Valve Check
Check valves automatically check or prevent the reversal of flow. Basic types of check valves are the swing check, lift check, and wafer design.
The swing check valve has a hinged disc, sometimes called a flapper, which swings on a hinge pin. When flow reverses, the pressure pushes the disc against a seat. When tight closure is required, one may choose a swing check valve with a flapper composition disc of rubber or Teflon rather than of metal. Swing check valves offer little resistance to flow. Check valve placement should be a minimum of 5 pipe diameters downstream from the pump discharge or other source of turbulence.
The lift check valve has a guided disc that is raised from the seat by upward flow pressure. Reversal of flow pushes the disc down against the seat, stopping backflow. Lift check valves have considerable resistance to flow, similar to that of a globe valve.
The wafer check valve is another common check valve, and fits between flanges in the same fashion as a butterfly valve. Wafer check valves are of two types: a dual flapper design that is hinged on a centerpost, and a single flapper design that is similar to the standard swing check valves. Wafer check valves are generally used in larger size piping (4-inch and up), as they are much lighter and less expensive than traditional flanged end swing check valves.
Manufactures and Suppliers Participating in OPUS
ANVIL International
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(click for details) Embassy Group LTD
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(click for details) F.W. Webb Company
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(click for details) Ferguson
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(click for details) Johnson Controls, Inc.
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(click for details) Metraflex Company
- Metraflex is a manufacturer and marketer of the "PoopLoop" and magic "Quite...
(click for details) Milwaukee Valve Company, Inc.
- Serving the mechanical contractor since 1901, Milwaukee Valve produces the highest quality gate,...
(click for details) Mueller Industries, Inc.
- Mueller Industries is the leading U.S. manufacturer of copper tube, copper fittings, and plastic...
(click for details) NIBCO INC.
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(click for details) Taco, Inc.
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(click for details) Tyco/GRINNELL Mechanical Products
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(click for details) Unique Fittings and Flanges
- Unique Fittings and Flanges and its parent company Unique Industrial Product Co., supply quality...
(click for details) Victaulic
- Victaulic is the world's leading manufacturer of mechanical pipe joining products. For over 80...
(click for details) Viega LLC
- Founded in 1899, Viega is the only manufacturer to offer press fitting solutions in multiple...
(click for details) Watts
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(click for details) WinWholesale, Inc.
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(click for details) Zurn Industries, LLC
- Zurn markets and manufactures roof/floor drains, interceptors, cleanouts, water closet carriers,...
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