Abstract: A pressure valve, particularly for a reciprocating piston pump for conveying pressure fluid in slip-controlled hydraulic brake systems, wherein the pressure valve has a valve seat body and a valve cover body with a pre-tensioning element and a valve element installed in the space formed between the valve seat body and the cover body, which is particularly economical to manufacture, easy to install and particularly safe because of the valve seat body and the valve cover body being manufactured by non-cutting process.

Abstract: The present invention discloses a hydraulic fluid accumulator comprising a housing (1) having an interior subdivided into three chambers (2, 3, 4), with the first chamber (2) being filled with a gas and separated from the second chamber (3) by a first media separation element (6), the second chamber being filled with a fluid and separated by a second media separation element (7) from the third chamber (4) that is also filled with a fluid and connected to a hydraulic port (5).

Abstract: The present invention relates to a piston pump, in particular for controllable brake systems such as ABS or ESP, wherein a working chamber (40) of the pump in front of a piston (3, 52) is delimited by a pressure valve, and a resetting spring (4, 51) with its one end is supported on a valve seat carrier (9, 54) of the pressure valve and with its other end resets said piston (3, 52) into its bottom dead center position. An object is to render the assembly of the mass-produced pumps as inexpensive and simple as possible. To achieve this object, the present invention discloses that the resetting spring (4, 51) be adapted to be attached directly or indirectly to the valve seat carrier (9, 54) in addition.

Abstract: In a piston pump, in particular, for the pressure fluid conveyance in hydraulic, slip-controlled brake systems, comprising at least one piston, a suction valve and a pressure valve, it will be possible for the suction and pressure valves to be externally checked in that the suction valve and the pressure valve are formed on a structural unit adapted to be separately handled. Preferably, the structural unit comprises a sleeve-type section in which the piston is guided.

Abstract: To effectively prevent a hydraulically operated change-over valve for a hydraulic brake system from fluttering, according to the present invention, an air cushion which attenuates pressure pulsations is incorporated in the inlet chamber of the valve. This air cushion is provided in a simple manner by a preassembled unit comprising a metal bowl, a diaphragm, and a metal annular disc which is calked at its periphery with the edge of the metal bowl so that the diaphragm is clamped in a sealed manner.

Abstract: A closing device for closing pressure fluid conveying channels in a housing by a closing member press fitted into a channel. The outside periphery of the closing member including at least one indentation into which, during press fitting the closing member into the channel, basic material of the housing is deformed to provide a form lock, and the channel is configured as a stepped bore having an outside bore portion of large diameter that is remote from the pressure fluid side which, through a step, is followed by an inside bore portion of smaller diameter that is close to the pressure fluid side. The closing member has two piston portions of differently large diameters which correspond to the two bore portions, and the indentation provided between the piston portions is undercut relative to the small diameter portion, and the basic material is press fitted by plastic deformation into the indentation to provide the form lock.

Abstract: The invention pertains to an electrohydraulic pressure control device, with electromagnetically actuated hydraulic valves, which are arranged on a valve-holding element, with coils which extend beyond the valve-holding element, whereby the coils are provided with electrical contact elements at their parts extending beyond the valve-holding element, with a cover which covers the extending coil parts and the contact element, with a support element to hold the coils, that are positioned within the cover, whereby the cover or a portion of the cover is designed as an electromagnetic controller or for holding the connecting parts of an electronic controller. An essentially plate-like carrier element facing the coils features several slots into which form- and/or pressure-locking closing devices are engaged projecting from the outer surface of the cover.