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Pressure Center: Refers to the pressure applied at the solenoid valve’s inlet. Exhaust Center: Describes a state where fluid can be exhausted from one or more ports in the middle position. Closed Center: Describes a state where all ports are sealed, preventing fluid flow in the middle position.

In industries ranging from water treatment to oil and gas, the ability to precisely control fluid flow is critical for safety, efficiency, and cost management. Among the many control devices available, the manual valve remains a fundamental component due to its reliability, simplicity, and cost-effectiveness. Despite the rise of automation, manual valves continue to play an indispensable role in countless systems worldwide. This article explores their functions, types, benefits, and how to select the right one for your needs, helping you overcome common challenges such as leakage, inefficiency, and system failure.

​In today's automated industrial environment, the Solenoid Valve has become one of the most reliable and widely used fluid-control components. Its compact structure, rapid response, and compatibility with multiple media make it indispensable across pneumatic, hydraulic, and water-control applications. A solenoid-driven mechanism allows precise on/off switching, enabling stable performance even in demanding working environments. As a manufacturer such as ZHEJIANG OULEIKAI PNEUMATIC CO., LTD continues to optimize production technology, the stability and durability of Solenoid Valve products have been greatly enhanced.

When compressed air is used as an industrial power source or process gas, it inevitably contains a variety of harmful impurities, which mainly come from the atmosphere itself and the working process of the air compressor.