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The sealing performance of liquefied gas valve refers to the ability of sealing parts to prevent medium leakage, which is an important technical performance index of Zui There are three sealing parts of the valve: the contact between the two sealing surfaces of the opening and closing parts and the valve seat; the fitting between the packing and the valve stem and the packing box; and the connection between the valve body and the valve cover The former leakage is called internal leakage, that is to say, the valve is not tightly closed, which will affect the ability of the valve to cut off the medium For block valves, internal leakage is not allowed The last two leaks are called leakage, that is, the medium leaks from the inside to the outside of the valve Leakage will cause material loss, environmental pollution and even accidents For flammable, explosive, toxic or radioactive media, leakage is not allowed, so liquefied gas valve must have reliable sealing performance When the medium flows through the LPG valve, there will be pressure loss (i.e the pressure difference before and after the valve), that is, the valve has certain resistance to the flow of the medium, and the medium will consume certain energy to overcome the resistance of the valve In consideration of energy conservation, when designing and manufacturing liquefied gas valves, the resistance of valves to flow medium should be reduced as much as possible Knowledge of previous valve: introduction to gate valve knowledge of next valve: installation, use and maintenance of liquefied gas valve· Butterfly valve knowledge: test, installation and troubleshooting of butterfly valve 2009-6-5 · characteristics and applicability of solenoid valve 2009-5-23 ·Overview and working principle of steam trap 2009-5-22· General overview of butterfly valve may 21, 2009 Overview of drain valve may 21, 2009
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