NBR Rubber seated butterfly valve is installed between two flanges. The butterfly valve is kept in place by using bolts or studs and nuts from flange to flange. This type of installation, of course, makes it impossible to disconnect just one side of the piping system from the valve.
 

NBR 　Rubber seated butterfly valve Features

Center Lined, Resilient Seat

Bi-Directional Sealing

Shutoff and Throttling Operation

Wafer Body Type, Lug Type or Flanged Type

Applicable Standards

Design & Manufacture: API 609, EN 593, AWWA C504

Face to Face Dimension: API 609, EN 558

End Connection: ASME B16.5, EN 1092

Test and Inspection: API 598, EN 12266

Sizes: 2" - 48" or DN50 - DN1200

Pressure Rating: Class150 or PN10 - PN16

Materials of Valve Body: GG25, A126 B, GGG40, A536, WCB, LCB, CF8, CF3, CF8M, CF3M, etc.

Operated by: Lever, Gear, Pneumatic, hydraulic and Electric actuator