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A check valve, non-return valve or one-way valve is a mechanical device, a valve, which normally allows fluid (liquid or gas) to flow through it in only one direction. An important concept in check valves is the cracking pressure which is the minimum upstream pressure at which the valve will operate. Typically the check valve is designed for and can therefore be specified for a specific cracking pressure.
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API Cast Steel Swing Check Valve
Size: 2" ~ 24"
Pressure: ANSI Class 150 ~ Class 1500
Bolted cover, swing type disc, threaded or welded seat ring
Pressure Seal Bonnet Swing Check Valve

Size: 2" ~ 24"
Pressure: ANSI Class 600 ~ Class 2500
Pressure sealing cover, swing type disc, threaded or welded seat ring

 

Class 150~2500 Dual-plate Check Valve

Size: 2" ~ 56"
Pressure: ANSI Class 150 ~ Class 2500
Welco Valve can also produce the size up to 56" and the pressure will be higher than Class 600

Dual-Plate Check Valve
Size: 2"-48"
Face to face: API 594, API 6D
Pipe flange: ANSI  B16.5, API 605, ASME B16.47
Pressure- temperature rating: ANSI B 16.34
Type of connection: Wafer or flanged ends
Cast Iron Globe Type Check Valve
Size:  DN15-DN300
Flange dimensions: DIN2533
Face to face: DIN3202-F1
Flange Drilling:  DIN2532, DIN2533
 
Cast Iron Dual Plate Check Valve
Size: DN50-DN350
Flange drilling according to ANSI125/150; DIN2501PN10/PN16; AS2129 Table E;JIS10K etc.
Working Pressure: PN10; PN16; 150LB  
 
Cast Steel Single Check Valve
Size:  DN15-DN300
Working Pressure: PN10;PN16;150LB
Materials: WCB; CF8; CF8M; CF3M etc.
Flange drilling according to ANSI125/150; DIN2501PN10/PN16; AS2129 Table E; JIS10K ect.
JIS B2045 Swing Check Valve
Size :  2"-12"
Design Standard : JIS B2045
Face to Face : JIS B2002
Flange Dimension : JIS 2212
Test Standard : JIS B2003
 
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