Switzerland Metal Seal Gate Valve

The valve body is usually made of cast steel (such as WCB), stainless steel (such as 304, 316) and other materials.

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Product Description

Working principle

Opening process: The stem is operated manually (rotating hand wheel) or by other driving methods (electric, pneumatic) to make it move upward. The stem drives the ram up and away from the seat, at which point the valve opens and the medium can flow smoothly through the valve channel. During this process, the seal is released due to the separation of the gate from the seat.

Closing process: Reverse the operation of the stem so that it moves downward. The gate is then lowered, and when the gate is in contact with the seat, pressure is applied to make the metal sealing surface of the gate and the seat fit tightly. Under high pressure conditions, the medium pressure will also assist to enhance the sealing effect, so as to cut off the flow channel of the medium and achieve sealing.

Performance characteristics

Excellent high temperature and high pressure resistance: metal sealed gate valves can withstand high pressure and temperature, for example, some high-quality metal sealed gate valves can withstand pressure up to PN420 (about 42MPa), and the working temperature can reach about 700 ° C. This makes it widely used in high temperature and high pressure industrial fields such as petrochemical industry and electric power.

High sealing reliability: metal-metal sealing structure can provide reliable sealing effect after proper grinding and processing. Especially in high pressure and high temperature environments, the stability of metal seals is better than that of elastic seals, which can effectively prevent medium leakage. This sealing performance is essential for piping systems that transport hazardous media such as toxic, harmful, flammable, explosive, etc.

Strong wear and corrosion resistance: the metal material of the valve body, gate and seat itself has good wear resistance and corrosion resistance. In addition, through surface treatment (such as surfacing cemented carbide) and reasonable material selection, it can further enhance its ability to resist media erosion and chemical corrosion. This allows the metal seal gate valve to adapt to a variety of harsh working conditions, such as slurry transportation containing solid particles, and the transportation of highly corrosive chemical media.

Long service life: Due to its strong structure, good wear and corrosion resistance, the metal seal gate valve has a relatively long service life. Under normal operation and maintenance conditions, it can work stably for many years, reducing the cost and downtime caused by frequent valve replacement.

Application field

Petrochemical industry: high-pressure pipelines used in the exploitation and transportation of crude oil and natural gas, as well as various high-temperature and high-pressure process pipelines in refineries and chemical plants. For example, in the pipeline system of high-temperature and high-pressure reaction equipment such as catalytic cracking units and hydrofining units, the flow of media is controlled and leakage is prevented.

Power industry: plays a role in steam pipelines and high-pressure water supply pipelines of thermal power stations. The medium temperature in these pipelines is high (such as the steam temperature can reach 500-600 ° C), the pressure is large (such as the main steam pressure can reach 16-25MPa), and the metal sealed gate valve can ensure the safe and stable operation of the system.

Metallurgical industry: used in high-pressure pipes such as blast furnace gas conveying pipes and oxygen conveying pipes in the process of iron and steel smelting. Because the medium in these pipes has the characteristics of high temperature, high pressure, inflammable and explosive, the reliable sealing performance of the metal seal gate valve can ensure production safety.

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