A volume control actuator including a non-contact cylinder. An installation frame has a predetermined height and size. First and second installation spaces are defined in upper and lower portions of the installation frame, respectively. A pressing unit is vertically disposed on top of the installation frame to move a reciprocating rod in the first installation space reciprocating stroke movements. A fluid pipe is provided in the second installation space and connected to an installation plate to obtain a path through which fluid flows. Both ends of a rubber cylinder are fixed to a top surface of the installation plate and one end of the reciprocating rod. The rubber cylinder is provided in the first installation space so that the volume of the rubber cylinder changes in an expanding and contracting manner in response to the stroking of the reciprocating rod, thereby causing fluid in the fluid pipe to flow.

A reciprocating fluid pump includes a pump body, a first subject fluid chamber, a second subject fluid chamber, a first plunger at least partially defining a first drive fluid chamber and including a flexible material and configured to expand and compress in a reciprocating action to pump the subject fluid through the first subject fluid chamber within the pump body, and a second plunger located within the pump body and at least partially defining a second drive fluid chamber and including a flexible material and configured to expand and compress in a reciprocating action to pump the subject fluid through the second subject fluid chamber within the pump body, wherein the first plunger is not structurally coupled to the second plunger, such that the first plunger and the second plunger are independently movable during operation.

A bellows pump device includes a control unit which, before operation of the bellows pump device is started, performs initial control in which solenoid valves are switched and pressurized air is supplied to suction-side air chambers in advance, thereby determining operation air pressures which are air pressures of the pressurized air to be supplied to the suction-side air chambers during the operation. As the initial control, the control unit outputs control commands to electropneumatic regulators so as to gradually increase the air pressures of the pressurized air to be supplied to the suction-side air chambers in advance, and when detection signals resulting from detection of expansion positions of the bellows are inputted from the proximity sensors to the control unit, the control unit determines the air pressures of the pressurized air supplied to the suction-side air chambers at that time as the operation air pressures.

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).

The present disclosure relates to methodologies, systems, and devices for compressing CO.sub.2 for recycling within a CO.sub.2-based chromatography or extraction system. A bellows pump can receive CO.sub.2 in a gaseous state and can compress the CO.sub.2 into a liquid or partially liquid-vapor state using hydraulic compression. Once compressed, the liquid or liquid-vapor CO.sub.2 can be recycled within the CO.sub.2-based chromatography or extraction system.

An electrochemically actuated pump and an electrochemical actuator for use with a pump. The pump includes one of various stroke volume multiplier configuration with the pressure of a pumping fluid assisting actuation of a driving fluid bellows. The electrochemical actuator has at least one electrode fluidically coupled to the driving fluid chamber of the first pump housing and at least one electrode fluidically coupled to the driving fluid chamber of the second pump housing. Accordingly, the electrochemical actuator selectively pressurized hydrogen gas within a driving fluid chamber.

Provided is a bellows pump device that is able to reduce fall of a discharge pressure of a transport fluid during contraction operation of a bellows. The bellows pump device supplies pressurized air to a hermetic discharge-side air chamber thereby to cause a bellows disposed within the discharge-side air chamber to perform contraction operation to discharge a transport fluid, and discharges the pressurized air from the discharge-side air chamber thereby to cause the bellows to perform expansion operation to suck the transport fluid. The bellows pump device includes an electropneumatic regulator configured to adjust an air pressure of the pressurized air to be supplied to the discharge-side air chamber, such that the air pressure is increased so as to correspond to a contraction characteristic of the bellows during the contraction operation of the bellows.

In order to make the two pump units which are generally present in an emptying device for a storage container and which feed in alternating fashion as compact as possible on the one hand and subject to as little wear as possible on the other hand, both pump units are preferably equipped with a feed pump in the form of a diaphragm pump, which is driven by a hydraulically operated working cylinder unit.

In order to make the two pump units which are generally present in an emptying device for a storage container and which feed in alternating fashion as compact as possible on the one hand and subject to as little wear as possible on the other hand, both pump units are preferably equipped with a feed pump in the form of a diaphragm pump, which is driven by a hydraulically operated working cylinder unit.

Conveying device, in particular in the form of a compressor, consisting of at least one housing (10) and a partition element which is arranged movably in the housing (10) and separates two fluid regions (14, 16) in the housing (10) from each other, wherein the partition element is formed of a partition bellows (18) with individual bellows folds (20), wherein a mechanical actuation device for controlling a movement of the partition bellows (18) is provided, and wherein the heat generated by means of the actuation device via the movement of the partition bellows (18) can be at least partially removed from the housing (10) by means of a cooling device.