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circuit symbol

Does anyone know what this circuit symbol is? My guess is that it's a surge protector but I'm not sure

Context

enter image description here

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    \$\begingroup\$ It would help to show the context this symbol is in. \$\endgroup\$ – Olin Lathrop Sep 24 '14 at 18:32
  • \$\begingroup\$ Just edited to add context \$\endgroup\$ – SivaDotRender Sep 24 '14 at 18:36
  • \$\begingroup\$ @SivaDotRender The context image is not visible. \$\endgroup\$ – Karlo Mar 2 '17 at 15:42
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According to Edraw: Standard Process Flow Diagram Symbols and Their Usage, it is the symbol for a pump.

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  • \$\begingroup\$ It turns out that the SPKx5 referenced in the image is a gas valve. So either this is the symbol for the valve itself, or some kind of ancillary pump associated with the valve's application. \$\endgroup\$ – Dan Sheppard Sep 24 '14 at 19:18
  • \$\begingroup\$ I did some research and yes you are correct. This is the pump that pumps oil into a piston in order to open the valve. \$\endgroup\$ – SivaDotRender Sep 24 '14 at 20:24
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Looks like a general pump symbol to me.

enter image description here

ref: http://processprinciples.com/2012/07/autocad-pid-pump-symbols/

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