Moveable valve seat cock valve auxiliary sealed with elastic

Abstract

This invention is an elasticity-sealed cock valve with movable valve seat. In the valve body, the valve seat is set at one end of the faucet that is vertical to the channel. The sealing face on one side of the seat contacts with the faucet. The shaft end stretching out from the lower part of the faucet is coupled with the inner orifice. The screw pair consists of the plug and the screw thread inside the valve body. The ends of the string contact with the valve seat and the plug respectively. The valve seat and the faucet can be made from metal or complex with seal pair consists of ceramic and plastic.

Description

technical field [0001] The invention belongs to a general mechanical product with a movable mechanism for controlling medium flow in a pipeline, and in particular relates to a movable valve seat cock valve with elastic auxiliary sealing. Background technique [0002] 1. Plug valve [0003] The invention of the cock as a switch valve has been recorded in the literature for more than 2,000 years, so the cock valve should be one of the oldest valves, and it is still one of the ten main types of fluid control valves. Its characteristics and working principle are: Generally, a plug with a taper acts as a valve core with a rectangular channel, and its taper cooperates with the taper of the valve body to form a sealing surface, and the opening and closing part (plug) is controlled by the handle around it. The axis rotates 90° to make the valve open or close. Although its fluid resistance is smaller than other valves, the switch is quick, convenient, and low in production cost, bu...

AI Technical Summary

Problems solved by technology

Although its fluid resistance is smaller than other valves, the switch is quick, convenient, and low in production cost, but due to structural reasons, this type of valve has two insurmountable defects for a long time: (1) because there is no valve seat in the valve body , In the cooperation between the valve body and the cock, the area other than the channel hole is the sealing surface, which needs careful processing and grinding for sealing. Due to the large contact area of ​​the sealing surface, the opening and closing torque also increases accordingly. Therefore it can only be used on low pressure lines

(2) Practice has proved that the matching materials of the sealing pair should be different, which makes it difficult for the valve to coordinate due to thermal expansion when the temperature changes. The above reasons sometimes cause the plug to be stuck in the valve body and cannot move. From time to time It will adversely affect the safe production and normal operation of the equipment

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