Valves with variable widely use it with people's daily life more closely, such as valve useful water taps, liquefied petroleum gas stoves are used in valve. Valve is also part of the mechanical equipment such as internal combustion engines, steam engines, compressors, pumps, pneumatic actuator, hydraulic transmission device for vehicles, ships and aircraft an indispensable.

In recent years, the frequent accidents of safety valve, gas valve and the pipeline valve is gradually recognized by people, such as petrochemical production equipment in the media most has toxic, flammable, explosive and corrosive characteristics, operating conditions and complex and demanding, operating temperature, high pressure, long cycle of the petrochemical enterprises started (more is every two years or three years maintenance overhaul two), valve failure, it lead to leakage of the medium, which pollute the environment and cause economic loss, even lead to device shutdown stop production, and even cause accidents. Small make up from the following points of views.

The use of valve

According to the statistics of refinery engineering, pipeline engineering for the total project 10%~30%, valve costs accounted for the pipeline engineering is the main part of the 30% pipeline engineering equipment, the correct choice of valve used not only to the safe operation of the project on the relationship, but also has a great effect on the device of Engineering economy.

Petrochemical Pipeline with valves usually have a gate valve, globe valve, check valve, safety valve, ball valve, butterfly valve and other valves, also used a few special valve and special valve. Among them, the gate of the largest amount, accounting for about 80% of the total, 10% cut-off valve, ball valve, butterfly valve, the safety valve and check valve.

Selection of materials, mainly steel, accounted for 90%, the rest for alloy steel and stainless steel. In addition to storage and transportation systems engineering, water supply and drainage system, boiler system, self-contained power station system has a large selection of valves, there is a need to explain, there are some differences in product selection scheme and process, data may change, but not the relationship between proportions have too big difference, some technological size difference is bigger, need to non standard valves (i.e. non standard valve, according to the actual use of custom size).

The valve is the valve standard specification design, manufacturing, inspection, use and other aspects of the request, make use of both sides, a common language, to protect their own interests from the technical regulations of the angle, and the judgment with the unified standard. In the past, some small businesses and no quality problems will be put in the first place, the body length of different sizes, the valve material is not standard, the sealing material is poor, causing inconvenience and operation safety risk unit pipeline installation (purchasing carelessness, part of the use of units of the purchase no clear standards, resulting in procurement and supply the loopholes!).

According to small make up experience, there are the following problems at present of the quality of the valve:

(1) the valve casting defects.

The valve body material carbon steel especially chlamydia, burr and tiny crack is easy to appear the body of Cr Mo steel during casting, rough appearance. Run sales outside of the friends all know, when the customer acceptance, tiny trachoma burr will lead to customer acceptance does not pass, a large number of valves and back, many sales do not understand, so what is the relationship between a small trachoma, small glitches, and does not affect the use, is a bit ugly. But the use of units of the experience to tell them, quality not only lies in the valve, more is attitude.

(2) the valve seal

The valve seal is an important index to measure the valve function and quality. Drain valve is the serious problem, threatening the normal operation of the whole engineering devices, and the operation of the valve is difficult to find out whether there is leakage. The cause of most use unit valve inner leakage valve plate, the valve seat sealing surface materials do not meet the requirements, the processing precision is not enough, the valve plate, valve gate valve wedge angle does not match, not a sealing surface width narrow, anastomosis degree difference, the gate is not in place, turn undead and other factors. Also has the packing assembly does not meet the requirements, resulting in leakage.

The use of valve needs

In recent years, with the development of petroleum, chemical industry, smelting industry, all kinds of harsh working conditions, the design of the valve business innovation, to meet a variety of high pressure, high temperature, corrosive conditions, the wear resistance, hydrogen, sulfur demand further.

L. This also indicates that the future direction of the valve industry technology innovation.

Finally, I hope you valve entrepreneurs maintain a vigilance, because we do not merely valve, is safe.