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A hydraulic pump is an essential component of any hydraulic system. It is responsible for generating hydraulic pressure and moving fluid through the system to operate or manipulate hydraulic machinery. Fakat, pneumatic hydraulic pump also has limitations. The pulsating pump action can cause noise and vibration. Output pressure and flow rate tend to be lower than other pump types. And production costs are usually higher.

Understanding the key parts of a hydraulic pump and how they work together is important for maintenance and troubleshooting.

pneumatic hydraulic pump

The main parts of a hydraulic pump are:

  • ValvesThe valves in a hydraulic pump control the intake and discharge of hydraulic fluid. As they open and close, they control the movement of fluid into and out of the pump to maintain pressure.
  • CylindersCylinder bores house the pistons that create the pumping action. The cylinders contain hydraulic fluid and provide a sealed pathway for it to flow in and out.
  • PistonsPistons move up and down within the cylinders, pushing fluid out during the upstroke and drawing fluid in during the downstroke. Their action generates and maintains hydraulic pressure.
  • End platesThe end plates seal the ends of the cylinders and provide mounts for valves, pistons and connecting rods.
  • Connecting rodsThey attach the pistons to the drive mechanism (crankshaft) and provide the linkage between the two.
  • BearingsBearings allow rotating or sliding parts like the crankshaft and connecting rods to move with minimal friction. They help distribute loads and absorb shock.
  • CrankshaftThe crankshaft translates rotational motion into reciprocating piston motion. It is driven by an external power source and drives the connecting rods.
  • Pump casingThe pump casing forms the outer body and provides a reservoir for hydraulic fluid. It houses all the internal parts and has ports for fluid intake and discharge.

Pneumatic Hydraulic Pumps

Pneumatic or air operated hydraulic pumps are a simple but effective type of hydraulic pump. They use compressed air to power a diaphragm that moves hydraulic fluid through the pump.

The main parts of a pneumatic hydraulic pump are:

  • Air valveControls the flow of compressed air into the pump chambers.
  • DiaphragmA flexible membrane that moves when pressurized by air. It pushes and pulls hydraulic fluid through the pump.
  • Pump chambersTwo separate chambers divided by the diaphragm that cyclically fill and empty of hydraulic fluid.
  • Hydraulic portsConnections where hydraulic fluid is taken into and discharged from the pump chambers.
  • Air regulatorRegulates the amount of compressed air supplied to the pump chambers, controlling the hydraulic pressure output.

Pneumatic hydraulic pumps offer several advantages over conventional gear or vane pumps:

  • Simple design with few moving parts, resulting in high reliability.
  • Can be powered by shop air supplyno need for an electric motor.
  • Hydraulic pressure output is directly proportional to air pressure inputeasy to adjust.
  • Weight and size is relatively small.
  • Self primingwill automatically fill with hydraulic fluid.