Which is better, an electric valve or a pneumatic valve? ? ? How to choose, which one has a lower cost? ?
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Which is better, an electric valve or a pneumatic valve? ? ? How to choose, which one has a lower cost? ? How to choose between electric valves and pneumatic valves? Is there any requirement that a pneumatic valve must be used?
For explosion-proof applications, it’s advisable to use pneumatic systems wherever possible. Pneumatic solutions are cheaper, but they require instrument air as well as corresponding piping
Electric valves are used in areas where there is no instrument air, while they are rarely used in areas where instrument air is available.
In my opinion, it should be considered from several aspects: 1. Whether it is an environment that requires explosion protection; if so, electric actuators are relatively expensive, while pneumatic ones are cheaper； 2. Is there an available air source (purified air for instruments)? If such an air source is available, pneumatic valves are of course cheaper ； 3. For newly installed systems, if the number of automatic control (shut-off and venting) valves used is small and no UPS protection during power outages is required, then electric actuators are a simpler and more practical choice, as they are also less expensive. If the number of valves is large, then pneumatic actuators are more suitable; otherwise, having an air compressor/adsorption regeneration system just for a few valves is like keeping a cow just to get a glass of milk. .
From a process perspective, pneumatic valves should have a fast operating time; process requirements that demand rapid action warrant the use of pneumatic valves. For applications with explosion-proof requirements, pneumatic valves are more suitable. For applications with three shut-off requirements, pneumatic valves offer greater flexibility in configuration and various options, enabling them to better meet process requirements. Valves are designed to serve the process; given the requirements of that process, the valves must be configured in accordance with those requirements. There is no such thing as a good or bad person; it’s just a matter of who is more suitable. Costs also need to be considered comprehensively in terms of construction costs and operating costs.
They are used more often in pneumatic valves, and their failure rate is low. The valves in some critical locations are designed to be operated by air power; they can be equipped with an air storage tank that allows the valves to be opened and closed once in the event of a gas supply interruption. If there is no air left in the storage tank, an air pump can be used to operate the valves on-site, which is simpler than using electric valves
As mentioned above, the first factor is whether there are any explosion-proof requirements, and the second is the number of valves required. If only a few valves are needed, electric valves may be a simpler option, as there is no need to install a gas supply system. When the quantity is large, the advantages of pneumatic valves become evident. Don’t you think so?
Electric valves are expensive, take up little space, and remain in their faulty state.
It’s usually pneumatic, right? When building such a system, one has to set up a small air compressor station – not just for instrument air, but also because there is a high demand for compressed air itself. Electric valves are indeed expensive, that’s what everyone says.
When instrument air is available, use pneumatic valves decisively.