Self-operated flow control valve and regulator valve are used in series to achieve high and low direct heating

A method for realizing high-low-level direct-connected heating by using a self-operated flow control valve in series with a pressure-regulating valve. This method mainly involves the following equipment: pressure pump, check valve, automatic exhaust method, decontamination device, self-operated flow control valve, and pressure regulating valve. Among them, the excellent performance check valve, self-operated flow control valve, pressure regulator valve and automatic exhaust valve are the main equipment. Keywords: self-operated flow control valve, regulator valve, direct heating

With the continuous development of the national economy, high-rise buildings in various regions have emerged. For the heating of high-rise buildings, the following methods are commonly used: First, a separate boiler and pipeline are set up for the high-rise building to form an independent heating system. This method is safe and reliable, but the initial investment is too large, running. The cost is also high. The second is to set up a heat exchanger for the high-rise building. It also isolates the high-rise system from the low-rise system. This requires high-temperature water or steam source to be economical, so the heat source problem is not solved. If the low-temperature water of the low-zone heating system is used for heat exchange, the heating effect is not good. The third is to use a dual water tank system, that is, to set up two tons or dozens of insulated water tanks and two special water tank rooms in the high-rise building, which not only increases the construction cost, but also starts the high water tank to dissolve in the circulating water. The oxygen is greatly increased, causing oxygen corrosion in the heating system. At the same time, the circulating water flows in and out of the two water tanks multiple times, and the heat loss is large.

"Gas and Heat" published in the 10th issue of 2005, an article "Application of heating equipment for high-rise and low-rise connecting Unicom", the article said "When the pressure in the energy release device rises, its water level rises and the water is automatically drained from the siphon. The pressure relief pipe flows into the lower water well to ensure that the system does not overpressure. "The people who supply heat know that water is a precious resource. As the water in the heating system, it is more valuable after softening, deoxidizing and heating. Therefore, the method described in the article has the disadvantage of wasting hot water resources.

This article describes a method for achieving high- and low-level direct-connected heating using a self-operated flow control valve in series with a regulator valve. This method mainly involves the following equipment: pressure pump, check valve, automatic exhaust method, decontamination device, self-operated flow control valve, rotor pump regulator valve. Among them, the excellent performance check valve, self-operated flow control valve, pressure regulator valve and automatic exhaust valve are the main equipment. As we all know, to ensure the direct connection of high-rise buildings and low-rise buildings, the following problems must be solved:

1. The pressure pump of the high-area heating system can only provide the appropriate flow and appropriate pressure head to the high area, and should not be excessive, and the water grabbing phenomenon in the low area occurs.

2. In the high and low zones, the high pressure in the high zone cannot be transmitted to the low zone, whether it is in the running state or the outage state, which affects the safety of the low zone and causes the low temperature radiator to overpressure.

3, high-zone hot users should be full of water, can not have gas.

The function of the self-operated flow control valve is to ensure that the circulating water volume of the pipeline is constant, and to eliminate excess rich heads while satisfying the circulating water volume.

The function of the pressure regulating valve is: the pressure after the stable valve is the set value. When the pressure after the valve rises, the small valve is automatically closed. When the pressure after the valve rises to the set value, the valve is closed and the valve is maintained. The pressure is constant.

When the system is running, the high-zone pressure pump sends the water supply from the low zone to the hot user in the high zone, and the flow control and constant function of the high-zone heating system through the self-operated flow control valve ensures that the high-zone pressurization pump is incorrect. The occurrence of water grabbing in the low zone occurs; the function of the rich head of the system is automatically eliminated by the self-operated flow control valve, and the circulating water pressure in the high zone is reduced to the safe pressure flowing into the low zone to ensure the safety in the low zone operating state; The essence of eliminating the affluent pressure of the system is to increase the self-resistance of the self-operated flow control valve, which not only keeps the rich pressure in the high zone, but also satisfies the water filling height of the high-area user system. When the system is out of service, due to the static pressure, the water in the high-zone water supply pipe will be closed in the high zone due to the closing of the check valve when it flows back to the low zone; it is also due to the static pressure, the high-pressure return pipe When the water flows to the low zone to increase the pressure in the low zone, the post-valve pressure of the regulator valve will increase instantaneously. When the set value is reached, the regulator valve automatically closes, and the return water in the high zone is also closed in the high zone. In this way, under the cooperation of the pressure pump, the check valve, the self-operated flow control valve and the pressure regulator, a new heating form for the direct connection heating of the high-rise building and the low-rise building is formed.

This method can be used to carry out high and low direct heating. Without changing the operation mode, operating parameters and operating conditions of the original heating system, only a few low-cost heating equipment can be used together to achieve high and low levels. The pressure isolation of the district does not affect each other. Compared with other methods in the past, this scheme has the characteristics of simplicity, economy and practicality.