These discs work in unison to perform the duties of both the pumping element and valving element. The hydraulic interaction between the discs creates vacuum and pressure simultaneously to move fluid from suction to discharge. Since the discs are not captive in the housing, they are not subject to the flex fatigue failure pattern associated with captive diaphragm pump designs. The discs are an integral elastomer design with rigid core and do not have any external metal components.
The double disc pump has a short stroke length created by eccentric cams pinned to the drive shaft. The pump design provides for positive valving on every stroke since the discs are mechanically driven on the seat. The pump incorporates an inlet side foot valve, also known as a clack valve. This device is a priming and re-priming aid and only sees action under a suction lift condition or when the suction line is under a vacuum condition. In flooded suction applications, this device does not get back to the seating surface and does not valve. The pump will operate without the clack valve on flooded suction applications. This unique design allows the pump to pass larger solids, rags and debris that would routinely cause problems like clogging and failure on other types of pumps internal check valves.
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