1. The brief introduction of valves
The valve is used to control fluid flow, pressure and flow direction of the device. It is the pipeline conveying system control component. The controlled fluid may be liquid, gas, gas-liquid mixture, or solid-liquid mixture. The control function of the valve is to rely on the driving mechanism or fluid to drive the lifting, sliding, swing or rotary movement to change the size of the flow channel area to achieve.
Valves are used in a wide range of applications from the simplest globe valves to all kinds of valves used in extremely complex automatic control systems. Valves and people's daily life have a close relationship, such as the tap water pipe faucet, liquefied petroleum gas stove with pressure relief valve. The valve is also a variety of mechanical equipment such as internal combustion engine, steam engine, compressor, pump, pneumatic transmission device, hydraulic transmission device vehicles, ships and aircraft indispensable parts.
2. The birth of the valve
As early as the end of the Warring States Period, in order to make salt by sucking brine from salt wells, people made the most primitive plunger valve to prevent brine leakage. In Egypt and Ancient Greece, after the development of complex hydraulic systems, valves were upgraded to plug and plunger valves. They can prevent the flow of water against the current. By the Renaissance, the famous engineer Da Vinci designed ditches, irrigation projects and other large-scale hydraulic system projects in the use of valves. The development of the valve industry has made a great contribution.
In 1769, Watt invented the steam engine so that the valve formally entered the field of mechanical industry, steam engine on a large number of plug valves, safety valves, check valves and butterfly valves.
From the 18th century to the 19th century, the promotion of steam engines in mining, smelting, textile, machinery manufacturing and other industries has been very rapid. It increased the number and quality of valves, so the slide valve appeared. The globe valve with threaded stem and the wedge gate valve with trapezoidal threaded stem appeared successively, which is a major breakthrough in the development of valves. The emergence of these two types of valves not only meets the requirements of various industries for increasing valve pressure and temperature at that time, but also initially meets the requirements for flow regulation. Since then, the rise of electric power, petroleum, chemical industry, shipbuilding industry, a variety of high pressure valves have been developed so rapidly.
After the Second World War, due to the development of a variety of special materials, including polymeric materials, lubricating materials, stainless steel and cobalt-based carbide, the old plug valve and butterfly valve received new applications. According to the evolution of the plug valve ball valve and diaphragm valve has been rapidly developed. Globe valves, gate valves and other varieties of valves increased and the quality was improved. The valve manufacturing industry has gradually become an important sector of the machinery industry.
3. The development of the domestic valve industry
In the 1970s, with the expansion of industrial production scale, some large petrochemical enterprises introduced the equipment and also introduced some control valves at the same time. Manufacturers pointed out the direction of development for the domestic control valves.
In the 1980s, with the implementation and implementation of China's reform and opening up policy, the valve manufacturing technology and product quality rapidly improved. The production of various types of sleeve valves, eccentric rotary valves began to develop fine small regulating valves.
In the 1990s, there was an era of rapid economic development. At the same time, China's regulating valve industry also began to introduce and digest foreign advanced technology, filled the gap of some special industrial control, improved the level of China's regulating valve industry and shortened the gap with foreign countries.
With the development of modern nuclear industry, petrochemical industry, electronic industry and aerospace industry, as well as the process of automatic control and long-distance fluid transport development, these industries promote the development of modern low-temperature valves, vacuum valves, nuclear industry valves and various regulating valves. Valve actuation devices for remote control and program control are increasingly used.
4. The development of valves
Since ancient times, the valve has witnessed the changes of the times. At the same time, the times also witnessed the valve from less to more, from simple to complex, from shallow to deep development process.
Today, China's various large and medium-sized valve enterprises are about 6000. Small valve enterprises are countless. Stunt valve groups have a remarkable achievement in the long distance. There is a valve industry rise in both pump station and water pipe network to solve the water hammer and water loss of equipment and package.
Our Landee Valve will continue to uphold the business purpose and concept of the enterprise, with the company's integrated supply capacity, qualification, strength and quality reputation to explore more industries and markets, so as to serve and meet more customers' needs.
