Abstract: A multi-way valve has a housing with a stepped bore forming two piston guiding regions and a shoulder ring with two sealing shoulders. The housing also has a first, second and central transverse bores which are spaced along the cylindrical bore. A contact piston has a piston rod and sealing members secured thereon. The guide members are pressed fit onto opposite ends of the piston rod.

Abstract: A fixing device, for fixing a linearly displaceable machine part relative to a fixedly supported machine part, has a guiding block (11), a bar member passing through the guiding block (11) in a bar guiding mechanism (14). The guiding block (11) has a controllable setting device and clamping members (21) which are provided with through-holes (24) for the bar member. The clamping members (21) in the guiding block (11) are settable by the setting device, between a first position in which the members (21) clamp the bar member and a second position in which the members (21) release the bar member. The clamping members (21) constitute a plurality of congruent plate elements (21) with parallel surfaces. In the release position, the plate elements (21) are located so as to be approximately normal relative to the central axis A1 of the bar guiding mechanism (14) and, in the clamping position, assume corresponding angular positions relative to the central axis A1 of the bar guiding mechanism (14).

Abstract: A pneumatic control device has a control cylinder with dovetailed guiding means with a guiding rail and a guiding groove for holding and guiding housings of reed-contacts or the like. The cross-sectional area of the substantially trapezoidal guiding rail of the contact housing has not the same shape as the trapezoidal cross-sectional area of the corresponding guiding groove of the control cylinder. Provided both elements (rail and groove) have substantially the same height or depth, the width of the guiding rail at the side adjacent to the contact housing is smaller than the gap width (121) of the guiding groove (12) at its open side. The total width of the guiding rail is unilaterally shortened to a size determined by a circle drawn around an edge at the narrow side of the guiding rail having a radius (133) that is at the maximum equal to the gap width (12) of the guiding groove (12).