Issues related to self-regulating valves

It seems you’re not in the instrumentation field but rather in process engineering. 1. During procurement, it’s the instrumentation team that is responsible for selecting the instruments; as for operation later on, it depends on how the company organizes its tasks – both instrumentation and process engineering aspects are involved； 2. Whether a self-regulating valve has strong pressure-stabilizing capabilities depends on your control requirements; generally, it is capable of fulfilling such tasks. The purpose of a self-regulating valve is to stabilize pressure or temperature ； 3. I’m not quite sure how this piston actuator works. The component in a self-regulating valve is called a diaphragm; leakage may occur, but as long as the right model is chosen and the quality of the valve is good, there’s no need to worry. The pistons are available in EPDM ethylene propylene diene monomer rubber, NBR nitrile rubber, 302 stainless steel, and some other materials whose names I can’t recall; the final choice depends on the requirements of your manufacturing process.

It depends on the division of responsibilities among various units as to which department is in charge; it can be under the responsibility of anyone. There are self-acting control valves with relatively good adaptability, but their control accuracy is still somewhat lower than that of PID control systems.

Fisher has the largest variety of self-acting types: 627, 1098, ACE95, MR95, T205, and so on. There is surely one among them that will meet your requirements

1. Determining which department is in charge depends on whether there are any fixed regulations regarding the internal structure of the company； 2. The strength of stability is determined by your operating conditions; strong and weak are relative terms, and the relevant operating conditions need to be specified ；

What is the pressure tolerance of the piston actuator? This question. . . . . It’s hard to answer. As for the leakage rate, it depends on whether you require level IV or level V performance; generally, both can be achieved. The packing materials include PTFE, graphite, and metals – it depends on your operating conditions

It is understood that the pressure resistance of the film is 4 kilograms; in the field of control valves, pistons generally have a pressure resistance of 7 kilograms, while in the case of self-acting valves, a pressure resistance of 40 kilograms is also no problem. By leakage, I mean the amount of leakage from the piston actuator; after all, there is a piston there

The two models 627 and MR95 by Fisher that I mentioned earlier can reach an inlet pressure of up to 6.89 MPa, which is much higher than 4 kilograms; for more specific details, you can consult the respective manufacturers

The effective area of the diaphragm is the area that exerts a force when subjected to pressure; the larger this effective area, the greater the output force will be, given a constant overpressure or lower limit of the spring range. This force is separate from the medium present in the process pipeline. What exactly does the original poster want to know?

What I’m concerned about: 1. The actuator of the self-acting valve: What is the pressure rating of the diaphragm type? Piston leakage situation? 2. Are all the valve body parts of the quick-open type? What is the adjustment ability? Such as the adjustment ratio, and so on.