Abstract: A booster pump and a water purification device. The booster pump comprises: a pump body having an installation chamber extending in a first direction; a motor disposed in the installation chamber, the motor comprising a motor body and a motor shaft passing through two ends of the motor body in the first direction; and a first pump head and a second pump head respectively installed at two ends of the pump body in the first direction, two ends of the motor shaft being drivingly connected to the first pump head and the second pump head, respectively.

Abstract: At least one pressure exchange unit with a hollow cylindrical body, a piston sliding in the body, the piston including a piston head separating the interior of the cylindrical body into a downstream chamber and an upstream chamber, the downstream chamber being provided with a device for the admission and discharge of water to be treated, the upstream chamber being provided with a five-way distributor linkage including, for hydraulic balancing, two pressurized liquid supply orifices, two orifices for the evacuation of the liquid and an opening in communication with the upstream chamber.

Abstract: A pump is disclosed, having a pumping chamber in the rotor. The rotor is rotatable between first, second, third and fourth positions. When the rotor is in the first position, an inlet cam assembly displaces a piston to draw fluid into the pumping chamber via a first housing inlet. When the rotor is in the second position, an outlet cam assembly displaces the piston to expel fluid out of the pumping chamber via a first housing outlet. When the rotor is in the third position, the inlet cam lobe assembly displaces the piston to draw fluid into the pumping chamber via a second housing inlet. When the rotor is in the fourth position, the outlet cam assembly displaces the piston to expel fluid out of the pumping chamber via a second housing outlet. A method of pumping fluid is also disclosed.

Abstract: The engageable structure of the operation rod in the pump includes a valve member having an outer sleeve as an outer valve, an inner sleeve as an inner valve installing in the outer sleeve rotatably and a pushing operation body with a sliding part installed in the inner sleeve and with a driven operation rod; a drive source; and a driving operation rod moves horizontally due to guiding by a supporting member arid force of the drive source, and a catching part of the valve member engages with a connection-supporting device which is attached to the driving operation rod when the driven operation rod of the valve member and driving operation rod of the drive source are connected.

Abstract: A cruciform pump comprises a casing, a positioning round disk in the casing; a driven rotary disk; and two sliding blocks. A center of the positioning round disk is arranged corresponding to a center of the casing, and has a cruciform sliding groove. The driven rotary disk is eccentrically installed on the positioning round disk. One rotary shaft at one surface of the rotary disk protrudes out of the casing. The two sliding blocks are installed in the cruciform sliding groove. Each block is conformed to the sliding groove, so that the positioning round disk is driven by the sliding blocks. When the driven rotary disk rotates through two circles, the positioning round disk only rotates through one circle. During rotation, the two sliding blocks move along the cruciform sliding groove; then, one side of the sliding block presses fluid flowing out, and another side thereof will suck fluid into the sliding groove.

Abstract: This invention relates to a continuously operable hydraulic device usable as either a hydraulic pump or a hydraulic motor, including a plurality of unit hydraulic devices each having a pair of plungers. Operational association between these unit hydraulic devices makes it possible to discharge fluid at an accurate flow rate continuously or by a predetermined value, or to supply the fluid to rotate a driven component. Four pairs of plungers 51 and 56 are inserted into a port block 20 having a sucking port 25 and a discharge port 26 with the end faces thereof being opposed to each other. These plungers 51 and 56 are moved along a pair of cam surfaces 68A and 68B of a cam 68 by cam followers 69 and 70 which are connected to the plungers 51 and 56 via plunger driving shafts 73 and 75. These pairs of plungers 51, 56, the cam followers 69, 70 and the like constitute the unit hydraulic device 95.

Abstract: The device permits dosing a secondary fluid in a principal fluid and comprises a body (1) in which is provided a passageway (20) for the circulation of the principal fluid and having an inlet orifice (22) and distribution orifices (23) for the fluid, which distribution orifices open onto a cylindrical chamber (3) defined by a housing (2), the chamber (3) containing means (39, 16, 19, 27, 28, 30) for driving a pump (36) of the secondary fluid which comprise three pistons (30) mounted on radial rods (16) pivotally mounted on an arm (15) of a crank (39) adapted to drive in alternating translation a dosing piston (35) of the pump (36). Each piston (30) is slidable in a cylinder (28) pivotally mounted on a pin (40). This measuring-dosing device delivers additive in proportion to the rate of flow of the principal fluid in synchronism with the crank (39) and without the use of any spring.

Abstract: A tubular cylinder block is mounted for rotation about its axis within a cylindrical bore of a pump housing. The pump housing has circumferentially spaced inlet and outlet ports opening radially to the bore. Right angle intersecting diametric passages extend through the cylinder block and are alignable with the inlet and outlet ports during rotation of the drive block, the diametric passages being square in cross-section, and piston members of corresponding square transverse cross-section are slidably positioned within respective diametric passages with the piston members bearing square slots within side faces thereof intermediate of their ends facing axially. A square drive block is carried commonly within the piston member slot whose axis of rotation is adjusted eccentrically relative to the axis of rotation of the cylinder block. Cylinder block internal peripheral grooves separated by lands control fluid passage via the piston formed cavities between the inlet and outlet ports.

Abstract: A two-stroke piston pump includes an external piston cylinder seal by providing a flexible sidewall portion of the cylinder and an elastic O-ring sized to squeeze the flexible sidewall against the surface of the piston. The piston and piston cylinder are constructed of self-lubricating materials. The cylinder block is connected to a base plate which has inlet and outlet ports and as the piston reciprocates in the piston chamber, a single port communicating with the piston chamber shifts between the intake and exhaust ports to provide the pumping action.

Abstract: A positive displacement machine has a housing bounding an elongated interior compartment, a flat displaceable part-circular element in said compartment subdividing the latter into a pressure chamber and a suction chamber and having a recess in a periphery thereof bounded by two edges which are spaced circumferentially of the periphery, and drive elements for imparting to the displaceable element a translatory displacement and for superposing on the translatory displacement an angular movement such that during displacement of the element between two opposite dead center positions, the pressure and suction chambers are temporarily placed in communication by the recess of the displaceable element so as to permit displacement of a fluid from one to the other chamber. The displaceable element has a periphery exceeding over more than 180.degree. of arc and a diameter corresponding to the width of the interior compartment of the housing in a direction transverse to the elongation of the compartment.

Abstract: Apparatus for reverse osmosis purification of water or other fluid by passing the fluid under pressure across a membrane, through which membrane a part of the fluid passes in purified form, makes use of a piston or diaphragm pump in which the front face of the piston or diaphragm is used to force the fluid from one end of a cylinder into the module and in which the return fluid is applied to the rear face of the piston or diaphragm so that the pressures on the two faces are substantially balanced. The piston or diaphragm is operated by a piston rod attached to the rear face of the piston or diaphragm; the system is self-regulating to give an extraction ratio equal to the ratio of piston rod area to piston area.

Abstract: The present invention comprises a fluid pump motor unit and a controller unit which controls the output of the pump/motor irrespective of the speed of the power source driving the pump/motor unit.The pump/motor unit comprises a cylindrical housing within which there is arranged at least one rectangular expansible cylinder assembly mounted on a crankshaft in a radial pattern, the cylindrical assembly being pivotally mounted within the housing for movement about trunnions, the rectangularly adapted piston assembly within said housing being journaled on a crankshaft which crankshaft with respect to the centerline of the cylindrical housing has a rotation parallel to, but spaced from, the centerline of the housing. The pivotal oscillation of each cylinder assembly alternately opens a port for the inflow of a fluid and subsequently closes that port while simultaneously opening another port for the outward flow of the fluid under compression as the piston moves toward the top of the chambers.

Abstract: A radial piston pump wherein the crank pin of a crankshaft engages with arcuate shoes at inner ends of radially extending pistons which are reciprocable in discrete cylinders. The outer end of each cylinder normally bears against the convex sealing surface of a discrete back support having in the sealing surface a pressure port for evacuation of pressurized fluid in response to outward movement of the respective piston. The cylinders are caused to move their outer ends away from full engagement with the respective sealing surfaces in response to inward movements of the respective pistons so that the chambers of the cylinders can draw fluid from the interior of the pump housing. The cylinders are caused to move substantially radially and away from the respective sealing surfaces due to frictional engagement between their internal surfaces and the external surfaces of the respective pistons.