A forged steel two-way hard-seal floating ultra-low temperature ball valve

Abstract

The invention relates to a ball valve, and discloses a forged steel two-way hard-sealed floating ultra-low temperature ball valve, which includes a valve body, a ball inside the valve body, a valve rod connected to the ball body, and a flexible sealing graphite pad for pressing the valve seat against the ball inside the valve body. The side of the flexible sealing graphite pad far away from the ball is connected with a support seat, and a butterfly spring is arranged in the valve body to press the support seat. The contact part between the ball and the valve seat is provided with a threaded connection. The rotation direction of the ball is the same, and the ball moves away from the valve stem after rotation; the rotation of the valve stem can drive the ball, and the butterfly spring presses against the support seat in the valve body, and the support seat presses the valve seat through a flexible sealing graphite pad, and the valve seat The ball is sealed and threaded through the threaded connection. When the ball rotates, the threaded connection causes the ball to move on the valve seat, and the valve stem and the valve body are relatively fixed by the spring, so that the ball is connected to the valve seat through the threaded connection. more closely.

Description

technical field [0001] The invention relates to a ball valve, in particular to a forged steel two-way hard-seal floating ultra-low temperature ball valve. Background technique [0002] Valves suitable for medium temperatures below -150°C are called ultra-low temperature valves. Cryogenic valves include cryogenic ball valves, cryogenic gate valves, cryogenic globe valves, cryogenic safety valves, cryogenic check valves, etc., and are mainly used in chemical plants such as 300,000 tons of ethylene and liquefied natural gas. The output liquid low-temperature medium such as ethylene, liquid oxygen, liquid hydrogen, liquefied natural gas, liquefied petroleum products, etc. is not only flammable and explosive, but also needs to be gasified when the temperature rises, and the volume expands hundreds of times when gasified. [0003] For example, the patent announcement number is CN204755988U, which discloses an ultra-low temperature ball valve, which includes a valve cover, a valve...

AI Technical Summary

Problems solved by technology

[0004] The above existing technical solutions have the following defects: the ball in the ball valve will be sealed under the crimping of the valve seats on both sides of the ball, so as to avoid the leakage of the fluid in the valve body from the gap between the ball and the valve seat. The body is tightly installed on both sides of the ball. When the ball valve works for a period of time, due to corrosion or aging, there will be a gap at the part where the valve seat contacts the inner wall of the valve. performance drop

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