Abstract: A handle (2) as actuating device for valves (1) is proposed, comprising a fastening head (10) for fastening to a spindle (7) of the valve (1) and an actuating arm (11) for rotatably actuating the spindle, the spindle (7) being arranged in a valve housing (5) so as to be rotatable about the axis of rotation of a sealing part, the actuating arm (11) being arranged to be movable perpendicularly to the axis of the spindle (7) from a closed position into an open position of the valve (1). The actuating arm (11) has means (14) for preventing the actuation of the handle (2), the fastening head (10) has a fastening means (21) for fastening the handle (2) to the valve spindle (7), and the handle (2) has a sealing plate (15) for sealing the fastening means (21).

Abstract: A loose flange for connecting pipes, the flange having radially inwardly oriented and elastically deformable oblique surfaces. The clamping force capacity of the loose flange is improved as a result. A method for producing the loose flange is also disclosed.

Abstract: A clamping device for fixing plastic molded parts during welding is proposed, comprising a flange-like fastening part for fastening on a plastics welding device, the fastening part having at least one first annular recess for receiving a clamping element and the fastening part having at least one second recess for receiving spring elements acting radially on the clamping element, the clamping element having at least one projection on an inner surface which is arranged opposite the outer surface of the plastic molded part. The clamping element allows good fixing of the plastic molded parts in a very confined space.

Abstract: A ball valve is provided with a one-piece housing, in which a ball is accommodated such that it can rotate. In addition to an upper bearing point, the ball valve has a lower bearing point, which is located diametrically opposite the first. The ball and the housing are matched to each other in such a way that the ball can be inserted into the housing from the outside via a fluid opening. In order to fix the ball inserted into the housing, provision is made for screw-in elements which have a spherical seal on the front side.

Abstract: The invention relates to a valve self-piercing tap for a plastic tube with a plastic housing (1) which has a branch connection member (2) and holds a valve body (3), in which a blocking body (5) engaged with a threaded spindle (6) and carrying a punch ring (9) for forming an opening in the plastic tube is displaceably arranged to be moved into axial engagement with a valve seat (10) to block access to the branch connection member (2). To avoid sealing rings, the valve body has at least one circumferential groove (12) with a side (13) directed towards the outlet (11). The housing is injection-molded around the valve body.

Abstract: A shaped part formed as a welding sleeve, consisting of thermoplastic material with a resistance wire winding arranged on its inner circumference, having at least one weld indicator. The indicator consists of a stem which is formed from the material of the body of the shaped part or sleeve. The stem prevents the material which comes under increased pressure upon the welding operation, and is urged towards the surface of the sleeve, from passing into the free space, by the resting against a corresponding surface of the sleeve recess.

Abstract: The invention proposes an apparatus an a method of welding together articles made of a termoplastic material by means of a butt welding method. The articles are held in coaxial relationship by means of a pair of clamping mechanisms. A heating element can be brought between the two articles to heat up their respective facing front faces, whereafter the heating element is removed and the heated front faces brought into mutual contact. For determining the strength of the welding zone, the ambient temperature is considered. For this purpose, a thermal sensor is provided that is arranged at the welding apparatus. The thermal sensor is thermally insulated against the welding apparatus.

Abstract: In a pneumatically or hydraulically driven membrane valve assembly with a pressure piece actuated by a pressure spindle, a membrane support member designed as a coupling member engages the pressure piece. The membrane member is connected to the membrane support member by means of a releasable coupling extending through the pressure piece. The pressure spindle can be coupled to the membrane support member by a releasable ridge/groove-connection. Thereby, all types of medium membranes can be coupled even at a later stage. The valve assembly has a top housing portion, an intermediate housing piece and a bottom housing portion. The top housing portion is connected to the intermediate piece by screwing it thereon. Both the top portion and the intermediate piece have circumferential stop faces engaging each other in the screwed on state and having at least partially differing pitch values for creating a predetermined bias in the thread.

Abstract: In a process for the detection of the limit level of liquids and bulk materials in containers and pipelines, the change in the oscillation behavior of a sensor which is excited to oscillation is detected electronically and used to trigger a switch command. As sensor there is used a parallel bimorph piezoelectric element (22) having a common central electrode (44) and two outer electrodes (46, 48). A first alternating voltage (U1) with an oscillator frequency (f1) is applied between the central electrode (44) and a first outer electrode (46), a second alternating voltage is measured as amplitude of oscillation (U2) with corresponding oscillation frequency (f2) between the central electrode (44) and the second outer electrode (48), and the measured amplitude of oscillation (U2) or oscillation frequency (f2) is converted into an output switch signal.

Abstract: In a connection between a pipe and a molding, a tubular housing, fixed on the molding, engages around the pipe with an inner wall tapering conically toward the free end of the housing. Arranged between the pipe and the housing inner wall is a clamping ring, which braces the pipe with the housing in a wedge-like manner. The clamping ring is held in its wedging functional position by a spring element acting on it in the axial direction. The spring element can be locked in a prestressed state without force acting on the clamping ring. To establish the connection between the pipe and the molding, a locking clip passing through the housing is pulled out of the housing to relax the spring element.

Abstract: The invention provides a method of welding together articles made of a thermoplastic plastic material by means of a butt welding process, whereby the two articles to be welded together are held in place in coaxial relationship by means of clamping devices. Then, the two articles are heated up by means of a heating device that can be placed between the two articles to create a molten up welding zone in the region of each of the free ends of the two articles. As soon as the welding zone has reached the proper temperature, the two articles to be welded together are pressed together to create a bulge. Finally, the temperature of that bulge is continuously monitored and the temperature of the material in the interior of the afore mentioned welding zone is calculated according to the formula ##EQU1## until such a temperature is reached at which the articles can be removed from the clamping devices.

Abstract: A magnetic induction flowmeter to measure the rate of flow of a fluid features a plastic flow element (10) with a tubular section (12) adjoining a flow channel (18). Electrodes (22) penetrate the tubular section (12) and are positioned at a distance from each other in the flow channel (18). The electrodes (22) are made of an electroconductive material composed of a base material and an electroconductive supplemental substance finely distributed within said base material. The base material is identical to or is related to the plastic of the flow element (10) and the electrodes (22) are joined with the tubular section (12) of the flow element (10) to form a homogeneous material compound.

Abstract: A device for measuring the flow rate of a fluid with ultrasonic has a measuring tube (12) with ultrasound transducers (26), arranged in the area of its ends, as well as connecting pieces (16) for the inflow and discharge of the fluid which are arranged coaxially with respect to one another. The measuring tube (12) is arranged coaxially with respect to the connecting pieces (16) and the ultrasonic transducers (26) are positioned between the measuring tube and the connecting pieces. With this arrangement, the effective length (1) of the ultrasonic measuring section may be increased when the laid length (L) is predetermined.

Abstract: A valve which allows for two-directional flow comprises a housing defining an axial flow channel; a flow control body disposed within the axial flow channel, the flow control body having a recess for receiving flow impact surfaces which allow for two directional flow; a closure member disposed within the axial flow channel; and drive means for displacing the closure member in an axial direction for selectively sealing and unsealing the drive means on the flow control body.

Abstract: In a process for the connecting of plastic tubes the wall of which has a corrugated cross section by electro-thermal welding, filling cores of plastic are inserted in the corrugation troughs of the tubes to be connected on both sides of a welding joint in order to form a resting surface on the outer circumference of the tubes and an electric heating mat which surrounds the resting surface of all filling cores is placed on the resting surface.

Abstract: In a device for monitoring the valve stroke of a valve that is pneumatically or hydraulically driven and comprises a valve body that is actuated by means of a pressure spindle (16), in particular, a diaphragm valve, a control spindle (20) is effectively connected to the pressure spindle (16). A control element (38) is arranged on the control spindle (20) in order to actuate a measuring element that serves as a signal transmitter for the valve position. The control element (38) has a control surface (40) that is inclined relative to the actuating axis (z) of the control spindle (20), and a displacement transducer (36) that measures the respective distance from the control surface (40) which corresponds to the valve position is arranged on the valve.This device makes it possible to monitor continuously the valve stroke over the entire range of movement of the valve.

Abstract: A molded part has welding sleeve portions (2) which are each provided with a heating coil (3a, 3b) for joining to tubular parts. A cylindrical sleeve end part (7) can be tensioned by at least one tensioning system against the inserted tubular part, thus providing fixing and holding of the parts before welding and during welding.

Abstract: Device for monitoring the valve lift of a pneumatically or hydraulically driven valve, the valve body of which is actuated by a pressure spindle (16), specificelly a diaphragm valve where a drive spindle (20) and pressure spindle (16) are effectively connected. Two trip cams (38, 40) separated by the distance (a) are mounted on the drive spindle (20) to activate two limit switches (34,35) that act as position indicators for the two valve positions, whereby one trip cam (38, 40) is assigned to one limit switch (34, 35). The automatic positioning of the trip cams (38, 40) during the initial actuation of the valve is accomplished by a crossbar (36) that acts as a driver and is located between trip cams (38, 40). The trip cams (38,40) are mounted on drive spindle (20) by moveable clamps.

Abstract: A welding sleeve includes a sleeve body having a recess for receiving a plug contact. The recess has sidewalls and a bottom wall. The bottom wall is provided with a projection which defines with the side walls of the recess a pair of slots. The plug contact includes an insertion part adapted to be received within the recess. The insertion part includes leg portions to be received in the slots of the recess and a slit between the legs adjacent the top surface of the projection. The slit receives a portion of the heating element which rests on the top surface of the projection. The width (b) of the slit is less than the diameter (d) of the heating element so as to insure good electrical contact.