Patent ID: 7708254
Filing Date: 2010-05-04
Classification: F16K

Abstract:
1. A valve actuator linkage apparatus, the linkage apparatus comprising: a first member having a first end and a second end, wherein the first end is attached to a rotatable shaft; a second member having a first end and a second end, wherein the first end of the second member is pivotally attached to the second end of the first member; a third member having a first end and a second end, wherein said first end of the third member is pivotally attached to the second end of the second member and the second end of the third member is pivotally attached to a stationary point; and a fourth member having a first end and a second end, wherein the first end of the fourth member is pivotally attached to a mid-section of the third member and the second end of the fourth member is pivotally attached to a valve stem wherein the apparatus is capable of being set in a locked position, preventing movement of the valve stem, when the first member and second member are brought into alignment and the aligned first and second members substantially form a ninety degree angle with the third member.