Connection AISI 316 PN 10-16, DN100 150LB Wafer butterfly valves
General purpose, resilient seated butterfly valve, wafer design (dual drilled Ansi 150/AS Table E),
cast iron body, 316SS disc, 410SS stem, EPDM or NBR seat, gear operated. Rated up to 16 bar.
Sizes- 14″ (DN350)→ 36″ (DN900)
* Options: Various seats including viton, neoprene, EPT, silicon, hypalon. 316SS stem,
Aluminium bronze or DI nylon coated disc, Ductile iron body
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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