Imported self-operated control valve
Imported self-operated regulating valve product overview
The imported self-operated regulating valve is divided into two types according to the position of the pressure point before the valve and after the valve. When the pressure point is in front of the valve, it is used to regulate the pressure before the valve is constant; when the pressure point is behind the valve, the pressure is constant after the valve. .
When the pressure before and after the valve is introduced into both sides of the air chamber of the actuator at the same time, the self-operated pressure difference regulating valve can adjust the pressure at both ends of the regulating valve to be constant, and can also introduce the pressure difference between the two ends of the orifice plate installed on the pipe into the membrane for execution. Both sides of the air chamber of the mechanism.
Compose a self-operated flow control valve, or use other methods to detect the flow and use a self-operated differential pressure control valve to adjust the flow.
Imported self-operated control valves are divided into three series: imported self-operated pressure control valves, imported self-operated temperature control valves and imported self-operated flow control valves.
The role of imported self-operated control valve
Imported self-operated control valves all use feedback signals (pressure, pressure difference, temperature) from the valve output end to be transmitted to the actuator through the signal tube to drive the valve flap to change the valve opening to achieve the purpose of adjusting pressure, flow, and temperature.
Advantages of imported self-operated control valve
Imported self-operated control valve is a new type of self-operated control valve. Compared with the manual control valve, its advantage is that it can be adjusted automatically;
Compared with the electric control valve, its advantage is that it does not require external power. Application practice has proved that in closed water circulation systems (such as hot water heating systems, air conditioning and chilled water systems), the correct use of this valve can easily realize the flow distribution of the system; it can realize the dynamic balance of the system; it can greatly simplify the system The debugging work; can stabilize the working state of the pump.
Classification of imported self-operated control valves
Imported self-operated control valves are divided into two types: direct acting and indirect acting.
1: Direct-acting control valve
Direct-acting control valves are also called spring-loaded control valves. There are elastic elements in the structure: springs, bellows, bellows-type temperature bulbs, etc., using the principle of balancing elastic force and feedback signals.
2: Indirect-acting control valve
The indirect-acting control valve adds a pilot (pilot valve) which amplifies the feedback signal and then drives the main valve disc movement through the actuator to achieve the purpose of changing the valve opening.
If it is a pressure regulating valve, the feedback signal is the outlet pressure of the valve, which is introduced into the actuator through the signal tube.
If it is a flow regulating valve, there is an orifice plate (or other resistance device) at the outlet of the valve to take the differential pressure signal from both ends of the orifice plate into the actuator.
If it is a temperature regulating valve, there is a temperature sensor (or temperature bulb) at the outlet of the valve to drive the actuator through the thermal expansion and contraction of the medium in the temperature sensor.

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Customers have special requirements for products, and must provide the following instructions in the order contract:
(1) Structure length;
(2) Connection form;
(3) Nominal diameter, full diameter, reduced diameter, pipe size;
(4) Operating medium, temperature and pressure range;
(5) Experiment, inspection standards and other requirements;
(6) Various driving devices can be configured in this field according to the special requirements of customers;
If the determined valve type and model are provided by the customer, the customer should correctly explain the meaning and requirements of its model, and sign the contract under the conditions that the supply and demand sides understand and agree.