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Application of Constant Flow Regulating Valve in Heating Pipe Network
Overview In centralized heating or central air conditioning in circulating water pipe network system, there is a widespread problem of hydraulic imbalance, due to the different resistance and coupling between the various loops of the association, resulting in the flow of transmission and distribution is difficult to balance, regulation Resulting in poor quality of system operation, inaccurate and unstable flow control, unbalanced heat and cold on the client side, forced to adopt large-flow operation, serious energy waste and many other problems. The main reason is not accurate and reliable, easy to use, low cost flow control equipment. Constant flow control valve is designed to overcome the above problems and the development of special control equipment, which can accurately and reliably flow control and transmission and distribution, the eradication of hydraulic loss problems. In central heating or central air-conditioning circulating water pipe network system, the constant flow control valve installed in the client's loop, according to the user's rated flow set the opening, you can achieve the balanced distribution of the entire pipe network system to ensure that System traffic transmission and distribution of balance and stability, improve operational quality, energy-saving operation. No special debugging techniques and instruments, adjust the settings simple, intuitive, fast and reliable. In central heating of a water or central air-conditioning building automation system, equipped with a valve actuator constant flow control valve can ensure that the system flow control stability, accuracy, reliability, improve operational quality and reduce the number of valve actuators and Extend its service life. According to relevant data, it is shown that in the district heating system, a reasonable and balanced transmission and distribution flow can achieve 15-20% more energy saving and coal saving after the hydraulic balance is achieved, which is equivalent to reducing the operating cost per square meter of building area per heating season by 0.5 Yuan or more; due to solve the heating pipe network transmission and distribution of unbalanced problems, so long-term end-user room temperature is not hot, both to reduce user complaints, but also increase the charging rate, but also can give full play to the existing boiler water pump Ability to expand the area of ​​heating and heating, economic and social benefits are impressive. Constant flow control valve Constant flow control valve is a constant flow control valve, which is a self-operated pressure control device and flow control device combination of the valve, the working principle is: with the pressure control device, and control Stable flow control device before and after the pressure difference, so that before and after the valve pressure is greater than the constant current starting value, the flow through the valve no longer with the pressure before and after the change in the pressure control within a certain valve The opening of the flow can be automatically maintained constant flow changes can be achieved by adjusting the valve opening, with the pressure before and after the valve has nothing to do. The same working principle of the valve, some known as "dynamic balance valve", some called "self-flow controller" or "self-flow control (control) valve", they have a certain constant flow function, Range, structure volume, maintainability, materials and prices vary greatly. Beijing Tianjianxing Electromechanical Technology Co., Ltd. developed a constant flow control valve, in 2000 won the Chinese utility model patents (patent number:), in 2001 through the International Patent Cooperation Organization (PCT) international search and international preliminary examination, has been approved for application Germany, the United States and China's invention patents patents, the approval process. Constant flow control valve has the following characteristics 1. The traditional shape, similar to the ordinary control valve. 2. Wide adjustment range, usually 1:10, up to 1:20, fully meet the needs of user regulation. 3 pressure control range, the loss of pressure head up to 45 meters, the minimum is 2 to 3 meters. 4. To take out the way to access the pressure can be "a constant maximum flow function of the pressure control valve" 5. Coaxial internal components can be installed, with a variety of brands of angular travel valve actuators. 6. Sleeve double seat valve, is the first in the world. 7. Metal bellows as pressure sensing components, high reliability, long service life. 8. The upper detachable structure, easy maintenance and cleaning. Selection method Select the nominal diameter of the valve, the first valve based on the construction area, the user's thermal index, pipe network to provide the temperature difference between supply and return data to determine its set flow; then listed in Table 1 Of the flow control range Select the nominal diameter of the valve, pay attention to the valve set flow in the selection of the best flow range to ensure adequate adjustment margin. Due to the wide range of adjustable constant flow control valve, the valve diameter can be selected according to the design diameter, if necessary, reduced diameter. Installation location In the central heating system, installed in the heat exchanger at a water outlet or entrance (Figure a), the implementation of manual adjustment; can also be installed valve actuators, temperature sensors, climate compensators and other self-control instrumentation implementation of automatic Control; in central heating outdoor system, installed in the heat input of the various buildings on the return pipe or water supply pipe; in the central air conditioning fan coil system installed at the floor of the branch and the air conditioning unit coil inlet At the return pipe or water pipe; can also be installed valve actuators with automatic control instrument implementation of the automatic control. In the household control system without temperature control valve installed, it can be installed on the return pipe of each household; in the system of temperature control valve household control, the external connection pressure extraction method (special ordering required) must be installed in each system Heat pipe on the entrance of the building, or on the water supply pipe of the riser pipe sharing the riser pipe. Pay attention to connect the pressure pipe of the outer pipe to the return pipe; install one on each independent ring without the need of repeated series connection. First, adjust the method with a wrench to loosen the hand-wheel under the pressure Lan, the dial to find the flow rate and set the corresponding flow scale value, the valve set to this scale, and then tighten the pressure Lan can be. In the automatic control system, the constant flow control valve can be installed angular valve actuators, automatically adjust the flow. In the household heat metering system, users can independently adjust the opening, change the set flow, can meet different room temperature requirements, but also to achieve behavioral energy savings and reduce heat costs. Technical indicators Working pressure: 0.02 MPa? 0.45MPa; Operating temperature: 4 ℃ -130 ℃; Working pressure: 1.6 MPa; Relative error: 8%; Common failures and troubleshooting Failure performance Possible causes Solutions Specific operation Vibration product Gas exhaust valve shaft pressure Lan loosen, tighten after the water can be. Insufficient flow or draining Rotate the handwheel slightly back and forth until it rotates more than one revolution without jamming; also remove the drain from the lower cover or wire plug. Flow control uncontrolled dirt clogged clean the cover bolts removed, the hand wheel and cover together lift up, clean up after the installation, pay attention to the dial on the valve towards the valve imports, do not install the wrong. Internal parts damaged repair or replacement sent back to my company, the warranty period free repair or replacement. Precautions Pay attention to keep the water clean; pay attention to the direction of the arrow on the valve and the direction of the water flow, not reverse, it is recommended to install according to the following figure.