OverviewThe A38Y spring duplex safety valve is a full-open safety valve with dual valve parallel redundancy design and cemented carbide seal. It integrates two independent spring full-open safety valves through a common valve body and is equipped with a switching mechanism. It can be seamlessly switched to the standby valve when the main valve is calibrated or maintained, providing uninterrupted overpressure protection for high temperature, high pressure and strongly corrosive conditions. It is specially used for the boiler main steam system of thermal power plant, petrochemical high-pressure reaction unit, auxiliary system of nuclear power plant and other occasions with extreme requirements on safety, tightness and emission capacity, as the key redundant safety protection equipment.A38Y Spring-Loaded Dual Safety Valves Product Diagram

The A40Y is a full-lift safety valve specifically designed for high-temperature media (such as superheated steam). Its core feature is the addition of a finned heat sink between the valve body and the spring chamber. This heat sink effectively reduces heat transfer from the high-temperature medium to the spring chamber, preventing the spring from weakening or failing due to high temperatures. This ensures the valve maintains precise and stable set pressure along with reliable opening/closing performance under high-temperature operating conditions, providing critical overpressure protection for high-temperature and high-pressure systems.A38Y Spring-Loaded Dual Safety Valves Product Diagram

The A42C spring-loaded full-opening safety valve is a type of safety valve that utilizes direct spring loading and a full-opening structure. The "C" in its designation indicates that the valve body material is carbon steel. When the system pressure exceeds the preset set pressure, the valve disc quickly rises to its fully open position, allowing for the rapid release of a large amount of medium; it automatically closes when the pressure returns to the specified value. This valve has a robust structure and strong versatility, serving as a standard safety relief device for providing high-capacity overpressure protection in various steam, gas, or liquid systems. It is widely used in industrial boilers, pressure vessels, compressed air systems, oil and gas storage tanks, heat exchangers, and general chemical equipment, serving as a standard high-capacity safety pressure relief device to protect systems from hazards caused by overpressure.A42C Spring-Operated Full-Lift Safety Valve Product Diagram

The A42H full-opening American Standard safety valve is a full-opening spring safety valve designed and manufactured in strict accordance with American standards (such as ASME Section I/VIII, API 526). The "H" in its name represents that the sealing surface is made of alloy steel. When the system experiences overpressure, the valve disc quickly opens fully to achieve high-flow discharge, and automatically closes after the pressure is restored. It fully meets the American Standard's specifications in terms of structure, dimensions, performance testing (such as pressure regulation and displacement certification), and materials, making it an ideal choice for export equipment or American Standard projects where there are mandatory compliance requirements for safety valves. It is mainly used in boilers, pressure vessels, petrochemical plants, liquefied natural gas (LNG) equipment, offshore platforms, and complete sets of equipment exported, designed or built according to American standards, as a mandatory overpressure protection device that meets regulatory requirements.A42H Full-Lift American Standard Safety Valve Product Diagram

A42Y Spring-Operated Full-Lift Safety Valve is a full-opening safety relief valve sealed with hard alloy. When the system pressure exceeds the preset set pressure, the valve disc quickly lifts to the fully open position, enabling rapid discharge of large flow rates; it automatically closes once the pressure returns to normal. Its "Y"-shaped hard alloy sealing surface possesses extremely high hardness, wear resistance, high temperature resistance, and corrosion resistance, providing reliable overpressure protection specifically for steam, gas, and corrosive medium systems with harsh operating conditions and high durability requirements for the sealing surface. It is primarily installed on power station boiler superheaters, main steam systems, petrochemical high-pressure/high-temperature reactors, synthetic ammonia plants, methanol plants, and various industrial boilers under harsh operating conditions. As a key safety device to prevent system overpressure, it is especially suitable for applications where the medium is high-temperature, corrosive, or has strong erosive properties.A42Y Spring-Operated Full-Lift Safety Valve Product Diagram

The A43Y spring-loaded full-opening dual safety valve is a hard alloy-sealed full-opening safety valve designed with a dual-valve parallel redundancy configuration. It integrates two independent spring-loaded full-opening safety valves into a shared valve body or manifold, and is equipped with a switching mechanism. When the primary safety valve requires offline calibration, maintenance, or malfunctions, the standby safety valve can be activated through switching operations, ensuring uninterrupted overpressure protection for the protected system. It is specifically designed for demanding industrial processes that require absolute continuous safety protection without any interruptions. It is dedicated to critical industrial devices where safety protection must not be interrupted, such as the main steam system of large thermal power plants, auxiliary systems of nuclear power plants, core reactors and hydrogenation units in petrochemical industries, continuous production lines for synthetic ammonia/ethylene, and process systems on offshore oil platforms. It is the ultimate solution for situations where standby safety valves are mandated by laws and regulations or process requirements.A43Y Spring-Operated Full-Lift Duplex Safety Valve Product Diagram

A44Y with wrench spring fully open closed safety valve is a high-performance safety valve that integrates manual testing, fully open discharge, hard alloy sealing, and closed structure. The valve is equipped with a manual testing wrench, which can be used for regular functional testing; Adopting a fully open design to achieve high flow discharge; The "Y" type hard alloy seal ensures tightness under high temperature and high pressure; Its enclosed structure can guide the discharged medium to a safe area (such as a discharge pipeline) through the outlet flange, avoiding the risk of on-site spraying, especially suitable for situations where toxic, harmful, flammable or high-temperature media are discharged. Mainly used in situations where it is necessary to safely recover or direct the released medium to the treatment system, such as reactors and storage tanks in petrochemical plants for the treatment of toxic and harmful gases (such as H2S and chlorine); Hydrogenation and cracking units in refineries; Process systems in the coal chemical and pharmaceutical industries. It is a key pressure relief equipment that ensures the safe and environmentally friendly operation of high-risk process flows.A44Y Manual Reset Lever Spring Full-Lift Closed Discharge Safety Valve Product Diagram

The A48Y spring-loaded full-opening safety valve with wrench is a spring-loaded full-opening safety valve equipped with a manual test wrench and utilizing a hard alloy seal. When the system pressure exceeds the set value, the valve disc quickly opens fully to achieve high-flow discharge; it automatically closes after the pressure recovers. The manual wrench is used to periodically forcefully open the valve disc for functional testing to verify its operational flexibility. The "Y"-shaped hard alloy seal ensures tightness under high temperature and high pressure, making it a high-performance safety valve that combines large discharge capacity, high sealing level, and the ability to actively verify reliability.A48Y Manual Lever Spring-Loaded Full-Lift Safety Valve Product Diagram

The A48H spring safety valve is a high-performance full-opening safety valve that integrates large-capacity discharge, carbide sealing, and manual testing functions. The valve is equipped with a manual testing wrench, allowing for regular forced opening tests on the valve disc to verify the reliability of its operating mechanism. It adopts a "Y"-shaped carbide seal to ensure long-term tight sealing under high temperature, high pressure, and harsh media conditions. When the system experiences overpressure, the valve disc quickly opens fully to achieve rapid discharge 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, discharge capacity, and reliability of safety valves, such as power station boiler main steam systems, petrochemical high-temperature and high-pressure reaction equipment, 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.A48H Spring-Loaded Safety Valve Product Diagram

The A61Y welded high-pressure safety valve is a specialized safety valve designed for high pressure applications, utilizing welded connections and hard alloy sealing. Both its inlet and outlet ends are pre-fabricated with welding grooves, allowing for direct butt welding with high-pressure pipelines, forming a permanent, high-strength, and zero-leakage connection. The valve features a "Y"-shaped hard alloy sealing surface, which exhibits extremely high hardness, wear resistance, and high temperature resistance. When the system pressure exceeds the preset set pressure, the valve automatically opens to release pressure; it closes automatically once the pressure is restored. This design provides reliable and compact overpressure protection specifically for harsh operating conditions characterized by high temperature, high pressure, severe vibration, or extreme requirements for connection sealing, such as main steam pipelines and hydrogenation reaction systems. It is primarily welded and installed in main steam pipelines, superheater outlets, and high-pressure water supply systems of ultra (ultra-) critical power station boilers; hydrogenation reactors and high-pressure heat exchanger outlet pipelines in the petrochemical industry; high-pressure process pipelines in synthetic ammonia and methanol plants; and key high-pressure relief points in the primary circuit auxiliary systems of nuclear power stations, where connection integrity, sealing performance, and pressure-bearing capacity are of utmost importance.A61Y Welded High Pressure Safety Valve Product Diagram

The AH42F safety reflux valve is a composite valve that integrates safety relief and medium reflux functions. It is typically installed at the outlet of a pump or on pipelines requiring pressure protection. When the pipeline pressure exceeds the set safety value, the valve opens as a safety valve to relieve pressure. When the pump suddenly stops or the downstream pressure is higher than the upstream pressure, the valve can act as a check valve to allow limited reflux of the medium, preventing water hammer, system backflow, and pump reversal. The "F" in the valve model indicates that the valve seat sealing surface is directly machined from the valve body material. This valve simplifies pipeline design and provides integrated safety protection and hydraulic control for pumps and pressure systems. It is mainly installed in the outlet pipelines of centrifugal pumps, water supply systems, fire pump sets, irrigation systems, and industrial circulating water systems. It is used to prevent system overpressure, avoid the hazards of water hammer during pump shutdown, and prevent damage to the pump caused by medium backflow. It is a commonly used multifunctional protection valve in pump pipelines.AH42F Safety Relief / Reflux Valve Product Diagram

KA42Y full opening sulfur resistant safety valve is a special safety valve designed for highly corrosive acidic media such as hydrogen sulfide (H ₂ S), with a full opening and hard alloy seal. Valves strictly comply with NACE MR0175/ISO 15156 standards, and all pressure bearing and contact medium components are made of sulfur resistant materials and treated with special processes to resist sulfide stress corrosion cracking (SSCC) and hydrogen induced cracking (HIC). When the system pressure exceeds the set safe value, the valve disc quickly opens to achieve rapid release of large flow; Automatically shut down after pressure recovery. Its "Y" type hard alloy seal ensures tightness and durability in harsh acidic environments, making it a key overpressure protection equipment for handling acidic media in high-risk industries such as oil and gas fields and refining. It is mainly installed in high sulfur natural gas wellhead equipment, intake separators and desulfurization towers in natural gas purification plants, hydrogenation reactors in refineries, acid oil and gas transmission pipelines, and coal chemical transformation and ventilation systems, which are critical safety release points with high-pressure and high flow acidic media. It serves as a core protective device to prevent system overpressure, ensure personnel safety and the environment.KA41H Low-Lift (Micro-Lift) Sulfur-Resistant Safety Valve Product Diagram

KA42Y full opening sulfur resistant safety valve is a special safety valve designed for highly corrosive acidic media such as hydrogen sulfide (H ₂ S), with a full opening and hard alloy seal. Valves strictly comply with NACE MR0175/ISO 15156 standards, and all pressure bearing and contact medium components are made of sulfur resistant materials and treated with special processes to resist sulfide stress corrosion cracking (SSCC) and hydrogen induced cracking (HIC). When the system pressure exceeds the set safe value, the valve disc quickly opens to achieve rapid release of large flow; Automatically shut down after pressure recovery. Its "Y" type hard alloy seal ensures tightness and durability in harsh acidic environments, making it a key overpressure protection equipment for handling acidic media in high-risk industries such as oil and gas fields and refining. It is mainly installed in high sulfur natural gas wellhead equipment, intake separators and desulfurization towers in natural gas purification plants, hydrogenation reactors in refineries, acid oil and gas transmission pipelines, and coal chemical transformation and ventilation systems, which are critical safety release points with high-pressure and high flow acidic media. It serves as a core protective device to prevent system overpressure, ensure personnel safety and the environment.WA42Y Bellows Balanced Safety Valve Product Diagram

The A48SH power plant high-temperature and high-pressure safety valve with radiator is a spring fully open safety valve designed specifically for power plant boilers and high-temperature and high-pressure steam systems. It effectively isolates the heat conduction of high-temperature media to the spring chamber through a built-in finned radiator, preventing the spring from relaxing and failing due to overheating. When the system pressure exceeds the set value, the valve disc quickly opens to achieve high flow and rapid release; Automatically shut down after pressure recovery. This valve provides three material grades based on working temperature: C-type (≤ 425 ℃), I-type (≤ 510 ℃), and V-type (≤ 550 ℃). It serves as a key overpressure protection device to ensure the safe operation of power plant boilers and high-temperature and high-pressure pipeline systems. Superheaters, reheaters, main steam pipelines, steam drums, industrial boilers, waste heat boilers, and high-temperature and high-pressure steam systems used specifically for boilers in thermal power plants serve as the last protective device against system overpressure, ensuring the long-term safe and stable operation of power plants and high-temperature and high-pressure systems.A48SH Power Plant High Temperature High Pressure Safety Valve with Heat Sink Product Diagram

AHN42F parallel safety reflux valve is a special valve that integrates safety relief and check functions, designed specifically for pump outlet pipelines and pressure systems that require prevention of medium backflow. It adopts a parallel valve disc structure, and the valve disc moves parallel to the fluid channel inside the valve body, with smooth opening and closing. When the system pressure exceeds the set safe value, the valve opens as a safety valve to release pressure; When the pump stops or the downstream pressure is higher than the upstream, the valve acts as a check valve and automatically closes to prevent the medium from flowing back. The sealing surface is directly processed from the valve body material ("F" type), which is economical and durable. This valve is dual-use, simplifying pipeline design and providing integrated safety protection and hydraulic control for pumps and pressure systems. Mainly installed in the outlet pipeline of centrifugal pumps, water supply systems, fire pump sets, industrial circulating water systems, petrochemical plants, and boiler feedwater systems. Used to prevent system overpressure, avoid backflow and water hammer hazards during pump shutdown, and prevent medium backflow from causing damage to the pump, it is a commonly used multifunctional protective valve in pump pipelines. AHN42F Parallel Type Safety Check Valve Product Diagram