Safety Valve Discharge Noise Control & Silencer Selection
Safety valve discharge can produce noise levels up to 130dB(A) – well above the 85dB(A) occupational limit. A silencer (muffler) is effective, but the wrong type increases backpressure and affects valve performance.The main safety valve product names of China Safety Valve Network include:JIS Safety Valve,Main Safety Valve,Overflow ValveOil Refining Specific Safety Valve,Pulse Safety Valve,Pilot Safety Valve,Pressure Safety Valve,Quick Switching Safety Valve,Spring Low Lift Safety Valve,Spring Low Lift High Pressure Safety Valve,Spring Low Lift Closed High Pressure Safety Valve
Noise sources
Jet noise (high‑speed gas mixing with air), turbulent noise, and mechanical vibration. Jet noise dominates.
Silencer types
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Perforated plate – Multi‑stage pressure reduction, 15–25dB(A) attenuation. Suitable for clean steam/air; low backpressure.
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Multi‑hole jet – Splits large orifice into many small holes, shifting frequency above hearing range. 20–30dB(A). Ideal for high‑pressure gas (>2MPa).
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Combined type – Perforated plates + jet holes, 30–40dB(A). For strict noise limits.
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Absorptive – Uses acoustic material (rock wool). 25–35dB(A) but prone to clogging; not for wet steam or particulates.
Selection tips
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Silencer backpressure must stay within valve’s allowable limit (≤10% of set pressure for conventional spring valves).
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Body material compatible with discharge medium – use SS304/316 for steam.
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Install a drain at the bottom to prevent condensate accumulation.
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Regularly inspect for clogging or deformed plates.
Simple field measures
If no silencer, wrap discharge pipe with lagging, add a shield, and enforce ear protection.
Bottom line: Select silencer by medium, backpressure, and required attenuation. Correct type plus routine maintenance keeps noise down without compromising safety.
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