Pulsation dampener for low output systems

Claim 1

A low output pulsation dampener device comprising, in combination, an upper generally cylindrical shell part and a lower generally cylindrical shell part, each of said parts including at one end a generally hemispherical end and at the other end a radially directed flange, said flanges being disposed in juxtaposition, and including opposed annular registering groove portions, a separator assembly interposed between said shell parts, said separator assembly comprising a resilient elastomeric member having an enlarged annular bead sealingly clamped between said registering annular grooves, clamp means interposed between said flanges maintaining said bead in compressed relation within said grooves, a liquid port formed in said lower shell part, a valve member carried by said bladder and shiftable toward and away from said liquid port responsive to pressure variations in said liquid port, a gas charging valve formed in said upper shell part, gas under pressure disposed within said upper shell part for maintaining said valve member in a normally seated position on said valve seat, said device being characterized by the volume of said upper shell part comprising substantially three or more times the volume of said lower part and by the lower shell part comprising a corrosion resisting metallic material and said upper shell part comprising a different and less expensive metallic material.