November 4, 2021
A valve is a device which controls the flow rate, pressure or the direction. The controlled fluid can be the liquid, gas, the mixture of gas and liquid or the mixture of solid and liquid. The valve commonly is composed of physique, seat, bonnet, components for opening or closing, actuating device, sealing element and so on. The controlling function of the valve depends on the actuating device or the movement of the fluid which drives the sliding, rotating or turning of the parts for opening or closing to change the region of the flow passage.
Two thousands years ago, the Chinese people applied the bamboo trunk and wooden plug into water pipeline. Then later they applied the sluice into the irrigational canal, the plate verify valve into bellows for smelting and so on. With What is Control Valve of smelting procedure and hydraulic machinery, the plug valve produced of brass and lead appeared in Europe. Besides, with the wide application of boiler, in 1681 the safe valve with lever and heavy bob came into the globe. Prior to the invention of the Watt steam engine, the plug valve and check valve were the most critical valves. The steam engine leaded the valve into a new field namely mechanical industry.
With the increase of the steam flow price and pressure, the plug valve can not satisfy the quantity of steam admission and exhaustion at all. In order to solve the trouble, folks then invented the slide valve. In 1840, the verify valve with threaded stem and the wedge gate valve with threaded stem grow to be the wonderful breakthrough in the valve field. The two valves did not only meet the requirement for pressure and temperature at that time but also initially satisfy the want for flow regulation. Later, because of the rapid development of energy industry, oil sector, chemical market and shipbuilding sector, all types of higher or middle valves sprang up like mushrooms. What’s additional, right after the Second Planet War, owning to the invention of new materials such as polymeric material, stainless steel, lubricating material, the old plug valve and butterfly valve acquire the new application and the ball valve and diaphragm valve develop swiftly.
All in all, step by step the valve manufacturing becomes one particular of the crucial sectors in the mechanical industry. There are a lot of applications for the valve. It is closely connected with our each day life. For example, the tap used for operating water pipe and the reducing valve applied for liquefied petroleum gas stove are the valves. What’s much more, it is the crucial part for distinctive mechanical equipments such as gas engine, steam engine, compressor, pump, vehicle, ship or aerocraft.
