A high pressure regulator is generally regarded as one that delivers an outlet pressure of more than 500mbar and is used for appliances that require a powerful, concentrated heat output.
It works on the same principle as a low pressure one, but is built to withstand greater force.
High pressure regulators for portable appliances such as welding torches and large barbecues always have a bullnose, or POL, connector in the UK, although other countries may have different fittings.
These regulators are used widely throughout industry whenever a high heat output is needed. Welding torches, blown-air heaters, tar kettles, professional outdoor catering equipment, grain dryers and furnaces are just some of their applications.
Another type is the high purity gas regulator. This is used in laboratories for many scientific purposes including chromatography (separating out chemicals), leak detection, alarm testing and research into cryogenic gases (low temperature gases such as liquid nitrogen and liquid helium).
High purity regulators are often made out of aluminium or stainless steel, which are less sensitive to certain gases than brass or zinc alloy.
You can fit a high pressure regulator yourself provided it’s for a small portable appliance such as a blow torch. Fixed regulators have to be installed by an engineer registered with Gas Safe.