Butterfly Check Valve

characteristics of the butterfly check valve

Butterfly   check   valve is actually similar to the butterfly valve on the seating arrangement. But the functions affected by the two type of the valve are different on some aspects. Just like the other types of the check valve, the butterfly check valve is used to guide the flow in one direction and prevent the flow from reversing. But it can be aware that butterfly check valves are quite frequently used in systems using butterfly valves. Or it can be said that the butterfly check valve has taken advantages of both the butterfly valve and the check valve.

The butterfly check valve is designed basing on a flexible sealing member against the bore of the valve body at an angle of 45o.  And the flexible sealing members are available in Buna-N, Neoprene, Nordel, Hypalon, Viton, Tyon, Urethane, Butyl, Silicone, and TFE as standard and other materials. And the  short  distance  the  disk  must  move from full  open to  full closed inhibits  the "slamming"  action  found  in  some  other types    of    check    valves.

And for the valve body of the butterfly check valve, the basic design leads itself to the installation of seat liners constructed of many materials.  This permits the construction of a corrosion-resistant valve at less expense than would be encountered if it were necessary to construct the entire body of the higher alloy or more expensive metal. The valve body essentially is a length of pipe that is fitted with flanges or has threaded, grooved, or plain ends.   The interior is bored to a fine finish.