Patent ID: 7644904
Filing Date: 2010-01-12
Classification: F16K,Y10T

Abstract:
1. A pressure relief valve for use with a conduit carrying a cementitious material displaced under pressure, said pressure relief valve comprising: a housing having a first inner generally cylindrical-shaped slot and attached to the conduit, wherein the attachment between the conduit and said housing defines a first aperture between the conduit and said cylindrical-shaped slot, said housing including a second aperture disposed in an opposed portion of said housing from said first aperture and located outside of the conduit; a cylindrical member extending substantially the length of said generally cylindrical-shaped slot in a tight-fitting manner, wherein said cylindrical member is freely rotatable in said cylindrical-shaped slot and includes a second generally linear, elongated slot extending through said cylindrical member, wherein an inner portion of said cylindrical member is aligned with an inner surface of the conduit so as to eliminate dead space between said conduit and said pressure relief valve in which cementitious material can collect and set so as to clog said relief valve and render said relief valve unusable; and a handle attached to an end of said cylindrical member for moving said cylindrical member between an open position for discharging pressure from the conduit, wherein the cylindrical member's slot is aligned with the first and second apertures in said housing, and a closed position, wherein the cylindrical member's slot is not aligned with the first and second apertures in said housing and the conduit carries the cementitious material in a sealed manner.