Regulators for Steam and Air

These types of regulators are used on many machines to regulate steam and air. They can also regulate any other valve where a set pressure is needed.

When regulating a pressure vessel to a set value two types are needed to allow regulation to come to a stand still.

You see a difference on these regulators either by color or machined in groove.

Black or groove means its a "Differential regulator" . 

Important also is to watch for "nozzles" in A and P ports. They will give a softer actuation and also regulate volume. A large butterfly valve needs full flow but a 1/2" angle valve does not.

Some regulators  have one or two nozzles depend on function required.