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Alice Campos Valves April 14th, 2019 - 12:17:48
Ball - the heart of the valve. Leading manufacturers attach great importance to the quality of the surface of ball valves. Brass Balls are diamond grinding, they applied anticorrosion coating of nickel or chromium. As a result, the ball gets a perfect mirror surface. Symptom of products of low quality - a dim, muddy or rough surface of the ball.
Zhejiang Relia Valve Co. is a high quality valve manufacturing company based in China. All our products are manufactured carefully and are tested in accordance with relative standards before delivering. Our featured products include API 600 cast steel wedge gate valves, cast steel globe valves, cast steel check valves, trunnion ball valves, floating ball valves, fully welded ball valve, forged steel valves, wafer check valves and many other valves that are perfect for your industry.
With the increase of the steam flow rate and pressure, the plug valve can not satisfy the number of steam admission and exhaustion at all. In order to solve the problem, people then invented the slide valve. In 1840, the check valve with threaded stem and the wedge gate valve with threaded stem become the great 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 need for flow regulation. Later, because of the rapid development of power industry, oil industry, chemical industry and shipbuilding industry, all kinds of high or middle valves sprang up like mushrooms. What's more, after the Second World War, owning to the invention of new materials such as polymeric material, stainless steel, lubricating material, the old plug valve and butterfly valve gain the new application and the ball valve and diaphragm valve develop quickly.
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 usually is composed of body, seat, bonnet, parts 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 area of the flow passage.
An innovative manual pinch valve designed to meet the needs of industry, is one developed for the output of finely granulated materials, in particular dry lime mud. This specific material contains a dry matter content level of 65 to 90%. A manual operated sleeve valve is composed of an elasticized inner tube within a pressure chamber and can be used as an outlet from the pressurizing process. The material processing is by use of a control pinch valve and a sluice feed which is used to ensure a pressure lock. The sluice feed provides a designated minimum height of material within the valve. The establishment of a tightly packed line of finely granulated material in the valve provides a significant drop in pressure which acts as a pressure lock.
There is a slight flaw with valves though. The valve combination of 2-3 will be slightly sharp, the 1-3 combination will always be quite sharp, and the 1-2-3 combination will always be very, very sharp. Lets explore why this phenomenon happens.