Canister and valve

An aerosol canister for dispensing a product, said canister comprising:

• a high pressure chamber for containing a liquefied or compressed gas propellant;
• a low pressure chamber for containing a gas propellant;
• a product reservoir for containing a product to be dispensed;
• and
• a pressure regulating valve interposed between the high pressure chamber and the low pressure chamber, the pressure regulating valve adapted to provide a fluid flow path from the high pressure chamber to the low pressure chamber when the pressure in the low pressure chamber drops below a predetermined pressure;
• wherein
• the canister further comprises a partition wall interposed between the low pressure chamber and the product reservoir.

An aerosol canister for dispensing a non-medicinal product, said canister comprising:

• a high pressure chamber containing a liquefied or compressed gas propellant;
• a low pressure chamber containing a non-medicinal product and vaporised propellant, the low pressure chamber having an opening for receiving a dispensing valve;
• and
• a pressure regulating valve interposed between the high pressure chamber and low pressure chamber, the pressure regulating valve adapted to provide a flow path from the high pressure chamber to the low pressure chamber when the pressure in the low pressure chamber drops below a predetermined pressure.

A metering valve for dispensing a metered dose of product, the valve including:

• a metering valve body comprising a propellant metering chamber with a propellant inlet and a product metering chamber with a product inlet;
• and
• a metering valve stem with a dispensing nozzle, a propellant inlet plug and a product inlet plug,
• wherein the metering valve stem is movable within the metering valve body to a dispensing position in which:
• the propellant inlet is sealed by the propellant inlet plug and the product inlet is sealed by the product inlet plug;
• and
• the propellant metering chamber and product metering chamber are in fluid communication with atmosphere via the dispensing nozzle, such that a metered dose of product and propellant can be dispensed from the canister;
• wherein the product inlet is positioned between an outlet of the dispensing nozzle and the product metering chamber.

A metering valve for dispensing a metered dose of product from a canister containing the product and a propellant, the valve comprising:

• a metering valve body comprising a propellant metering chamber and a product metering chamber;
• and
• a metering valve stem housed within the metering valve body and having a dispensing nozzle at a first axial end extending from the product metering chamber, an opposing second axial end portion of the metering valve stem extending from the propellant metering chamber,
• wherein the metering valve stem comprises:
• a product channel extending axially within the metering valve stem;
• and
• a propellant channel extending axially within the metering valve stem,
• wherein the metering valve stem is movable within the metering valve body to a dispensing position in which:
• there is no fluid communication between the product channel and the product metering chamber;
• there is no fluid communication between the propellant channel and the propellant metering chamber;
• and
• the propellant metering chamber and product metering chamber are in fluid communication with atmosphere via the dispensing nozzle of the metering valve stem such that a metered dose of product and propellant can be dispensed from the metering valve body.