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Varivalve Quick Vents & Hissing
Just replaced the vents on all of my steam radiators with varivalve quick vents. Overall, the system is working well and all radiators are heating up evenly. However, I've noticed a few times per day one of the valves releases a very loud hiss for 2 seconds and then stops (can hear it from another room). Seems like the pressure has built up and the first valve the cool off makes the sound. Is this normal?