Four valve disc frictionless ball valve

A four valve disc frictionless ball valve, comprising a valve body;

• a spherical valve core assembly, installed in the valve body;
• a valve stem, installed on the spherical valve core assembly, wherein the valve stem comprises an upper valve stem and a lower valve stem, wherein the upper valve stem and the lower valve stem are arranged coaxially;
• an upper valve cover, installed on an upper portion of the valve body;
• and
• a lower valve cover, installed on a lower portion of the valve body;
• wherein:
• the spherical valve core assembly comprises a wedge-shaped valve core;
• a first end of the upper valve stem is installed at a top of the wedge-shaped valve core, and a second end of the upper valve stem passes through the upper valve cover and extends to an outside of the upper valve cover;
• a first end of the lower valve stem is installed at a bottom of the wedge-shaped valve core, and a second end of the lower valve stem is installed in a lifting cavity of the lower valve cover;
• a first pair of oppositely arranged wedge-shaped sides among four sides of the wedge-shaped valve core are a pair of closed-position wedge-shaped sides, and a second pair of oppositely arranged wedge-shaped sides among the four sides of the wedge-shaped valve core are a pair of open-position wedge-shaped sides;
• each of the pair of closed-position wedge-shaped sides are arranged adjacent to each of the pair of open-position wedge-shaped sides;
• a closed-position valve disc is installed on each of the pair of closed-position wedge-shaped sides;
• a closed-position guide key is respectively arranged at middle positions of each of the pair of closed-position wedge-shaped sides along an axial direction;
• a closed-position guide groove is arranged on each closed-position valve disc along the axial direction;
• the closed-position valve disc is installed on each of the pair of closed-position wedge-shaped side by engaging the closed-position guide key with the closed-position guide groove;
• an open-position valve disc is installed on each of the pair of open-position wedge-shaped sides;
• an open-position guide key is respectively arranged at middle positions of each of the pair of open-position wedge-shaped sides along the axial direction;
• an open-position guide groove is arranged on each open-position valve disc along the axial direction;
• the open-position valve disc is installed on each of the pair of open-position wedge-shaped side by engaging the open-position guide key with the open-position guide groove;
• the wedge-shaped valve core is provided with a wedge-shaped valve core flow channel, wherein the wedge-shaped valve core flow channel is radially formed and penetrates the pair of open-position wedge-shaped sides and the open-position guide key;
• the open-position valve disc is provided with a valve disc flow channel, wherein the valve disc flow channel is coaxially arranged corresponding to the wedge-shaped valve core flow channel;
• the valve body is provided with a valve body flow channel, wherein the valve body flow channel is coaxially arranged corresponding to the wedge-shaped valve core flow channel;
• a top of the closed-position valve disc and a top of the open-position valve disc each form a clearance fit with the upper valve cover;
• a bottom of the closed-position valve disc and a bottom of the open-position valve disc each form a clearance fit with the lower valve cover;
• the upper valve cover and the lower valve cover are configured to axially limit the closed-position valve disc and the open-position valve disc;
• and
• the closed-position valve disc is in sealing contact with an inner wall of the valve body around the valve body flow channel.