The A46F pilot-operated safety valve is a high-precision, large-capacity safety valve that utilizes a pilot valve to control the action of the main valve. It consists of a pilot valve (pulse valve) and a main valve. System pressure is transmitted to the pilot valve through a pressure guiding pipe. When the pressure exceeds the set value, the pilot valve acts first, which in turn controls the main valve to quickly and smoothly fully open or fully close. The "F" in its name represents that the sealing surface is directly machined from the valve body material. This structure is particularly suitable for high-pressure, large-diameter applications or situations requiring high sealing performance, precise opening and closing, and remote control. It overcomes the disadvantages of traditional spring-loaded safety valves, which are bulky and difficult to adjust when dealing with large diameters. It is mainly used in key safety relief points in high-pressure, large-diameter applications with extremely high requirements for sealing and action accuracy, such as main steam systems in power station boilers, secondary circuits in nuclear power plants, large reactors and high-pressure storage tanks in petrochemical industries, long-distance oil and gas pipelines, large compressor units, and offshore platforms. It represents an advanced technical solution for precise pressure relief protection in high-pressure and large-flow applications.

A46F Pilot-Operated Safety Valve (POSV) Product Diagram

1. Pilot control, precise action. It senses and controls pressure through a small pilot valve, ensuring smooth opening and closing of the main valve without chatter. The pressure difference during opening and closing is minimal, and the sealing performance is excellent, making it suitable for systems sensitive to pressure fluctuations.

2. Large displacement, high pressure, and large diameter: The main valve adopts a full-bore structure, featuring a large discharge area and extremely strong discharge capacity. It is particularly suitable for pipelines with large diameters (above DN150) and high pressures (up to PN250 or higher), resolving the contradiction between large displacement and compact structure. 3. High sealing performance and remote control: Under normal working pressure, the main valve disc is subjected to the dual effects of system medium pressure and auxiliary loading force, resulting in strong sealing force and bubble-level sealing. It can be easily equipped with solenoid valves and other components to achieve remote online testing or emergency opening.

4. Compact structure and convenient maintenance (compared to large-diameter direct-acting valves) Compared to spring-loaded safety valves with the same displacement, the pilot-operated structure is compact and lightweight. The pilot valve can be removed for calibration or maintenance separately, without dismantling the main valve, making maintenance convenient.

5. Valve body sealing surface (Type "F") The main valve sealing surface is typically machined directly from the valve body material or formed through build-up welding, offering economic efficiency and durability. It is suitable for various media such as water, steam, and oil.

A46F Pilot-Operated Safety Valve (POSV) Structural Diagram

Part Name Material

Performance Specifications Table

A46F Pilot-Operated Safety Valve (POSV) Outline Drawing

Dimension Chart