1.liquid-pressure style safety valve is a assistant equipment of the breathing valve(moving disc style)the active pressure of aspera-tion and expiration is higher than breathing valve(moving disc style )asupon once the breathing valve does not work in winter the moving disc will de frozenthe liquid seal of the liquid –pressure style safety valve can be broken for protecting the oil tank.
2.liquid-pressure safety valve will beinstalled in top of oil tank and assorted used with breathing valve.
3.the control pressure:+56mm water columm to -50mm water columm.