High-temperature butterfly valve

Abstract

The invention discloses a high-temperature butterfly valve, which comprises a valve body. A valve rod and a valve plate are arranged in the valve body. The high-temperature butterfly valve is characterized in that one end of the valve rod is provided with a limit sleeve; one end of a bulb rod passes through a sealing cover and is in fit connection with a locking cover, while the other end of the bulb rod is arranged in the limit sleeve and a clearance A is reserved between the other end of the bulb rod and the end face of the valve rod; and a clearance B is reserved between the limit sleeve and the sealing cover. In the high-temperature butterfly valve, the thermal expansion clearances are reserved between the valve rod and the sealing cover and between the valve rod and the bulb rod, so the valve rod can normally extend in a high-temperature thermal expansion state, does not occupy a space position of a connected part thereof, and prevents the motion of the valve rod in the high-temperature thermal expansion state; the phenomenon of blockage and damage caused by deformation of the valve body and the valve rod under the thermal expansion is reduced and even eliminated to ensure the butterfly valve to work normally under a high-temperature working condition; and abrasion is reduced and the service life of the butterfly valve is effectively prolonged.

Description

technical field [0001] The invention relates to a butterfly valve, in particular to a high-temperature butterfly valve suitable for high-temperature working conditions. Background technique [0002] The sealing and positioning of the valve stem in the lower packing hole of the traditional butterfly valve are generally in the form of packing plus bearings. In the butterfly valve structure of the prior art shown in Figure 1, one end of the valve stem 13 is connected to the valve body 14, and the other end of the valve stem 13 is supported on the bearing 12, and the packing 9 and the bearing 12 are used for sealing and positioning; the bottom plate 11 is used as the end cover of the valve stem 13, and is connected with the valve body 14. The bearing 12 is positioned by the bearing retaining ring 10 to prevent it from moving; this positioning method has a good sealing effect, and while it is well sealed, the limit The effect is also very good. But above-mentioned butterfly val...

AI Technical Summary

Problems solved by technology

[0003] The present invention aims at the disadvantages of the prior art that the butterfly valve adopting packing and bearings to seal and position the valve stem cannot be used in high temperature occasions, and the valve is prone to jamming, etc., and provides a valve stem that can prevent the valve stem from thermally expanding at high temperature. Movement, reducing the phenomenon of jamming and damage caused by the deformation of the valve body and stem caused by thermal expansion, and a high-temperature butterfly valve with a long service life

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