The question I have is... do all check valves use springs? What other small economical options are there to use a checkvalve design without springs?

I am designing a sewage force main which is about 5 km length and 500mm diameter. The maximum flow is 440 l/s (raw sewage) for an operating pumping head of 60m.

I have three outdoor above ground bulk storage tanks for No. 2 diesel fuel. Each has a pump discharging into a common supply line. A check valve at each pump prevents backflow if one of the pumps fai

I would like to draw your attention on the EN 1779 standard (dated August 1999, as far as I know) about Non-destructive testing - Leak testing - Criteria for method and technique selection.

I have a question. Someone knows why suppliers offer dual plate check valves with solid stellite in the plates' material instead of stellited overlay.

I have heard that for every 900 litres of liquid volume in a line, a thermal relief valve needs to be installed.Is there any standard which will indicate when to put the thermal relief valve on the li

I have an 8" check valve that I need to replace that is in the vertical plane 11" from the discharge of a 1435 gpm pump.

Im a starting engineer and I was set a task to design a flotation system for an unmanned device that drops to seabed, and has to pop up back to the surface.