State valve pump summary valve selection matters needing attention

The first valve from the current nearly 4,000 years of history. According to historical records, in ancient times, when brine was salted from salt wells, it was once used in bamboo pipelines. In 1800 BC, the ancient Egyptians in order to prevent the proliferation of the Nile River and the construction of large-scale water conservancy project is also used a similar wooden cock to control the distribution of water. These are the original origin of the valve. With the European Industrial Revolution, a great deal of industrial valves were used after the invention of the steam engine from Watts. The beginning of the 20th century in the world began to cast steel, forged steel and forged welding valves. Then there is the beginning of a stainless steel valve, plastic valves, valves and other fluorine-lined various materials and various functions of the specific differentiation valve. Now the type of valve has been able to reach nearly ten thousand kinds of size types. With the process requirements increased, the control of the fluid is also getting higher and higher, which means that the valve on the fluid control requirements are also higher and higher, from flow control, pressure control are upgraded to the new precision. Over the years, people have considered a number of traditional factors when choosing a control valve, such as pressure ratings, pressure drop, flow media, temperature, and cost. However, the situation has changed dramatically in the past 10 years and much progress has been made in valve design, and the cost-effectiveness of the manufacturing process is quite different from what it was before, making many of the more traditional factors that have to be taken into account before choosing a valve The importance has been greatly diminished. The key to choosing a valve is to evaluate the dynamic rather than static characteristics. Summary of the latest valve selection key issues: 1, the valve dynamic characteristics of the valve selection is the focus: Although some traditional factors are still important, but they are only biased in favor of the valve "static" performance. In fact they are the result of measuring the valve on the "workbench," but the result is hard to say what kind of performance the valve will behave in real-world conditions. Traditionally, it has been suggested that careful adjustment of the static factor will give the valve (and hence the entire circuit) good performance. However, we now recognize that this is not always the case. Thousands of performance checks by researchers and research institutes at Nobuname show that as many as 50% of valves in service, many of which are selected by considering conventional factors, have failed to optimize the control loop performance Produce how much effect. Subsequent studies have shown that the dynamic characteristics of the valve play a very important role in reducing process variability. In many key processes, different valves reduce process variability by a factor of 1 to dramatically increase productivity and reduce waste, resulting in more than $ 1 million in economic benefits. Obviously, such economic benefits make us can completely deny the traditional approach, that is, only based on the initial purchase price of the valve to decide whether to buy, not fully consider the network of valves to achieve different results.