Air driven double diaphragm pump

A double diaphragm pump comprising

• air chambers;
• pump chambers, each including an inlet and an outlet;
• diaphragms, the air chambers and the pump chambers mating together, respectively, to form pump cavities, the diaphragms extending across the pump cavities, respectively, between the air chambers and the pump chambers;
• inlet flow connectors coupled with the pump chambers at the inlets, respectively, the inlet flow connectors each including a valve cavity;
• outlet flow connectors coupled with the pump chambers at the outlets, respectively, the outlet flow connectors each including a valve cavity;
• valves in the valve cavities, respectively, each valve including a valve seat, each of the inlet flow connectors further including a threaded valve seat attachment cavity adjacent the valve cavity threadably receiving one of the valve seats, the outlets of the pump chambers each including a threaded valve seat attachment cavity threadably receiving one of the valve seats, the valve seats each including a threaded section and a radially extending annular shoulder adjacent the threaded section, the threaded sections threadably fitting within the threaded valve seat attachment cavities, the outlet flow connectors adjacent the threaded valve seat attachment cavities and the pump chambers adjacent the threaded valve seat attachment cavities including radially outward sealing surfaces;
• compressible seals positioned between the radially extending annular shoulders and the radially outward sealing surfaces.

A double diaphragm pump comprising

• air chambers;
• pump chambers, each including an inlet and an outlet;
• diaphragms, the air chambers and the pump chambers mating together, respectively, to form pump cavities, the diaphragms extending across the pump cavities, respectively, between the air chambers and the pump chambers;
• inlet flow connectors coupled with the pump chambers at the inlets, respectively, the inlet flow connectors each including a valve cavity;
• outlet flow connectors coupled with the pump chambers at the outlets, respectively, the outlet flow connectors each including a valve cavity;
• valves in the valve cavities, respectively, each valve including a valve seat, a ball and a ball cage, each of the inlet flow connectors further including a threaded valve seat attachment cavity adjacent the valve cavity threadably receiving one of the valve seats, the outlets of the pump chambers each including a threaded valve seat attachment cavity threadably receiving one of the valve seats, the valve seats each including a threaded section, the threaded sections threadably fitting within the threaded valve seat attachment cavities, the ball cages extending to and angularly interlocking with the valve seats.

A double diaphragm pump comprising

• air chambers;
• pump chambers, each including an inlet and an outlet;
• diaphragms, the air chambers and the pump chambers mating together, respectively, to form pump cavities, the diaphragms extending across the pump cavities, respectively, between the air chambers and the pump chambers;
• flow connectors coupled with the pump chambers at the inlets and outlets, respectively, the flow connectors each including a valve cavity, the flow connectors and the pump chambers each further including mating annular bolting flanges with an equiangularly spaced bolting pattern;
• valves in the valve cavities, respectively;
• a pump stand including four legs, each leg having a mounting plate with a plurality of mounting holes matching the equiangular spacing of the bolting pattern.

A double diaphragm pump comprising

• air chambers;
• pump chambers, each including an inlet and an outlet;
• diaphragms, the air chambers and the pump chambers mating together, respectively, to form pump cavities, the diaphragms extending across the pump cavities, respectively, between the air chambers and the pump chambers;
• elbows coupled with the pump chambers at the inlets and the outlets, respectively, the elbows each including a valve cavity and an outlet port having a first cross-sectional area;
• ball valves in the valve cavities, respectively, each ball valve including a valve seat, a ball and a ball cage extending to and angularly interlocking with the valve seat, each of the elbows further including a threaded valve seat attachment cavity adjacent the valve cavity sized to threadably receive one of the valve seats, the outlets of the pump chambers each including a threaded valve seat attachment cavity sized to threadably receive one of the valve seats, the valve seats each including a threaded section and a radially extending annular shoulder adjacent the threaded section, the threaded sections threadably fitting within the threaded valve seat attachment cavities, the elbows adjacent the threaded valve seat attachment cavities and the pump chambers adjacent the threaded valve seat attachment cavities including radially outward sealing surfaces, the flow path through the pump cavities, the ball valves with the balls fully displaced from the valve seats, respectively, and the elbows having cross-sectional flow areas at least as large as the first cross-sectional area;
• compressible seals positionable between the radially extending annular shoulders and the radially outward sealing surfaces.