'prefill valve prevents'

Prefill valve is a drain valve which drains oil between the cylinder and tank. The prefill valve prevents the oil from flowing from the Hydraulic cylinder to the main tank while pressurizing inversely the hydraulic cylinder will make oil drain to the tank when reversion.

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A non-return valve allows a medium to flow in only one direction and is fitted to ensure that the medium flows through a pipe in the right direction, where pressure conditions may otherwise cause reversed flow.

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A needle valve is used to accurately control flow rates of clean fluids. The adjustments are gradual and smooth for controlling the flow rate.

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The purpose of a flow control valve is to regulate the flow rate in a specific portion of a hydraulic circuit. In hydraulic systems, they’re used to control the flow rate to motors and cylinders, thereby regulating the speed of those components.

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Unloading valves are used in hydraulic circuits, these valves would stop or remove the flow of the pump back to the tank when the machine is not operating. So by this reduction of heat and energy saving can be achieved because the prime mover load is reduce

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Counterbalance valves are used in hydraulic systems working with an overriding (run-away) or suspended load. They are designed to create back pressure at the return line of the actuator to prevent losing control over the load.

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sequence valves can be used to sense pressure (port 1) in one circuit and then open and supply oil to a secondary circuit (port 2) at a predetermined pressure. A typical application would be when maintained clamping pressure is required in the primary circuit while work is being performed in the secondary circuit.

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The purpose of pressure-reducing values is to keep the secondary pressures correct in branches of hydraulic systems. Most pressure-reducing valves are open and 2 way this allows the pressure to flow freely until they reach further downstream where there is a set pressure.

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Pressure relief valves are used in hydraulic systems to limit the system pressure to a specific set level. If this set level is reached, the pressure relief valve responds and feeds the excess flow from the system back to the tank. Note: the pressure relief valve is a normally closed pressure control valve

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