I have this safety valve installed on cold water inlet of my boiler/water heater. When I turn on hot water tap but keep it around 30%-50% open this valve produces really loud noise, which travels through the pipes and is really annoying. The noise goes away when you fully open the warm water tap.
Given how the valve looks on the inside:
I think the problem is, the spring is faulty, and is vibrating in the low pressure.
Is this a common thing or should I replace the safety valve? I'm afraid replacing it won't solve the problem.