Self-pressure regulating valve used to adjust the industrial automation process control field in the medium flow, pressure, temperature, level and other parameters. According to the control signal in the automation system, automatically adjust the valve opening, so as to realize the regulating media flow, pressure, temperature and liquid level.
The working principle, self-operated temperature control valve (heating)
Temperature control valve according to the liquid can not be compressed and expansion and contraction principle to work. Self-operated temperature control valve for heating, when the controlled object temperature below the set temperature, temperature and package liquid contraction, reduce the role of the actuator on the push rod force, effect of core parts in the spring force the valve open, increase the steam and hot oil heating medium flow, make the controlled object temperature rise, until the accused the object of temperature to the set value, the valve is closed, after the valve is closed, the object temperature drop, valve is opened, the heating medium and into the heat exchanger, and the temperature rise, so the object temperature is a constant. Valve opening size and the controlled object and the actual temperature difference between the set temperature.
Principle two, self-operated temperature control valve (cooling)
Cooling with self-operated temperature control valve works can refer to heating with self-operated temperature control valve, only when the valve member to open and temperature valve instead shut down in the actuator and under the action of the spring force, the valve body through the cold medium, temperature control is mainly used in the cooling device.
Three, self-operated flow control valve works
Accused the media input valve, the valve before the pressure P1 control through the pipeline input lower membrane chamber, through the throttle valve throttle pressure Ps input membrane chamber, P1 and Ps difference △ Ps=P1-Ps is called the effective pressure. Differential thrust thrust and Ps effect of P1 acting on the diaphragm to generate generated in the diaphragm and the spring reaction force equilibrium determined the relative position of the valve core and valve seat, which determine the flow through the valve. When the flow through the valve increases, which increases the △ Ps, P1, Ps respectively, in film chamber, so that the valve is moving towards the direction of the valve seat, thereby changing the valve core and valve seat between the circulation area, increase the Ps, Ps thrust thrust increase in the diaphragm and the spring reaction force and P1 acting on the diaphragm to produce balance to achieve the purpose of flow control in the new position.
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