Patent ID: 8720849
Filing Date: 2014-05-13
Classification: F01M,F16K,Y10T

Abstract:
1. An apparatus for use as a low gain pressure relief valve, the apparatus comprising: a valve housing having a bore including a wall, the valve housing and bore defining a longitudinal axis, the valve housing having an inlet port and an outlet port, the outlet port having a first wall and wherein the wall of the bore intersects with the first wall of the outlet port at an angle less than ninety degrees; a valve body located within the passage and including a piston portion having at least one outer circumference portion, a top and a bottom, the at least one outer circumference portion blocking the inlet port of the valve housing when the valve body is located in a first or closed position and the at least one outer circumference portion for connecting the inlet port of the valve housing with the outlet port when the valve body is located in a second or open position and the piston portion of the valve body includes a first reduced diameter portion extending from the at least one outer circumference portion and toward the top of the piston, wherein the piston portion of the valve body further includes a tapered portion extending from the first reduced diameter portion and to the top of the piston and the tapered portion has an angle of between about 5 degrees and about 60 degrees from the wall of the outer circumference of the valve piston; a biasing member for biasing the valve body toward the first or closed position, wherein the inlet port is for admitting a fluid to the top of the piston portion of the valve body to move the valve body against the biasing force of the biasing member and to connect the inlet port with the outlet port for expelling the fluid from the passage; and wherein the bore of the valve housing includes a counterbore located at the intersection of the wall of the bore and the first wall of the outlet port, the counterbore including a first counterbore surface extending in a plane aligned perpendicular to the longitudinal axis of the valve body and perpendicular to the wall of the passage such that the plane of the first counterbore surface is not in the same plane as, and is at an angle with respect to, the first wall of the outlet port, wherein said counterbore creates an opening edge that eliminates contact between the wall of the bore and the first reduced diameter portion of the valve body.