Abstract: A diaphragm valve includes a valve body and a compressor which is actuatable by a valve stem for operating a diaphragm and has an outer circumference which is formed with at least one axial groove. The compressor is guided by an intermediate piece in axial direction and restrained by the intermediate piece against rotation. The intermediate piece has an inside wall which is formed with at least one axial guide nose for engagement in the groove of the compressor.

Abstract: A compressor for operating a diaphragm of polymer material for a diaphragm valve includes a base body having a diaphragm-proximal surface, and a material layer at least partially provided on the diaphragm-proximal surface and having a very low coefficient of friction.

Abstract: A diaphragm valve includes a valve body defining a passageway constructed to form a valve seat, and a diaphragm. A compressor moves the diaphragm between a closing position in which a flow of fluid through the passageway is barred as the diaphragm is caused by the compressor to seal the valve seat, and an open position in which at least part of a cross section of the passageway is bounded by the diaphragm to thereby enable a flow of fluid through the passageway substantially without narrowing the cross section of the passageway.

Abstract: A flowmeter for measuring a flow velocity of a fluid in a pipeline includes a measuring tube having opposite ends. Two ultrasonic transducers are disposed respectively at the opposing ends of the measuring tube, and two connection pipes are provided for attachment of the flowmeter to the pipeline and extend in axial relationship to the pipeline.

Abstract: A valve body for a valve assembly includes a main passageway in which a primary valve is received which has a weir constructed to define a valve seat and to interact with a valve element in the form of a diaphragm. Integrated in the valve body is a secondary valve having a weir which defines a valve seat and interacts with a second valve element in the form of a diaphragm. The secondary valve is constructed to allow establishment of a fluid communication upstream of the valve seat of the primary valve between the main passageway and a branch line, via which a medium sample can be extracted and/or steam and/or condensate can be, optionally, released.

Abstract: A flowmeter includes a floating body which floats freely in a stream in a measuring tube, and is acted upon by a flowing force, buoyancy and a weight. In order to generate a counterforce, a measuring spring is fixedly connected to the floating body. The floating body is preferably self-stabilized through a selection of corresponding geometrical relationships. The measuring spring can optionally be rotatably supported on the floating body and/or the measuring tube. The floating body is suitably made of light weight plastic material, so that the density (mass/volume) of the floating body matches the density of the flowing medium.

Abstract: A hand drive for shut-off members is described, for example for membrane valves, the hand drive comprises a hand wheel for actuating the valve which is provided with a closure limiter and a valve lift limiter, the hand wheel is provided with two inserts mounted thereon for axial adjustability; and wherein the inserts interact with a threaded spindle coupled with a valve element so as to adjust the valve lift limiter and the closure limiter.