cock is with hole plug body as open-close part, through the rotation of the plug body and stem realize on-off movement. ball valve. Plug Industrial Valves has simple structure, rapid opening and closing, the fluid resistance is small. We plug valves used in the drilling problems made some improvement and strength calculation. Cock valve opening and closing is a perforated cylinder, perpendicular to the axis of rotation of the channel, so as to achieve the aim of opening and closing the channel. Plug valve is mainly be used for opening and closing medium pipeline and equipment. Cock valves main advantages are: apply to often operation, opening and closing fast, lightweight. Fluid resistance is small. Simple structure, relatively small volume, light weight, easy to maintenance. Sealed performance is not limited by the installation direction, the flow of medium can be arbitrary. No vibration, low noise. But plug valves are often used in the drilling turned off not easily open problems, this paper discussed a series of this issue and improve it. 1 under the effect of three kinds of given load, under the action of tensile load of the highest stress, minimum safety factor. Therefore, the strength condition under tensile load is the main contradiction. 2 stretching 40 crmnmo calculation of plug valve is commonly used materials, the safety coefficient is 1. 71 > 1. 5, can satisfy the strength requirement. Under tensile load knob orifice in the stress concentration is larger, the stress concentration at the material yield limit, according to a new strength criterion, the maximum stress concentration point 935. 75MPa
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