Can an automatically regulating valve for instruments be used as a manual valve?

The connection might be difficult! The valve core should be fine.

First and foremost, I’m telling you clearly that it’s not allowed. Why is the manufacturing technology for many high-end valves in the hands of countries such as Germany and the United States? In industrial operations, there are rules to follow; one must operate strictly according to those instructions and not ignore any minor issue. Even tightening bolts requires considerable expertise – just grabbing a wrench and twisting it hard doesn’t mean you’re the best at it. There are 2 issues you need to consider here: 1. Even if you can actually remove the actuator and such, then when you install a handwheel, do you know how to do that? Should the bracket be removed? If so, what type of balancing fixture should be installed in its place? And once that fixture is in place, will it be completely perpendicular to the valve stem? 2. Once everything on this is completed, you need to know how to adjust the flow rate/pressure/temperature – which screw to turn. If that’s possible, there’s no need to spend a lot of money on an automatic control valve. Control valves are an important component in automatic control systems. During the automatic control process, the control of many continuous production processes ultimately comes down to regulating the flow rate through control valves; in other words, the control valve is the key component that carries out the control commands to complete the control tasks. Therefore, the performance of the control valve is directly related to the success or failure of the entire control system. Unfortunately, control valves are often overlooked in practical use; people tend to consider them to be simple mechanical components that don’t deserve as much attention as the instrument itself.

What was said upstairs is a bit exaggerated! The original poster is referring to special situations, and of course special treatment can be given in such cases: first of all, without spare parts, the automatic control valve cannot adjust automatically ； Secondly, as can be seen from the description, the process allows for manual control ； Once again, a handwheel is available conditionally. It is generally very difficult to install hand wheels on valves with a straight stroke; this is only possible for valves that rotate around an axis, such as ball valves and butterfly valves. Since the poster mentioned cylinders, it is more likely that ball valves or butterfly valves are involved. So, by simply removing the actuator, it can be used as a manual valve! Why install a handwheel? It can be adjusted manually using a wrench, but this makes it more labor-intensive for the operator. Correcting the original poster’s concept: the cylinder is part of the actuator. Don’t get it mixed up.

I think it’s possible. The steam control valves we use now come with handwheels; these handwheels are already installed on the valves at the time of production, not added by us later. There is a clip in the position of the handwheel, and once the handwheel is adjusted to the desired position, automatic regulation stops working, and manual adjustment is required instead. Only when it is set to the automatic mode can automatic regulation take effect. Control valves come with this functionality right from the factory, so I believe that as long as the necessary conditions are met, it’s possible to create a system that allows for switching between manual and automatic control.

Self-regulating valves should fall under the responsibility of the instrumentation department. Even if it’s possible to switch to manual operation, will the process operators be willing to do so in order to ensure production? Or when selecting a self-regulating valve, it is possible to request one equipped with a handwheel, so that it can be adjusted manually in emergency situations

Adjustable valve with a handwheel, allowing for manual adjustment on-site in emergency situations.

Adjustable valves with handwheels are used only when the valve malfunctions and cannot adjust automatically; otherwise, they are not necessary.

I don’t understand why it can’t be used However, when operating it in situ, the movement should not be too excessive; that is, make small adjustments frequently (because when the valve is in good condition, it’s not possible to open it to 50% of its capacity all at once, as this is harmful to the valve). 1. Aren’t most control valves equipped with handwheels? It can definitely be used ； 2. If there is no handwheel, it can also be added ； 3. It will operate as long as the instrument air supply is cut off ； I’ve seen similar situations in factories

If it wasn’t available originally, it’s rather difficult to install a manual mechanism; one would need to find a manufacturer who can provide design drawings so that the mechanism can be manufactured

OP. Your idea is a bit too bold; it would be best if you found the manufacturer directly for repairs, or you can also ask me to buy one for you