Ceramic double-gate feed valve

Abstract

The invention discloses a ceramic double-gate feed valve. The ceramic double-gate feed valve comprises two side flanges made of metal, a middle valve body, a graphite gasket, an O-shaped ring, a valve rod, a stuffing box assembly, a stuffing gland, a ceramic valve seat, a ceramic ring, metal disc-shaped gates, a spring seat, supporting ejector rods, a stand column, a pneumatic actuator, an inner hexagonal bolt and a double-ended bolt and nut, wherein the metal disc-shaped gates and the ceramic ring jointly form the gates of the ceramic double-gate feed valve; the ceramic ring and the ceramic valve seat form a ceramic sealing pair; the pneumatic actuator pushes the valve rod and the spring seat, and drives the gates to move up and down, so that opening and closing action of the valve is completed; in the movement process of the gates, a spring enables the gates cling to the surface of the ceramic valve seat through the supporting ejector rods, so that stable and reliable sealing is guaranteed; and meanwhile, the gates generate autoroatation during linear motion due to the function of friction force, so that the ceramic double-gate feed valve has self-grinding performance and self-cleaning performance.

Description

technical field [0001] The invention belongs to the technical field of general mechanical valves, in particular to a ceramic double-gate feeding valve. Its structure is that the actuator pushes the valve stem to move up and down together with the gate plate through the spring seat to realize the switching action of the valve. The sealing surface of the gate plate is closely attached to the ceramic valve seat by the pressure of the spring, and the spring pressure always makes the gate plate tightly fit on the valve seat. Background technique [0002] The valve is a control component in the pipeline fluid conveying system, which is used to change the passage section and the flow direction of the medium, and has the functions of diversion, cut-off, throttling, check, diversion or overflow and pressure relief. Valves used for fluid control range from the simplest shut-off valve to various valves used in extremely complex automatic control systems. Valves for industrial pipelin...

AI Technical Summary

Problems solved by technology

[0003] Traditional metal gate valves have rectangular or knife-shaped gates. The valve seat is made of non-metallic materials, such as polytetrafluoroethylene and various rubbers. Switching action, the opening torque of the valve is large, and it is not suitable for granular media such as powder, granules, slag-water mixture, ore slurry, and the service life of the valve is low; metal-sealed gate valves are currently on the market, but the processing accuracy of the valve is high. , the medium is easy to enter between the gate and the sealing surface of the valve seat, causing wear and tear, the sealing of the valve is lost, and it is difficult to meet the needs of normal production and operation

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