A repeater system may control a pump by using a repeater and a user interface. An adhesive patch system may be used for affixing a pump or other object to a human body. Such an adhesive patch system may include two sets of adhesive members, each member including an adhesive material on at least one side so as to attach to the body. The members of the first set are spaced to allow the members of the second set to attach to the body in spaces provided between the members of the first set, and the members of the second set are spaced to allow members of the first set to detach from the body without detaching the members of the second set. Also, fill stations and base stations are provided for personal pump systems.

Idling a hydraulic machine includes electronically controlled high and low-pressure valves, a control system arranged to control opening and closing of said valves, a first idle safety valve arrangement arranged between the first working chamber and a fluid sink with a pressure equal to or lower than the high pressure, operating the hydraulic machine in an empty cylinder idle mode, wherein the high and low-pressure valves are concurrently closed for at least a whole cycle of the varying volume, and releasing hydraulic fluid to the fluid sink only when fluid pressure in the working chamber increases above a set threshold and the empty cylinder mode is enabled, enabling the first idle safety valve arrangement when the hydraulic machine operates in the empty cylinder idle mode, and disabling when not.

The invention comprises a method and apparatus for: (1) alternatingly in time inflating and deflating a sealed compartment that includes: a first flexible and deformable seal connected to a pressure control chamber; (2) alternatingly in time pumping a gas into a first chamber and a second chamber separated by a first piston in a first partially sealed cylinder of a double acting kinematic cylinder, the double acting kinematic cylinder further comprising a second partially sealed cylinder, including: a second piston and the pressure control chamber, the pressure control chamber both on a first side of the second piston and within the second partially sealed cylinder; and (3) transferring a force from the first piston to the second piston via a rigid coupler affixed at a first end to the first piston and at a second end to the second piston, such as to alternating inflate and deflate a seal.

A centrifugal compressor for HVAC application includes a rotary component rotatable about an axis, a static component, and a brush seal fixed to one of the static component and the rotary component. The brush seal includes bristles that contact the other of the static component and the rotary component.

A printing method forms a continuous strand of building material for 3D printing of a structural part via a printing system. The printing system has a printing apparatus that dispenses building material out of the printing apparatus and shapes building material to form a strand of building material, and a discontinuous building material pump that discontinuously conveys building material for discontinuously dispensing conveyed building material out of the printing apparatus. The printing method includes the steps of: a) discontinuously conveying building material via the discontinuous building material pump and discontinuously dispensing conveyed building material out of the printing apparatus and shaping conveyed building material via the printing apparatus, and b) discontinuously moving the printing apparatus during the discontinuous conveying and the discontinuous dispensing such that the dispensed and shaped building material forms a continuous strand of building material.

A hydraulic fracturing system can include valve apparatuses that control the delivery of fluid to high-pressure pumps that supply the fluid to a wellhead. The valve apparatuses can receive electronic signals from a control system to regulate the flow rate of the fluid to the high-pressure pumps. In one or more examples, the flow rate of the fluid can be controlled such that proppant in the fluid remains in solution.

The disclosure relates to a position detection device for determining the position of the diaphragm or the drive piston of an electric-motor-driven diaphragm pump, in particular detecting the upper and lower reversal point (Po, Pu) in the movement curve of the diaphragm of a diaphragm pump operated in an electric-motor-driven manner via eccentric means, wherein a diaphragm actuated by a drive connecting rod closes a conveying chamber with valve means provided on an inlet and outlet side such that the volume can be changed between a minimum and maximum volume, whereby a reciprocating movement of an electric motor having a rotor attached to a shaft is converted into an actuation movement of the drive connecting rod via the effect of the eccentric means, wherein the position detection device has detecting means for detecting the average value position of the rotor shaft, as well as an evaluation device in order to determine at least the position of the upper reversal point of the diaphragm from the average value position.

A disposable medical flow-regulating assembly includes flow-directing units, with multiple fluid-flow lines entering each of the flow-directing units. The flow-directing units are interconnected by a fluid-flow line that extends between them. Each of the flow-directing units includes a rotational insert member that regulates which of multiple flow passages through the flow-directing unit is open and which are closed, based on the angular position of the insert member.

Various embodiments include methods for operating a high-pressure pump comprising: driving a piston arranged in a compression chamber with a motor shaft; during movement of the piston toward the top dead center, closing the inlet valve so the fluid is then delivered by the piston through an outlet valve; applying a coil current to an electromagnet used to close the inlet valve during and/or after overshooting the top dead center; detecting a start time at which the coil current, on account of starting of an opening movement of the inlet valve, fulfills a predetermined change criterion; labelling a dead center rotation position of the motor shaft at which the piston is at the top dead center based at least in part on the ascertained start time; and adjusting operation of the pump based on the identified dead center rotation position.

A low-force, non-displacement, micro/miniature valve and/or pump assembly is provided. A tube component having a first side port coupled to an inlet portion and a second side port coupled to an outlet portion can be selectively moved to alternatively couple the side ports to a first or second piston pump chamber. First and second pistons can be actuated after positioning the tube component to either draw in fluid or push out fluid from either the first or second piston pump chambers during each actuation of the pistons. The fluid can be drawn in from a reservoir and can be expelled to a patient for providing a dose of the fluid to the patient.