Do not touch valves that have not been moved for many years easily

This experience is worth learning from, but if that’s the case, is the design of this valve unnecessary? If it’s not unnecessary, maintenance should be improved so that it doesn’t become unusable only when it’s time to use it.

This is common in older devices, but they still need to be operated when necessary; regular maintenance is also required, and faulty units should be replaced promptly!

Our old installations have many similar problems, such as a large number of pipelines that need to be scrapped and ending up mixed together with the existing pipelines. It can be quite time-consuming sometimes. Some pipelines are never used, but at critical moments they either leak or get clogged. The valves are as the original poster said. This should test the level of management. I think any unnecessary ducts should be removed. Anything that is in use needs to be well maintained. Apply seal oil to the valve screw. Regular maintenance.

The valves must be maintained during each major overhaul; those that are severely corroded or have problems need to be replaced. Additionally, each valve should be greased and operated once. Regarding what the original poster mentioned, it seems there is an issue with equipment management. ;P

Since the valve has been installed in a particular location, it serves a specific functional purpose; rust on the valve stem indicates that proper maintenance has not been carried out, or that problems were not detected in time to allow for replacement of the valve.

In fact, pipeline valves should be maintained regularly; after many years, it’s best not to touch them at all

I’ve encountered similar problems in my workshop as well; it’s due to the aging and detachment at the connection points of the butterfly valve stems, and these are all large-diameter valves. It seems that regular maintenance is very important

It’s worth taking as an example; we encountered a similar situation once. After having the valve open for two years, we tried to close it, only to find that the valve stem had rusted away, and it took a lot of effort to close it.

The loss of the handle is relatively minor; what’s worrying is the loss of the weight.

It seems management needs to be strengthened; regular maintenance is necessary.

It is essential to strengthen regular maintenance to prevent safety accidents!

The valves installed in the system are always in motion, and to avoid the phenomenon mentioned by the original poster, some preparations need to be made in advance. The issue of valve handles falling off, mentioned by the original poster, has also occurred when operating valves in water system pipelines. Upon disassembly and inspection, it was found that the clamps and the bolts used to hold them in place had rusted and come loose. As part of our maintenance work, we replaced all the clamps and bolts for the gate valve handles with those made of stainless steel. From then on, no more mishaps occurred. Additionally, the threads of the door stem should be kept well lubricated. During valve maintenance, it is necessary to carefully check whether the door stem is bent and whether the threads are damaged; if so, they must be repaired before the valve can be reassembled for use. By doing this, I believe that there will be no major problems during operation.

Valve maintenance: To extend the valve’s lifespan and ensure reliable operation. The valve stem threads, which are in constant friction with the valve stem nut, should be coated with a little yellow grease, molybdenum disulfide, or graphite powder to provide lubrication. For valves that are not opened and closed frequently, it is still necessary to rotate the handwheel regularly and apply lubricant to the valve stem threads to prevent seizure. For outdoor valves, a protective cover should be installed on the valve stem to prevent rain, snow, dust, and rust from causing damage. Regularly check and maintain the integrity of the valve’s components. Do not use valves to support other heavy objects, and do not stand on valves. The valve stem, especially the threaded portion, should be wiped regularly, and any lubricant that has become dirty due to dust should be replaced with fresh lubricant; otherwise, it will affect the service life of the valve.

What was said upstairs is correct – there are many valves that aren’t used very often. Although they are operated rarely, they turn out to be essential in special situations such as start-up, shutdown, and testing, and therefore should be regularly maintained. However, we only address the problems once they are detected; regular maintenance of valves is not common.

It’s very useful as a reference; we also have some large valves here that aren’t used on a regular basis, but butter should be applied to them before freezing to prevent difficulties in operating them

Valves require regular maintenance, especially those that are not used under normal circumstances. Furthermore, when designing the process system, it is essential to consider these factors uniformly: use as few valves as possible, minimize the number of valves that remain unused for years, and this will also help reduce pipeline pressure losses.

As the saying goes: It’s easy to conquer a land, but hard to hold it! At the beginning of the design and construction, the valves were installed without any problems! But what’s crucial is the subsequent maintenance and upkeep. A good start alone is far from enough; what we need is a long-term, stable operating condition! Also, this is actually a safety hazard as well; we need to be careful about it

It seems we still need to pay attention to maintaining devices that are used very rarely. We are currently working on a project, and the experience of the above-mentioned colleagues is worth drawing on

It needs to be regularly maintained! For example, during normal operation, the valves can be opened and closed on a regular basis on a small scale (without affecting operational conditions) to carry out lubrication, maintenance, and anti-corrosion measures.