Newell Gurus

I currently have a leak from my (HCV) valve. I’m assuming this is not normal. What would be the best resolution to fix this?

My 1987 took the Delco valves. 
Drivers side and front use same part number, 22062525.
The 22069147 passenger rear
[attachment=11914][attachment=11915][attachment=11916]

Some air escaping from the exhaust port is normal as the hcv attempts to keep the coach level during varying loads. I would advise spraying the whole valve with soapy water to check the seals and fittings.