How to choose a pneumatic actuator
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As the title says! Could that expert give some advice? ! ! ! ! ! ! ! ! ! ! ! !
In general, factors such as operating conditions – including working pressure, fluid medium, maximum pressure difference, maximum and minimum flow rates, among other process parameters – control type, and valve structure need to be taken into consideration.......
What’s mentioned upstairs is already quite comprehensive; the adjustable value is calculated by the manufacturer. I’ll add one more thing: the ambient temperature
There are many types of actuators, and it’s not clear what type should be used. For example, there are those that rotate, those that lift and lower, those that use pneumatic power, and those that use electric power. When choosing an actuator, it depends on whether your valve requires corresponding power. If it involves design work, check the relevant valve design documents of the company. For on-site modifications, it is best to refer to valves of the same type or turn to valve manufacturers, who can supply appropriate actuators based on your requirements. (It should be a free design) :)
As a further addition, for those involved in interlocking and entering the SIS system, pneumatic diaphragm type is generally preferred； When selecting a cylinder, it is preferred to use one-cylinder models with spring return; otherwise, two-cylinder models require an air reservoir as well.
Why is a gas storage tank needed for a two-cylinder system? Could you please explain?
Agree with what was said on floor 5. The choice mainly depends on your operating conditions and safety requirements, but generally, design institutes provide various parameters, while valve manufacturers offer options for selecting models
It is sufficient to understand the mode of operation, operating pressure and pressure difference, as well as the requirements for safe positioning. In addition to operating pressure and pressure difference, valve torque also needs to be considered after the valve is manufactured. For example, when working on site and coming across floating ball valves weighing 50 kilograms, it is necessary to be aware of the issue of increased torque on the floating ball during use; it may function normally without any load, but under operational load the torque on the floating ball can increase several times over in an instant.