Brief introduction of several special purpose gas valves
The gas valve is a new type of safety supporting device for gas pipeline engineering; it is used to cut off, connect and adjust the gas in the pipeline, and has good control characteristics and closing sealing performance; it is suitable for city gas, liquefied petroleum gas, natural gas, Oxygen and other gas medium pipelines. Guangdong Jinshang Intelligent Electric Co., Ltd. was founded in 2011 and is located in Zhongshan District, Guangdong. It is a high-tech enterprise integrating R&D, production and sales. With its professional level and patented technology in series gas valves, the company is rapidly developing in the field of series gas valves. rise. Today, I will briefly introduce several special-purpose gas valves:
1. Gas check valve. The compressor of the gas storage and distribution station often needs to be equipped with a check valve to prevent the gas from flowing back into the compressor. The water check valve has been eliminated in the gas industry. The main disadvantage of the general gas check valve is that the valve plate vibrates with the reciprocating motion of the compressor, and the collision with the valve body produces a loud noise, which is easy to damage the valve plate; the second is the sealing Bad sex.
2. Emergency shut-off valve for pressure regulator. The emergency shut-off valve for the pressure regulator is an important safety protection device in the gas transmission and distribution system. The emergency shut-off valve is an emergency release mechanism installed on the upper or side of the shut-off valve. It is also connected to the body of the regulator as a whole, and it is also connected to the filter as a whole. Its function is to cause overpressure or After the pressure is lost, the gas source is shut down urgently to ensure safety. The large-scale use of natural gas in cities has increased the pressure rating of the pipeline network, and the failure of the regulator will bring disastrous consequences to the city, and the domestic gas industry is paying more and more attention to this. The domestic selection of products has not yet formed a certain trend. Imported, joint venture, and domestic products are indistinguishable from good and bad. Careful selection is required. RAQ series gas emergency shut-off valve is integrated with the filter, with novel and compact structure and high sensitivity. User safety.
3. Gas emergency shut-off valve. In the event of gas leakage or other disasters in gas boilers, gas air conditioners, and gas equipment, the emergency shut-off valve quickly cuts off the gas source to prevent the expansion of the disaster. At present, the gas emergency shut-off valve has not been popularized in China. With the strengthening of environmental protection awareness and safety awareness, as well as the development of the gas business, the gas emergency shut-off valve will definitely get people's attention. The gas emergency shut-off valve is a valve that guarantees safety. It is connected to the automatic monitoring equipment and executes the valve closing command. Therefore, the gas emergency shut-off valve is an electric valve. According to the existing data, there are two types of such valves, one is electromagnetic Valve, one type is electric valve. Due to the high requirements of gas emergency shut-off valves, mainly fast, tight, small flow resistance, and safe diameter, the existing solenoid valves and electric valves have certain defects and cannot meet all their requirements. The following is an analysis of these valves one by one:
1. Solenoid valve. At present, most of the imported solenoid valves are used. The solenoid valve has a fast speed, but the flow resistance is large. It is the largest flow resistance in the globe valve, the pressure loss is large, and the diameter is small. It is difficult to manufacture large-diameter solenoid valves. Generally, it can only be made below DN150. Expensive, such as equipped with a large-diameter solenoid valve to meet the diameter requirements, the technical and economic ratio indicators are very poor. Some solenoid valves rely on the electromagnetic field to attract and open the valve. Once the power is lost, the valve will be closed even if the power is lost instantly, which is not in line with the actual working conditions. Decoupling solenoid valve, energized decoupling and closing valve, high sensitivity and fast speed, because low DC voltage is used, a little interference or power "shake" will cause malfunction, affecting normal life and production;
2. Electric butterfly valve. The price is low, it is easy to make a large diameter, the opening and closing speed is faster than that of the gate valve, and the opening and closing speed is slower than that of the solenoid valve; the flow yin is smaller than that of the solenoid valve and larger than that of the gate valve; The speed impact of rapid opening and closing is easy to cause insufficient opening or closing;
3. Electric gate valve. The price is higher than that of the electric butterfly valve, the flow resistance is small, and the sealing performance is good, but the speed is slow and cannot meet the requirements of emergency cut off;
4. Ball valve. The flow resistance is small and the sealing performance is good, but the opening and closing speed of the domestic or imported electric ball valves on the market is generally 15-30 seconds, which cannot meet the fast requirements. Electric ball valve has many advantages, as long as the opening and closing speed is improved, it can become an ideal emergency shut-off valve.
The emergency cut-off electric ball valve combines the advantages of the ball valve. The opening and closing speed reaches 3.75 seconds, which fills the gap at home and abroad. Moreover, the structure is designed with anti-static and fire-proof functions. The electrical equipment can be connected to the gas leakage alarm and disaster control equipment. It can also be connected with auxiliary equipment such as fans. The overall design conforms to DBJ08--65--97 "Technical Specification for Urban Natural Gas Pipeline Engineering" and the price is much lower than that of similar imported products. As soon as it came out, it was accepted by gas users and received high praise.
Guangdong Jinshang Intelligent Electric Co., Ltd. has continuously reformed and innovated on the basis of fully introducing and absorbing foreign advanced technology, and has successfully developed and produced valve series products for the core system of gas appliances, which are widely used in outdoor ovens, heaters, wall-hung boilers, gas appliances, etc. at home and abroad. On many products such as ovens, the company has always implemented the IS09001 quality management system and strictly implemented the "7S" management standard.