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Piston Pumps

    Piston pumps are a simple form of pump. They use a piston inside of a sealed chamber to move a liquid or gas from one place to another. The backward and forward motion of the piston changes the pressure in the pump cylinder, forcing fluid through the pump in one direction from the inlet port to the outlet port. The simplest form of piston pump is the bicycle tyre pump shown here.     The bicycle pump has all the parts that a piston pump needs to operate. It has two pairs of valves and two ports, a piston and a piston cylinder. Each port allows the flow of product through the pump while the valves ensure that it does not flow backwards. The piston causes the pressure changes that force fluid or gas into the piston cylinder and out through the outlet port.

How it works

    The piston for the pump is a small cylinder that reciprocates inside of the larger sealed cylinder. As the piston is moved up the cylinder, the intake port allows air to flow through the one-way valve and into the piston chamber. The one-way valve allows air into the piston chamber and prevents it from flowing back through the intake port. When the piston is moved down, it is on the output stroke, which forces air past the output valve and through the valve stem tap connected to your tyres’ tube. When the piston moves back up on the intake stroke, it pulls air into the piston chamber again, through the intake port and past the intake valve. Each stroke is part of a cycle that pulls air from outside and moves it into the tyres’ tube as the piston moves up and down.

Hydraulic piston pumps

        Hydraulic piston pumps work in exactly the same way. The cutaway drawing in Fig. 1 shows two of the individual piston and piston cylinder combinations that operate like the bicycle pump. The angle of the swash plate allows the piston to move in and out of the cylinders as the pump shaft rotates. In a variable displacement pump this angle can be controlled by hydraulic pressure acting on the controller piston, at the bottom. A port plate situated between the back cover plate and the pump body allows oil from the suction side to enter the cylinder when the piston is moving back and directs oil flow to the output pressure side when the piston is moving back into the cylinder Hydraulic piston pumps are capable of generating high pressure levels but are not well suited for moving large volumes of oil. Piston pumps with a high volume capacity are usually more expensive than other types of pump with a similar capacity because they need to have more pistons and cylinders packed into the body. The amount of oil that a piston pump can move with each stroke is determined by the diameter of the piston and the distance that it moves during its stroke. The rate that a piston pumps moves this oil depends on how quickly the piston completes its intake and output strokes and the viscosity of the material.

Applications

        Piston pumps are a relatively simple form of pump suitable for applications requiring small regulated amounts of pressurized gas or liquid. Piston pumps are often used in agriculture and landscaping since the rate of the pump's flow is regulated by the speed of the piston. Linking the speed of the piston to the drive system of your vehicle allows you to spread fertilizer and other chemicals at an even rate while moving at different speeds. Other applications for piston pumps in industry are where they are used for hydrostatic transmissions in open and closed loop circuits. By adjusting the position of the swash-plate it is possible to smoothly vary the output flow to an infinite amount between the maximum and minimum flow rate of the pump. The Parker PI pump shown here is a variable displacement, axial-piston pump intended for open circuit applications on mobile equipment. Designed for simplified service and high operating efficiency, PI pumps are rated for continuous service at the high drive speeds typical of mobile applications. For high operating system pressures of 400 bar with peak pressures of 450 bar, the Rexroth range of A4VG variable displacement axial piston pumps are designed for hydrostatic closed loop transmissions. Flow is proportional to drive speed and displacement, and is infinately variable. Output flow increases with swivel angle from 0 to its maximum value. Swivelling the pump over centre smoothly changes the direction of flow. A highly adaptable range of control and regulating devices is available. The pump is equipped with two pressure relief valves on the high pressure ports to protect the hydrostatic transmission (pump and motor) from overloads. Remember, at Central Qld Hydraulics, we take any old pumps and motors that are preserved well, replace their damaged parts to make them go on doing their outstanding work as new pumps and motors.

Hydraulic Piston Pumps

A10VO Variable_piston_pump
Fig. 1
VPump A4VG
Bent axis piston pumps
Bent axis pump 4 Bent axis pump 1 Bent axis pump 2 Bent axis pump 3 Straight axis pump 1 Straight axis pump 2 Straight axis pump 3
Straight axis piston pumps
Shaft seal
Drive shaft
Swash plate
Controller piston
Pump cylinder
Pump body
Piston slipper
Pump piston
Back cover plate
Port plate
headerline PHLogo Flare
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CENTRAL QUEENSLAND HYDRAULICS

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Home Products Filtration Service & Repairs Hire Distributorships Quality & Safety Profile Contact Us

Piston Pumps

    Piston pumps are a simple form of pump. They use a piston inside of a sealed chamber to move a liquid or gas from one place to another. The backward and forward motion of the piston changes the pressure in the pump cylinder, forcing fluid through the pump in one direction from the inlet port to the outlet port. The simplest form of piston pump is the bicycle tyre pump shown here.     The bicycle pump has all the parts that a piston pump needs to operate. It has two pairs of valves and two ports, a piston and a piston cylinder. Each port allows the flow of product through the pump while the valves ensure that it does not flow backwards. The piston causes the pressure changes that force fluid or gas into the piston cylinder and out through the outlet port.

How it works

    The piston for the pump is a small cylinder that reciprocates inside of the larger sealed cylinder. As the piston is moved up the cylinder, the intake port allows air to flow through the one-way valve and into the piston chamber. The one-way valve allows air into the piston chamber and prevents it from flowing back through the intake port. When the piston is moved down, it is on the output stroke, which forces air past the output valve and through the valve stem tap connected to your tyres’ tube. When the piston moves back up on the intake stroke, it pulls air into the piston chamber again, through the intake port and past the intake valve. Each stroke is part of a cycle that pulls air from outside and moves it into the tyres’ tube as the piston moves up and down.

Hydraulic piston pumps

        Hydraulic piston pumps work in exactly the same way. The cutaway drawing in Fig. 1 shows two of the individual piston and piston cylinder combinations that operate like the bicycle pump. The angle of the swash plate allows the piston to move in and out of the cylinders as the pump shaft rotates. In a variable displacement pump this angle can be controlled by hydraulic pressure acting on the controller piston, at the bottom. A port plate situated between the back cover plate and the pump body allows oil from the suction side to enter the cylinder when the piston is moving back and directs oil flow to the output pressure side when the piston is moving back into the cylinder Hydraulic piston pumps are capable of generating high pressure levels but are not well suited for moving large volumes of oil. Piston pumps with a high volume capacity are usually more expensive than other types of pump with a similar capacity because they need to have more pistons and cylinders packed into the body. The amount of oil that a piston pump can move with each stroke is determined by the diameter of the piston and the distance that it moves during its stroke. The rate that a piston pumps moves this oil depends on how quickly the piston completes its intake and output strokes and the viscosity of the material.

Applications

        Piston pumps are a relatively simple form of pump suitable for applications requiring small regulated amounts of pressurized gas or liquid. Piston pumps are often used in agriculture and landscaping since the rate of the pump's flow is regulated by the speed of the piston. Linking the speed of the piston to the drive system of your vehicle allows you to spread fertilizer and other chemicals at an even rate while moving at different speeds. Other applications for piston pumps in industry are where they are used for hydrostatic transmissions in open and closed loop circuits. By adjusting the position of the swash-plate it is possible to smoothly vary the output flow to an infinite amount between the maximum and minimum flow rate of the pump. The Parker PI pump shown here is a variable displacement, axial-piston pump intended for open circuit applications on mobile equipment. Designed for simplified service and high operating efficiency, PI pumps are rated for continuous service at the high drive speeds typical of mobile applications. For high operating system pressures of 400 bar with peak pressures of 450 bar, the Rexroth range of A4VG variable displacement axial piston pumps are designed for hydrostatic closed loop transmissions. Flow is proportional to drive speed and displacement, and is infinately variable. Output flow increases with swivel angle from 0 to its maximum value. Swivelling the pump over centre smoothly changes the direction of flow. A highly adaptable range of control and regulating devices is available. The pump is equipped with two pressure relief valves on the high pressure ports to protect the hydrostatic transmission (pump and motor) from overloads. Remember, at Central Qld Hydraulics, we take any old pumps and motors that are preserved well, replace their damaged parts to make them go on doing their outstanding work as new pumps and motors.

Hydraulic Piston Pumps

A10VO Variable_piston_pump
Fig. 1
VPump A4VG
Bent axis piston pumps
Bent axis pump 4 Bent axis pump 1 Bent axis pump 2 Bent axis pump 3 Straight axis pump 1 Straight axis pump 2 Straight axis pump 3
Straight axis piston pumps
Shaft seal
Drive shaft
Swash plate
Controller piston
Pump cylinder
Pump body
Piston slipper
Pump piston
Back cover plate
Port plate
headerline Flare
Copyright © 2013, Central Queensland Hydraulics Pty.Ltd. - Contact our Webmaster
Oil drop Checkout our Surplus Pump stock