When full of water loss is zero, the flow channel is completely smooth road, and that the media is not deposited in the valve body cavity. 2, anti-wear particles: a shearing action between the spherical cap and metal seat V-shaped opening in the closure process, just before their eyes on the seat at the last minute not to form a spherical cap friction and wear seat with nickel alloy, can not easily be washed to wear, making it suitable for containing fibers, tiny solid particles, such as pulp. 3, suitable for high-velocity media: through way, a strong eccentric crank to make it suitable for high flow rates and no vibration. 4, long life: no wearing parts, the eccentric action, no friction between the sealing surface when the valves open and close, the long service life. 5, easy maintenance: When valve repair without the pipeline removed, simply open the valve cover to carry out repairs. 6, widely used in water, sewage, containing small solid particles, water, steam, gas, natural gas, oil and so on. ◆ Implementation of standards 1, design and manufacture: GB / T12237-1989 2, inspection and testing: GB / T13927-1992 3, flange connection: GB / T9113.1-2000 4, length of the structure: JD-2004 ◆ Main connection size and the weight of the body bonnet GB WCB ZG1Cr18Ni9Ti ZG0Cr18Ni12Mo2Ti ZG15Cr1Mo1V ASTM WCB CF8 CF8M WC9 sphere GB ZG2Cr13 ZG1Cr18Ni9Ti / special surface treatment ZG0Cr18Ni12Mo2Ti / special surface treatment ZG15Cr1Mo1V / special surface treatment ASTM CA15 CF8 + HF CF8M + HF WC9 + HF stem GB 2Cr13 1Cr18Ni9Ti 0Cr18Ni12Mo2Ti 25Cr2Mo2V ASTM 420 304 316 F22a seat GB PTFE 2Cr13 PTFE 1Cr18Ni9Ti PTFE 0Cr18Ni12Mo2Ti D517 ASTM PTFE 420 PTFE 304 PTFE 316 HF GB PTFE flexible graphite packing PTFE flexible graphite PTFE flexible graphite flexible graphite ASTM PTFE flexible graphite PTFE flexible graphite PTFE flexible graphite flexible graphite Bolt GB 35 0Cr18Ni9 0Cr18Ni9 15Cr1Mo1V ASTM A193 B7 A320-B8 A320-B8 A193 B16 nut GB 45 0Cr18Ni9 0Cr18Ni9 20CrMo ASTM A194 2H A194-8 A194-8