The soft seal valve means the valve body and the valve disc/ball both are metal in the structure, between them is metal to metal. For the hard seal valve, machining accuracy and technology are relatively difficult, generally used in high pressure. Generally, it is required to do hardening treatment, and the ball and valve seat should be continuously ground to achieve sealing. The production cycle of hard seal ball valve is long and the processing is complex. It is not easy to make hard seal valve.

In the butterfly valve, hard seals are single eccentric, double eccentric, and triple eccentric butterfly valves.The hard seal is precisely processed with the valve seat material to ensure the matching accuracy with the valve core (ball), generally including stainless steel and copper.

Hard Seal Metal Seal Butterfly Valve

Hard Seal Ball Valve

Metal Seal Ball Valve