Georg Fischer Aktiengesellschaft

Georg Fischer Rohrleitungssysteme Ag

Georg Fischer Wavin Ag

Peter Haug

Jorg Wermelinger

Joerg Wermelinger

Oliver Trefz

Thomas Helmbold

Ozan Ufuk Topcuogullari

Jörg Wermelinger

A valve assembly () comprising a valve housing (), a stem () that is disposed perpendicular to the direction of flow within the valve housing (), and a blocking member () which can be movably connected to the stem (). The stem () is provided with a device () for limiting torque.

Valve assembly comprising a torque limiter

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.

Method of monitoring the bulge temperature when welding plastic

An arrangement for butt-welding tubular plastic components includes two chucking devices for holding the components in coaxial positions relative to each other and a heating device for heating the ends of the components without contact. The heating device includes a heating element which can be swung between the two chucking devices. The heating element heats the ends of the components without contact by heat rays. The heating element includes a metal plate which is coated with a ceramic coating and which is electrically heatable by heating cartridges.

Arrangement for butt-welding plastic material components

Growing community of inventors

Singen, Germany

Peter Haug