Liquefied gas valve, also called sectional door, is the most widely used type of valve. Its popularity is due to the fact that the friction between the sealing surfaces during opening and closing is small, more durable, the opening height is not large, and manufacturing is easy. Easy to maintain, not only for medium and low pressure, but also for high pressure. The following small series introduces the use of liquefied gas valves and the main characteristics of liquefied gas. Liquefied gas valve installation 1. The inner cavity of the liquefied gas valve should be cleaned before installation and the defects caused during transportation should be removed; 2. Liquefied gas valve installation should maintain the horizontal state of the butterfly valve drive shaft and the vertical position of the piston valve; 3, before the use of liquefied gas valve to deal with the transmission device to debug, keep the transmission device functions intact, limit travel and over torque protection and control; 4. Lubricate all the lubrication parts of the liquefied gas valve transmission before commissioning. 5. Before starting the electric device, read carefully the manual of the electric device of the liquefied gas valve provided. Liquefied gas valve use method 1. The special valve cavity must be cleaned before installing the valve, and the defects generated during transportation should be clearly understood to avoid the influence of these defects on the normal operation of the valve. 2. Install the liquefied gas valve in a place that is easy to maintain and install it on a horizontal pipe. 3. When the liquefied gas valve is installed, first open the channel pipe next to the rice to clear the condensate and other mixture in the pipe. 4. Liquefied gas valve is a kind of sealed valve, so when we close the valve, we must take a certain pressure on the valve flap, and apply pressure to force the seal without letting it leak. When the gas enters the valve, the force of friction between the valve stem and the gas and the thrust generated by the medium entering the valve is the resistance to overcome when the gas enters, so the diameter of the valve should be large enough. The main characteristics of liquefied gas 1, flammable and explosive. There is a greater risk of fire and explosion accidents than oils and natural gas such as gasoline. Liquefied gas reaches a certain concentration in the air. Even in a cold area, small sparks emitted when an electrostatic or metal impact is encountered can rapidly cause combustion. If the concentration of liquefied gas plus air is 2-10%, it will cause an explosion. 2. The ratio of gas to liquid volume is large and volatile: under normal temperature and pressure, liquid liquefied gas is rapidly vaporized into 250--350 volumes of liquefied gas. 3, the proportion of liquid is lighter than water. Like oil, it floats on the water, which is about half as much as water. 4. The proportion of gaseous matter is heavier than air, which is approximately 1.5 to 12 times the specific gravity of air. Therefore, the leakage of liquefied petroleum gas easily deposits in low-lying areas, causing burning and explosion accidents. 5, large volume expansion coefficient. The volume expansion coefficient of liquefied petroleum gas is approximately 10 to 16 times the volumetric expansion coefficient of water at the same temperature. As the temperature rises, the liquid volume will continue to expand, the gaseous pressure will also increase, and the temperature will increase by 1 degree Celsius per volume. Expansion 0.3 to 0.4%, pressure increase 0.2 ~ 0.3MPa. 6, low boiling point. The general boiling point is below 0°C. In China, especially in the south, even in the coldest temperature conditions in winter, it can be naturally gasified. 7, the flash point is low. Below 28°C, the minimum combustion temperature for the formation of a volatile gas mixture is called the flash point, and flash point-prone combustion only occurs instantaneously with flashes or flashes. The flash point is a precursor to fire. 8. Corrosiveness: The corrosiveness in liquefied gas is mainly a small amount of sulphide. It has a slight amount of corrosiveness to steel equipment and has a melting effect on rubber. 9, odor: liquefied gas no special odor, in order to easily detect the leak, in the liquefied petroleum gas add ethane thiol and other additives odor. 10. Poisoning and suffocating: LPG has low toxicity. When the concentration of liquefied petroleum gas in the air exceeds 1%, it will cause people to vomit and feel headache; when they reach 10%, they will be anesthetized in two minutes. When the human body inhales a high concentration of liquefied petroleum gas, suffocation death occurs. Editor's summary: The use of liquefied gas valves and the main characteristics of liquefied gas are introduced here, and we hope to help everyone. If you want to know more related information, you can pay attention to this website information. Curtain installation method
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