Self-operated regulating valve performance

Self-operated pressure regulating valve, also known as self-operated control valve, is a new type of regulating valve. As the name implies, it does not need external power supply and secondary instrument. It relies on the pressure and temperature of the medium flowing through the valve as the energy to drive the valve to work automatically. The feedback signal (pressure, differential pressure, temperature) at the valve output end is transmitted to the actuator through the signal pipe, and the valve disc is driven to change the opening of the valve to regulate the pressure, flow Purpose of temperature.

Self-operated regulating valve type

Self-operated regulating valve can be divided into self-operated temperature regulating valve, self-operated pressure regulating valve, self-operated flow regulating valve, etc. according to its structure and function, which can be used for automatic regulation of most fluid media. It can effectively convert the energy of the fluid medium into driving force, thus controlling the opening and closing of the valve.

Working principle of self-operated regulating valve

When the medium fluid flows from the front of the valve and passes through the valve core and valve seat for throttling, it is converted into the pressure behind the valve. Then input the upper chamber through the pipeline to act on the top tray, and the force generated at this time will be equal to the reaction force of the spring. This determines the relative position of the valve core and valve seat, thus controlling the pressure behind the valve. When the pressure behind the valve increases, the force acting on the top plate also increases, making the valve core close to the position of the valve seat, so that the gap between the valve core and the valve seat decreases, and the flow resistance increases, and the pressure behind the valve decreases. Until the force on the top plate is balanced with the spring reaction force, the pressure behind the valve will drop to the preset value. When the pressure behind the valve decreases, the direction of action is opposite to the previous one. This is the working process of the self-operated regulating valve.

For the traditional control valve, the self-operated control valve does not need external energy. It can effectively adjust the properties of the fluid medium only by relying on the output signal of the regulated medium. This not only greatly saves the cost of some additional accessories, but also reduces the use of energy, meeting the call of the country for energy conservation and emission reduction.