Abstract: A valve assembly for a diaphragm pump reduces leakage while providing good flow-through by including shaping of the seat and/or the valve that increases the elastic tension between the valve and seat in outer regions of the valve assembly, thereby providing a more optimal tension over the entire valve. In embodiments, outer regions of the seat are more steeply sloped upward than inner regions while the valve is substantially uniform in slope. In other embodiments, valve outer regions are less steeply sloped upward, or more steeply sloped downward, than its inner regions, and the seat is substantially uniform in slope. A vertical cross section of the seat and/or valve can include continuous curvature and/or discrete changes in linear slope. In some embodiments, two linear slopes are included in the vertical cross section of the seat or valve. The pump can be a multi-chamber pump.

Abstract: A diaphragm pump includes a bypass valve and spring that are easy to install and do not require support by a special plug or mounting bracket. The pump outlet is perpendicular to the input, causing the bypass valve and spring to operate laterally as seen from the pump base. When installed, the bypass spring is suspended between the bypass valve and a simple “T” insert that is held in place within the pump by interior elements of the pump, without need for a special plug or bracket. The longitudinal strength of the housing is increased by providing a cone-shaped outer wall having a scalloped inner surface. The conical shape enhances the housing's resistance to longitudinal forces applied to the diaphragm. The cusps of the scalloped shape provide wall support ribs and locations for assembly screws, while increasing the interior volume and reducing the pump weight.

Abstract: A valve assembly for a diaphragm pump reduces leakage while providing good flow-through by including shaping of the seat and/or the valve that increases the elastic tension between the valve and seat in outer regions of the valve assembly, thereby providing a more optimal tension over the entire valve. In embodiments, outer regions of the seat are more steeply sloped upward than inner regions while the valve is substantially uniform in slope. In other embodiments, valve outer regions are less steeply sloped upward, or more steeply sloped downward, than its inner regions, and the seat is substantially uniform in slope. A vertical cross section of the seat and/or valve can include continuous curvature and/or discrete changes in linear slope. In some embodiments, two linear slopes are included in the vertical cross section of the seat or valve. The pump can be a multi-chamber pump.

Abstract: A diaphragm pump includes a bypass valve and spring that are easy to install and do not require support by a special plug or mounting bracket. The pump outlet is perpendicular to the input, causing the bypass valve and spring to operate laterally as seen from the pump base. When installed, the bypass spring is suspended between the bypass valve and a simple “T” insert that is held in place within the pump by interior elements of the pump, without need for a special plug or bracket. The longitudinal strength of the housing is increased by providing a cone-shaped outer wall having a scalloped inner surface. The conical shape enhances the housing's resistance to longitudinal forces applied to the diaphragm. The cusps of the scalloped shape provide wall support ribs and locations for assembly screws, while increasing the interior volume and reducing the pump weight.