Electric Control Valve The electric control valve is a core actuating component in industrial automation process control, designed to precisely regulate the flow, pressure, temperature, or level of pipeline media. Its core function lies in receiving standard control signals (e.g., 4–20 mA) from automation systems (such as DCS or PLC) and driving the valve opening to achieve continuous and accurate positioning, thereby enabling closed-loop control of process parameters. An electric control valve typically consists of two main components: the control valve body (including the valve plug, valve seat, bonnet, stem, etc.) and the electric actuator. The valve body features various structural designs, such as single-seat globe, double-seat globe, sleeve, and angle types, to meet different flow characteristics and differential pressure requirements. Electric control valves produced by Kaiweixi Valve Group offer core advantages such as high control precision, fast response speed, long-distance signal transmission, and seamless integration with digital communication systems. Their control characteristics (e.g., linear or equal percentage) can be tailored to specific process requirements to achieve optimal control performance. Electric control valves are widely used in applications demanding precise, stable, and remote automatic control, making them essential in process industries such as petroleum and chemical processing, power generation, pharmaceuticals, HVAC (heating, ventilation, and air conditioning), and fine chemical manufacturing.

Pneumatic Control Valve The pneumatic control valve is a core industrial process control instrument powered by compressed air. By receiving standard control signals, it continuously and precisely adjusts the valve opening to automate the control of key process parameters such as pipeline medium flow, pressure, temperature, or liquid level. A pneumatic control valve primarily consists of three main components:Control Valve Body;Pneumatic Actuator (typically diaphragm-type or piston-type)Valve Positioner (intelligent or mechanical) — a core accessory that precisely receives electrical or pneumatic signals and converts them into corresponding air pressure to accurately drive the valve stem positioning.The key advantages of pneumatic control valves include:Simple and reliable structure、Smooth and stable operation、Intrinsic safety and explosion-proof design、Easy maintenance、High output thrust，Their response speed meets the requirements of most industrial processes, offering irreplaceable advantages, especially in hazardous environments with flammable or explosive risks. Pneumatic control valves are widely used in process industries with high demands for safety and reliability, such as petroleum, chemical, natural gas, metallurgy, and power generation. They serve as critical terminal control components for achieving continuous production and automation.

A self-operated control valve is an automatic control valve that does not require an external power source (electricity or compressed air). Its core principle involves utilizing the pressure, temperature, or flow variations of the regulated medium as the driving energy. Through built-in sensing elements (such as diaphragms, bellows, or thermal bulbs), the valve plug is directly actuated to achieve autonomous regulation and control of process parameters. The self-operated control valve features a compact structure, primarily consisting of the valve body, valve plug, valve seat, and the key self-operated actuator. Based on functionality, it is mainly categorized into three types: self-operated pressure control valves, self-operated temperature control valves, and self-operated flow control valves. The main advantages of self-operated control valves produced by Kaiweixi Valve Group include their self-contained system, no need for external power or air supply, low operating costs, high safety and reliability, and simple installation. They are particularly suitable for applications where air or power supply is inconvenient, where explosion-proof requirements are stringent, or where only simple and stable control is required. Self-operated control valves are an ideal choice for natural gas distribution, small boiler heating systems, storage tank pressure control, heating systems, and industrial installations in remote areas. They provide a simple, economical, and reliable solution for automatically stabilizing pressure, temperature, and other parameters, as well as limiting flow.

Flow Control Valve Also known as a flow regulating control valve or flow and pressure regulating valve, the flow control valve is a specialized valve designed to achieve high-precision, wide-range flow regulation and stable pressure control under complex working conditions. Its core function is to overcome issues commonly associated with traditional valves during adjustment, such as cavitation, vibration, noise, and wear, ensuring smooth and accurate flow control even under high differential pressure conditions. The flow control valve employs a unique multi-stage pressure reduction or labyrinth flow path design (e.g., piston-type or multi-hole sleeve configuration). By decomposing a single high-pressure differential into multiple stages of low-pressure differentials, it effectively dissipates fluid energy and suppresses cavitation and flashing. The valve mainly consists of the valve body, a precision-adjustable piston or valve cage, a sealing system, and a drive mechanism. The flow control valves produced by Kaiweixi Valve Group are characterized by their wide regulating ratio, excellent linearity in flow control, outstanding anti-cavitation performance, smooth operation, and long service life. They not only regulate flow but also integrate multiple functions such as shut-off, pressure relief, and bypass. Flow control valves are widely used in applications with stringent flow control requirements, such as large-scale water supply networks, pump outlet protection, water distribution in wastewater treatment plants, cooling systems in power plants, and hydraulic engineering projects. They serve as critical equipment for ensuring system safety, energy efficiency, and stable operation.