Top mounted eccentric hemisphere valve is a new product successfully developed by absorbing and digesting the advanced technologies at home and abroad. It fixes the metal ball crown on the eccentric ball, realizes the opening and closing of the valve through 90 ° rotation of the eccentric crankshaft, and the metal valve seat in contact with the sealing surface of the metal ball crown floats axially and radially to compensate the coordination between the ball crown and the valve seat. The valve is applied in petroleum, chemical industry, electric power and metallurgy industries. The valve structure adopts the eccentric wedge principle to achieve the purpose of locking, adjusting and closing through the transmission mechanism. The sealing ring and the ball crown are both metal faced and hard faced contact seals. When the valve with double eccentric structure is opened, the ball is hidden in the valve chamber, with large flow section, and the valve is not washed out, with small flow resistance. When closing, the valve core will not be washed. When closing, the spherical surface of the valve core will gradually move along the valve seat. It has the shear function, which can effectively remove the scaling obstacles and achieve reliable sealing. It is particularly effective for the transportation of media easy to scale. This valve hemisphere is used to fix the metal ball crown on the eccentric ball, and install different alloy ball crowns on the ball. The valve seat is also made of corresponding surfacing alloy. After special treatment, the sealing surface is composed of anti-corrosion, wear-resistant, high temperature resistant and other types to meet the needs of different occasions. The valve seat and ball crown are provided with compensation. When the valve seat is worn, it can still be reliably sealed and its service life can be extended by turning a little when it is closed. The greatest feature of this valve is that the valve can be inspected and maintained online after the pressure of the operating device system is relieved. During maintenance, it is only necessary to open the valve cover and lift out the ball crown and support body without having to remove the entire valve from the pipeline.

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.