Cryogenic top entry type fireproof ball valve with composite heat dissipation disc valve cover

Abstract

Disclosed is a cryogenic top entry type fireproof ball valve with a composite heat dissipation disc valve cover. The cryogenic top entry type fireproof ball valve comprises a valve body. A ball core body is arranged in the middle of the valve body. The upper end of the valve body is connected with an upper valve rod. The upper section of the valve rod and graphite packing in a stuffing box on the upper portion of the valve cover stretch outwards in cooperation with each other. The upper rod is connected with an actuator assembly on a valve cover support. A composite heat dissipation disc structure composed of a single large-diameter heat dissipation disc and a neck multi-ring small-diameter heat dissipation disc is arranged outside the valve cover, and therefore the average temperature conductivity is improved, the convection heat dissipation area and temperature difference of the cold neck periphery and the surrounding environment are increased, an excellent heat dissipation effect is achieved, it is ensured that the sliding fit portion of the valve rod and the graphite packing is not frozen or bonded under the temperature above 0DEG C and opening and closing motion of the valve is reliable, hard frozen objects are prevented from scratching the valve rod and the packing, and the overall strength of the valve cover and the valve is improved. Due to the adoption of a multiple fire resistance and electrostatic grounding circuit structure, potential fire safety hazards caused by all kinds of factors can be avoided, and pipeline fires can be prevented from spreading.

Description

technical field [0001] The invention relates to a cryogenic ball valve, in particular to a cryogenic top-mounted fireproof ball valve with a composite temperature-dissipating disc valve cover. Background technique [0002] In the automatic control of the process of the modern liquefied natural gas, liquid oxygen, liquid hydrogen, liquid helium, etc. -150 ℃ to -250 ℃ cryogenic system process, the cryogenic top entry fireproof ball valve plays a very important role. In this process control, it is necessary to adjust and open and close the circulation parameters of the medium according to the real-time data signal. Sensitivity, reliability, sealing and life between valve stem and packing are crucial for control action. Because the lower section of the valve stem in the bonnet of the cryogenic top entry fireproof ball valve is connected with the ball core, and the upper section flexibly fits out with the graphite packing in the sealing box, and then connects with the actuator. ...

AI Technical Summary

Problems solved by technology

However, even if the sealing force is adjusted at the factory, it will be affected by most factors during the working conditions and may increase, so that the pressure in the cavity of the valve body may be in an ultra-high pressure state for a long time

In addition, the upstream and downstream discharge directions cannot be controlled when fully closed, which will cause leakage.

In addition, the setting of the fireproof sealing ring is not sufficient, and there are potential safety hazards

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