Solenoid Valve FAQ

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Q:
I have been told that 2-way valves only allow fluid flow in one direction. Is this correct?
A:
You should NOT assume that a 2-way valve would be automatically bi-directional for most them only allow flow in one direction. The manufacturer of the valve manufacturer will be able to tell if the particular valve is bi-directional.
Q:
Why are so many general purpose valves limited to temperatures above 32 degrees Fehrenheit?
A:

 

Any moisture in the valve could freeze at temperatures below freezong, causing the valve to stick. Also, the seal material may harden at below freezing temperatures and the valve may leak.
Q:
My diaphragm type valve does not work in my gravity feed application with water. Any idea why I'm having a problem since it seems to work fine with compressed air?
A:
Diaphragm type valves require a minimum pressure to operate (usually 3 to 5 psi). A water tank which is 24" high only creates a pressure of less than 1 psi. You will need to find a direct acting valve for your application. Direct acting valves do not have a minimum pressure requirement.
Q:
I purchased a used 12-Volt solenoid valve on eBay and it did not come with instructions. Both of the leadwires are black in color. How do I know which is one is positive?
A:
Two wire solenoid valve coils do not have any polarity requirement (i.e. you don't have to worry about mixing the positive and negative wires).

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