Check valves are frequently made use of with some varieties of pumps. Piston-pushed and diaphragm pumps for example metering pumps and pumps for chromatography commonly use inlet and outlet ball check valves. These valves frequently appear like little cylinders connected into the pump head around the inlet and outlet traces. http://valvesandfittings35678.designertoblog.com/17902421/little-known-facts-about-hydraulic-check-valve