Eccentric Hemispherical Valve

Product Overview

The bidirectional sealing eccentric hemispherical valve utilizes an eccentric wedging principle in its structure, achieving tightening, regulation, and closing through a transmission mechanism. The sealing pair consists of a metal-to-metal hard-faced contact seal.  The double eccentric structure ensures that the valve core is located in the ball chamber during opening, resulting in a large flow cross-section and preventing erosion of the valve. During closing, the valve core is also protected from erosion.  During opening, the spherical surface of the valve core gradually approaches the valve seat, effectively cutting through scaling and achieving reliable sealing. The first characteristic is its particular effectiveness in handling two-phase mixed flows prone to scaling and solid precipitation; the second characteristic is that the valve's hemisphere uses bimetallic construction, with different alloys welded onto the base material, and the valve seat is also correspondingly welded and specially treated. The sealing surface combination offers various types of corrosion resistance, wear resistance, and high strength, meeting the needs of different applications; the third characteristic is its tight seal, achieving zero leakage when conveying hazardous gases; the fourth characteristic is that the valve core of the sealing pair has a compensation allowance. When the valve seat wears (the hardness of the valve seat is lower than that of the valve core), a slight rotation during closing still ensures reliable sealing, extending its service life. Furthermore, users can remove the tightening nut, adjust or replace the valve seat, thus avoiding the drawback of many existing valves where seal failure leads to complete valve scrapping. Therefore, the selection of bimetallic sealing pairs with different welded alloys (or composite balls) can be used in various industrial fields requiring wear resistance, corrosion resistance, high temperature resistance, and strict sealing.

Main Parts Material

Eccentric Hemispherical Valve (Full Bore)

Dimension Drawing

Technical Parameters

Fewer Unmixed Areas

The hemispherical dome is flush with the upper flange end face. The connecting flange can be designed separately according to customer requirements.

Eccentric Hemispherical Valve (Reduced Bore)

Dimension Drawing

Technical Parameters

Description:

The apex of the spherical dome is flush with the end face of the mounting flange. The connecting flange can be custom-designed according to customer requirements.

Expanding Seal Hemispherical Valve

Dimension Drawing

Technical Parameters

Fewer Unmixed Areas

The larger the size (th), the more the wide core A will extend beyond the mounting flange B, minimizing the dead zone between the spherical cap and the mixing blades. The connecting flange can be designed separately according to customer specifications.