valve sticking

Well i only have 4 valves, so just up and down. and everytime i hit the front down it sticks open. i changed the valve and the switch and it still does it... does anyone know why
 

take em apart and clean and oil em...drain the water from your system too if you havent...

Edited: 3/8/2010 3:21:22 PM by Layumon22s

Where are you? Mine will do this when it's super cold outside, like single digits. If it's dark and cold out the valve is probably just icing up a little from unpreventable moisture that will sneak through even with the best water trap. Like already said, clean valves, drain your tanks...  when you say replaced the switch? are you talking about the switch box? if not, could be a switch going out in your box

I had 1/2" SMC dump valves on the front of my dually. I took them apart numerous times and cleaned them, but never could get them to quit sticking. Tried switching the switch too, eventually I got a pair of older style 3/8 SMC and have had zero problems since. Hopefully you can clean yours and solve your problem.

could it be a ground problem that would be doing this?