An electric high-temperature gate valve with a limit mechanism

Abstract

The invention discloses an electric high-temperature gate valve with a limiting mechanism, and belongs to the field of electric valves. The gate valve comprises an electric execution mechanism, a valve rod, a valve cover, a valve body, a valve seat ring, a valve plate and the limiting mechanism; the limiting mechanism comprises a limiting screw, a hubbed connecting flange and a hubbed condensate drainage flange; one end of the limiting screw abuts against the lower end of the valve plate located at the full-closed position, and the other end of the limiting screw is in threaded connection with the neck of the hubbed connecting flange; the neck of the hubbed condensate drainage flange is fixed to the end of the valve body, the neck of the hubbed connecting flange is installed inside a flange cavity of the hubbed condensate drainage flange in a sleeved mode, and a gap communicating with the external is formed between the neck of the hubbed connecting flange and the flange cavity of the hubbed condensate drainage flange and is used for draining condensate water in the valve body and preventing particulate matter from entering the valve body; and a blind flange of the hubbed connecting flange and a blind flange of the hubbed condensate drainage flange are in threaded connection through bolts, and a sealing gasket is arranged between the two blind flanges. According to the gate valve, the valve plate is prevented from being excessively closed, water and dirt can be discharged, and sediments in a valve cavity can be cleared conveniently.

Description

technical field [0001] The invention relates to the field of electric valves, in particular to an electric high-temperature gate valve with a limit mechanism. Background technique [0002] The electric high-temperature gate valve is a supporting control valve for the flue gas turbine in the catalytic cracking unit. It is usually installed on the inlet pipeline of the flue gas turbine, and the high-temperature flue gas containing catalyst particles is often used as a fluid medium, and is controlled by the electric high-temperature gate valve. Decide whether to pass. The opening and closing part of the electric high temperature gate valve is a valve plate, and the movement direction of the valve plate is perpendicular to the movement direction of the fluid medium. When the flue gas turbine is working normally, the valve plate is fully open. When the flue gas turbine needs to be shut down, the valve plate will automatically and quickly close to realize the self-protection chai...

AI Technical Summary

Problems solved by technology

[0005] During the closing process of the valve plate, it is easy to cause the wedging of the valve plate, or the thermal expansion of the valve plate after closing may also easily cause the wedging of the valve plate, resulting in the failure of the electric high-temperature gate valve to open, causing a greater safety hazard to the catalytic cracking unit

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