Abstract: The damper for pressure measuring systems is integrated in the body (5) or insert of a valve. Flow passages (6, 7) communicate with a compartment (9) which is sealed by a rubber-elastic diaphragm (10). The side of the diaphragm remote from said compartment (9) defines a second compartment (13) which is connected to atmosphere through a port (14) designed to provide flow resistance.

Abstract: A metering device for adjusting a flow rate of a flow of liquid comprises a flow-rate adjusting device including a rotatable adjusting member, and an actuating member for rotating the adjusting member. The actuating member is connectable with the adjusting member and may be disengaged therefrom in a respective adjusted position in order to avoid unintentional or incomplete adjustment of the metering device. A hexagonal head and a mating hexagonal recess are provided on either the adjusting member or the actuating member to effect engaging and disengaging of these members.

Abstract: In a pressure meter catheter which carries a pressure sensor in its measuring tip a reference pressure is admitted to effect zero setting in accordance with the invention while the instrument is in situ during a measurement, the reference pressure permitting adjustment of an evaluating unit at a remote location. Preferably, the measuring tip is surrounded in sealing fashion by a balloon which can be inflated through the line in the catheter tube through which atmospheric pressure is applied to the sensor as reference pressure for the measurement. Thus the same pressure is available both at the measuring connection and at the reference connection of the sensor, and the pressure differential measured by the sensor consequently is exactly zero.