b'ASG SERIESA S G S E R I E SLAPPED BODY/DISC SEATS (METAL TO METAL) RESILIENT SEAT DESIGNAPI598metalseatallowsaleakageof3cc/inchofbore/minute. IncreasedseatlifeisensuredbyeliminatingtheproblemoftheTheSupercheckdisc&seatfacesaremachinedtoobtain heelofplatesdraggingontheseatduringopening.Thesoft50~66%lowerleakagethanAPI598allows. seatisheatbondedandmouldedintoarecessedbodygroove.Superchecksoftseatedvalvesareleaktightshutoff.Thediscfloatsontheseatlipandalsomakesmetaltometalseatcontact,providingametalseatbackup.HEAT BONDED RESILIENT SEAT END TYPESRaised FaceRing Joint Plain FaceOpen Closed (serrated)SUPERCHECK - Check Valves - Wafer Style 9'