Fluid injection pump with internal air actuator valve
OwnerJames A. Kyerinventor
Life of this patent
Estimating the term…
Abstract
A injection pump includes a needle valve which is disposed in the pump body cap. An air actuator valve is disposed in the pump piston head. The amount of air fed is controlled by the gap between the needle valve and a needle valve seat which is also located in the pump body cap. At the end of the pumping stroke, a spring on the air actuator valve contacts the bottom surface of the body cylinder chamber to cause the air actuator valve to open and release the trapped air from the body cylinder chamber through the air actuator valve so that the air can exit the pump. This action allows the spring around the piston and plunger to release and return the piston and plunger to the starting position.
Claims16
A fluid injection pump comprising:
- a tubular body member, said body member having an elongate cylindrical wall, an open proximate end and an open distal end;
- a first chamber housed within said body member, said first chamber positioned adjacent said proximate end;
- a second chamber housed within said body member, said second chamber positioned adjacent said distal end;
- a cap member, said cap member removably attached to said proximate end in fluid tight relationship;
- a passageway disposed in said cap member, said passageway in fluid communication with said first chamber;
- a first valve member, said first valve member disposed in said passageway for controlling fluid flow there through;
- a piston head, said piston head positioned in said first chamber for reciprocal movement therein;
- a second valve member, said second valve member disposed on said piston head;
- said piston head being a disc shaped member having opposed planar surfaces;
- an opening formed through said piston head and through said opposed planar surfaces, said second valve member positioned in said opening;
- a bore disposed in said piston head parallel to said opposed planar surfaces, said bore terminating at said opening formed through said piston head;
- and
- a locking mechanism disposed in said bore for securing said second valve in said opening.
A fluid injection pump comprising:
- a tubular body member, said body member having an elongate cylindrical wall, an open proximate end and an open distal end;
- a first chamber housed within said body member, said first chamber positioned adjacent said proximate end;
- a second chamber housed within said body member, said second chamber positioned adjacent said distal end;
- a cap member, said cap member removably attached to said proximate end in fluid tight relationship;
- a passageway disposed in said cap member, said passageway in fluid communication with said first chamber;
- a needle valve member, said needle valve member disposed in said passageway for controlling fluid flow there through;
- a piston head, said piston head positioned in said first chamber for reciprocal movement therein;
- a second valve member, said second valve member disposed on said piston head;
- a fluid suction conduit positioned at said distal end of said tubular body member, said suction conduit in fluid communication with said second chamber;
- a fluid discharge conduit positioned at said distal end of said tubular body member, said discharge conduit in fluid communication with said second chambers;
- said piston head being a disc shaped member having opposed planar surfaces;
- an opening formed through said piston head and through said opposed planar surfaces, said second valve member positioned in said opening;
- a bore disposed in said piston head parallel to said opposed planar surfaces, said bore terminating at said opening formed through said piston head;
- and
- a locking mechanism disposed in said bore for securing said second valve in said opening.
Dependencies are inferred from the claim text.