Connecting apparatus for creating a connection between a measuring instrument/valve block and a pipeline

A connecting apparatus comprising:

• a first connecting device that is connectable to a pipeline or to a metering orifice device in a sealing manner, said first connecting device having a first through-opening in a longitudinal direction;
• a second connecting device that provides a sealing connection to a measuring instrument or to a valve block/valve, said second connecting device having a second through-opening in a longitudinal direction;
• and
• a connecting unit that provides a sealing connection to the first and second connecting devices, wherein
• the first and second connecting devices are interconnected with sealing effect,
• the connecting unit is designed so that the sealing connection can be created solely by rotation of the connecting unit without rotating the first and second connecting devices,
• an upper edge region of the first connecting device has an outwardly pointing outer flange and an end-face sealing surface,
• a lower edge region of the second connecting device has a male thread and an end-face sealing surface,
• the connecting unit is designed as a nut unit with a female thread and an inwardly pointing inner flange which is arranged in the lower edge region,
• the outwardly pointing outer flange of the first connecting device fits behind the inner flange of the nut unit,
• the female thread of the nut unit is screwed onto the male thread of the second connecting device so that by means of the inner flange and the outer flange the end-face sealing surfaces are clamped together with sealing effect,
• a shutoff valve is connected to the second connecting device, a longitudinal axis of which extends obliquely to a longitudinal axis of the apparatus,
• the outer flange and the inner flange are provided in an encompassing manner on the first connecting device or on the nut unit, and
• sealing means are arranged between the end-face sealing surface of the first connecting device and the end-face sealing surface of the second connecting device.