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Webcheck valve symbol; DOWNLOAD THIS CHART. An engineer may also include specific details below the control valve symbol. These details may include the size, function, pressure rating, and connection type of the … WebSolder these valves to copper tubing for a permanent, leak-tight connection. They meet NSF/ANSI 61 for use in drinking water lines. All open to allow flow in one direction and … WebSolder these valves to copper tubing for a permanent, leak-tight connection. They meet NSF/ANSI 61 for use in drinking water lines. All open to allow flow in one direction and close when flow stops or reverses.. Flow coefficient (Cv) is the amount of water (in gallons per minute) at 60° F that will flow through a fully open valve with a difference of 1 psi … bretton woods calendar