A central flow double diaphragm pump controlled by an operating fluid distribution module with a pivoting sealing member and protruding wing, that pivots on a low friction seal. The pump also includes a central pump body having an inlet and discharge manifolds, and two pumped fluid chambers in the c
A central flow double diaphragm pump controlled by an operating fluid distribution module with a pivoting sealing member and protruding wing, that pivots on a low friction seal. The pump also includes a central pump body having an inlet and discharge manifolds, and two pumped fluid chambers in the central pump body each including a pumped fluid chamber inlet port and outlet port; within each chamber the inlet port is positioned higher than the outlet port. Two suction check valves are located in the central body, close to the suction inlet, above the pump's shaft, and these valves' outlets connect directly to the pumped fluid chamber inlet ports. Two discharge check valves are located in the central pump body, close to the discharge outlet and below the shaft, and the pumped fluid chamber outlet ports connect directly to these valves' inlets. Removable access caps are included above the check valves.
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1. A central flow double diaphragm pump using as an energy source, a pressurized operating fluid, and including two external lateral chambers, each chamber including a diaphragm separating an outer operating fluid chamber from an inner pumped fluid chamber, the pump comprising: a central pump body c
1. A central flow double diaphragm pump using as an energy source, a pressurized operating fluid, and including two external lateral chambers, each chamber including a diaphragm separating an outer operating fluid chamber from an inner pumped fluid chamber, the pump comprising: a central pump body comprising: two concave sides each delimiting an inner side of the respective pumped fluid chambers;an inlet manifold, as an integral part of the central pump body, for introducing fluid to the pump;an outlet manifold, as an integral part of the central pump body, for discharging fluid from the pump;a shaft, within a bushing, running between the centers of the central pump body's concave sides;two pumped fluid inlet ports and two pumped fluid outlet ports one of each within each of the two pumped fluid chambers, the inlet ports being at a different height than the outlet ports, the inlet ports being above the inlet manifold and the outlet ports being below the outlet manifold;two suction check valve housings between the pumped fluid chambers, each including a suction check valve, the suction check valves being above the shaft, and with the inlet manifold being connected to the inlet of each suction check valve housing and with an immediate connection from the outlet of each suction check valve housing to the respective pumped fluid inlet port, andtwo discharge check valve housings between the pumped fluid chambers, each including a discharge check valve, the discharge check valves being below the shaft, and with an immediate connection from each pumped fluid outlet port to the inlet of the respective discharge check valve housing and with the outlet of each of the discharge check valve housings being connected to the outlet manifold;two check valve access caps the valves being independent of: the connections between the inlet manifold and the suction check valve housings and the connections between the discharge check valve housings and the outlet manifold, andthe connections between the pumped fluid inlet ports and the suction check valve housings and the connections between the suction check valve housings and the pumped fluid outlet ports;two chamber covers each delimiting an outer side of the respective operating fluid chambers and each fastened to the central pump body independently of the other chamber cover, independently of the inlet manifold and independently of the outlet manifold, wherein each chamber cover comprises: an operating fluid manifold communicating the operating fluid between an operating fluid distribution module and the respective operating fluid chamber;a throttle valve disposed in an inlet, the inlet guiding flow into one of the operating fluid manifolds from the fluid distribution module, anda sensor valve configured to detect an end of stroke position of the respective diaphragm when it reaches its outermost position and to send at the end of stroke an operating fluid impulse to the distribution module via the respective operating fluid manifold;the operating fluid distribution module being disposed above the central pump body, connected to both of the chamber covers, and including a pivoting sealing member, the pivoting sealing member rotating, in a horizontal plane, alternatively in a clockwise and anticlockwise direction, at a location of a flow of operating fluid into the operating fluid distribution module, and the pivoting sealing member comprising; a protruding wing;an inlet sealing cylinder with a circular sealing lip on each of the two circular sides of the cylinder configured to control the communication of the operating fluid between the operating fluid distribution module and alternatively, via the respective chamber cover operating fluid manifolds, each of the operating fluid chambers anda protrusion with a truncated spherical surface being supported by, pivoting against and sealing against a low friction seal housed in the center of the operating fluid distribution module, andtwo diaphragms each comprising: an undulating profile that fits the profile of the chamber covers as the diaphragms are completing a suction stroke towards the chamber covers, and that fits the concave sides of the central pump body as the diaphragms are completing a discharge stroke towards the central pump body, anda flange sealing bead preventing pumped fluid and operating fluid leaking between the chamber covers and the central pump body. 2. The pump of claim 1, wherein the operating fluid distribution module comprises: an operating fluid inlet cavity comprising two operating fluid inlet ports one on either side of the operating fluid inlet cavity, andan operating fluid outlet cavity comprising two operating fluid outlet ports on either side of the operating fluid outlet cavity, andwherein the pivoting sealing member of the operating fluid distribution module is a low friction pivoting sealing member, wherein the protruding wing of the pivoting sealing member includes a tip facing the flow of the operating fluid into the operating fluid inlet cavity, the tip having a chamfer on one long side of a rectangular section thereof facing the flow of operating fluid such that when operating fluid flows into the operating fluid inlet cavity the pivoting sealing member is not balanced in a central position within the operating fluid distribution module;wherein the sealing lip on each circular side of the inlet sealing cylinder of the pivoting sealing member is configured to permit the passage of operating fluid into one of the operating fluid inlet ports whilst sealing closed the other inlet port;wherein the protrusion of the pivoting sealing member seals against the low friction seal located in the center of the operating fluid distribution module such that the operating fluid is prevented from flowing directly from the operating fluid inlet cavity into the operating fluid outlet cavity, andwherein the pivoting sealing member further comprises an outlet sealing cylinder with a sealing lip on each circular side of the outlet sealing cylinder configured to permit the passage of operating fluid out of one of the operating fluid outlet ports whilst sealing closed the other outlet port. 3. The pump of claim 1, wherein the sensor valve comprises: a sensor chassis;a gasket;an actuating button;a ball valve seat;an o-ring seal, anda ball valve, andone of the chamber covers includes a throttle valve in one channel of its operating fluid manifold leading from the corresponding operating fluid inlet port of the operating fluid distribution module to the corresponding operating fluid chamberwherein the operating fluid distribution module, the chamber cover operating fluid manifolds and the sensor valves are configured to allow the pressurized operating fluid to act constantly on the sensor valves;each sensor valve is configured to open when the diaphragm on the same side of the pump as the sensor valve reaches its end of stroke towards the sensor valve;each sensor valve, and the chamber cover operating fluid manifold in the chamber cover including the sensor valve, and the operating fluid distribution module, are configured to allow the operating fluid to flow, when the sensor valve is opened, from the sensor valve, through the chamber cover operating fluid manifold, and to the operating fluid distribution module to apply an impulse force to the side of the inlet sealing cylinder on the same side of the pump as the sensor valve, to cause the pivoting sealing member to change position; andthe throttle valve is configured to reinforce the functioning of the pivoting sealing member by breaking a symmetrical functioning of the pump and so prevent the pivoting sealing member and hence the pump from stopping or stalling. 4. The pump of claim 1, wherein the two suction check valve housings and the two discharge check valve housings include housing openings in the upper ends of the check valve housings and one removable access cap closes and seals the two suction check valve housing openings and a second removable access cap closes and seals the two discharge check valve housing openings. 5. The pump of claim 1, wherein within each pumped fluid chamber the pumped fluid chamber inlet port is above the shaft towards the upper periphery of the fluid chamber, and the outlet port is below the shaft outlet manifold and towards the lower periphery of the fluid chamber and the inlet port and outlet port are diagonally opposite from one another to ensure a fluid flow from the top towards the bottom and out of the chambers, thus eliminating zones of zero and very low flow velocity where sedimentation could otherwise occur in the pumped fluid chambers. 6. The pump of claim 1, wherein the housings of the four check valves form, in the case of the suction valves, the pumped fluid chamber inlet ports located above the shaft and form, in the case of the discharge valves, the pumped fluid chamber outlet ports located below the shaft, so eliminating the need for manifolds between the check valves and the pumped fluid chamber inlet and outlet ports. 7. The pump of claim 1, wherein the two suction check valve housings and the two discharge check valve housings comprise housing openings in the upper ends of the check valve housings;one removable access cap closes and seals the two suction check valve housing openings and a second removable access cap closes and seals the two discharge check valve housing openings, andthe access caps are independent of the connections between the inlet and outlet manifolds and the check valve housings and are independent of the connections between the pumped fluid inlet and outlet ports and the check valve housings, to permit access to the check valve housings and the check valves without disconnecting either the inlet or the outlet manifold from hoses or pipes connecting to the pump and without disassembling either the inlet or the outlet manifold from the pump. 8. The pump of claim 1, comprising two independent suction inlets, one suction inlet connecting to each of the two pumped fluid chambers. 9. The pump of claim 1, wherein the diaphragms are elastic diaphragms and are not fastened to the shaft and wherein each diaphragm is configured such that the diaphragm is in a relaxed state at the end of a suction stroke and the diaphragm stores elastic energy during its deformation during a discharge stroke and the diaphragm assists a suction stroke by returning the elastic energy during the suction stroke. 10. The pump of claim 1, wherein the chamber covers, are independent of the inlet and outlet manifolds. 11. The pump of claim 1, wherein an automatic external controller controls the pump and/or comprising an integrated controller controlling the pump.
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