The gate of the big size cast steel gate valvee moves linearly with the valve stem, which is called the lift gate valve (also called the open gate valve). Usually, trapezoidal threads are provided on the lifting rod, and the rotary motion is changed into a linear motion by the nut at the top end of the valve and the guide groove on the valve body, that is, the operating torque is changed to the operating thrust. The sealing surface can be sealed only by the pressure of the medium, that is, the sealing surface of the ram is pressed against the valve seat on the other side by the pressure of the medium to ensure the sealing of the sealing surface, which is self-sealing. Most of the gate valves are forced to seal, that is, when the valve is closed, the external force is forced to press the gate to the valve seat to ensure the sealing of the sealing surface.
Based on the boundary conditions of the overall structure of the big size cast steel gate valve, the load is applied according to the actual working conditions and the test conditions, and the finite element static force analysis is performed on the stainless steel gate valve body. The equivalent stress of the stainless steel gate valve is mainly studied. According to the distribution situation, it is concluded that the stress concentration of the valve body of the large-diameter gate valve is obvious, and it cannot meet the requirements of use under the experimental pressure. Therefore, it is necessary to improve the shape of the cavity in the valve body to reduce the stress of the [big size cast steel gate valve manufacturer]. And make the stress distribution more uniform.
The big size cast steel gate valve includes a valve body, the valve body of the product is provided with a shutter, the valve body is installed at the top of the valve body, and the valve body and the valve cover are connected by a middle flange stud, and the middle flange stud Nuts are installed at both ends, and the valve stem of the product is connected to the valve plate inside the valve body through the valve cover. The top of the valve stem is equipped with a hand wheel, and a lock nut is arranged between the valve stem and the hand wheel. A stem nut is disposed between the rod and the top of the bonnet, and a packing gland is disposed on the bonnet of the product, and the bonnet and the packing gland are connected by a joint bolt, and the top of the bonnet of the product is provided with an oil cup. The stainless steel gate valve is made of a medium flange gasket and a packing gasket to enhance the sealing performance.