Abstract: A partially preloaded diaphragm having an outer attachment portion defining a first plane (P) and disposed about an axis substantially perpendicular to the first plane. An inner attachment portion is disposed substantially perpendicular to the axis of the outer attachment portion and defines a second plane (C). The inner attachment portion is movable away from the outer attachment portion into a fully extended pumping position defining a third plane (F). The first plane and the second plane are spaced at a distance to define a preload distance (PC) when the diaphragm is at rest, and the first and third plane are spaced to define a pump stroke distance (PF) when the diaphragm is fully extended. The preload distance is from about 25 percent to about 85 percent of the pump stroke distance.

Abstract: A muffler for use with a pneumatic motor the muffler including a housing having a first longitudinal wall, a second longitudinal wall, a first lateral wall, a second lateral wall, and a front wall where the first and second longitudinal walls include an exhaust port and the front, longitudinal and lateral walls define a muffler chamber. The muffler also includes first and second baffle located in said muffler chamber. The first and second baffles include a first side and a second side, and each baffle extends away from a first lateral wall substantially parallel to the longitudinal walls and terminates in a baffle edge. The first and second baffles dividing the muffler chamber into at least two exhaust chambers, the baffle edges define a crossover opening for flowing an exhausted fluid to an adjacent exhaust chamber. A sound absorbing media along said first and second sides of said first and second baffles.

Abstract: A diaphragm pump including a pump housing having a first housing side and a second housing side; a first unitary manifold flow connected to the first housing side; a second unitary manifold flow connected to the second housing side. The first and second unitary manifolds are adapted to be flow connected to either the first or second housing sides. The diaphragm pump also includes a pump inlet manifold and a pump discharge manifold. The pump inlet and discharge manifolds each have a first end, a second end, a first flow port at one of the ends and a second flow port located along the manifold between the two manifold ends. Both of said manifolds are adapted to be flow connected to the first and second unitary manifolds.

Abstract: The design of an air operated double diaphragm pump provides improved assembly, mounting flexibility, multiple plumbing combination including check valves which allow the pump to be mounted in any position without effecting its ability to prime or pump. A two shell housing design provides an enclosure for the air motor and includes structural ribbing, internal baffling, and all connections are made on the end of the pump in line with the diaphragm centerline allowing the pump to be installed in any access in line with the plumbing system.

Abstract: A reversible check valve cartridge wherein a sealing disk is urged to the shutoff position by means of a cage mounted umbrella spoke-like spring which is secured to the cage and is fully recessable therein so as to permit full travel of the sealing disk within the cage, thereby permitting increased flow for a given thickness of the valve cartridge.