I'm having problems with my pressure pot, which the retailer said it max 80 PSI and safety valve was set to 60 PSI, the only place it leaks is in the safety valve, I set it to release at 50 and tried with 30 PSI too, the valve opens normally and release pressure when it hit the max PSI I set, but when it closes, it keeps leaking air as showed on the image... this is not how it's supposed to work, right? I'm losing lots of pressure within the hours. Is this a defective valve?