A liquid dispenser comprising a liquid pump. The liquid pump comprises a first liquid inlet configured to allow the introduction of a first liquid into a mixing chamber; a second liquid inlet configured to allow the introduction of a second liquid into the mixing chamber; an outlet valve configured to regulate the release of a mixed liquid from the mixing chamber, the mixed liquid being a blend of the first liquid and the second liquid; and a reciprocating member configured to effect a reciprocating movement along a longitudinal axis, the reciprocating member being configured to regulate the aperture of the outlet valve. The liquid dispenser comprises a piezoelectric detector arranged in such a way that when the liquid pump generates a shockwave, the shockwave is detected by the piezoelectric detector, the piezoelectric detector generating a voltage peak which is a function of the shockwave.

A liquid dispenser comprising a liquid pump. The liquid pump comprises a first liquid inlet configured to allow the introduction of a first liquid into a mixing chamber; a second liquid inlet configured to allow the introduction of a second liquid into the mixing chamber; an outlet valve configured to regulate the release of a mixed liquid from the mixing chamber, the mixed liquid being a blend of the first liquid and the second liquid; and a reciprocating member configured to effect a reciprocating movement along a longitudinal axis, the reciprocating member being configured to regulate the aperture of the outlet valve. The liquid dispenser comprises a piezoelectric detector arranged in such a way that when the liquid pump generates a shockwave, the shockwave is detected by the piezoelectric detector, the piezoelectric detector generating a voltage peak which is a function of the shockwave.

Mechanical refrigeration system includes a compression device. The compression device has a pair of dual-action cylinders connected together by a movable rod thereof. A first cylinder acts as an element for compressing coolant fluid, for which purpose the rod is moved through the second cylinder, fed by a pressurised fluid that allows the flow of coolant fluid in the first cylinder and the flow of pressurised fluid of the second cylinder at the outlet of both devices to be constant, thus configuring a completely autonomous device that does not need electricity or any type of fuel.

Mechanical refrigeration system includes a compression device. The compression device has a pair of dual-action cylinders connected together by a movable rod thereof. A first cylinder acts as an element for compressing coolant fluid, for which purpose the rod is moved through the second cylinder, fed by a pressurised fluid that allows the flow of coolant fluid in the first cylinder and the flow of pressurised fluid of the second cylinder at the outlet of both devices to be constant, thus configuring a completely autonomous device that does not need electricity or any type of fuel.

A rotary valve rotated by an arm connected to a piston being driven by the pressurized fluid, either water or air. The orientation of the valve body in the valve housing will direct the fluid in one of two directions to move the piston. The arm of the rotary valve is connected to a cam that rotates a shaft connected to the valve body. Two cam rollers are biased towards the outer surface of the rotating cam member. The cam rollers provide a force to the cam to aid in the changing of the orientation of the valve body. There are two bump outs on the cam that correlate to the end of the piston movement so that the rotary valve does not stop at an end point of the piston stroke. The rotary valve may be is utilized in a chemical dosing or chemical application device that is driven by pressurized fluid.

A hydraulically driven diaphragm pumping machine (pump), in particular for water and difficult-to-pump materials, comprises at least two side-by-side pumping units. Each pumping unit comprises a hydraulically-driven pump cylinder (1,2) and a separate non-pump hydraulic drive cylinder (9,10). The pump cylinder (1,2) has a lower first end with a first inlet and outlet for fluid to be pumped and an upper second end with a second inlet and outlet for hydraulic fluid. The pump cylinder (1,2) contains a bellows (3,4) closed at its lower end and open at its upper end for communication with hydraulic fluid. The outside of the bellows (3,4) defines a space for fluid to be pumped. The bellows (3,4) of the pump cylinder (1,2) is arranged to be driven by hydraulic fluid supplied at its top end, in concertina like expansion and contraction to pump the fluid to be pumped adjacent the lower first end of the pump cylinder (1,2). The hydraulic drive cylinder (9,10) is placed side-by-side the pump cylinder (1,2). The hydraulic drive cylinder (9,10) has a lower first end associated with a hydraulic drive an upper second end containing hydraulic fluid communicating with the upper second end of the pump cylinder (1,2). The hydraulic drive terminates at its upper end with a drive piston (19,20) slidably mounted in the hydraulic drive cylinder (9,10). The hydraulic drives of the hydraulic drive cylinders (9,10) of the two pumping units are connected by a hydro-mechanical connection (25,27) designed to control drive of the hydraulic fluid to advance and retract the pistons (19,20) of each hydraulic drive cylinder (9,10).

A hydraulically driven diaphragm pumping machine (pump), in particular for water and difficult-to-pump materials, comprises at least two side-by-side pumping units. Each pumping unit comprises a hydraulically-driven pump cylinder (1,2) and a separate non-pump hydraulic drive cylinder (9,10). The pump cylinder (1,2) has a lower first end with a first inlet and outlet for fluid to be pumped and an upper second end with a second inlet and outlet for hydraulic fluid. The pump cylinder (1,2) contains a bellows (3,4) closed at its lower end and open at its upper end for communication with hydraulic fluid. The outside of the bellows (3,4) defines a space for fluid to be pumped. The bellows (3,4) of the pump cylinder (1,2) is arranged to be driven by hydraulic fluid supplied at its top end, in concertina like expansion and contraction to pump the fluid to be pumped adjacent the lower first end of the pump cylinder (1,2). The hydraulic drive cylinder (9,10) is placed side-by-side the pump cylinder (1,2). The hydraulic drive cylinder (9,10) has a lower first end associated with a hydraulic drive an upper second end containing hydraulic fluid communicating with the upper second end of the pump cylinder (1,2). The hydraulic drive terminates at its upper end with a drive piston (19,20) slidably mounted in the hydraulic drive cylinder (9,10). The hydraulic drives of the hydraulic drive cylinders (9,10) of the two pumping units are connected by a hydro-mechanical connection (25,27) designed to control drive of the hydraulic fluid to advance and retract the pistons (19,20) of each hydraulic drive cylinder (9,10).

An ultrahigh pressure generator is disclosed. The ultrahigh pressure generator has a pressure intensifier that discharges a fluid at ultrahigh pressure. The pressure intensifier uses a working medium and includes a double acting drive cylinder with a first compartment and a second compartment that are separated by a piston. A closed-circuit working medium pump drives the pressure intensifier by sucking and discharging the working medium from and to the first and second compartments. A collector collects the working medium from the first and second working medium channels into a tank. A low-pressure selector selects whether the working medium is discharged from the first or second compartment when the pressure of the working medium discharged toward the first or second compartment exceeds a predetermined threshold, and directs the selected working medium to the collector. The pressure generator manages the temperature of the working fluid appropriately.

It is challenging to detect end of stroke for hydraulically actuated, reciprocating piston pumps for a variety of reasons. When the pump pressurizes a process fluid to a 10 relatively low pressure the magnitude of hydraulic fluid pressure is not as distinct compared to the magnitude of a pressure drop across a shuttle valve employed to detect end of stroke, which makes detecting the end of stroke event difficult. A method is disclosed for detecting end of a piston stroke in a hydraulic motor comprising a reciprocating piston with a shuttle valve. The method comprises 1 detecting end of piston stroke when a magnitude of a rate of change of hydraulic fluid pressure is substantially greater than a magnitude of a mean rate of change of hydraulic fluid pressure over said piston stroke; and noise in a hydraulic fluid pressure signal is substantially negligible.

It is challenging to detect end of stroke for hydraulically actuated, reciprocating piston pumps for a variety of reasons. When the pump pressurizes a process fluid to a 10 relatively low pressure the magnitude of hydraulic fluid pressure is not as distinct compared to the magnitude of a pressure drop across a shuttle valve employed to detect end of stroke, which makes detecting the end of stroke event difficult. A method is disclosed for detecting end of a piston stroke in a hydraulic motor comprising a reciprocating piston with a shuttle valve. The method comprises 1 detecting end of piston stroke when a magnitude of a rate of change of hydraulic fluid pressure is substantially greater than a magnitude of a mean rate of change of hydraulic fluid pressure over said piston stroke; and noise in a hydraulic fluid pressure signal is substantially negligible.