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Non Return Valves

Non Return Valves. Hydraulics – Module 3. Objectives. Identify the different types of non return valves and their symbols. Differentiate between the different non return valves. Explain the function of the shut off valve, check valve, and pilot check valve.

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Non Return Valves

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  1. Non Return Valves Hydraulics – Module 3

  2. Objectives • Identify the different types of non return valves and their symbols. • Differentiate between the different non return valves. • Explain the function of the shut off valve, check valve, and pilot check valve. • Draw the hydraulic circuit diagram. • Simulate the circuit diagram using FluidSim software. • Design and construct the task circuit practically and check its operation.

  3. Non – Return Valves • Non-return valves are used to block the flow in one direction and allow free flow in the other direction.

  4. Shut Off Valve • The shutoff valve is a manually opened or closed valve. • It has two ports (A) and (B)

  5. Check Valve • It used to allow the flow only in one direction; which means that the flow in the opposite direction will be completely blocked. • It has (2 ports A and B ) • The flow is allowed from (A) to (B) • The flow is blocked from (B) to (A)

  6. Pilot Check Valve • The function of the pilot check valve is to allow the flow only in one direction from port (A) to port (B), and also allows the flow in the opposite direction only when the port (x) has a pilot signal. • These valves have a pilot connection which can open the valve in the blocked direction, when a pilot signal is applied. • It has (3 ports A , B and X ) • (A): port for input pressure • (B): port for output pressure • (X): port for pilot pressure

  7. Practical Task 1: • Parts are fed through a drying oven on a steel chain conveyor belt. It must be possible to correct the tracking of the belt by means of a tensioning device to ensure that the belt does not run off its rollers. This device consists of a steel roller fixed at one end and movable at the other by means of a double-acting cylinder. Hydraulic power must be available continuously. • A piloted non-return valve is used to prevent creeping of the piston rod of the positioning cylinder as a result of oil leakage losses in the directional control valve

  8. Solution

  9. Practical Task 2: • Rolls of paper are lifted into a calendar by a lifting device. The lifting device is driven by a single acting cylinder. When the hydraulic power pack is switched on, the pump output flows directly to the cylinder. A shut off valve, which is closed in its normal position, is fitted in a branch line leading to the tank. A non return valve is used to ensure that the pump is protected against the oil back pressure. A pressure relief valve is fitted above the non return valve to safe the pump against excessive pressures. • Note:You can Use a double acting cylinder as a single acting cylinder by connecting return stroke port to the tank

  10. Solution:

  11. Let’s Solve the W.S. at the end of the Module ….

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