In a lower kelly valve positioned beneath the kelly of a drill string connected to surface drilling equipment and mounted between an internally threaded lower tubular member defining a downstream flow

In a high pressure ball valve including a valve body having coaxially aligned inlet and outlet ports, a control chamber between said ports and a bonnet aligned with the control chamber.

A union-type ball valve comprising: a valve body having a fluid passage therethrough; at least one connecting sleeve having a flange portion at an end thereof and at least one union nut for releasably

A ball valve construction particularly suited for forming large diameter ball valves includes a main valve body formed from extruded plastic pipe and having a central through passage with a valve ball

A ball valve, especially for use between adjacent sections of a pipe line conducting an inflammable fluid, said ball valve comprising a valve housing a valve ball in said housing and having a through-

In single-handle faucets, the ball valve mixes hot and cold water based on the placement of the handle. When the handle is placed in the off position, the ball valve prevents further water flow from t

A ball valve for refrigerating system includes a valve body, a valve seat that fits into the valve body by a screw thread, a valve ball accommodated within the valve body, two plastic sealing elements

Valve's Source engine technology--the same used to power Half-Life 2, Team Fortress 2, and Portal--is available for license to any game developer.