Wear-resisting butterfly valve with manual emergency driving structure

Abstract

The invention discloses a wear-resisting butterfly valve with a manual emergency driving structure. The wear-resisting butterfly valve with the manual emergency driving structure comprises a butterfly valve body, a swing type driving mechanism, a power cylinder and the manual emergency driving structure. The swing type driving mechanism is arranged at the top end of the butterfly valve body; the power cylinder is connected to the right end of the swing type driving mechanism; the manual emergency mechanism comprises a hand wheel, a bush and a limit screw, wherein the hand wheel is coaxial with the piston rod of the power cylinder; the outer wall of the right end of the piston rod is provided with rectangular threads and threadedly connected with the hand wheel; the bush sleeves the rightwards-extending shaft sleeve of the hand wheel in clearance fit and is fixedly connected to the right end of a housing; the outer wall of the shaft sleeve of the hand wheel is provided with a radial ring groove; the limit screw radially penetrates the outer wall of the bush, and the end portion of the limit screw extends into the radial ring groove of the outer wall of the shaft sleeve of the hand wheel to compose a hand wheel axial limit structure; the sealed surface of the valve plate of the butterfly valve body is provided with a wear-resisting layer. The wear-resisting butterfly valve with the manual emergency driving structure is simple in structure, low in manufacturing cost and rapid and convenient to operate; the butterfly valve body can be fixed in a required opening position during manual emergency driving; the valve plate is good in wear resistance; the butterfly valve body is long in service life.

Description

technical field [0001] The invention relates to a hydraulically or pneumatically driven butterfly valve, in particular, the invention relates to a butterfly valve provided with a manual emergency mechanism. Background technique [0002] Hydraulic or pneumatically driven butterfly valves are widely used in ship pipe networks or some industrial pipe networks that require remote control due to their labor-saving and convenient operation. The existing hydraulic or pneumatically driven butterfly valves can be remotely controlled under normal conditions. To control the circulation or cut-off of the medium, but when the power is off, the working state of the valve cannot be changed because there is no power drive. At this time, if it is necessary to change the working state of the valve, the hydraulic or pneumatic drive device needs to be removed, and then the valve stem is manually turned to change the working state of the butterfly valve, but this process is time-consuming, troub...

AI Technical Summary

Problems solved by technology

[0002] Hydraulic or pneumatically driven butterfly valves are widely used in ship pipe networks or some industrial pipe networks that require remote control due to their labor-saving and convenient operation. The existing hydraulic or pneumatically driven butterfly valves can be remotely controlled under normal conditions. Control the circulation or cut-off of the medium, but in the event of a power failure, the working state of the valve cannot be changed due to no power drive

At this time, if it is necessary to change the working state of the valve, it is necessary to remove the hydraulic or pneumatic drive device, and then manually rotate the valve stem to change the working state of the butterfly valve, but this process is time-consuming, troublesome, and poor in timeliness

Chinese Patent Publication No. CN201582408U patent "Butterfly Valve Manual Emergency Drive Device" discloses a butterfly valve manual emergency drive device: the manual emergency drive is realized by a rack and pinion mechanism. This structure can realize the emergency drive of the butterfly valve, but its disadvantages are: The structure of the rack and pinion mechanism is complex, the manufacturing precision is high, and the manufacturing cost is high

Another kind of butterfly valve manual emergency drive device is disclosed in the patent "Butterfly Valve Emergency Manual Structure" of Chinese Patent Publication No. CN201582407U: the manual emergency drive is realized by the screw mechanism. This structure can realize the emergency drive of the butterfly valve, but its defect is that it needs manual Before the emergency drive, the screw shaft of the manual screw mechanism needs to be threadedly connected with the piston rod. When there is no need for manual emergency drive, the screw shaft of the screw mechanism needs to be disconnected from the piston rod manually. This operation is very complicated, time-consuming and troublesome, and it is easy to Mistake

In addition, in the technical solutions of these two patents, the butterfly valve cannot be opened and fixed at the required position when the manual emergency drive is performed.

On the other hand, the sealing surface of the butterfly valve plate in the prior art wears quickly, which directly affects the sealing performance and service life of the butterfly valve.

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