Zatkoff News: Quad® Brand Ground Rubber Balls

Quad® Brand Ground Rubber Balls

Quad® Brand Ground Rubber Balls from Minnesota Rubber are carefully moldedand precision ground for superior performance in the most critical applications.

Ground Ball Tip Sheet

• Solid, non-reinforced core ground balls are general used as check devices for pressures less than 120 psi.
• When designing an application to incorporate a check ball, the differential area between the projected ball area and the area of the ball channel should be slightly greater than that of the main flow area. This will minimize flow disruption due to the presence of the ball in the flow stream.
• The ball seat should have an included angle of 120° and have a .010"-.015" radius where the seat and the flow channel meet. For liquids, the ball seat should have a surface finish of 20́in RMS or better. For air or vacuum applications, the ball seat should have a surface finish of 10́in RMS or better.
• At pressures greater than 120 psi, there is a tendency for ground balls to become stuck in the ball seat (checking orifice). If this occurs often, it can damage the ball, eventually causing the ball to extrude through the orifice
• As a “rule-of-thumb,” the diameter of a check ball should be at least three times the diameter of the flow orifice. The larger the ball-to-orifice ratio, the lower the likelihood of ball extrusion.

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