Multiple Hydraulic Pump Circuits

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The multiple hydraulic pump types install two or more pumps in the same housing and use a single shaft to drive. Each pump has its own outlet although in some application one inlet is provided.

One pump driving two actuator
One pump driving two actuator

The pump shown in figure above drives the fluid to a hydraulic motor and cylinder actuator.

When the electric solenoid is activated, the fluid flows to the motor. If the three-position DCV is then shifted, flow is diverted to the cylinder. The motor and cylinder pressure determines how the flow will divide. If the motor pressure is much higher, then all the flow will go to the cylinder actuator and the hydraulic motor will stop running until the three-position DCV is in centre position or the cylinder reaches its maximum extension and the pressure is high enough for the motor circuit.

 

two pump driving two actuator
Two pump driving two actuator

If the motor operation is forbidden to be interrupted during cylinder operation, a multiple pump is good solution. The hydraulic system used the same component but we must use an open center three-position DCV. Relief valve is installed on each pump to protect the hydraulic circuit.

Gear pumps and vane pumps are available with more than two pumps in the same housing with one shaft. Two pumps in the same housing are commonly referred to as a tandem pump.

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