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

The A49H main safety valve is a high-performance full-opening safety valve that integrates large-displacement relief, cemented carbide sealing, and manual testing functions. The valve is equipped with a manual testing wrench, which supports regular forced opening tests on the valve disc to verify the reliability of its operating mechanism. It adopts a "Y"-shaped cemented carbide seal to ensure long-term tight sealing under high temperature, high pressure, and harsh media conditions. When the system is overpressured, the valve disc quickly opens fully to achieve rapid relief of large flow, and automatically closes after pressure recovery, providing reliable and verifiable overpressure protection for critical industrial systems. It is mainly used in key applications where strict requirements are placed on the sealing performance, discharge capacity, and reliability of safety valves, such as main steam systems of power station boilers, high-temperature and high-pressure reaction equipment in petrochemical industry, large pressure vessels, and industrial steam main pipelines. It is particularly suitable for industrial devices that require regular functional verification to ensure long-term safe standby. It is mainly used as the final pressure relief protection device for large power station boilers (especially supercritical and ultra-supercritical units), main steam systems of industrial boilers, secondary circuits of nuclear power plants, and large high-pressure devices in petrochemical industry. It is usually installed on the boiler superheater outlet header or main steam pipeline, and paired with pulse-type safety valves to form a core safety relief system.A49H Primary Safety Valve Product Diagram