Wafer Design Cast Iron Body (DI 8″-12″), 316SS Disc, 316SS Stem Seated Butterfly Valve
General purpose, resilient seated Butterfly Valve, wafer design, cast iron body (DI 8″-12″),
316ss disc, 316ss stem, EPT, NBR or Viton seat, 10-position notch plate & lever-rated 16 bar.
Sizes- 1½” (DN40)→ 12″ (DN300)
* Options: Various seats including neoprene, EPDM, silicon, hypalon. 304 or 410ss stem,
aluminium bronze or DI nylon coated disc, Ductile iron body, Undercut disc, Gear Operator, Nylon 11 coating.
Epoxy paiting suitable for drinking water applications.
The wafer butterfly valves are widely applied, thanks to there multiple functions of regulation and on-off valves. Thanks to the EPDM gasket and to the epoxy coating, the wafer butterfly valves can be installed in drinking water plants, but they can also be applied for sewage or brackish water with inox disc (fig.1401) and body not in touch with the fluid. The wafer butterfly valves are manufactured as centric type disc, they can stand both directions of fluid and are maintenance-free. With EPDM sleeve, they can stand maximum 130°C temperature. The wafer butterfly valves can be installed between welding neck flanges EN PN 10-16 and ANSI #150, without any need of additional flange gaskets. Such valves can be installed in any position. The wafer butterfly valves come with lever (standard execution); reducing gear, pneumatic operator with single or double effect, electric actuator on request.
A Butterfly valve is a quarter-turn rotary motion valve, that is used to stop, regulate, and start the flow. Butterfly valves are a quick open type. A 90° rotation of the handle can completely close or open the valve. Normally, they are used in systems where a positive shut-off is not required. In this article, you will learn about following types of Valve.
Large Butterfly valves are usually equipped with gearbox type actuator, where the handwheel is connected to the stem via a gearbox. This will reduce the force but at the same time reduce the speed of the operation. This type of valve should be installed in the open position. If the valve is closed during installation, the rubber seat will wedge against the valve disc and make it difficult to open.
Types of Butterfly Valves Based on Body Construction
Based on the type of ends of the body butterfly valves are available in following types.
Both Flanged Ends
Wafer Type Ends
Lug Type Ends
Butt Welded Types Ends
The wafer body is placed between pipe flanges, and the flange bolts surround the valve body. A wafer type butterfly
valve is easy to installed but it cannot be used as an isolation valve.
Butterfly valves can be metal-to-metal seated, soft seated, or with a fully lined body and disc. The first image is of a
soft seated fully lined body and disc valve. Second, is a soft seat with metal disk and the third is metal to metal seat type valve.
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