Abstract: A coupling for quickly connecting a cement head to a casing of an oil or gas well comprises tube-shaped upper and lower bodies that connected to each other and are telescopically adjustable. The upper body receives the cement head and the lower body attaches to the casing. A clamp mechanism utilizing split ring segments is located in the lower body and is actuated by a piston for quickly attaching or releasing the lower body to and from the casing.

Abstract: A pipe connector device for interconnecting first and second pipe elements using a retention member removably secured to the first pipe element by load elements. The retention member is secured to the second pipe element by pipe threads or a second retention member can be secured to the second pipe element by load elements and the first and second retention members threaded together. A seal is extended along a portion of the length of the first and second pipe elements adjacent to an end portion of each of the pipe elements to prevent leakage. This provides a fluid-tight seal which is relatively independent of any pressure exerted between the first and second pipe elements by the retention member.

Abstract: A stem-operated fire-resistant gate valve including an improved metal-to-metal stem backseat fusible ring assemblies for facilitating automatic stem backseating at pre-selected temperatures, spring enhancement of the backseating procedure, and an improved metal-to-metal gate seat.