Friday, April 24, 2020

Relief valve blow down ring

The difference between the set pressure at which relief valve starts lifting and at the pressure it reseats is known as blown down of relief valve . Suppose relief valve set pressure is 30 bar
At 30 bar it starts opening as pressure increases valve opening increases . When it drops to 28 bar valve reseats so blowdown is 2 bar.
The blowdown ring on a relief valve is adjusted to set te reseat pressure of the valve
The spring pressure determines the pressure at which valve coil lift , where as blowdown ring determines when it will reseats.

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