Special device for online opening and closing activation of large butterfly valve

Abstract

The invention discloses a special device for online opening and closing activation of a large butterfly valve. The special device comprises an activation shaft sleeve, a square-head indexing flange and an activation lever; a square hole is formed in the activation shaft sleeve; the square-head indexing flange is fixedly connected with a plane indexing flange through 12 screws; the 12 screws are equal in distance; a nut is movably hinged to one end of each screw; and a square head is arranged on one side, deviating from the plane indexing flange, of the square-head indexing flange. By the aid of the special device for online opening and closing activation of the large butterfly valve, online handling of the equipment failure of jamming of the large butterfly valve can be completed in the construction period of 3 hours, the distance between lifting rings and the top end of the activation lever is set to be longer than 5 mm, the device can be stressed by 1,000 kg or above, the device canbear the torque being 200 kn.m or above, the effects that the valve maintenance cost is reduced, a process system resumes production quickly and the running efficiency of the process system is improved substantially are achieved, and the problem of low bearing capacity of online activation machines for the large butterfly valves is solved.

Description

technical field [0001] The invention relates to the technical field of mechanical products, in particular to a special device for on-line switch activation of large butterfly valves. Background technique [0002] Metallurgy, chemical industry, electric power, mining, building materials and other industries need to transport a large amount of liquid and gas media, so large butterfly valves (DN800-DN3600) are widely used in many process systems, and most of the large valves are used on the main pipe of the process system. When the system is in normal operation, there are few actions and few opportunities for maintenance. Only when the system is out of service, the opening and closing operations and valve operation status inspection are performed. Since the conveyed medium generally contains a certain amount of impurities, fouling and jamming of the valve sleeve are easy to occur, and it is not easy to find. At the same time, if the large butterfly valve is overhauled or repla...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the torque is too small; the second is that due to the limited carrying capacity of tools such as pipe wrench, personal safety accidents are prone to occur

[0006] 4. The above three methods have two common shortcomings: 1. The torque of the power source for activating the valve is too small; 2. The tools used (executive agencies, pipe wrench, booster rods, etc.) cannot bear large moment loads

Therefore, it is difficult to achieve the purpose of on-line switching and revitalization of most valves

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