metal butterfly valve seat in principle, open the valve plate is almost close to equilibrium, because, driven by flow physical side but on the other side is driven by flow physical strength. But because the valve plate is not the same on both sides, namely the shaft installed in the side, while the corresponding side is relatively flat, industrial valves make the flow direction produces tendentiousness to both push valve open, and valve closed. In most cases, the double soft seat, and the structure of the metal seated valve when the valve plate of axial parts export oriented ( Downstream) , logistics process tends to open the valve. The other - , when the shaft parts for population ( The upstream) , logistics can help open valve. Failure mechanism of the actuator must consider sore moving direction, in order to produce the proper failure mode.

in concentric valve disc - Min arrangement ( disc center and the axis in the center of the valve accurately in a center line) 1 t, in any place, always in contact with the valve seat valve plate parts. In 0 ° open valve, bearing surface all contact with each other, and in any other position, there are two supporting surface contact, in this two place, contact with the valve seat valve plate edge. Because of frequent contacts, the seat structure of concentric disc has a tendency to wear large, especially in automatic control condition.

throttling process, may require that butterfly valve control the movement of their trip in the middle of a t a small range, on the two contact points caused by grinding to save. Wear in the process of the throttle is not obvious, but the valve is closed, finally can make the leak on the two points. In order to overcome problems often contact between the surface bearing, preferred the eccentric CAM valve disc - butterfly valve manufacturer The seat structure, can make the valve plate and valve seat when closing all the contact; But when the valve opens, valve plate and valve seat are no longer contact, valve co. , LTD. This structure makes the axis ( And valve plate) The center of the slight offset downward and away from the center of the valve. When the valve is closed, MinPan since the seat to ascend, and just pay off a - bearing surface Enough to avoid frequent contacts.

metal butterfly valve seat, double soft seats and metal seat due to the structure of the Industrial Valves disc and seat arrangement, unlike cut-off Industrial Valves core, in the industrial valve body assembly is not easy to design a flow characteristics. Butterfly valve, therefore, must use its inherent flow characteristic, is essentially parabolic. In order to obtain the flow characteristics, must use actuators with CAM locator to provide an improved flow characteristics.

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