Diaphragm for a diaphragm pump

A diaphragm assembly comprising:

• a pump diaphragm comprising a central region surrounded by an annular flexible region, the central region having portion extending outward from a surface of the pump diaphragm, wherein sidewalls of the portion are configured to releasably mate to a diaphragm pump piston with no penetrations through the pump diaphragm;
• and
• a piston comprising:
• a first coupling region on a first side that is configured to couple to a driving shaft of an air-operated diaphragm pump, the first coupling region comprising:
• a cavity extending from the first side into the piston into a central raised portion of the piston, the cavity comprising threading configured to couple to the driving shaft,
• an outer recessed portion extending from an outer diameter of the piston radially inward;
• a first groove on the outer recessed portion, the first groove shaped to couple to a second pump diaphragm;
• and
• a plurality of threaded holes positioned around the outer recessed portion and offset radially outward from the cavity, each of the plurality of threaded holes configured to receive a threaded fastener to couple the second pump diaphragm to the piston;
• and
• a second coupling region on a second side that is configured to mate with the sidewalls of the central region of the pump diaphragm.

The diaphragm assembly of claim 19, further comprising the piston, the piston comprising:

• a threaded void extending from the rear surface of the piston, the threaded void configured to couple to a threaded end of a driving shaft;
• the outer recessed portion positioned along an outer diameter of the piston;
• a first groove extending from the outer recessed portion into the piston, the first groove shaped to couple to a first portion of the second pump diaphragm;
• and
• the plurality of voids extending from the rear surface of the outer recessed portion into the piston, the plurality of voids configured to receive a plurality of fasteners to couple the backup diaphragm ring to the piston in the outer recessed portion of the piston.

A diaphragm assembly comprising:

• a first pump diaphragm comprising a central region surrounded by an annular flexible region configured to releasably mate to a piston with no penetrations through the first pump diaphragm;
• a second pump diaphragm comprising a ring shape having an inner circumference and an outer circumference, wherein the inner circumference is coupled to a radial edge of the piston and the outer circumference is substantially coextensive with an outer circumference of the first pump diaphragm;
• and
• a backup diaphragm ring configured to mate with an outer recessed portion of a rear surface of the piston, the backup diaphragm ring comprising:
• a plurality of voids extending from a first surface of the backup diaphragm ring to a second surface of the backup diaphragm ring, each of the plurality of voids sized and arranged to pass a single fastener of a plurality of fasteners from the first surface to the second surface through the respective void of the backup diaphragm ring to couple each fastener to a respective void of a plurality of voids in the rear surface of the piston;
• and
• a second groove extending from the second surface of the backup diaphragm ring into the backup diaphragm ring, the second groove shaped to couple to a second portion of the second pump diaphragm.