Description of extended stem low temperature ball valve
Overview of dbv low temperature valve: the valve applicable to medium temperature of - 40 ° C ~ - 196 ° C is called low temperature valve.
Today, the valves mainly described in this paper are low-temperature ball valves, which are mainly used in ethylene, LNG units, natural gas lpglng storage tanks, receiving bases and satellite stations, air separation equipment, petrochemical tail gas separation equipment, liquid oxygen, liquid nitrogen, liquid argon, carbon dioxide low-temperature storage tanks and tank cars, pressure swing adsorption oxygen production and other devices. The output liquid low-temperature media, such as ethylene, liquid oxygen, liquid hydrogen, liquefied natural gas and liquefied petroleum products, are not only flammable and explosive, but also need to be gasified when heating up. During gasification, the volume expands hundreds of times. It is very important for dbv company to select the materials of LNG valves. Unqualified materials will cause external or internal leakage of shell and sealing surface; The comprehensive mechanical properties, strength and rigidity of parts can not meet the use requirements or even fracture. Cause LNG medium leakage and explosion. Therefore, in the process of developing, designing and developing LNG valves, material is the primary key problem. According to our company\'s repeated testing and communication with technicians to solve problems and diversified manufacturing, we have accumulated rich experience, become more and more mature from design, process to manufacturing, and have developed and formed a series of low-temperature valve products.
Other parameters of low temperature valve:The valve body is light and small in size
In order to reduce the heat loss of the valve body, especially to ensure the use of the valve under ultra-low temperature, it is specially designed as a valve body with light weight and small size. The long shaft valve is a valve with low-temperature fluid flowing through. It adopts the form of long stem, which can avoid the effect of external heat and keep the gland at room temperature to prevent the performance degradation of the cover seal. This length is the best length obtained through calculation and test.