Compared with manual regulating valves, self-operated regulating valves have the advantage of automatic regulation. Compared with electric regulating valves, they have the advantage of not requiring external power. Practical applications have proved that in closed water circulation systems (hot water heating systems, air conditioning, cold water systems, etc.), the correct use of this valve can easily achieve system flow distribution and dynamic balance; it can greatly simplify the system debugging work and stabilize the operation of pumps and other equipment.
Self-operated regulating valves rely on the pressure and temperature of the medium flowing through the valve as energy sources and can operate automatically without external power or auxiliary equipment. This self-operated regulating valve uses a feedback signal source at the valve output end, which is transmitted through the signal source pipe to the working mechanism and drives the valve disc to close the valve port.
Direct-acting self-operated regulating valves are also known as spring-loaded. Their structure is based on the principle of balancing the elastic force and the feedback signal source and has elastic elements such as springs, bellows, and bellows-type temperature valves. For self-operated regulating valves with a pressure gauge, the feedback signal source is the pressure gauge at the valve outlet, which is introduced into the working mechanism through the signal source pipe. For self-operated regulating valves, there is an orifice plate (or other resistor) at the valve outlet, from which the pressure difference signal source can be extracted from both ends of the orifice plate and introduced into the operating mechanism. For self-operated regulating valves based on temperature, there is a temperature sensor (or temperature valve) at the valve outlet, which drives the operating mechanism through the thermal expansion and contraction of the internal medium of the sensor.
Self-operated pressure regulating valves can be used in environments without electricity or gas, have a simple internal structure, and the internal pressure value can be freely set, making operation very convenient and achieving excellent energy-saving effects. Through a high-sensitivity response mechanism and precise control, self-operated pressure regulating valves can flexibly adjust the valve pressure through an internal pressure balance mechanism. The continuous pressure value, cut-off pressure range, and intersection of self-operated pressure regulating valves can be set by themselves, making the pressure control value more precise and accurate, and even capable of detecting very small changes.