Q340F-16C upper mounted eccentric hemispherical valve

Product Overview

The Q340F-16C upper mounted eccentric hemispherical valve fixes the metal ball crown on the eccentric ball, and opens and closes the valve through the 90 degree rotation of the eccentric crankshaft. The metal valve seat in contact with the sealing surface of the metal ball crown floats in the axial and radial directions to compensate for the fit between the ball crown and the valve seat. This valve is applied in industries such as petroleum, chemical, power, and metallurgy. The valve structure adopts the principle of eccentric wedge tightening, and achieves the purpose of locking, adjusting, and closing through a transmission mechanism. The sealing ring and ball crown are both metal surface ring hard surface contact seals. When the double eccentric structure valve is opened, the ball body is hidden in the valve chamber, with a large flow cross-section, and the valve is not washed away, resulting in low flow resistance. The valve core is not flushed when closed, and the spherical surface of the valve core is along when closed The seat is progressive and has a shearing function, effectively removing scaling obstacles and achieving reliable sealing. It is particularly effective for transporting media that are prone to scaling. This valve uses a hemispherical structure where a metal ball crown is fixed onto an eccentric sphere, and different alloy ball crowns are installed on the sphere. The valve seat is also welded with corresponding alloy, and after special treatment, the sealing surface is assembled into various types such as anti-corrosion, wear-resistant, and high-temperature resistant to meet the needs of different occasions. The valve seat and ball crown have a compensation amount. When the valve seat wears out, it can still be reliably sealed and extend its service life by rotating slightly when closing. The major feature of this valve is that it can be inspected and maintained online after the pressure relief of the working condition device system. During maintenance, only the valve cover needs to be opened to lift out the ball crown and support body, without having to remove the entire valve from the pipeline.

Unique Advantages

• Sealing pair (valve core, valve seat) – bimetallic, achieving metal spherical ring hard sealing, fire and explosion prevention;
• The upper eccentric hemispherical valve has a tight seal, and the sealing between the valve core and valve seat is a spherical line contact, achieving zero leakage through three-dimensional eccentricity;
• The valve core of the sealing pair has a compensation amount. When the valve is used for a long time and the sealing pair is worn, simply loosen the limit bolt on the handwheel side and turn it slightly when closing to achieve reliable sealing and extend the service life.
• The compression sleeve can be unscrewed, the valve seat can be adjusted or replaced, and the valve can still be used, avoiding the drawbacks of many valves being scrapped after sealing failure.