Category: Hydraulic Valve

Hydraulic Restrictor Valve

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Hydraulic Restrictor Valve

Hydraulic restrictor valve is used to reduce the fluid flow rate which decreased the actuator speed movement. There are two main type of restrictor, fixed type and variable restrictor. Variable restrictor is made from a modified needle valve; the valve is used to alter the operating time of a system or subsystem.

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Needle Valve and Variable Restrictor Valve

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Needle Valve and Variable Restrictor Valve

Needle valve has the same working principle with globe valve; the most obvious different is needle valve uses long tapered point at valve stem end instead of disk on globe valve. Needle valve is suitable to use as a throttle valve since it has smaller seating surface area. Needle valve can be used to protect …

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Hydraulic Pressure Regulator Valve

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Hydraulic Pressure Regulator Valve

Hydraulic pressure regulator is typically called unloading valve. There 2 main parameter on the unloading valve, there are opening pressure and closing pressure. For example, a pressure regulator is set to open if the pressure drops below 600 psi and close if the pressure above 800 psi then the valve operating pressure is 200 psi. …

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Pressure Controlled Sequence Valve

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Pressure Controlled Sequence Valve

The figure above illustrates a pressure controlled sequence valve working principle. The spring tension which holds the piston can be adjusted to obtain opening pressure. ┬áThe fluid will flow through the valve from inlet port to the primary outlet port. Inside the valve, the fluid pressure also work against the spring through the lower piston …

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Pilot Operated Valve

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Pilot Operated Valve

On large hydraulic valve the force needed to operate the valve also increases. If the force is too large for solenoid or manual operation, then we can use pilot operated valve. The working principle of pilot operated valve is shown in figure above. In the example the valve 1 is used to move a ram, …

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Pilot Operated Check Valve

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Pilot Operated Check Valve

According to the schematic above the cylinder should remain in its position when the control valve is in its center position or off position. But in practice the leakage in control valve will allow the cylinder to creep. Check valve would not have any leakage in closed position but we can’t use a simple check …

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Hydraulic Relief Valves

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Hydraulic Relief Valves

Hydraulic relief valves are one of pressure control valve type. Hydraulic relief valve has many functions such as giving overload protection or to limit the force/torque on hydraulic rotary actuator. Hydraulic relief valve consist of to two main sections: 1. Body section to contain a piston and spring to retain the piston on its seat. …

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