BALL VALVES :: SIDE ENTRY TRUNNION :: DESIGN Our design dept. works with the more sophisticated and advances information engineering applications for the realisation of the products. Thanks to these simulating programs our valves are designed in 3D and their structure is verified through the Finite Elements System in order to obtain the simulation of a perfect functioning. Here below we show you an example of graphic representation concerning triple eccentric butterfly valves Valve body pipe submitted at an internal pressure of 6 bar The following images simulate a shaft during the torsion phase    Graphic representation concerning the powers distribution during the closure phase of the seal ring Seat features The independent springs precharge the seat of the Trunnion valves, ensuring the contact between the seat and the ball. This feature improves the seal even at different pressures. Design features The trunnion design is realised to maintain a fix position of the ball between the upper shaft and the lower Trunnion bolt. Operating stem The antiblowout system of the stem (which is independent from the ball) permits the gasket change with the valve in fully closed position, even under pressure. The shaft seal is ensured through three gaskets (two o-rings and one in graphite). Antistatic system according to BS 5146 The electrical continuity among all valve components is determined by a stainless steel charged spring between the ball and the Trunnion bolt. Low operation torque system Thanks to the self-lubricant bearings placed on the upper valve bolt and on the trunnion bolt the friction factor is reduced, improving the valve operation. Automatic pressure control system The valve is designed with a system that permits to regulate the pressure excess that could be created into the body. The excess pressure is regulated thanks to the loaded spring that will open the seat. By-pass and drain The by-pass and drain holes can be assembled upon customer request. Emergency seat In case of emergency the valve seal can be regenerated thanks to the "emergency seat" system that operates through the sealing supplied with the valve.