{CLR.Field id="cone" fieldname="Title" /}_Botou Valve Manufacturing Industry Co., Ltd.

　　In the design of stainless steel gate valve, it is found that in addition to the strength of the valve body, the stiffness of the valve body should be considered in the design of the thickness of the valve body. That is to say, the deformation of the valve body cavity (under the action of 1.6 MPa medium pressure) should be controlled within the range of 0.001 DN, otherwise, the valve body will be unable to achieve sealing due to the deformation of the force.

　　The method to solve the stiffness of the valve body is shown in Fig. 1. The stiffeners are designed in the outer and inner chambers of the valve body, and the stiffeners are connected with the end flanges of the valve body to increase the stiffness of the valve body. When necessary, the stiffeners are designed to be unequal wall thickness, that is, to increase the wall thickness of the cavity part of the valve body in the approximate elliptical section. In design, the cover wall thickness S'B2 is usually no longer calculated and 0.95 of the body wall thickness is directly taken as the cover wall thickness.

　　DN1000 Cover Minimum Wall Thickness Data. In the BS5163 and BS5150 standards, the minimum diameter of the valve stem is also not given. When designing, the diameter of the valve stem must be calculated. The calculation formulas are as follows: K-stem design calculation coefficient in the formula, DN300-DN500, K 0.70-0.75; DN600-DNl00.0.60-0.65; the minimum wall thickness of the shell is not given in the pushing of BS5163 and BS5150 standards.

　　In the design, the wall thickness of the valve body must be calculated. In the design, the section shape of the valve body cavity is designed as an approximate ellipse. See Fig. 3. The design calculation of the wall thickness S'B1 is derived from the calculation formula of the ellipse wall thickness: the K-approximate ellipse wall thickness coefficient in the formula, where DN300-DN500, K 1.13, DN600-DNl000, K 1.07; P-medium pressure, design, P 1.6 MPa; a-approximate ellipse long axis (mm) of the section. 。