Casting Study: Double-Diaphragm Pump – Warren Rupp

Major Selection Criteria: Mechanical Properties, Net Shape
Alloy: ZA-8 (ZL8, ZL0810, ZnAI8Cu1, alloy 8, ZA8)
Application Field: Industrial
Application Size: 0.203 in. x 0.553 in.; 0.476 in. x 1.181 in.; 0.476 in. x 1.375 in.
Surface Finish: As-Cast
Casting Technique: Pressure Die Casting
Source: CrecoCast, Seville, OH

valvespace2_photo2_caseID167A series of machined stainless steel air valve spacers are replaced with zinc die castings. Because of the spacer’s large flow areas, engineered plastics do not have the required strength to maintain shape and rigidity. Die cast ZA-8 was chosen for high mechanical properties and net shape production. In addition to cost reduction, die casting maximized air flow by allowing the spacer to be designed for fit and function without machining restrictions. Three spacer sizes are used for five pump models.