Ventilation valve for heaters, comprising a holding body and an axially displaceable valve body

Ventilation valve (2) for a heater (1) or heating installation, comprising a holding body (4) that can be mounted in an opening or threaded opening (3) of the heater (1) or the heating installation and a valve body (5), which is adjustable axially in the holding body (4), which closes a ventilation passage or ventilation channel (6) in a first position, and which opens the channel after axial displacement, wherein the ventilation channel (6) has one of a diagonal or angled or curved course deviating from an axial orientation and has an inlet (7), which is located in an interior of the heater (1) in a position of use and which is arranged higher than an outer outlet (8) thereof, wherein the ventilation channel (6) is arranged at least partially or completely in the valve body (5), the valve body (5) is adjustable or displaceable axially for opening the channel relative to the holding body (4) against a restoring force, via which the inlet (7) of the ventilation channel (6) is biased into the closed position within the holding body (4) and after axial displacement is moved out from the holding body to the interior of the heater (1) or the heating installation while a periphery of the valve body remains sealed against an inner periphery of the holding body, and the valve body (5) and the holding body (4) can be adjusted relative to each other in a rotational direction, and the valve body (5) is axially displaceable for venting by being axially pressed from the first, closed position into the holding body (4) against the restoring force to an open position, and upon release, the restoring force alone returns the valve body to the first, closed position.