Novel serially-connected blowdown valve

Abstract

The invention relates to a novel serially-connected blowdown valve. The blowndown valve comprises two blowndown valve single bodies. Each of blowndown valve single bodies comprises a valve body, an upper cover, a valve core assembly, a valve seat, a stuffing box, a support stand rod, a lead screw seat, a limit anti-rotating block and a hand wheel. The valve bodies are connected with the lower parts of the upper covers via bolts and screws so that fluid pressure bearing middle cavities are formed and then sealed by metal spiral wound gaskets. The upper parts of the upper covers are sealed by the stuffing box assemblies. The valve core assemblies are installed in the pressure bearing middle cavities. Each of the valve core assemblies comprises a sleeve, a valve core and a valve rod, wherein the sleeve is directly pressed on the valve seat and the upper end is fixed by the upper cover; and the valve core and the valve rod are integrated and capable of up-down sliding in the sleeve. The blowndown valve single bodies are serially connected together, so great differential pressure is equally divided on two blowndown valves. Thus, flow rate of the fluid is reduced, scouring force on inner pieces of the valve body by the fluid is effectively reduced and service lifetime of the blowndown valves is extended.

Description

technical field [0001] The patent of the present invention relates to a novel serial drain valve, which belongs to the technical field of industrial process control valves. Background technique [0002] In the field of process control technology, especially in the power and chemical industry, the discharge and recycling of boiler water are often not taken seriously. If it cannot be discharged or recycled regularly, it will cause a great waste of resources. The particles deposited in the steam drum And dirt can also cause steam drum clogging, affecting the heat exchange efficiency in the industrial production process. [0003] Usually, boiler water blowdown conditions are as follows: pressure registration ANSI 600, differential pressure 40-50 bar (g), temperature 285°C; pressure ANSI 1500, differential pressure 140-150 bar (g), temperature 485°C. In the huge working pressure difference, using a single valve, the erosion is very serious and the service life is short. [0004...

AI Technical Summary

Problems solved by technology

The working conditions of the industrial production process are harsh, the huge working pressure difference (especially ANSI 1500) and the high temperature working conditions cause the fluid flow rate to increase to form a two-phase flow, which seriously scours the internal parts, and the traditional blowdown valve is easily damaged, even Venturi The valve of the pipe design structure is also easily damaged

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