F - Mech Eng,Light,Heat,Weapons – 15 – B
Patent
F - Mech Eng,Light,Heat,Weapons
15
B
137/81
F15B 13/02 (2006.01) F15B 13/01 (2006.01) F15B 13/043 (2006.01) F16K 31/40 (2006.01)
Patent
CA 1195586
A PROPORTIONAL CONTROL VALVE Abstract of the Disclosure A proportional control valve is described having a housing with a bore formed therein. Communicating with the bore is a fluid inlet and a fluid outlet, the opening therebetween being controlled by a first valve. When the first valve is in a closed position, fluid flow between the inlet and the outlet is prevented and when the first valve is in an open position, fluid flow therebetween is permitted. The first valve contains passages therein which communicate between the fluid inlet and the fluid outlet. Also positioned within the bore is a second valve which is aligned with one of the passages formed in the first valve. As the second valve is moved to a closed position, fluid flow through the passage is cut off and as the second valve is opened, fluid flow through the passage is permitted. A sleeve is also positioned within the bore which is constructed of a non-magnetic section sandwiched between two magnetic end sections. The sleeve contacts the first valve and is formed such that the non-magnetic section surrounds a portion of the second valve. The proportional control valve also contains an electromagnet for linearly moving the second valve in response to an input signal. Movement of the second valve creates a fluid flow path across the first valve and establishes a pressure differential which causes the first valve to follow the movement of the second valve. Likewise, movement of the first valve causes the sleeve to move in a light direction thereby providing an essentially constant air gap between the upper surface of the second valve and the end of the sleeve. This constant air gap is beneficial in that it permits the stroke of the first valve to be increased without increasing the power input to the electromagnet.
433238
Borden Ladner Gervais Llp
Deere & Company
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