Consultation on static test issues for flap valves
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During the major overhaul of my unit, I plan to replace several wing valves of type A273-III. I have some questions regarding the static tests and would like to consult everyone on them. 1. When conducting static tests, first determine a certain angle for the flap valve and pour in the standard amount of balancing agent (2.3 KG for type 273). The flap valve should just be able to open at this point. However, in each test, it is not possible for the valve to open exactly when the standard amount of balancing agent is used; there is always some deviation. What range of deviation is considered normal? What are the tolerance standards for other types of flap valves, such as the A168-III type? 2. According to the manufacturer’s technical staff, another method can be used: first adjust the flap valve to a larger angle, then pour in the standard amount of balancing agent (2.3 KG), and gradually reduce the angle of the flap valve until it opens. The angle of the flap valve is then measured. Is this method feasible? Why?
In fact, the weight of the catalyst required to open the flap valve isn’t that strictly regulated; after all, even with high precision in manufacturing, the operating temperature is several hundred degrees, and slight thermal expansion as well as fluctuations in pressure differences can affect the opening and closing of the flap valve. Generally, it’s necessary to measure the installation angle of the flap valve – as long as this angle is within the allowable error range, the weight of the catalyst needed to open the valve won’t differ much. The suggestions provided by the manufacturer are also fine; they are meant for experiments conducted externally. What’s most important is the installation
The purpose of this static test is to verify whether the angle specified by the wing valve manufacturer is acceptable. For this 2.3-kilogram amount, a tolerance of one decimal place (300g) is allowed. In fact, the manufacturer conducts bench tests before shipping the product, and the angles indicated on the flap valve are the results of those bench tests conducted by the manufacturer. The simplest and most effective static testing method: place the catalyst in plastic bags, first weighing enough bags. Fix the flap valve at the angle indicated by the manufacturer, and then pour the weighed catalyst evenly and slowly directly from the upper opening of the flap valve (a balancing agent is preferred). Freshener can also be used). If the valve plate opens prematurely, stop pouring immediately and weigh it ； Or delay opening it, bring in another bag and continue pouring until the moment it is opened; then stop pouring and weigh it. Those with a large error can be processed three times, while those with an error within the acceptable range can be processed in just one go.