Bidirectional hard sealing rotary ball valve

Abstract

The invention discloses a two-way hard sealing rotary ball valve which comprises a valve body, a valve seat is arranged in the valve body, and a valve shaft capable of rotating around the axis of the valve shaft is arranged in the valve body in a penetrating mode; the valve plate is arranged on the valve shaft in a sleeving mode, and the valve shaft rotates to drive the valve plate to rotate synchronously; the valve plate is provided with a floating valve element, a floating ring and a limiting block, the floating valve element can be connected with the valve seat in a sealed mode to control the valve body to be closed, the floating ring can abut against the floating valve element to improve the sealing pressure of the floating valve element and the valve seat, and the limiting block is used for conducting sliding limiting on the floating ring. And the sealing structure is mounted on the valve body and used for sealing the joint of the valve shaft and the valve body. According to the two-way hard sealing rotary ball valve, the friction force of the sealing face can be effectively reduced, the opening and closing torque of the valve is reduced so as to prolong the service life of equipment, meanwhile, the valve structure is simplified, the valve body and a valve body of a conventional one-way butterfly valve can be commonly used, and the production, manufacturing and maintenance cost is reduced.

Description

technical field [0001] The invention relates to the technical field related to butterfly valves, in particular to a two-way hard-sealed rotary ball valve. Background technique [0002] The existing rotary ball valve adopts the technology of setting a floating valve seat on the valve body, so that when the valve shaft and the valve plate are elastically deformed after being subjected to reverse pressure, the floating valve seat will also be slightly displaced under the reverse medium pressure, maintaining contact and seal with the valve plate; however, in the case of forward flow, the valve shaft and the valve plate are also elastically deformed, but there is no displacement space for the floating valve seat in this direction, which will cause the contact pressure between the valve plate and the floating valve seat If it is too large, it will affect the life of the sealing pair and greatly increase the opening and closing torque of the valve. Contents of the invention [0...

AI Technical Summary

Problems solved by technology

[0002] The existing rotary ball valve adopts the technology of setting a floating valve seat on the valve body, so that when the valve shaft and the valve plate are elastically deformed after being subjected to reverse pressure, the floating valve seat will also be slightly displaced under the reverse medium pressure, maintaining contact and seal with the valve plate; however, in the case of forward flow, the valve shaft and the valve plate are also elastically deformed, but there is no displacement space for the floating valve seat in this direction, which will cause the contact pressure between the valve plate and the floating valve seat If it is too large, it will affect the life of the sealing pair and greatly increase the opening and closing torque of the valve

Images