Abstract: A pinch valve having a valve housing, wherein the valve housing has a valve inlet and a valve outlet and a sleeve arranged between the valve inlet and the valve outlet, wherein the sleeve is connected to the valve inlet and the valve outlet and forms a valve channel, which valve channel can be flowed through in a conveyed direction by a conveyed medium, wherein the pinch valve further has a pinch bar, which moves back and forth in a closing direction between an open position and a closed position, wherein the pinch bar is in contact with the sleeve at least in the closed position, such that the pinch bar exerts a closing force on the sleeve in the closing direction, such that a channel cross-section of the valve channel perpendicular to the conveyed direction between the valve inlet and the valve outlet can be reduced and/or closed, wherein the sleeve has at least two material layers between which a first textile fabric, preferably a mesh, is arranged.

Abstract: A boring head for fixing a boring tool includes a main body mounted to a rotatable tool holder, a piston being received within and movable with respect to the main body in a radial direction, wherein a circumferential surface of the piston has a flat face parallel with the radial direction, and a combined orientation and fixation device for orienting and fixing the piston with respect to the main body. The combined orientation and fixation device includes a blind sleeve mounted in the main body, a flexible end wall of the blind sleeve facing the flat face of the piston, and a tightening screw configured for engagement with the blind sleeve so that the flexible end wall presses against the flat face when the tightening screw is tightened to press the piston against the main body and to simultaneously orient and fix the piston with respect to the main body.

Abstract: The present invention relates to a pinch valve (1) with a housing which has an inlet (2), an outlet (3) and a control opening (4) for connection to a pressure medium, inlet and outlet being connected to each other via a passage, the passage having at least two sections with a different cross-section (12), and a valve sleeve (16) which is connected to the inlet and outlet and arranged such that it forms a valve channel between inlet and outlet, the valve sleeve (16) moving, upon application of a pressure medium to the control opening (4), such that the channel cross-section between inlet and outlet is reduced or closed. In order to provide a pinch valve can be produced simply and at favourable cost and also seals reliably, it is proposed according to the invention that the housing is formed in at least two parts, one housing part forming the section with a smaller passage cross-section and the other housing part forming the section with a larger passage cross-section.