Gate valve plate Several forms of gate valve according to the structure of the gate is divided into two types of wedge and parallel. Wedge gate has three kinds of structure: Single gate structure (Figure 1) is relatively simple, but the wedge angle machining accuracy requirements are high, prone to clamping, abrasion phenomenon; double gate (Figure 2a) Wedge angle less demanding, the gate wedge is not easy to die, but the structure is more complex; elastic gate (Figure 2b) combines the advantages of single and double gate, to avoid their shortcomings, and thus more widely used. Its structural feature is the presence of an annular groove in the periphery of the gate, so that the gate has the appropriate flexibility. Parallel gate valve is usually double gate structure (Figure 2c); special purpose gate valve, such as long-distance oil transmission, gas pipeline with large-diameter gate valve for cleaning and the need for a single gate structure. How to distinguish between single-gate and dual-gate valve valve models can distinguish, such as: Z41Y-16, DN150 is a single gate flange valve, nominal diameter 150, the sealing surface material is carbide. The Z42-16, DN150 is a double gate valve, the other parameters are exactly the same. Judging from the appearance of crude judgment, double gate valve seal protruding part is greater than a single gate. How to distinguish single-gate and double-gate valve Single-gate valve is the most common, the price is lower, the technology is mature, reliable sealing Keywords: gate valve