Abstract: A displacement pump includes a delivery chamber, connected to a pressure connection and a suction connection. A displacement element determines the volume of the delivery chamber and can be moved back and forth between a first position, in which the delivery chamber has a smaller volume, and a second position, in which the delivery chamber has a larger volume. The pressure connection is connected to the delivery chamber by a pressure valve and the suction connection is connected to the delivery chamber by a suction valve. The displacement pump is easy and economical to produce and simultaneously reliably provides a degassing function, whereby downtimes can be reduced and the reliability of the delivery process can be increased. With the pressure valve closed, a backflow channel connects the delivery chamber and pressure connection, through which medium can enter the delivery chamber and/or gas can escape from the delivery chamber.

Abstract: The present invention concerns a diaphragm pump comprising a delivery chamber separated from a hydraulic chamber by way of a diaphragm, wherein the delivery chamber is respectively connected to a suction connection and a pressure connection and the hydraulic chamber which can be filled with a working fluid can be acted upon with a pulsating working fluid pressure and the diaphragm can be reciprocated between a pressure position in which the volume of the delivery chamber is smaller and a suction position in which the volume of the delivery chamber is larger.

Abstract: A diaphragm pump includes a pumping chamber, suction and pressure connections, a working chamber filled with a hydraulic fluid, a device for applying an oscillating pressure P1 to the hydraulic fluid, and a diaphragm separating the pumping chamber and the working chamber moveable between a pressure stroke position and a suction stroke position. A storage chamber accommodates hydraulic fluid at a pressure P2. The storage chamber and the working chamber are connected to each other by a valve having a closing part. The diaphragm cannot move too far beyond the pressure stroke position. The diaphragm is coupled to the closing part so that the valve is opened when the diaphragm moves from the pressure stroke position to a position that is farther from the suction stroke position than the pressure stroke position.

Abstract: The present invention relates to a metering system for metering a liquid metering medium, with a suction line, which is filled with a metering medium at the liquid pressure ps, and a pressure line, which is filled with the metering medium at the liquid pressure wherein the suction line is connected to the pressure line by a metering member configured as a metering pump, with which metering medium can be conveyed from the suction line into the pressure line, wherein the metering pump has a conveying chamber, the volume of which can be changed with the aid of a movable displacement element in such a way that, in a first position of the displacement element, the conveying chamber has a minimum volume Vmin and, in a second position of the displacement element, the conveying chamber has a maximum volume Vmax, the conveying chamber being connected by a pressure valve to the pressure line and by a suction valve to the suction line, so, by an oscillating movement of the displacement element, metering medium can alter

Abstract: A pressure retention valve including a housing having an inlet passage and an outlet passage that can be connected together and a separating diaphragm subdividing the housing into two portions, wherein, in operation of the valve, a first portion conveys fluid and a second portion is fluid-free. The valve further includes a valve seat defining an end of the inlet passage, arranged in the fluid-conveying portion of the housing, and has a first sealing surface, a shut-off body which is arranged movably in the fluid-conveying portion of the housing and has a second sealing surface, and a spring element having a spring force, which is arranged in the fluid-free portion of the pressure retention valve.

Abstract: A diaphragm machine including a drive unit for producing pulsating hydraulic fluid flows for driving the diaphragms, and a delivery unit for delivering a delivery medium and having pump chambers with volumes that can be varied by the movement of a respective diaphragm. Each pump chamber is connected by a pressure valve to a pressure line and by a suction valve to a suction line. The delivery unit includes at least two hydraulic bodies and a diaphragm body in which the pressure and suction lines are arranged. Each hydraulic body is connected to the drive unit, and formed between each hydraulic body and the diaphragm body is a cavity in which one of the diaphragms is arranged so that by production of the pulsating hydraulic fluid flows, the diaphragms are moved within the cavities and the delivery medium is periodically transferred from the suction line into the pressure line.

Abstract: The present invention relates to a metering system for metering a liquid metering medium, with a suction line, which is filled with a metering medium at the liquid pressure ps, and a pressure line, which is filled with the metering medium at the liquid pressure wherein the suction line is connected to the pressure line by a metering member configured as a metering pump, with which metering medium can be conveyed from the suction line into the pressure line, wherein the metering pump has a conveying chamber, the volume of which can be changed with the aid of a movable displacement element in such a way that, in a first position of the displacement element, the conveying chamber has a minimum volume Vmin and, in a second position of the displacement element, the conveying chamber has a maximum volume Vmax, the conveying chamber being connected by a pressure valve to the pressure line and by a suction valve to the suction line, so, by an oscillating movement of the displacement element, metering medium can alter