Connection system for a pressure cylinder

Connection system for a pressure cylinder, comprising:

• a check valve with a first central axis;
• said check valve being located in a neck of the pressure cylinder;
• said check valve having a connection opening for gas removal;
• said check valve including a valve tappet for operating said check valve by displacement of said valve tappet along said first central axis;
• a connecting device with a second central axis;
• said connecting device being connectable in a gas-tight, detachable locking manner with said check valve;
• said connecting device containing means for displacing said valve tappet of said check valve;
• and
• means for mechanically and detachably coupling in a first step the pressure cylinder with said check valve to said connecting device to form a swivel joint with a pivot axis lying at right angles to and outside said first and second central axes and with said first central axis being inclined with respect to said second central axis, said means enabling, in a second step said pressure cylinder with said check valve and said connecting device to be connected in a gas-tight manner in said coupled state by pivoting relative to one another about said pivot axis until said first central axis is in alignment with said second central axis.