Valve device for shutting off and opening a gas flow to an analyzer of a gas measuring system

摘要

The invention relates to a valve device (101) for shutting off and opening a sample gas and / or Kalibriergasstromes to an analyzer of a gas detection system. The valve device (101) has a flow housing (10) with inlet (12) and outlet (21), an electromagnetic, bistable actuator (56) with coil (60; 62), core (63; 64) and axially movable armature (68 ), which is held at least in an end position by a permanent magnet (66), a valve unit (74), which has a valve rod (76) and an associated valve closing body (84) and with the armature (68) is movable, a valve seat ( 24), on which the valve closing body (84) can be lowered and from which it can be lifted and which is arranged in the flow housing (10) between the inlet (12) and outlet (21) and an optical position sensor (102) on the at least one closed position the valve unit (74) is detectable. According to the invention, one or more electrical heating elements are located in the flow housing (10) and the electromagnetic actuator (56) protrudes from a push rod housing (52) at an end of a push rod housing (52) opposite the flow housing (10), which is spaced from the flow housing (10). is arranged, wherein the armature (68) via a pin-shaped element (70) and a push rod portion (72) made of thermally insulating material with the valve rod (76) is connected.