Triple Eccentric Butterfly Valve With Laminated Seal
The butterfly valve is a type of rotary control valve with the advantages of simple structure, small size, lightweight, and high flow control characteristics. It is widely used in petrochemical, metallurgical steelmaking, water treatment, and electric power industries. The early butterfly valve could not withstand high temperatures and large pressure and had a big leakage problem. The current triple eccentric butterfly valve is designed with three points of offsets – radial, shaft, and seat cone axis angle eccentricity – to eliminate rubbing between the sealing surfaces and extend the life of the seal. This unique design makes the valve a metal-to-metal seal and can withstand severe operation conditions.Learn more:shiphamvalves.com
Choosing the Right Material for Triple Eccentric Butterfly Valves: A Buyer’s Guide
The friction behavior between the disc and the seat is determined by the interaction between the valve stem rotational speed the shedding of vortices and the flow-induced forces. The frequency characteristics of these external forces are mainly determined by the pressure fluctuations and the natural frequencies of the disc-stem assembly. Consequently, it is important to study the pressure fluctuation characteristics inside the valve in order to identify the optimum design of the valve.
The experimental modal analysis of the cryogenic triple eccentric butterfly valve (TOBV) with laminated seal has been carried out to discover contact stress behaviors at different temperatures. The results show that the rubbing between the seat and disc increases with the increasing of the operating temperature, and it is important to optimize the design of TOBV to guarantee its operability and safety.