an overview of the valve, check valve, also known as reflux valve, non-return valve, back pressure valve, check valve. This type of valve is to rely on the force created by the flow of the medium itself in the line of open and close automatically, belongs to a kind of automatic valve. Scope of application of valve, check valve nominal pressure or pressure, PN1. 0 - 16. 150 - 0 mpa, ANSI类 900、JIS10- 20 k or nominal diameter diameter: DN15 ~ 900, NPS 1/4 ~ 36 connection mode: flange, butt welding, thread, socket and other applicable temperature: - Material: 196 ℃ ~ 540 ℃ body WCB, ZG1Cr18Ni9Ti, ZG1Cr18Ni12Mo2Ti, CF8, 304). 、CF3( 304L) 、CF8M( 316). 、CF3M( 316 l) 、Ti。 Choose different material, can be respectively suitable for water, steam, oil, nitric acid, acetic acid, oxidizing medium, urea, and other media.

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