump cannot be Minimum standby pressure is somewhat higher than guaranteed. Because of this, a sequence valve is that achieved using option (A). In the compensating required in the discharge line to maintain servo flow mode there is approximately .3 GPM ( LPM) flow control.

10 Please refer to ordering information section from the low signal B port in addition to .9 GPM ( for servo components. LPM) flow from the control drain port A . Multiple Pressure Standby If the pressure level in the low signal B port is limited by a relief valve, as the desired pump outlet pressure is reached, the relief valve in the B port will allow the pump to standby at a preset pressure. Adding to this (AT CONSTANT SPEED). CONTROL OPTION - M'. FLOW. SWASHPLATE AIRBLEED VALVE. ASSEMBLY. PRESSURE. Piston OUTLET. INLET BARREL. D. Piston . SERVO Piston E CONTROL. SPOOL AND. SLEEVE. PORT B . F. CONTROL DRAIN CONTROL SPOOL. PORT A SPRING CHAMBER. PRESSURE DIFFERENTIAL. COMPENSATOR ADJUSTMENT. ADJUSTMENT. Parker Hannifin Corporation 5 hydraulic Pump/Motor Division Hydraulics Otsego, MI 49078. Variable volume Piston Pumps Control Options Series pavc 33/38/65/100.


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