Product classification of Kaiweixi

KAI WEI XI CHAN PIN FEN LEI

Lift-type Safety Valve
Full-lift Safety Valve
Pilot-operated Safety Valve
Lever Safety Valve
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Fax：+86（577）6738 7099
Email：merry@kaiweixi.com
Address：No. 1, Linxia Road, Oubei Street, Yongjia County, Wenzhou City, Zhejiang Province,china
Website：https://www.kaiweixi.com

safety valve

A safety valve is an ultimate safety protection valve that does not require external force to actuate, but relies on the pressure of the medium itself to open automatically and closes automatically with the help of spring pressure. Its core function is to relieve excessive system pressure. When the pressure exceeds the set safety value, it automatically opens to discharge, and closes automatically after the pressure returns to normal, preventing equipment overpressure from causing explosion or damage. It is the "safety guardian" of industrial systems. From the structural principle, it is mainly divided into: spring type: using spring force to balance with medium pressure, which is the most widely used; lever type: loaded by lever and heavy hammer, used for fixed applications; pilot type: controlling the main valve action through a pilot valve, used for high-pressure and large-displacement conditions. Its core performance requirements are precise action, sufficient discharge capacity, reliable sealing, and accurate and timely resetting. The full-opening safety valve, micro-opening safety valve, spring safety valve, lever safety valve, pilot safety valve, API American standard safety valve, GOST Russian standard safety valve, and other safety valves produced by Kaiwei Xi Valve Group are key safety accessories legally required to be installed in all pressure-bearing systems such as boilers, pressure vessels, petrochemical plants, and long-distance pipelines.

Lift-type Safety Valve

Model：
A41H/A47H/A21F/A21H/A27W/A27H/A28X/A27Y/A28Y/A61Y/A62Y
Specification：
DN15~300mm
Pressure：
1.6~32Mpa
Material：
Cast Steel, Stainless Steel, Duplex Steel, Copper

The low-lift safety valve is an automatic valve designed to protect pressurized equipment. Its defining feature is the small opening height of the disc, typically ranging from 1/40 to 1/20 of the flow passage diameter. When the system pressure exceeds the preset safety value, the valve opens slightly, allowing a controlled release of medium through a limited opening area. Once the pressure returns to the normal operating range, the valve closes automatically. The low-lift safety valve has a relatively compact structure and mainly consists of components such as the valve body, disc, seat, and adjusting spring. The opening height is precisely controlled by internal mechanical structures (e.g., a reaction disk), and its operating characteristic is proportional action, meaning the opening height gradually increases with rising pressure. The low-lift safety valves produced by Kaiweixi Valve Group offer advantages such as lightweight design, excellent sealing, high sensitivity to pressure fluctuations, and prompt resetting. Due to their relatively small discharge capacity, they are particularly suitable for applications involving liquid media or where gas discharge requirements are limited. These valves serve as fundamental safety protection devices to prevent equipment damage or accidents caused by abnormal pressure increases.

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Full-lift Safety Valve

Model：
A42Y/A42F/AH42F/AHN42F/A48Y/A44Y/WA42Y/KA41Y/KA42Y
Specification：
DN15~600mm
Pressure：
1.6~32Mpa
Material：
Cast Steel, Stainless Steel, Duplex Steel, Copper

Full-Lift Safety Valve A full-lift safety valve is a high-performance pressure relief device. Its defining feature is the opening height of the disc, which can reach 1/4 or more of the flow passage diameter, thereby providing maximum discharge area and release capacity upon instantaneous opening, swiftly counteracting abnormal pressure increases in the system. The structure of a full-lift safety valve is generally more complex, with its full-lift functionality relying on key designs such as a reaction disk (or nozzle structure) and an adjusting ring. When pressure exceeds the set value, the medium acts on the reaction disk, generating significant lift force and causing the disc to rapidly reach the fully open position. Its actuation characteristic is two-stage (pop-action). The full-lift safety valves produced by Kaiweixi Valve Group offer outstanding advantages, including extremely high discharge efficiency, large release capacity, and rapid response. They effectively prevent catastrophic consequences caused by sudden pressure surges and serve as essential safety barriers in critical facilities such as power station boilers, high-pressure vessels, oil and gas storage tanks, long-distance pipelines, and large-scale petrochemical installations.

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Pilot-operated Safety Valve

Model：
A46F/A46Y/SDL500X
Specification：
DN15~600mm
Pressure：
1.6~32Mpa
Material：
Cast Steel, Stainless Steel, Duplex Steel, Copper

A pilot-operated safety valve is a high-performance, high-precision safety relief device that utilizes system media pressure to actuate the main valve. Its core working principle is as follows: A pilot valve (guide valve) senses system pressure. When the pressure exceeds the set value, the pilot valve actuates first, subsequently controlling and driving the main valve disc to open rapidly and fully, achieving high-flow discharge. The pilot-operated safety valve features a complex and precise structure, typically consisting of:Main valve (large-diameter valve body)，Pilot valve (small pressure-sensing controller)，Connecting pipelines，Control unit，Its operation is unaffected by backpressure, offering excellent sealing performance, highly accurate set pressure, and excellent repeatability. The pilot-operated safety valves produced by Kaiweixi Valve Group offer key advantages such as outstanding performance under large-diameter, high-pressure, and high-capacity conditions, along with zero leakage, high precision, and online pressure adjustment capabilities. The design allows the main valve to adopt a balanced configuration, making it insensitive to changes in system backpressure. These valves serve as top-tier safety protection devices in critical industrial sectors such as petrochemicals, natural gas storage and transportation, ultra-high-pressure power plants, liquefied natural gas facilities, and nuclear power plants.

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Lever Safety Valve

Model：
GA51H/GA42H/GA42Y/JA22H/JA42Y/AF4QH/GA44Y/GA44H/GA53H
Specification：
DN15~600mm
Pressure：
1.6~32Mpa
Material：
Cast Steel, Stainless Steel, Duplex Steel, Copper

Lever Safety Valve A lever safety valve is a traditional, direct-acting safety valve that utilizes the principle of a counterweight and lever to achieve pressure setting and operation. Its core feature lies in the precise adjustment of the counterweight's position or mass on the lever to set and maintain a constant opening pressure, without relying on a spring. This design offers intuitive structure and stable performance. The lever safety valve has a relatively simple structure, primarily consisting of the valve body, disc, seat, lever, pivot, and adjustable counterweight. When the force exerted by the system pressure on the underside of the disc exceeds the torque generated by the counterweight via the lever, the valve lifts to release pressure. Once the pressure decreases, the counterweight torque automatically resets and closes the valve. The lever safety valves produced by Kaiweixi Valve Group offer advantages such as robust construction, reliable performance, stable opening pressure unaffected by temperature, and intuitive maintenance and pressure setting. They are widely used in early industrial boilers, fixed low-pressure pressure vessels, and certain cost-sensitive applications with stable operating conditions.

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Product classification of Kaiweixi

KAI WEI XI CHAN PIN FEN LEI

Lift-type Safety Valve

Full-lift Safety Valve

Pilot-operated Safety Valve

Lever Safety Valve

More valve>>

safety valve

Lift-type Safety Valve

Full-lift Safety Valve

Pilot-operated Safety Valve

Lever Safety Valve