4-Seat Design Multiport ball valve applications can present unique challenges for reliable valve sealing. With three or more ports, the valve must be able to seal in at least two different positions. To successfully achieve this requires either a designated flow direction or a seat design that allows for sealing from multiple directions. To address this, we incorporate a 4th seat on the blind flange. This allows consistent seating of the ball regardless of flow direction Certifications & Compliance Testing: API 598, ISO 5208 Design: ASME B16.34, ASME B16.5, ASME B16.105 Markings: MSS-SP-25, PED Certifications: SIL, PED