Solenoid valve symbology: detented coil on a two-position single-coil spring-return valve?

[cncsnw]

Why does the valve in the attached picture (Hidraman SWH-G02-B2S-D24-20) appear to show a detent on the 'a' solenoid coil, when the 'b' side is spring return?

I cannot see how that would be useful. Am I misreading the symbols?

If that is supposed to be a spring on the left, rather than a detent, I still do not see how it would make sense.

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https://res.cloudinary.com/engineering-com/image/upload/v1673819894/tips/P1090003_ss6efz.jpg

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Marc Leonard
CNC Services Northwest

http://www.cncsnw.com

 

[srini1785]

Something to do with Manual Override?. Its a 3 position mid position closed valve. Hence the two dents.

Pneumatic valves have them. I'm not sure about hydraulic ones.

 

[73lafuite]

It is quite simply a 4/2 solenoid valve, arrows crossed at rest, parallel arrows energized, with a closed transfer.

 

[cncsnw]

Thanks. I will assume that the zig-zag symbol on the 'a' side is just a typo.

Marc Leonard
CNC Services Northwest LLC

http://www.cncsnw.com