Thermoplastic Or Elastomeric seats are inserted inside of a metallic holder (seat ring) to provide gentle seating motion in the ball valve. The principle functions of a tender-seated ball valve are Seat loading increases at a greater strain and for larger dimensions and becomes extreme, for your soft seated valve. https://getsocialsource.com/story4883783/the-fact-about-ss-flanges-that-no-one-is-suggesting