Hoerbiger Ventilwerke Aktiengesellschaft

Hygrama Ag

Ultratroc Gmbh

Herbert Kuhnelt

Friedrich Bauer

A membrane dryer apparatus for moist air includes a housing (1) that contains a tubular fabric strand bundle (7) of tubular fabric strands (8) made of selective absorption material through which air to be dried flows, water vapor diffusing through the fabric and collecting on its outside. A portion of the dried compressed output air is channeled off near the discharge (12) of the membrane dryer and passed through a scavenging air duct (14) having a throttle (16) and passed around the outside of the fabric strand bundle to scavenge moisture and remove it through discharge openings (17, 18) to the outside air. To limit consumption of scavenging air, an independent shut-off valve (19), working as an airflow sensor, is installed in the output air duct (13), and this shut-off valve (19) opens only when output air is actually extracted by a user. This shut-off valve (19) regulates at the same time the scavenging air duct (14) whereby the shut-off valve (19) is connected to a scavenging air valve (22) which is actuated by a control line (23) that in turn is regulated by the shut-off valve (19) and branches off from the output air duct (13). This causes scavenging air to flow through the scavenging air duct only when the shut-off valve (19) is open and output air is discharged from the membrane dryer apparatus.

Membrane dryer for drying moist air with valved scavenger duct

A fluid cylinder control method for monitoring the position or controlling the movements of a piston which is slidably guided in a cylinder tube and is acted upon on at least one side by a pressure medium, in particular, maintaining the piston in a predetermined position against the action of eventual disturbance forces. This is attained in that the force which is transmitted between the piston and the cylinder by way of the parts which are slidingly guided on each other, and in particular the friction force acting by way of the seal gaskets of the piston and/or of the rod, is measured and the loading of the piston by a pressure medium is varied in the sense of reducing the measured force.

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Vienna, Austria

Herbert Kuhnelt