Common use problems of cryogenic valves and misunderstandings

Low temperature valve overview:
A cryogenic valve is a valve that can be used under low temperature conditions. A valve that operates at temperatures below -40 °C is often referred to as a cryogenic valve. Cryogenic valves are one of the most important equipments in the petrochemical, air separation, natural gas and other industries. The quality of their products determines whether they can be produced safely, economically and continuously. With the development of modern technology, the use of cryogenic valves is becoming more and more widespread and the demand is increasing.
For temperatures above -50 ° C, long neck structures are generally not used. For ball valves with temperatures below -50 ° C, neck length T is determined according to the design and calculation of Yijie Valve Company. Low temperature ball valves are mainly used to output liquid cryogenic media. Ethylene, liquid oxygen, liquid hydrogen, liquefied natural gas, liquefied petroleum products, etc., are not only flammable and explosive, but also vaporize when heated, and expand by several hundred times when gasified.
The material of the LNG valve is very important. If the material is unqualified, it will cause leakage or leakage of the casing and sealing surface. The comprehensive mechanical properties, strength and rigidity of the parts can not meet the requirements of use or even break. Causes leakage of LNG media to cause an explosion. Therefore, in the process of developing, designing and developing LNG valves, material is the primary key issue. The valve body and bonnet are: LCB (-46 ° C), LC3 (-101 ° C), CF 8 (304) (-196 ° C).
The low temperature valve needs to adopt the long neck valve cover structure, which is to reduce the heat in the external afferent device; ensure that the temperature of the stuffing box is above 0 °C, so that the packing can work normally; prevent the stuffing box from being too cold. The valve stem at the stuffing box and the parts above the bonnet are frosted or frozen.
The design of the long neck valve cover is mainly the design of the neck length L. L refers to the distance from the bottom of the stuffing box to the upper surface of the upper sealing seat. It is related to the thermal conductivity of the material, the heat conduction area, the surface heat dissipation coefficient, the heat dissipation area and other factors. The calculation is cumbersome and generally obtained by experimental methods.
The working conditions of the low temperature valve are harsh, and most of the working medium is flammable, explosive and highly permeable. The low working temperature of Zui can reach -269 °C, and the high working pressure of Zui is 10 MPa. Therefore, the design, manufacture, and inspection of cryogenic valves are quite different from those of general-purpose valves.
Yijie Valve has been inspirational to do everything, we encountered many customers in the sale of misunderstanding of the low temperature valve will think of writing a middle article. Many customers directly consider the valve material to be a low temperature steel. It is not a low temperature valve. In fact, it is only a semi-finished product of a low temperature valve. Because it has not been subjected to cryogenic cryogenic treatment, it can be said that cryogenic cryogenic treatment is the crowning touch of low temperature valves. The key to the low temperature valve is to use cryogenic treatment, so as to ensure that the various parameters of the low temperature valve meet the requirements, especially the expansion coefficient, so as not to cause various valve jams in use. Sometimes considering the price issue, we must also consider the quality of the valve. Cryogenic valves are special valves.

In fact, most of the domestic low-temperature valves are not subjected to low-temperature cryogenic treatment. *The cost will be expensive. Here I can give you a rough calculation. If you add a set of cryogenic equipment, the cost is high, and the cryogenic equipment is expensive. In addition to the necessary material, cryogenic cooling is a bad storage medium. There is also a lot of liquid nitrogen consumed in processing a valve, and the price of liquid nitrogen is not cheap. Our factory has special low temperature treatment on the produced low temperature valve, and put the rough processed parts in the cooling medium for several hours (2-8 hours) to release the stress, ensure the low temperature performance of the material, and ensure the finishing size to prevent When the valve is in a low temperature condition, the low temperature valve is leaked due to deformation caused by temperature changes.

The cryogenic valve inquiry is enough to pay attention to the facts:
In order to make the cryogenic valve better meet the customer's requirements, if you need a low temperature valve, please provide the specific parameters you know.
1. The name of the low temperature medium
2. Temperature of low temperature medium
3. You need to customize the length of the long neck of the cryogenic valve that you want, not to provide the standard according to our Yijie valve.
4. The material of the low temperature valve (can be customized according to customer requirements)
5. Cryogenic valve pressure
6. Sealing of low temperature valves (soft or hard)
7. Connection method (flange connection or welding)
8. Drive mode (manual, pneumatic, electric)
9. Delivery time, etc.

Yijie people will always adhere to the corporate policy of “all-round adaptation and market satisfaction”, abide by the corporate philosophy of “honesty, pursuit of excellence”, carry forward the enterprise spirit of “unity, forge ahead, seek new and pragmatic”, make unremitting efforts, double struggle, and be new Old customers provide newer and better products and services. At the same time, they are also eager to get the care and support of our customers, peers and friends. The corporate culture of “I am attentive, you are at ease” inspires all Yijie people.

Toilet Cleaner

Toilet Cleaner,Toilet Bowl Cleaner,Toilet Cleaning,Toilet Cleaning Powder

Wuxi Keni Daily Cosmetics Co.,Ltd , https://www.kenidailycosmetics.com