Abstract: A valve unit includes a valve housing having an input line and an output line or the process pressure as well as a process guide shaft, an operating piston for closing and opening a connection between the two lines, two control lines and two control chambers for controlling the operating piston. The operating piston has a closing ring which in the closed state of the connection sealingly abuts a valve seat of the valve housing and it has a diameter which corresponds to a guide diameter of a dynamic process seal. The valve seat includes a softer and more elastic material than the sealing edge. The valve unit has low axial forces, due to low sealing forces, thus makes a long service life with a high number of cycles of operation possible.

Abstract: A gas injector has an injector lance, a drive unit, a push rod and a valve. The injector lance has a free end for injecting gas into an external unit. The drive unit generates a linear movement of the push rod, as a result of which the push rod actuates the valve and exposes a valve through-passage opening, in order for the gas to be injected. The valve through-passage opening is arranged in the region of the free end of the injector lance ). The gas injector can be designed to be relatively small and narrow. It minimizes switching delays, avoids dead spaces and prevents contamination of the valve.

Abstract: A valve has a valve housing in which a closure element having at least one sleeve section is movable along its sleeve longitudinal axis by an actuator to open and close a fluid connection between a fluid inlet and outlet. The actuator has stationary and movable parts relative to the valve housing. At least the movable parts and the closure element are arranged entirely within an enclosed fluid space between the fluid inlet and outlet. To close the fluid connection spaced first and second seal devices of a double-sealed seat are in sealing contact with equally-spaced first and second counter-seal devices on the valve housing along first and second closed seating lines, respectively. With regard to the at least one double-seal seat, the ratio between first and second areas enclosed by first and second sealing lines in projection along the sleeve longitudinal axis, respectively, is between 6/10 and 10/6.

Abstract: A valve has a valve housing in which a closure element having at least one sleeve section is movable along its sleeve longitudinal axis by an actuator to open and close a fluid connection between a fluid inlet and outlet. The actuator has stationary and movable parts relative to the valve housing. At least the movable parts and the closure element are arranged entirely within an enclosed fluid space between the fluid inlet and outlet. To close the fluid connection spaced first and second seal devices of a double-sealed seat are in sealing contact with equally-spaced first and second counter-seal devices on the valve housing along first and second closed seating lines, respectively. With regard to the at least one double-seal seat, the ratio between first and second areas enclosed by first and second sealing lines in projection along the sleeve longitudinal axis, respectively, is between 6/10 and 10/6.

Abstract: The present invention relates to a device for controlling blowing mediums in a stretch blow moulding machine for producing hollow bodies of heated preforms, wherein the device comprises a housing block with a first through-bore for accommodating at least one blow nozzle. In addition, a first and a second valve are provided, wherein these valves are in fluid communication with the first through-bore and configured for selectively connecting a blow nozzle accommodated in the through-bore to a fluid connection. In order to simplify the construction of the device and to prevent leakages, the housing block furthermore comprises first and second valve channels for accommodating the first and the second valve within the housing block, wherein the first and second valve channels are in fluid communication with the first through-bore.

Abstract: The invention relates to a device (10) for blow molding a container from a parison, comprising a blowing cylinder (11) and a blowing nozzle (12) mounted thereon, in which the parison (R) can be fixed and with a stretching rod (13), enclose by the cylinder (11) and which may be passed through the nozzle (12), wherein the nozzle (12) can be supplied with compressed air via openings (14) in the cylinder (11). The station (10) is characterized in that the stretching rod (13) is driven by a single tubular electric linear motor (15) the stator (15-1) of which is mounted on the cylinder (11) and the armature (15-2) of which is connected to the stretching rod (13).

Abstract: The invention relates to an arrangement of pulse-modulated quick-acting valves on a fluid storage device, wherein the valves have different nominal widths for operation thereof in different pressure ranges with otherwise identical structure. The number of the valves and the respective nominal widths thereof is selected and matched to a fluctuation range of the pressure in the storage device such that over this fluctuation range of the storage device pressure, by complete opening, complete closing and/or switching individual valves or valve combinations, a total dispensed mass flow of the fluid from the storage device in a fluctuation range of varying mass flows of constant pressure as required can be produced.

Abstract: The invention relates to a device (10) for blow moulding a container from a parison, comprising a blowing cylinder (11) and a blowing nozzle (12) mounted thereon, in which the parison (R) can be fixed and with a stretching rod (13), enclose by the cylinder (11) and which may be passed through the nozzle (12), wherein the nozzle (12) can be supplied with compressed air via openings (14) in the cylinder (11). The station (10) is characterised in that the stretching rod (13) is driven by a single tubular electric linear motor (15) the stator (15-1) of which is mounted on the cylinder (11) and the armature (15-2) of which is connected to the stretching rod (13).

Abstract: The invention relates to a device for injecting compressed air into a parison, having an injection cylinder, having a hollow shaft arranged inside the housing of the injection cylinder in a manner so as to be displaceable along its longitudinal axis (A), one end of said hollow shaft projecting out of the housing and provided with a connection head for the tight connection to the parison, and having a stretching rod arranged coaxially to the hollow shaft in the interior of the hollow shaft and displaceable coaxially with the hollow shaft. A double piston is arranged axially parallel to the hollow shaft. The double piston is connected to the hollow shaft by a connection lug and thereby moves the hollow shaft along its longitudinal axis (A) between a lower and an upper end position. According to the invention, the active surfaces of the double piston are each arranged in a control chamber connected to a separate control line, which are configured in the housing of the injection cylinder.