Hard-sealing fast ball valve

Abstract

The invention belongs to the field of wind tunnel experiments and discloses a hard-sealing fast ball valve. The hard-sealing fast ball valve structurally comprises a valve body, a left valve deck, a right valve deck, a ball core, a left valve seat, a right valve seat, a valve rod, an upper supporting plate, a lower supporting plate, a left loading spring, a right loading spring, a left pressing ring, a right pressing ring, an upper sliding bearing, a lower sliding bearing, a valve rod sliding bearing and an upper sealing structure. Hardened layers are sprayed onto the ball core, the left valve seat and the right valve seat. The ball core, the valve rod and a valve seat base body are made of precipitation-hardening stainless steel. The integral upper sealing structure and a valve rod anti-blowing-out safety structure are adopted by the valve. According to the hard-sealing fast ball valve, the supporting plates and a fixed ball structure are adopted, and assembling errors are eliminated to the greatest extent; the ball core, the valve rod, a left valve seat base body and a right valve seat base body are made of the precipitation-hardening stainless steel, and meanwhile the hardened layers are sprayed onto the ball core, the left valve seat and the right valve seat so that high pressure difference and strong impact caused by large flow can be borne; the valve rod and the ball core are connected in a square mode, so that the load at the end of the valve rod is more uniform.

Description

technical field [0001] The invention belongs to the field of wind tunnel tests and relates to a ball valve device. Background technique [0002] When the temporary flushing hypersonic wind tunnel is running, due to the short running time, high airflow pressure, and frequent opening and closing of the wind tunnel, it is necessary to set an on-off valve on the air supply pipeline to quickly start and close the wind tunnel operation. The reference point of the wind tunnel pressure start control moment. The valve not only requires high sealing performance, fast opening and closing speed (generally within 2s), and the opening and closing action time cannot be significantly changed with factors such as the pressure difference between the front and rear of the valve. The operating conditions of the valve are harsh and the valve is reliable. Reproducibility and repeatability of long-running switches have become prominent issues. [0003] In the operation of hypersonic wind tunnels...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of large flow resistance of stop valve, limited caliber application and short service life of ordinary ball valves under the fast opening and closing conditions of temporary flushing hypersonic wind tunnel, the present invention proposes a hard-sealed fast ball valve, which meets the requirements of large flow rate, opening and closing. Hypersonic wind tunnel operating conditions with large closing pressure difference, rapid action, and frequent opening and closing require

Images