3.Sigma Valve:The sigma valve basic function is to bleed off instrument gas or block it depending on the prevailing circumstance or situation.The signal is tranduced by the sensor (p-pilot),which has a supply inlet and two way outlet to the sigma valve and the u-valve which consist of gasket,plunger,and spring.
4.Fusing Plug:The fusing plug is a mechanical elbow filled with lead and acts as fire safety device because the melting point of lead is less than the ignition temperature of oil/gas.
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