Semi-ball valve capable of being overhauled without cutting off water and overhauling method

Abstract

The invention relates to the technical field of valve structures, in particular to a semi-ball valve capable of being overhauled without cutting off water and an overhauling method. Comprising a valve body, a water inlet and a water outlet are formed in the two ends of the valve body in the water flow direction, and an access hole is formed in the end perpendicular to the water flow direction; the hemisphere is rotatably hinged to the interior of the valve body through a driving shaft; the valve cover is fixed at the access hole through a bolt structure; the main valve seat is arranged at the water outlet, and when the hemisphere rotates to the water outlet, the main valve seat is in sealed connection with the hemisphere to close the valve; the overhaul valve seat is arranged at the overhaul opening, and an adjusting structure is arranged between the overhaul valve seat and the valve seat; and the adjusting structure is used for adjusting the position of the maintenance valve seat, so that the maintenance valve seat is hermetically connected with the valve cover during non-maintenance and is hermetically connected with the hemisphere overturned to the maintenance port during maintenance. The valve is simple in structure, the valve is extremely convenient to overhaul and operate, and the main sealing structure on the hemispheroid of the valve can be maintained and replaced under the condition that water is not cut off.

Description

technical field [0001] The invention relates to the technical field of valve structures, in particular to a hemispherical valve capable of maintenance without stopping water and a maintenance method. Background technique [0002] When the ball valve is working, the ball is rotated around the center line of the valve body to realize the opening and closing of the valve. Due to the advantages of small flow resistance, good sealing performance, flexible and light operation, eccentric hemispherical valves have been widely used in various industries. However, the traditional eccentric hemispherical valve has the following disadvantages: 1. The valve is closed by the contact between the ball and the valve seat. The ball rotates so that the opening of the ball faces the valve seat to realize the opening of the valve. During the switching process, the ball and the valve seat are worn. Larger, it is easy to cause sealing failure; 2. It is closed by the contact between the ball and t...

AI Technical Summary

Problems solved by technology

However, the traditional eccentric hemispherical valve has the following disadvantages: 1. The valve is closed by the contact between the ball and the valve seat. The ball rotates so that the opening of the ball faces the valve seat to realize the opening of the valve. During the switching process, the ball and the valve seat are worn. Larger, it is easy to cause sealing failure; 2. It is closed by the contact between the ball and the valve seat, the sealing performance is unreliable and the sealing performance is not good; 3. In the daily use process, if the valve needs to be repaired, it needs to be removed from the pipeline. Lower the valve, the operation process is complicated, the workload is heavy, and it is not easy to maintain; 4. The friction torque between the valve stem and the end face of the self-lubricating bearing is relatively large, and the alignment between the hemispherical valve core and the valve seat is difficult to adjust

However, the hemispherical valve only realizes the maintenance and replacement method without going offline. During the maintenance and replacement process, it is still necessary to stop the water in the pipeline, and then the subsequent maintenance and replacement work can be carried out.

In practical applications, it is found that some pipeline structures are quite special and require long-term supply. If the valve is damaged, it must be able to maintain without stopping water, but there is no such structure that can meet this requirement.

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