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Types of Hydraulic and Pneumatic Actuator Valves

Source:http://www.flowxgroup.com/Update Time:2014-07-21Hits:

Hydraulic and pneumatic actuators valve manage the motion of fluid or air by mechanical systems. These valves, designed to rein and direct pressurized force, maintain power to equipment found in factories, industrial environments and in various types of large and small machinery.

Mechanically Operated Valves

Two kinds of valves are mainly used, that is, mechanical operating valves and manual operating valves. Manual operating valves are typically existed when a power source is not available. Where power supply is available, mechanically operated valves are more often used. Valves operated using mechanical device are also called actuators. Pneumatic and hydraulic valves both drop into the actuator or mechanically operated valve classification.


Hydraulic systems consist of five fundamental parts: hydraulic fluid, an oil reservoir and pressure lines, a pump to move oil and produce pressure as well as control valves to regulate flow. Pistons and cylinders then incur external mechanisms to power and keep mechanical equipment. Adopting oil to provide greater force at slower speeds with limited scope of motion, hydraulic systems are powered by a pump to produce pressurized force using hoses and valves to propel cylinders and initiate system activity.


Pneumatic actuators systems are alike to hydraulic systems in feature and design, with several crucial distinctions. Pneumatic systems use air to start force, so do not call for reservoirs to gather and store fluid between system uses. As air is also condensable, flow does not require to be controlled to sustain the system operating efficiently. Pneumatic electric actuators systems react quickly when powered and are often used for low-force events, as opposed to the more powerful but stiffer hydraulic systems.

Flow Control Valves

Control valves are applied in hydraulic and pneumatic actuator valve systems. Flow control valves come in various types and are used to regulate flow rate in systems. Needle valves tune and produce flow control by making a pressure fall across the valve opening. Pressure-compensated flow control valves perform as a flow control valve by keeping air or fluid flow during load pressure variations in the system. Proportional flow control valves hold air or fluid flow accordance with the present used to run the hydraulic or pneumatic actuator valve system.

Directional Control Valves

Directional control valves conduct fluid in hydraulic systems to keep pressurized force. There are five main kinds of directional control valves. Check valves control and restrict the flow of fluid in one direction. Spool valves use ports to transfer fluid to or from components in the system. Pilot-operated poppet valves move directional flow by using pressurized fluid applying force to a piston that moves the valve. Electro-hydraulic valves adopt solenoid plunger movement to move valve flow direction and rotary valves are designed to complete fluid flow in two directions.

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