Sec. 14-9.11. Muffler on safety valve or safety relief valve

Latest version.

(a) If a muffler is used on a safety valve or safety relief valve it shall have sufficient outlet area to prevent back pressure from interfering with the proper operation and discharge capacity of the valve. The muffler plates or other devices shall be so constructed as to avoid any possibility of restriction of the steam passages due to deposit.
(b) Mufflers shall not be used on high-temperature water boiler safety relief valves.
(c) When a safety valve or safety relief valve is exposed to outdoor elements which may affect operation of the valve, it is permissible to shield the valve with a satisfactory cover. The shield or cover shall be properly vented and arranged to permit servicing and normal operation of the valve.

                    
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