What is backflow prevention and the role of check valves

Excess Flow Check Valve Model 166 Series Wafer Style Features: Canadian Registration Number: OC13500.5C Click Here to View Dimensions Image All Size Values are ... Spring Kits; 304 Stainless Steel Nuts & Bolts; Drain Plug/Flush port; Braided Teflon Hinge Pin Packing. Resources: Check Valve Selection Chart ( ... The No. 375 check valve is made of a one-piece cast brass body. Designed to operate in any position, a sensitive spring has been added to close the poppet ... Check Valve Image, Model: Body Material: ANSI Class: Valve Type: CV12-CS, Carbon Steel A515 Gr. 70, 150, Short Pattern - Wafer Type. Long Description ... VC 10.300 Check valve. This check valve is needed to connect multiple VC 10 vacuum controllers in series to a vacuum source. Every vacuum controller requires ... SMC pilot check valves permit flow in one direction and only allow reverse flow if supplied with an appropriate pilot signal. They are available in thread sizes ... The TrueClean CIP'able air blow check valve can be cleaned in place with a process line. It fits in place of an existing standard air blow check valve. The best practice is to place the check valve outside the aquarium (not in the water), close to the top of the fish tank. This position stops the water at the ... The Series 225 Auto-Soft is a flow-actuated check valve used for throttling roughing pumps during initial evacuation. Auto-Soft check valves close very quickly ... The Soval 1036 Series Cast Iron Silent Wafer Check Valve has an economical and compact body design and stops water hammering in its tracks.