316 Stainless Steel Check Valve

Description

316 stainless steel check valve is also known as cf8m check valve, ss316 check valve, etc. The check valve is one of the indispensable products in the pipeline system. Its function is to prevent the backflow of the medium and prevent the reverse flow of the medium. It is a valve that opens and closes by itself through the flow of the medium itself.

The 316 stainless steel check valve has two body cover connection design forms: the first one is the body cover bolt connection 316 stainless steel check valve, the valve designed according to this connection form, the valve body and the valve cover are connected by bolts, and the winding gasket Sheet seal, the advantage is that it is easy to maintain; the second type of body cover is fully welded and sealed 316 stainless steel check valve, the valve designed according to this connection form, the valve body and the valve cover are connected by screw mosquitoes, all welded seal, the advantage is no leakage .

Check valve classification:

According to the structure, check valves can be divided into three types: lift check valves, swing check valves and butterfly check valves. Lift check valve can be divided into vertical and horizontal. The swing check valve is divided into three types: single-lobe type, double-lobe type and multi-lobe type. The butterfly check valve is a straight-through type. The above types of check valves can be divided into three types: threaded connection, flange connection and welding.

Check valve manufacturing range:

Nominal pressure or pressure level: PN1.0-16.0MPa, ANSI CLASS 150-900, JIS10-20K

Nominal diameter or diameter: DN15～900, NPS 1/4～36

Connection method: flange, butt welding, thread, socket welding, clip, etc.

Applicable temperature: -196℃～540℃

Body material: WCB, ZG1Cr18Ni9Ti, ZG1Cr18Ni12Mo2Ti, CF8(304), CF3(304L), CF8M(316), CF3M(316L), Ti. Choose different materials, check valve (aetv One-way valve): can be applied to water, steam, oil, nitric acid, acetic acid, oxidizing medium, urea and other media.

Limitations on the use of check valves

When the high temperature and high pressure condensate is discharged to a lower pressure area through the trap, a certain amount of flash steam will be generated. If the flash steam flows into the recovery line filled with low temperature condensate, the flash steam will transfer its latent heat to the condensate. The water thus condenses rapidly, creating water hammer. In this case, installing a check valve will not work.

The check valve prevents backflow and does not reduce back pressure. It does not allow condensate to drain from low pressure areas to high pressure lines. Even if the shut-off valve is installed after the trap, if the primary pressure is less than the secondary pressure, the condensate cannot be discharged.

In addition, it is also important to note that if a check valve is installed after a trap with a very small pressure difference, the check valve itself will also become a resistance point (ie the check valve also has a pressure loss), so the calculation of pressure drop requires pay attention.

The check valve is only a valve that guides the one-way flow of water, and is not an effective device to prevent backflow pollution. This concept is the principle of choosing a check valve or a pipeline backflow preventer. The pipeline backflow preventer has the function of a check valve, but the check valve does not have the function of the pipeline backflow preventer, so after the pipeline backflow preventer is installed, there is no need to set a return valve.

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