There are several types of pressure regulators according to their purpose.
The steam pressure regulator after itself is a pressure reducing valve.
The most commonly used pressure reducing valve, also in the technical literature there
may be another name for it – a steam pressure regulator after itself. The task of such a valve is to maintain a constant pressure in the pipeline behind the valve. In the event of an increase in inlet pressure, the valve disc closes, narrowing or, in other words, reducing (hence the name reduction) the flow area in the valve, thereby avoiding an increase in pressure behind the valve. In the event of a decrease in pressure, the valve, on the contrary, opens, maintaining the previous pressure value.
The steam pressure regulator to itself is a bypass valve.
Another valve is called a bypass valve or, in other words, a steam pressure regulator up to itself. The main purpose of the bypass valve is to maintain a constant pressure in the pipeline up to the valve. In the case of an increase in pressure at the inlet, the valve opens and bypasses (due to which it is called bypass) a part of the medium through itself, leaving the pressure up to the valve unchanged. Here the principle is the same as for a standard relief valve, with the only exception that a relief valve is generally not designed to operate in this mode all the time, while a bypass valve can regulate the flow almost constantly.
The differential pressure regulator is another regulator that serves to maintain differential pressure. Maintaining a constant differential pressure allows you to get a constant flow in certain areas of the system, which, in turn, allows for more accurate temperature control