Abstract: The invention relates to a sealing ring for sealing a piston rod of a piston compressor. The sealing ring comprises three segments, wherein the segments have portions extending in the circumferential direction of the sealing ring, which form an overlapping joint. The overlapping joint brings about an excellent sealing effect in the axial direction.

Abstract: A sealing ring, in particular for a piston rod with a circular cross-section, which has a height in the axial direction as well as a surface oriented towards a sliding surface, with the surface being executed to extend cylindrically over a part of the height in order to form a sealing surface and being executed to become wider along a further part. The sealing ring has a high sealing action in the axial direction so that a majority of the gas flows out between the piston rod and the sealing surface so that a gas storage arises.

Abstract: A sealing element for a dry running piston compressor, in particular for a dry running oxygen compressor, contains perfluoroalkoxy-copolymer.

Abstract: Sealing arrangement for a piston rod with a circular cross-section, comprising a one-piece sealing ring with a parting joint and compensation clearance as well as a cover ring surrounding the sealing ring in the peripheral direction, with the sealing ring having a section which extends in the peripheral direction of the sealing ring at at one end and forms an overlapping ring joint together with the other end of the sealing ring, and with the sealing ring having a radial wall thickness decreasing towards the parting joint. This arrangement has an excellent sealing action in a direction axial to the arrangement.

Abstract: The choke arrangement comprises an elastic choke ring which consists of a single piece with a gap formed by a parting joint. The choke arrangement: further comprises a support ring which is arranged directly adjacent to the choke ring in the axial direction, with the support ring serving, among other things to cover over the gap of the choke ring. An advantage of the choke arrangement with an elastically resilient choke ring is to be seen wherein the choke ring reacts to dynamic pressure changes and thereupon changes its sealing properties. A peak in pressure produces an increased difference in pressure at the choke arrangement, whereby the elastic choke ring is pressed against the sliding surface of a piston rod and effects an increased sealing action, so that the pressure peak cannot propagate to a sealing ring placed after the choke arrangement.

Abstract: The invention embraces a method of tanking or filling of motor vehicles with natural gas and also an apparatus for operating the method of the invention. The motor vehicle includes a tank apparatus (2) with a pressure container (19). A tanking plant (1) includes a storage unit (3) for natural gas, a delivery device (5) and also a connection line (14) which can be connected to the tank device (2). The delivery device (5) includes a control and measuring device (5a), a regulating device (5b) and also an input and output device (5c). The control and measuring device (5a) has a regulating valve (7), a mass throughflow measuring device (8) and also a pressure sensor (9), with these three components being so controlled from the governing regulating device (5b) that the pressure container (19) is filled in a short period of time with natural gas.

Abstract: The annular valve (10) comprises a valve seat (11) attached in the housing (1) of the compressor, an absorber (14) attached thereto at a distance and an annular sealing component (12), which can move between the valve seat and the absorber. Helical springs (2), which move the sealing component in the closing direction towards the valve seat, are distributed over its periphery between the absorber and the sealing component. Each helical spring (2) is fastened with one end in the absorber (14). In the region of the other end of each helical spring (2), the sealing component (12) is provided with guide means (6) for the respective spring end.

Abstract: The piston compressor has at least one cylinder (11) and a piston (10) guided therein in contact-free manner, which is connected via a piston rod (8) to a crosshead (6). The piston rod consists of a pipe (8) extending between the crosshead (6) and the piston (10). In this pipe extends a tension rod (9), which can be extended by means of a hydraulic stretching device (30) and under prestressing pulls the crosshead and the piston towards the pipe.

Abstract: A refuelling equipment (7) may be connected via an adjustable loading valve (30) to three groups of intermediate stores (4, 5, 6) in which natural gas is stored at different storage pressures. The loading valve (30) contains three inlets, each of which is connected via a feedline (13a, 14a or 15a respectively) to one of the intermediate stores (4, 5 or 6 respectively), and one outlet which is connected via an outlet line (24) to the refuelling equipment (7).

Abstract: The piston (6) guided in a cylinder (1) has at least one split so-called trapped piston ring (10) disposed in an annular groove on the piston. The circumferential face (12) of the ring remote from the inner face (11) of the cylinder bounds in the annular groove a space (23) which is acted upon by the pressure of the gas in the compression space. Starting from this circumferential face (12) the piston ring exhibits two radial boundary areas (13, 14) parallel with one another, of which the area (14) next to the compression space extends over part of the radial width of the ring. The piston ring (10) is guided by its two parallel boundary areas (13, 14) to slide against corresponding areas in the annular groove. The remaining area (16) of the piston ring next to the compression space, starting from the circumferential face (15) next the inner face (11) of the cylinder, forms a wedge face which extends at an angle of from 5.degree. to 15.degree.

Abstract: The piston compressor exhibits at least one piston (7) which is supported to be freefloating and connected via a piston rod (6) to a crosshead (5). The piston rod slides in a guide bearing (8) next to the crosshead in a gland (11) next to the cylinder. A ring (15) of porous material is arranged on the piston rod (6) between the guide bearing (8) and the gland (11). The ring (15) exhibits a circumferential groove which is intended for receiving a tubular spring and the depth of which--measured from the outside transversely to the longitudinal axis (6') of the piston rod--is at least as great as the outer diameter of one turn of the tubular spring.

Abstract: The apparatus for removing oil from a compressed gas flow includes a separator in which the oil is removed and initially collected as well as a vessel for receiving the collected oil from time-to-time. The vessel is disposed below the separator and communicates therewith by way of connecting lines employing shutoff valves. The vessel serves to collect the oil over time and permits a discharge of oil therefrom while completely separated from the separator.