A hydraulic system is designed to lift heavy loads but requires fluid to flow in only one direction to prevent backflow. Which application most appropriately uses a non-return valve?
Inserting a non return valve in the pump discharge line to stop reverse fluid flow
A non-return (check) valve permits fluid to flow one way and seats shut against any flow in the reverse direction. Choosing where to fit it means finding the point in the circuit where reverse flow must be blocked.
In a hydraulic lift the pump delivers high-pressure fluid to raise and hold a heavy load through its actuator.
If the pump stops or slows, the loaded actuator pushes back and the fluid tends to flow in reverse toward the pump, letting the load sink and stressing the pump.
Placing the check valve in the pump discharge line lets delivery flow pass forward yet seals instantly against this backflow, holding the load up and protecting the pump.
Putting it in a control valve line would obstruct normal flow regulation, an inlet-line valve does not raise pressure, and a reservoir return line is meant to pass fluid back freely, so those placements do not answer the stated need.
The discharge line is exactly where one-way protection is required.
Hence, the answer is Inserting a non return valve in the pump discharge line to stop reverse fluid flow.
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