Pneumatic and hydraulic systems are generally divided into gas-liquid sources and processing systems, control components, and execution components. The various valves mentioned above belong to control components. As the name suggests, it means controlling various media or parameters in the gas-liquid system. It's not just about direction, flow rate, pressure, and so on, and these valves just play this role.

First of all, the directional control valve, as the name suggests, controls the direction of the fluid. The directional control valve and one-way valve you mentioned belong to the directional control valve. The directional valve is almost the most diverse and total type of pneumatic and pneumatic components, and is relatively the most concerned type of component. What people often hear about two in two, two in three, three in five, and so on are all directional control valves.

The overflow valve belongs to the pressure control valve, which means that when the pressure reaches or exceeds a certain set value, gas flows out from the overflow port, thereby protecting the pressure of the system.

Proportional valves and servo valves are classified from another dimension. For example, a flow proportional valve automatically and steplessly adjusts the flow rate of the valve, and the input current signal is proportional to the output gas flow rate. This is very different from traditional valves. Servo valves are used in servo control systems to improve the system's response speed. These two types of valves also include pressure control valves and flow control valves. Proportional and servo valves are much more expensive than traditional electromagnetic directional and pressure control valves, and are less commonly used in the automation industry.

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