Patent ID: 7287541
Filing Date: 2007-10-30
Classification: G05D,Y10T

Abstract:
1. A fluid flow control device comprising: a valve having a fluid inlet, a fluid outlet and a flow path defined therebetween, the valve further including a valve seat in communication with the flow path and a valve stem disposed within the valve seat and cooperatively configured with the valve seat to cause the valve stem to advance or back off within the valve seat responsive to rotation of the valve stem about a first axis; a gear member coupled to the valve stem; and a linear positioning member having at least a portion thereof configured to complementarily engage the gear member, wherein the linear positioning member is configured to be displaced along a second axis and cause rotation of the gear member and the valve stem about the first axis upon such displacement of the linear positioning member along the second axis, and wherein the at least a portion of the linear positioning member which is configured to complementarily engage the gear member is configured as a substantially helically cut worm gear.