The importance of proper installation of Needle Valves...
All well designed needle valves include an arrow shape, either machined, or cast into the main body
of the needle valve. It is common to see needle valves, with the same or different threads on both the inlet
and the outlet. So let us examine this arrow and it's importance. As with any pressurized gas or liquid,
safety is paramount. Therefore we have discovered the reason for the arrow. As you can see in the illustration
above, even though a needle valve may look similar from either end, the inside is very different.
In the above image, you see that if the gas is entering the valve from the RIGHT, and the valve is shut,
there is no pressure on the seals around the valve stem and knob assembly. On the other hand, if the
inlet was connected in error, with the gas supply coming in from the LEFT, in the illustration, then
with the valve closed, the seals around the valve stem and knob would be under stress... NOT GOOD!!!!
Proper installation of a needle valve will ensure years of safe operation.
NOTICE: By purchasing products from Bigway.com, you represent that you are qualified to install the parts you purchase, or will have a qualified person install them for you, in compliance with any applicable local, state, or federal regulations. Bigway disclaims any and all responsibility for injury, damages, or other consequences caused by the improper installation or use of products purchased from Bigway.com.
