Eccentric semi-spherical valve base

Abstract

The invention relates to an eccentric semi-spherical valve base which comprises an inner valve base and an outer valve base, wherein the inner valve base and the outer valve base are of hollow step type rotating bodies, a rubber valve base is arranged between a concave spigot of the outer valve base and a convex spigot of the inner valve base, a hard sealing surface is arranged on the inner valve base, the inner valve base and the outer valve base are connected through axially arranged and uniformly distributed connecting bolts, and a gap is arranged between the inner valve base and the outer valve base. The inner valve base is coaxially connected with the outer valve base, so that more convenience and higher efficiency are achieved in processing; meanwhile by using a thread transmission boosting principle, no hydraulic machine is needed during installation, thus the assembly period is short and the efficiency is higher; and when the rubber valve base is worn, the worn rubber valve base can be compensated within a certain range.

Description

technical field [0001] The invention belongs to the technical field of eccentric hemispherical valves, in particular to an eccentric hemispherical valve seat. Background technique [0002] In the prior art, the inner and outer valve seats of the eccentric hemispherical valve with soft and hard seals are generally connected by hexagon socket head screws arranged radially along the valve seat and elastic washers. [0003] This structure has the following defects in processing and assembly: 1. Because the radial connection requires radial drilling and tapping of the inner valve seat and the outer valve seat, the processing is very inconvenient; The position accuracy of the hole is also difficult to guarantee; 3. In order to ensure that the screw hole can be accurately centered during assembly, a drill is generally used, which has low processing efficiency and the valve seat is not interchangeable, so it is not suitable for mass production; 4. Loaded with rubber After the valve...

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Problems solved by technology

[0003] This structure has the following defects in processing and assembly: 1. Because the radial connection requires radial drilling and tapping of the inner valve seat and the outer valve seat, the processing is very inconvenient; The position accuracy of the hole is also difficult to guarantee; 3. In order to ensure that the screw hole can be accurately centered during assembly, a drill is generally used, which has low processing efficiency and the valve seat is not interchangeable, so it is not suitable for mass production; 4. Loaded with rubber After the valve seat, first align the screw holes of the inner and outer valve seats, and then use a hydraulic press to press the inner valve seat into the outer valve seat until the convex seam of the inner valve seat fits with the concave seam of the outer valve seat; 5. The protruding amount of the rubber valve seat cannot be adjusted through assembly, but can only be adjusted through the matching ring groove, but it is difficult to accurately control the protruding amount; 6. The screw holes distributed on the outer cylindrical surface of the outer valve seat are not conducive to the valve seat The setting of the axial seal between the component and the valve seat hole is improved by increasing the axial dimension of the valve seat component, but due to the limitation of the valve structure length, the axial dimension space of the valve seat is limited; 7. Hard seal on the valve seat The sealing surface of the valve is set on the outer valve seat. When the sealing pair is assembled and adjusted, the alignment and contact of the sealing pair cannot be seen, which will artificially cause poor sealing or damage the sealing pair.

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