DQ41F low temperature ball valve

Low temperature ball valve is a special ball valve, which is mainly used for fluid control in low temperature environment. The main feature of low temperature ball valve is that it has good sealing performance and low temperature resistance, and can maintain stable performance at very low temperature. In this paper, the structure, working principle and application field of low-temperature ball valve will be introduced in detail.
First, the structure of low temperature ball valve
The structure of the low-temperature ball valve is similar to that of the ordinary ball valve, which is mainly composed of the valve body, valve, sealing ring, valve stem, etc. However, due to the special requirements of low temperature environment, the structure of low temperature ball valve is also different.
1. Valve body
The valve body of the low-temperature ball valve is usually made of stainless steel or low-temperature alloy material to ensure its low-temperature resistance. The internal channel of the valve body is usually spherical to facilitate the flow and control of the fluid.
Step 2: Valve
The valve of low-temperature ball valve is usually spherical, because the spherical valve has the advantages of small fluid resistance and good sealing, so it is widely used in low-temperature ball valve. The material of the valve is usually the same as that of the valve body to ensure its low temperature resistance.
3 Seal the valve
The sealing ring of the low-temperature ball valve is usually made of special low-temperature materials to ensure its sealing performance in the low-temperature environment. Commonly used sealing materials are polytetrafluoroethylene (PTFE), polyether ketone (PEEK) and so on.
4 Stem the valve
The stem of the low-temperature ball valve is usually made of stainless steel or low-temperature alloy material to ensure its low-temperature resistance. The top of the stem is usually equipped with a handle or gear to facilitate operation.
Second, the working principle of low temperature ball valve
The working principle of low-temperature ball valve is similar to that of ordinary ball valve, mainly by rotating the valve to control the flow of fluid. When the valve is rotated to the closed position, a seal is formed between the valve and the seat to prevent the flow of fluid; When the valve is rotated to the open position, the seal between the valve and the seat is broken and the fluid can flow freely.
The sealing performance of the cryogenic ball valve is one of its most important features. In the low temperature environment, the viscosity and density of the fluid will change, so the sealing ring of the low temperature ball valve needs to have good adaptability to ensure its sealing performance in the low temperature environment.
Third, the application field of low-temperature ball valve
Low temperature ball valve is mainly used in low temperature environment fluid control, such as liquefied natural gas (LNG), liquefied petroleum gas (LPG), liquid oxygen, liquid nitrogen and so on. Since the temperature of these fluids is usually below minus 100 ° C, the low temperature resistance of the low temperature ball valve is very important.