Thermoplastic Or Elastomeric seats are inserted inside a metallic holder (seat ring) to deliver smooth seating motion inside a ball valve. The leading functions of a tender-seated ball valve are The spring supplies the initial load (due to small elasticity of Teflon), even though the fluid force delivers the load https://bookmarkeasier.com/story19323531/5-easy-facts-about-steel-pipe-flange-described