(1) the body structure has a straight-through ( Figure 2 - 40) , three general formula ( Figure 2 - 41) And the four general formula ( Figure 2 - 42) 。 (2) the cock body is opening and closing of cock. The cock body and stem into an organic whole. Cock body at the top of the processed into square head, using a wrench for opening and closing. Cock body and the valve sealing surface processed directly by the ontology, its dimension is commonly 1:6 or 1:7, sealing surface of high accuracy requirement. The cock body can use oil seal and metal seal. A nonmetallic may be used in low pressure seal liner structure, namely the body lined with ptfe. Three-pass cock valve plug channel into L or tee, there are three kinds of L channel distribution form, there are four T channel allocation form ( Figure 2 - 41) 。 Four-way cock Industrial Valves plug has two l-shaped channel, there are three kinds of distribution form ( Figure 2 - 42) 。 In order to ensure the sealing, must exert forces along the cock body axis direction, make the seal face close contact, forming a certain number of sealing pressure. According to the applied force in different ways, plug valves can be divided into the following several kinds of structure forms. 一个。 Tight pattern. Tighten locknut, the cock body small end the plug and the valve sealing surface close contact. The cock valve structure simple, generally is used in cases where no greater than PN6, as shown in FIG. 2 43. b。 Self sealing. By medium pressure make the plug and body sealing surface close contact. Medium by the plug holes in the body into the inversion of cock big head bottom cavity body, to resist the cock body and sealed. The medium pressure, the greater the sealing performance, the better, its spring pre-tightening role ( Figure 2 - 44) 。 It is suitable for high pressure, large diameter of cock. c。 Packing type. By tighten packing gland nut, packing pressure cock body and the valve sealing surface close contact, prevent leakage and leakage from the medium ( Figure 2 - 40) 。 d。 Oil seal type. Through the oil injection hole sealing grease injection in the valve, make the cock body with a very thin layer of oil film formed between the body and the role of lubrication and increase sealing ( Figure 2 - 45) 。 The open-close energy structure, reliable sealing performance, long service life, its temperature is determined by sealing grease performance, suitable for high pressure situations. e. Pressure balance type. Port for straight-through, cock inversion, the big small, hole in the cock with to cock big end and small end hole. To small end hole with check valve, closing, medium pressure equal to the size of end, because of the large end face is big, so the total force pushing cock up, make it easy to valve seal, at the moment on the leakage of the big end and small end don't have the check valve pressure relief, at this moment the small end total force is greater than the big end, push the cock down, lower the open torque, easy to open it. Body and bonnet, bolt connection is adopted, and adjusting pad, not only ensure the valve body, bonnet seal, seal between cock and body.

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