Wear-resisting small eccentric V-ball regulating valve special for salt chemical engineering

Abstract

The invention relates to a wear-resisting small eccentric V-ball regulating valve special for salt chemical engineering. The wear-resisting small eccentric V-ball regulating valve comprises a valve body, a packing box is machined on the valve body, a packing seal assembly, a packing gland and a packing pressing plate are sequentially arranged in the packing box and connected with the valve body in a fastening mode; a small eccentric valve ball is concentric with a transmission shaft and a driven shaft, the small eccentric valve ball is connected with the transmission shaft and the driven shaft and arranged in the valve body, an upper bush and the transmission shaft are arranged in the valve body from the top, a lower bush and the driven shaft are arranged in the valve body from the bottom, and a valve seat and a pressing ring are arranged in the valve body from the side face; a first distance adjustment pad and a second distance adjustment pad are arranged on the upper end face and the lower end face of the small eccentric valve ball; a first C-shaped seal ring is arranged in a clamping groove between the valve body and the first distance adjustment pad; a first supporting ring is arranged between the upper bush and the lower bush, and a second supporting ring is arranged between the first C-shaped seal ring and a second C-shaped seal ring. According to the wear-resisting small eccentric V-ball regulating valve, blocking of a flow channel of the valve body can be effectively prevented, corrosion of a cavity by crystals can be effectively prevented; the adjustment accuracy of the valve can be improved; scouring and corrosion of media on the valve body and components in the valve can be reduced; particle media can be prevented from entering valve shaft gaps, the adjustment accuracy of the valve can be greatly improved, and the service life of the valve can be greatly prolonged.

Description

technical field [0001] The invention relates to a special wear-resistant small eccentric V-ball regulating valve for salt chemical industry; it is a valve that can be widely used in harsh working conditions such as strong corrosion and easy crystallization in salinization equipment, and belongs to the field of instrument control. Background technique [0002] my country's salt chemical industry is developing rapidly, and the demand for valves used in various devices in the industry is increasing year by year, but the salt medium is easy to crystallize, and the particle hardness is high, reaching HRC30-36, so the valves used in this industry are prone to blockage of the valve body flow channel , cavity crystallization corrosion, unstable adjustment accuracy; or valve core stuck, valve shaft twisted and other phenomena. When the flow rate of the medium is greater than 2m / s, it will cause erosion to the valve body and valve internal parts; at the same time, particles are easy to...

AI Technical Summary

Problems solved by technology

[0002] my country's salt chemical industry is developing rapidly, and the demand for valves used in various devices in the industry is increasing year by year, but the salt medium is easy to crystallize, and the particle hardness is high, reaching HRC30-36, so the valves used in this industry are prone to blockage of the valve body flow channel , cavity crystallization corrosion, unstable adjustment accuracy; or valve core stuck, valve shaft twisted, etc.

When the flow rate of the medium is greater than 2m / s, it will cause erosion to the valve body and valve internal parts; at the same time, particles are easy to enter the gap between the valve shaft and the bushing, causing the valve shaft to be stuck, or increasing the switching torque of the valve body; The strong corrosiveness of caustic soda, hydrochloric acid and other media in the upper device leads to an extremely short service life of the valve. According to statistics, nearly 50% of the valves used in this industry need to replace the valve trim within 1-3 months, and nearly 80% of the valves are completely The service life of the valve does not exceed 6 months, which will not only affect the normal operation of the device, but may also cause safety hazards under extreme conditions

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