The Mack Valve rubber seated butterfly valve, which now uses the same black color and painting procedure of the current pipeline supply, has an exclusive anti-blowout stem device that guarantees safe operation and maintenance. This device is required by the API 598 standard. All rubber seated butterfly Mack valves have exclusive seats with two sets of incorporated o’rings on the flange contact surface and on the shaft contact area, avoiding the possibility of leakage. With ISO standard top flanges, the Mack Valve can receive any type of ISO flanged actuation, without the need for adaptors. The valve is produced in Brazil and can be exported worldwide accompanied with a package of MTRs with full traceability. All of the valves are full hydro tested according API 598, with zero leakage approval setting.