Triple Offset Valves or TOVs have an Elliptical Shaped Seat. When TOV Manufacturers tout "Dynamic Torque Sealing" they are highlighting the Sealing Mechanism (Torque Seated) and the reason the torque at Seating is so high, since the Elliptical Seat is being compressed into a circular shape...
I read with interest a post which asked, "What is the difference in a Position Seated and a Torque Seated Valve"? In reading the answers, I was disappointed that none came close to facts. As such lets start:
There are 4 Basic Valve Sealing Mechanisms:
1) INTERFERENCE FIT
2) PRESSURE...
Check out http://valveactuation.com/valve-application-training/
Covers most of the topics including:
- The 4 Functions of Valves
- Four Types of Sealing Mechanisms
- Materials of Construction
- Various Pressure Ratings
- ANSI Seat Classes and Leakage Rate Explanation
