Patent ID: 8567435
Filing Date: 2013-10-29
Classification: F16K,Y10T

Abstract:
1. A valve comprising: a valve body including a valve seat defining a fluid aperture and inclined at an angle from 5 to 35 degrees relative to a cross section of the valve body taken at 90 degrees relative to a fluid flow axis through the valve body; a valve head for contact with the valve seat for closure of the fluid aperture; a pair of elongate lever arms defining a longitudinal axis, each of the lever arms having a first end and an opposite second end, the first end of each lever arm being connected to the valve head, the lever arms being offset from the valve head, the lever arms being rotatable about a pivot axis located between the first ends and the second ends, the lever arms being symmetrically laterally spaced apart on opposite sides of the fluid flow axis to define an elongate space therebetween, the pivot axis being located in said space and said space extending on both longitudinal sides of the pivot axis; and an elongate tension spring having one end anchored to a first anchor point located between the second ends of the lever arms and an opposite end anchored to a second anchor point on the valve body, the elongate tension spring being configured to: wherein at least a portion of the spring is accommodated in the elongate space between the lever arms when the valve head is fully opened, said at least a portion of the spring extending on both longitudinal sides of the pivot axis.