Pumps – Expansible chamber type – Valved piston
Reexamination Certificate
1998-12-21
2001-02-06
Walberg, Teresa (Department: 3742)
Pumps
Expansible chamber type
Valved piston
C417S056000, C166S105000
Reexamination Certificate
active
06183225
ABSTRACT:
BACKGROUND OF THE INVENTION
Reciprocating piston pumps have been well known for many years for paint and other viscous materials. While current designs are generally satisfactory for their intended use, users are always desirous of increased packing life so as to prevent interruption of jobs and productivity.
SUMMARY OF THE INVENTION
It is therefore an object of this invention to provide a piston port design that reduces turbulence, Eddy currents, and loading in the piston are of the pump.
It is further an object of this invention to provide increased overall pump efficiency and performance and to eliminate the need for a piston ball stop as the invention creates its own from the rod material.
It is further an object of this invention to provide a sight window for ball wear inspection and thus eliminate the need to remove the piston head and damage the packing stack.
Depending on the pump sizing, the countersink hole will be in an optimum flow state which thereby reduces eddy currents and fluid traps by being machined to an angle within a range of 20-80 degrees. This angle also reduces potential wear patterns in the cylinder wall which can serve to reduce pump life.
The countersinks allow for a sight window that not only reduces restriction and blockage but allows visual inspection to review ball wear without removing the piston head. This countersink further provides radial and angular flows which serve to reduce side load to a minimum during the down stroke.
A flat from the flat bottom drilling provides a precise ball stop limiting ball travel tolerance to a desired distance. The angle must also be related to a dimension “A” as shown in the accompanying drawings and which is determined by the relationship between dimensions X, Y, Z and the 20-80 degree angle. With the two holes meeting at an angle, the pin for a ball stop is able to be removed and replaced with material from the rod thus reducing parts and assemblies in addition it provides precise ball travel dimension when combined with a one piece fixed head for the piston.
The ball head force pressure is in a direct line of the ball to enhance speed and direct line for seating. A key feature in making this design work is the internal ball guides machined into the piston to allow full ball guide alignment and full side exposure without allowing the ball to block the exit ports or escape through the ports.
These and other objects and advantages of the invention will appear more fully from the following description made in conjunction with the accompanying drawings wherein like reference characters refer to the same or similar parts throughout the several views.
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Farrow Douglas B
Fastovsky Leonid
Graco Minnesota Inc.
Walberg Teresa
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