Dalian Ligong Safety Equipment Co.,Ltd
(1) The working medium in the pressure vessel or the pipe is sticky or easy to crystallize and polymerization, and it is easy to place the relief valve disc and the base of the safe to stick or plug the safety valve;
(2) The material chemical reaction in the pressure vessel may cause the pressure in the container to rise rapidly and the relief valve can not be opened in time;
(3) The working medium in the pressure vessel or pipe is poisonous gas or expensive gas, and the safety valve may exist where the leakage causes environmental pollution and waste;
(4) The pressure vessel and the pressure pipeline require all discharge or all discharge when the place without hindrance;
(5) Other places that do not apply to the safety valve for bursting films.
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