stainless steel gate valve classification and main applicability
The opening and closing part of stainless steel gate valve is the gate, and the movement direction of the gate is perpendicular to the flow direction. In addition, the stainless steel gate valve can only play the role of full opening and closing, not as the function of regulating and throttling. Stainless steel gate valve with the valve stem to make a linear movement, called the lifting rod stainless steel gate valve. Generally, there will be trapezoidal thread on the lifting rod. Through the nut on the top of the valve and the guide groove on the valve body, the rotary motion will be changed into linear motion, that is, the operating torque will be changed into the operating thrust. The sealing surface of stainless steel gate valve can only rely on the medium pressure to seal, that is to press the sealing surface of the gate to the seat on the other side to ensure the sealing of the sealing surface, which is self sealing. Most stainless steel gate valves are forced to seal, that is, when the valve is closed, the gate must be forced to the valve seat by external force to ensure the sealing performance of the sealing surface.
There are many types of stainless steel gate valves, which can be divided into wedge gate type stainless steel gate valves and parallel gate stainless steel gate valves according to the sealing surface configuration. Wedge gate stainless steel gate valves can also be divided into single gate type, double gate plate type and elastic gate type; parallel gate valves can be divided into single gate type and double gate plate type. According to the thread position of the valve stem, it can be divided into two types: rising stem stainless steel gate valve and Non rising stem stainless steel gate valve.
No matter what kind of stainless steel gate valve, all meet the requirements of advanced standards at home and abroad, with reliable sealing, excellent performance and beautiful appearance. The material selection conforms to the relevant standards at home and abroad, and the overall quality of the materials is high. The sealing pairs are advanced and reasonable. The sealing surfaces of the gate and valve seat are made of Stellite cobalt based cemented carbide with different hardness. The sealing is reliable, with high hardness, high temperature resistance and long service life. After quenching and tempering and surface nitriding treatment, the valve rod has good wear resistance, corrosion resistance and scratch resistance. Wedge type elastic gate structure is adopted, thrust bearing is set in medium and large diameter, friction force is small, and impact manual is equipped, opening and closing are easy.
Stainless steel gate valve is especially suitable for high viscosity products, low Reynolds number, with suspended particles, for bubble medium measurement, according to the accuracy is not affected and limited by the electrical constant characteristics of the fluid medium. The structure design is special, has the diversion function, prevents the blocking situation, is the detailed information situation has the incomparable one kind of substitute function.
According to the flow coefficient and nonlinear error coefficient, the correction function of temperature change and density and change parameters is also provided. The measurement accuracy is about 0.5%. It can test the signal of the standard current displayed on site to achieve the coefficient of output and automatic control. The parameters can be automatically adjusted and set by computer networking.