b'AGW SERIESA GW S E R I E SLAPPED BODY/DISC SEATS (METAL TO METAL) RESILIENT SEAT DESIGNAPI598metalseatallowsaleakageof3cc/inchofbore/minute. IncreasedseatlifeisensuredbyeliminatingtheproblemoftheTheSupercheckdisc&seatfacesaremachinedtoobtain50% heelofplatesdraggingontheseatduringopening.ThesoftlowerleakagethanAPI598allows. seatisheatbondedandmouldedintoarecessedbodygroove.Superchecksoftseatedvalvesareleaktightshutoff.Thediscfloatsontheseatlipandalsomakesmetaltometalseatcontact,providingametalseatbackup.HEAT BONDED RESILIENT SEAT END TYPESRaised FaceRing Joint Plain FaceOpen Closed (serrated)ThreadedEndsStyle20 SUPERCHECK - Check Valves - Wafer Style'