Dervos provides high performance butterfly valve products, including Hard seal and soft seal butterfly valve, triple offset/double offset/centric butterfly valve, Lug type / Wafer type/ Hoop type/ Flanged ended butterfly valve, and three-way butterfly valve etc. Especially our Bi-directional seal butterfly valve can be tested at 1.1 times design pressure with zero leakage at both directions.
Butterfly valve is a kind of valve that takes a disc as closing part (butterfly board) which rotates around the valve axis to achieve opening and closing. The valve is mainly used for cut-off and throttling on pipeline. A plate or disc is positioned in the center of the pipe. The disc has a rod passing through it that is connected to an actuator outside of the valve. Rotating the actuator turns the disc either parallel or perpendicular to the flow. The flow of medium may be controlled by changing deflection angle of butterfly board. Butterfly valve is suitable for pipeline that transports various corrosive, non-corrosive fluids in producer, coal gas, natural gas, liquefied petroleum gas, city gas, hot and cold air, chemical smelting and power environmental protection, building water supply and drainage and other engineering systems for regulating and cutting off medium flow.

 Hármas excentricitású pillangószelep, 16”, karima közé építhető

EN 593 pillangószelep, DN2000, PN6, RF, WCB

Karima közé építhető pillangószelep, DN1400, PN6, WCB

 RF karimás pillangószelep, 30”, 150LB, WCB

CF8 pillangószelep, 12”, RF, 300LB

ISO 5752 Karima közé építhető pillangószelep, GG25, PN10

 API 598 Karimás pillangószelep, 28”, PN20

WCB Karima közé építhető pillangószelep, PN20, DN500

CF8 Kézi csigahajtóműves pillangószelep, RF, 150LB

 Kézi csigahajtóműves pillangószelep, Lug típusú, 16”

GGG40 RF karimás pillangószelep, PN20, DN350

GG25 Kézikaros pillangószelep, API 609, DN200