Ball valve having a magnetic seat sealing device

A ball valve having a magnetic seat sealing device, comprising:

• a valve body formed with a valve body cavity and a flow passage intersecting and in fluid communication with said valve body cavity;
• a valve seat, including at least one seat ring disposed within said valve body cavity;
• a valve ball rotatably disposed on said valve seat within said valve body cavity for selectively closing/opening the flow passage of the valve body;
• a valve bonnet engaging the valve body to confine said valve body cavity and formed with a valve stem hole;
• a valve stem passing through said valve stem hole of the valve bonnet and rotatably drivingly engaging said valve ball;
• characterizing by comprising:
• a magnetic seat sealing device comprising:
• a magnetic mechanism including a permanent magnet having a center coaxial with the valve stem and rotatable together with the valve stem;
• a magnetic permeable block including two magnetic permeable block halves made of magnetic permeable material which are integrally interconnected by non-magnetic material integrally interposed therebetween, and centrally formed with a circular recess for receiving the magnet to rotate therein;
• and
• at least one magnetically actuating block made of magnetic permeable material and integrally engaging said valve seat ring for actuating the valve seat ring to tightly compress against the valve ball by a magnetic force of the permanent magnet and to maintain a high leak-tight sealing effect between the valve ball and seat.