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The Hydrogen Chamber Valve is integrated into the Vinci engine of the Ariane 6 upper stage. This normally closed pneumatic poppet valve is located upstream from the combustion chamber and its purpose is to control the gaseous hydrogen supply to the engine combustion chamber.

The Oxygen Chamber Valve (VCO) is a bi-stable pneumatic ball valve, located upstream from the combustion chamber. Its purpose is to control the liquid oxygen supply to the engine combustion chamber.

The Purge Valve (PV) allows the engine’s chill down and manage the engine transients. It can open under high pressure.

The Hot Gas Valve (VGC2) is a pneumatically actuated throttling valve on the Ariane 5 Vulcain 2 cryogenic engine. It is located downstream of the gas generator.

The Hot Gas Valve (VGC 2.1) is an electrically actuated throttling valve on the Ariane 6 Vulcain 2.1 cryogenic engine, located downstream of the gas generator. Its position is fixed during flight.

The Chamber Valve (VC) is part of the Ariane 5 and 6 Vulcain cryogenic engine. The VC provides very low propellant leakage tightness under cryogenic conditions and at the same time a very low pressure drop in open position.

The Purge Valve (PV) is a normally open pneumatic poppet valve. It allows the engine’s chill down and manages the engine transients. Part of the Vulcain cryogenic engine, the PV remain closed at high propellant pressure even in case of a loss of the helium command pressure.