A central flow double diaphragm pump using as an energy source, a pressurized operating fluid flows through the central part, and including two external lateral chambers (1,2), each chamber including a diaphragm separating an outer operating fluid chamber (1.1, 2.1) from an inner pumped fluid chamber (1.2, 2.2), 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, and two 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, and the 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, and a 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 (8.5); an inlet sealing cylinder with a circular sealing lip (8.1) 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 and a protrusion (8.2) with a truncated spherical surface being supported by, pivoting against and sealing against a low friction seal (8.3) housed in the center of the operating fluid distribution module, and two 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, and a flange sealing bead preventing pumped fluid and operating fluid leaking between the chamber covers and the central pump body.