Pressure relief valve

The pressure relief valve is an important safety device primarily used to protect ash silo systems from excessive positive or negative pressure, ensuring the safe operation of the silos. This valve typically consists of components such as a retaining ring spring, valve cover, and valve seat, with the design aimed at preventing the silo from experiencing excessive pressure, thereby avoiding safety risks due to high pressure. The characteristics of the top explosion-proof valve include reliable operation, tight spring sealing, and a long service life, making it an indispensable safety device for ash silo systems.

Darko can provide customized direct pressure relief valves for ash silo tops. The models and specifications of the vacuum pressure relief valves include the 273 pressure relief valve, 308  relief valve, 408 pressure vacuum relief valve, 508 vacuum pressure relief valve, and 610 pressure vacuum relief valve. The pressure vacuum values for different specifications can be determined based on user operating conditions.

Main Features

The design of the vacuum pressure relief valve includes components such as the valve seat, retaining ring spring, retaining ring, valve cover, vacuum ring, diaphragm, and pin. These parts work together to ensure the safe and stable operation of the silo.

1. The device features a large-diameter exhaust port (mm), with the exhaust port cover made of aluminum alloy, which is lightweight and responsive to pressure changes. The weight of the valve cover sets the opening pressure, ensuring reliable and correct opening pressure even after long-term operation.

2. It uses aluminum alloy and cast iron structures, making it resistant to corrosion and aging.

3. The design is simple, with no maintenance required during normal operation.

4. The vacuum relief valve operates flexibly and reliably.

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Working Principle

The working principle of the pressure relief valve is based on its structural characteristics. When the pressure inside the silo exceeds the set value, the valve body automatically opens to release pressure. This prevents damage to the silo from excessive positive pressure. Conversely, when a vacuum occurs inside the silo (i.e., internal pressure is lower than external atmospheric pressure), the device also functions by allowing external air to enter. This prevents damage from excessive negative pressure. This design ensures that the silo operates within normal pressure ranges, protecting both equipment and materials.

Static Position (Sealed):

When the pressure inside the silo (or ash silo) is maintained within the selected pressure value of the valve, the valve cover remains in a static position. The pressure inside the silo generates a force on the top surface of the flexible diaphragm. This force causes the diaphragm to tightly contact the valve seat, achieving a seal.

Pressure Release:

When the pressure inside the silo increases to the selected pressure value, the internal pressure overcomes the weight of the valve cover. This lifts the cover off the valve seat while releasing pressure. The valve cover then returns to its normal position once the internal pressure drops to the selected value.

Vacuum Release:

When the pressure inside the silo is lower than atmospheric pressure, a vacuum is created. When it reaches the selected vacuum value, atmospheric pressure acts on the diaphragm. This lifts the vacuum ring to a floating position, allowing air to enter the silo. The vacuum ring returns to its normal position against the diaphragm once the vacuum inside the silo is less than the selected value.