Butterfly Check Valve

The Fangwen butterfly check valves with counterweight and oil cylinder are very reliable as they can regulate the closing time of the valve. These valves are applied in pipelines as non-return device, with flow allowed in one direction only. The butterfly check valves with counterweight are double eccentric type with tilting disc, the counterweight lever will facilitate the anti-hammer device and the oil cylinder will slow down the closure movement, to reduce any slam with noise. From DN 900 and up, they come with two counterweight levers and two oil cylinders, one on each side of the valve. Epoxy coated inside and outside, the double flanged butterfly valves can be installed in drinking water plants. NBR gasket seals are on the disc and can be replaced without dismantling the valves from the pipeline.

Features

- Flange: EN 1092-1 PN 10

- Face to face length: EN 558-1, serie 14. DIN 3202 F4

- Installation: horizontal / vertical with down-up flow direction.

APPLICATIONS

- Water supply

- Drinking water

- Irrigation plants

Swing Butterfly Check Valve

Features

» Design & Manufactured to API 6D, ASME B16.34 or Equivalent.

» P.T Ratings to ASME B16.34

» Face to Face Dimensions to API 6D or ASME B16.34

» Flanged Ends to ASME B16.5

» Butt-weld Ends to ASME B16.25

» Valves Marking to MSS SP-25

» Inspect & Tested to API 598 or API 6D

» Sizes Ranges from 12” thru 30”

» Pressure Ratings from Class 150 to Class 600, PN16 to PN100

» Ends Connections in Flanged R.F or RTJ, Butt-weld or Hub Ends

» Structured in Two Piece Bolted Body, One Piece Union Pressure Sealed Body

» A variety of body and trim material is offered, including carbon steel ASTM A216 WCB, WCC, Low Carbon Steel LCB, LCC, Alloy Steel WC6, WC9, C5, Stainless Steel CF8, CF8M, CF3, CF3M, Duplex & Super Duplex Steel A890 GR. 4A, 5A or F51, Special Materials in Monel, Alu. Bronze C95800, 95600 etc. Coatings may be provided for added corrosion or wear resistance. Hard-facing and weld overlays may also be supplied. Seats Options with metal-to-metal or bubble-tight resilient.

» Optional Bypass system, Dashpot & Counter-weight Assembly.

Fangwen Swing Butterfly Check Valves are designed and manufactured strictly to International Standards API 6D, ASME B16.34 or Equivalent, usually for big size Check Valves, counterweight assist to close, making the pipes and system more safely. Light weight disc reduce the water hammer to protect the pipes and reduce the flow resistance and pressure drop to the minimum possible extend with a feature of compact structure & Low emission service.