Resilient Seated Butterfly Valve

Series 7200 resilient seated butterfly valves are very reliable valves for tight shut off applications. These valves are suitable for majority of applications. Having years of field application, expertise and successfull development of full range of High Performance butterfly valves, Dembla has developed series 7200 valves to meet the economical solutions for today’s fluid process industry.

Specifications

Sizes : Dn50 - DN 500 (2”- 20”)
(With replaceable Seat)
DN600 - DN2000 (24” - 80”)
(With Bonded / Lined Seat)

Ratings : PN6, PN10, PN16, ANSI 150#

Temperature Range : -34ºC to + 150ºC

Design : EN 593 / API 609

Face To Face : EN 558 Series 20 / API 609

End Connections : Wafer, Lug, Flange

Top Flange : ISO 5221

Testing : EN 12266-1, ISO 5208, API 598, FCI 70-2

Features

1. Top Flange according to ISO 5221 for direct mounting of actuators.

2. Acetel top bush, guides stem and absorbs side thrust due to line pressure on the stem and disc.

3. Locating Holes for easy installation. Two holes on DN 50-DN300, Four holes on DN350- DN600.

4. Ductile Iron, Nylon coated disc for corrosion resistance, Super Duplex and Aluminum Bronze discs
available on request.

5. Unique locking system for rubber seat eliminates dislocation of seat during disc closing and opening.

6. Single piece heavy duty body with extra extended top flange for piping insulations.

7. Heavy duty stems with square or key way arrangement for direct mounting of various actuators.

Construction Details

Valve Body

Valve bodies are available in three constructions. Wafer type, Lug type and Flange type. The wafer type bodies have two locating lugs (DN50- DN300) and four locating lugs
(DN 350 and above) for easy installation. Bodies are externally coated with epoxy paint as standard. Top flanges are according to ISO 5211 for direct mounting of actuators.

Disc

The discs are heavy duty with two hubs for shaft attachment for sizes
(DN50-DN500). Higher sizes are constructed with through one piece shaft. The discs are coated with Nylon 12 coating for superior corrosion resistance. The edges are rounded and polished for effortless seating during closing and opening. Discs in Aluminum bronze and Super Duplex materials are available for sea water applications.

Seat

Seats are replaceable type for (DN50- DN600) and bonded (lined) with bodies for (DN650 and above). The seats have groove located to avoid rating movement (dislocation) during disc opening and closing. Replaceable seats (DN50-DN600) are available in Nitrile EPDM Viton Silicon
Bonded seats (DN650 and above) are available in Ebonite and EPDM.

Shaft

The shafts are available in two piece and single piece constructions. The shafts are connected to disc using pins. The seat at top and bottom makes sealing so effectively that the shaft never come in contact with the line fluid.

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