Principle of ultra-low temperature valve: for valves applied under ultra-low temperature conditions, the medium temperature is very low, and the metal materials will suffer from low-temperature cold brittleness. The strength and hardness will be greatly improved, and the plasticity and toughness will be greatly reduced, which will directly affect the performance and safety of the valve. If an ordinary valve is used, the low temperature will freeze the packing in the valve stuffing box and cannot play a sealing role. In this way, what the valve needs to lengthen is the length from the seal seat on the valve cover to the bottom of the stuffing box. With sufficient isolation space and heat dissipation distance, the cryogenic medium in the valve body will not freeze the stuffing.

Advantages of stainless steel pneumatic butterfly valve
In recent days, hot weather has appeared in many places. Here, Xingda in Jingxian County reminds everyone to pay attention to high temperature heatstroke prevention. Although the weather is extremely hot, the workers in Jingxian Xingda can't stop their work for a moment. As the peak season of pipe fittings comes, there are a large number of orders every day for products sold at home and abroad. Jingxian Xingda mainly consumes high-pressure rubber hose, pneumatic butterfly valve, expansion joint, compensator and other pipe fittings. With many years of technical experience, pneumatic butterfly valve is a relatively common pipe fitting product. Recently, many customers have inquired about pneumatic butterfly valve. I also appreciate the support of new and old customers for Jingxian Xingda. Here, I would like to talk about the advantages of pneumatic butterfly valve:
1. From the appearance, the stainless steel corrugated hose made of good stainless steel (304 material) is bright in color and will not be blackened. 2. Confirm that the corrugated hose (304 material) is bent when holding the waste product. The good stainless steel plate has good flexibility. 3. The steel wires on the wire mesh sleeve are arranged uniformly and will not be fried. Broken wires should not exceed four. 4. It is a simple way to use a magnet to suck. The real stainless steel (304) will not be sucked. Stainless steel pneumatic butterfly valve has the advantages of high temperature resistance, low temperature resistance, acid and alkali resistance, mainly because the raw materials of stainless steel hoses are all 304 stainless steel, and the basic alloy elements of stainless steel, including nickel, molybdenum, titanium, niobium, copper, nitrogen, etc., to meet the requirements of various uses for the structure and performance of stainless steel. The stainless steel pneumatic butterfly valves consumed by Jingxian Xingda are all made of 304 stainless steel. The pneumatic butterfly valve is a soft connection of commonly used pipe fittings, which has many advantages. The central government can contact Jingxian Xingda at any time for customers' needs. We answer your questions with professional knowledge, and we are very grateful for the support of new and old customers.
Shanghai Pneumatic Butterfly Valve Introduction Classification and Connection Mode of Pneumatic Butterfly Valve
Pneumatic butterfly valve is a kind of high-quality flexible pipeline in modern industrial pipeline. It is mainly composed of corrugated pipe, mesh sleeve and joint. Its inner pipe is a thin-walled stainless steel corrugated pipe with spiral or annular waveform, and the outer mesh sleeve of the corrugated pipe is woven by stainless steel wire or steel strip according to certain parameters. The joints or flanges at both ends of the hose are matched with the joints or flanges of the customer's pipes.
Generally, pneumatic butterfly valves can be divided into three lengths: the first is the tightening length, that is, the length when the hose is tightened to the limit position; The second is the length of the device, which is the length of the hose when it is in the middle of half of the maximum displacement; The third is the stretching length, which is the length when the hose is stretched to the maximum limit. When installing the hose, the hose should be in the middle position, which is called the length of the device. Under the device state at this position, when the hose is subjected to axial load, it can move in two directions. Otherwise, if it can only move in one direction, it will affect the strength of the pneumatic butterfly valve and reduce its service life. In the process of implementing the device, considering that using a ruler to measure the length of the hose according to the calculation results and then stopping the device may affect the consumption efficiency, some foreign consumers directly install the ruler on the hose and cut off the ruler after installation.
Pneumatic butterfly valve: it needs flexible conduit to avoid vibration. It can be used in steam, gas, air, heavy oil, petroleum, chemical industry, etc. For detailed selection, refer to the corrosion resistance parameter table of hose material machine and the nominal diameter and pressure gauge of corrugated pneumatic butterfly valve, Please refer to the correct application and installation method of pneumatic butterfly valve and the optimal length of hose for settlement compensation.
Classification and connection mode of pneumatic butterfly valve:
1、 Universal corrugated pneumatic butterfly valve
1. Receiving corrugated pneumatic butterfly valve
Product model: HXJR pneumatic butterfly valve
Nominal diameter: DN6 ～ DN800
Working pressure: 0.6~12.5 (MPa)
Connection mode: RX21