Wafer type butterfly valve (D71X)

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Description: The wafer style butterfly valve is designed to maintain a seal against bi-directional pressure differential to prevent any backflow in systems designed for unidirectional flow. It accomplishes this with a tightly fitting seal; i.e., gasket, o-ring, precision machined, and a flat valve face on the upstream and downstream sides of the valve.

Lug-style valves have threaded inserts at both sides of the valve body. This allows them to be installed into a system using two sets of bolts and no nuts. The valve is installed between two flanges using a separate set of bolts for each flange. This setup permits either side of the piping system to be disconnected without disturbing the other side.

A lug-style butterfly valve used in dead end service generally has a reduced pressure rating. For example a lug-style butterfly valve mounted between two flanges has a 150 psi pressure rating. The same valve mounted with one flange, in dead end service, has a 75 psi rating.

Standards:

  Design: EN 593, API 609.

  Face to Face: EN 558-1, series 20.

  Flange: BS EN 1092, ANSI B16.5.

Materials: Ductile iron, cast iron

Nominal sizes: DN80—300mm

Pressure: PN6/10/16

Corrosion protection: Inside and outside FBE.

Suitable medium: Water, oil, steam.

Package: wooden case with plastic layer, wooden pallets with plastic layer, steel crates.

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