The double eccentric hemisphere valve structure uses the eccentric wedge principle to achieve the purpose of locking, adjusting and closing through the transmission mechanism. The sealing pair is a metal surface ring with hard surface contact seal. When the double eccentric structure is opened, the valve core is located in the ball chamber, the flow section is large, and the valve is not washed: the valve core is not washed when it is closed, and the spherical surface of the valve core is asymptotic along the valve seat when it is opened, effectively removing the scaling obstacles, and achieving reliable sealing. It has special treatment for the corresponding surfacing of two-phase mixed flow, which is easy to deposit scaling solids. The sealing surface group is composed of anti-corrosion, wear-resistant, high-strength and other types to meet the needs of different occasions. The third feature is tight sealing, and the transmission of harmful gases can reach zero leakage; The fourth feature is that the core of the sealing pair has a compensation amount. When the valve seat is worn (the hardness of the valve seat is lower than that of the valve core), it can still be reliably sealed by turning it a little when it is closed, extending the service life. In addition, the user can unscrew the compression nut, and the valve seat can still be used after adjustment or replacement, avoiding the disadvantage of scrapping the entire set due to the sealing failure of many existing valves. Therefore, the choice of surfacing bimetal sealing pairs of different alloys (or composite balls) can be used in different industrial sectors that require strict sealing, such as wear resistance, corrosion resistance, high temperature resistance, etc.

Main purpose of the product

It is applicable to systems with strict requirements such as clean water, raw water (including silt), sewage, seawater, distilled water, oil, aluminum oxide, urban heating and heating.

The applicable temperature of soft seal eccentric hemisphere valve is - 40 ° C~200 ° C; The applicable temperature of hard seal eccentric hemisphere valve is from normal temperature to about 600°C.

It is applicable to the vent valve and control valve at the bottom of the dam (high flow rate state), pulverized coal ash and slag, and industrial pipeline transportation in liquid, solid two-phase mixed flow or chemical reaction with crystal precipitation or scaling in liquid transportation. The product structure characteristics are different according to the medium and temperature requirements required by customers. The ball crown is made of chromium molybdenum and vanadium alloy, and the valve seat is welded with chromium molybdenum alloy, chromium alloy and stainless steel alloy to meet the needs of different slurry transportation.

Applicable to valves of pump delivery system, such as pressurization system and central air-conditioning system.

It is applicable to underground pipelines such as water supply system, gas system and natural gas system.