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BS4 valve, or British Standard 341 No. 4, is a specific type of gas cylinder valve outlet. This standard specifies the connections for gas cylinders in the UK. The BS4 connection is used for flammable gases, including:

• Acetylene

• Hydrogen

• Methane

• Propane

• Carbon Monoxide

A carbon monoxide regulator with a BS4 valve is a pressure regulator designed to connect to a cylinder with a BS4 valve outlet for safe and controlled use of carbon monoxide gas.

Key features of a BS4 valve and regulator for carbon monoxide include:

• Connection Type: The valve outlet has a 5/8-inch BSP left-hand thread.

• Safety: The left-hand thread is a safety feature that prevents a regulator for a flammable gas from being connected to a cylinder containing a non-flammable gas.

• Regulator Function: The regulator reduces the high pressure of the gas in the cylinder to a lower, usable pressure for specific applications.

• Materials: These regulators are often made of high-purity brass or other materials compatible with the gas to prevent contamination and corrosion.