Control valve factory inspection, mainly static characteristics of the test, including the basic error, the rated stroke deviation, backlash, start and end deviation, dead zone, repetitive error, tightness, leakage, etc., which are in no-load In fact, they are the result of measuring the valve on the workbench, but the result is hard to tell what kind of performance the valve will show under actual operating 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 tests conducted by researchers and manufacturers prove that up to 50% of the regulating valves, many of which are selected by considering traditional factors, do not have much of an effect on optimal control loop performance. 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 greatly increase production efficiency and reduce waste, resulting in significant economic benefits. Obviously, this economic efficiency makes it entirely possible to deny the traditional approach, that is, only based on the initial purchase price of the valve to decide whether to buy. Second, the conventional wisdom has always been that improvements in process optimization always come from upgrades in control room control instrumentation. However, the test data shows that the dynamic characteristics of the valve can have a significant impact on circuit performance with the same control instrumentation. If the accuracy of the control valve can only be as low as 5%, it can not do much to spend a lot of money configuring an advanced control instrumentation system with a control accuracy of up to 0.5%. When looking for a valve that matches your application, consider the four basic types of throttling control valves, cage ball, rotary float, eccentric and butterfly valves. Cage ball valves are available in a wide variety of trim forms to meet the needs of most applications, making them the first choice of any valve. There are many kinds of cage ball adjusting pieces, including balance adjusting piece, unbalance adjusting piece, elastic seat adjusting piece, constrained adjusting piece and full size adjusting piece. In many cases, the various trim configurations of a valve body are interchangeable. Cage ball valves also have several disadvantages. First, the size of the valve is limited (usually 16 inches); second sight valve with the same specifications (such as float valve or butterfly valve) compared to its capacity is relatively low; third is the higher price, especially large Cage ball valve. However, cage ball valves have excellent performance, often enough to compensate for these drawbacks, in reducing process variability. Rotating float valve flow than the same diameter cage valve larger. Although the control range of the rotary float valve is larger than the cage ball valve, it is still superior to most other types of valves. Rotary float valve allows the pressure drop and allowable temperature range smaller than the cage valve. Normally their pressure drop is limited to 7.0x105kg / m2, suitable for use at temperatures below 398 ° C. Float valves are not suitable for liquids that can be vacuoles and often give higher noise when used in gases with higher pressure drops. Eccentric valve friction than the smaller ball valve, the price is lower. Unique structural design makes it more precise for the control of process variability. This is evident from Fisher's new BV500 product. In addition, the advantages and disadvantages of eccentric valve float valve is not much difference. By valve performance to measure, the butterfly valve is a low-end valve. Butterfly valve flow, the cheapest price, but there are many different caliber. However, the butterfly valve characteristic curve is only a proportional curve, which greatly limits the butterfly valve to reduce flow variability performance. For this reason, the butterfly valve can only be used in fixed load situations. Although butterfly valves are available in a variety of different caliber and can be made from most cast alloys, butterfly valves do not meet the ANSI requirements for face-to-face dimensions and are not suitable for fluids or noises that are subject to cavitation . In summary, the dynamic characteristics of the control valve and static characteristics are actually as important, or even more important than the static characteristics, because it is more able to determine whether this valve to adapt to field conditions, so as to select more suitable for field work Condition control valve to come, which requires close communication between manufacturers and users to achieve.
Power Company adopts various special glue stock made in USA and Germany to manufacture industrial robber rollers. For printing industry, there are alcohol plate moisturizing rubber roller, UV inker, rubber roller transmitting and sparing ink. For plastic, composite membrane, textile, printing, tin plate printing, food, wood, hollow glass and deep processing of iron and steel, we provide special purpose glue stock with unique performance of high temperature resistance, acid and alkali resistance, organic solution resistance and abrasion resistance.
With the attitude of being professional and sincere, Power Company produces high-quality rubber rollers closely following sci-tech requirement of the times. You can be assured that each product is of reliable quality, for we are extremely strict with the production processing of rubber roller. Various working procedures have been added to ensure most reliable quality.
With the tenet of quality first, clients the highest, Power Company provides to you all-round services of rubber rollers, e.g., re-rubbering of shabby rubber rollers, mapping and manufacture of new base gum and corollary services for equipment manufacturers.
Industrial Rubber Roller
Industrial Rubber Roller,Rubber Roller Used In Industry,Small Rubber Roller,Industry Silicone Rubber Roller
Jinan Power Rubber Roller Equipment Co., Ltd. , https://www.powerrubberrollers.com