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Explosion relief valves or crankcase relief valves are non-return flap valves which opens against the spring pressure due to the formation of excess pressure inside the crankcase. An important design characteristics of an explosion relief valve of a diesel engine is its ability to close quickly in order to prevent inrush of air. When the pressure reaches in the region of about maximum upto 0.2bars, these valves must open and let the crankcase gases to get relieved into the engine room atmosphere. At the same time as soon as this release is carried out, the spring should close this relief valve onto the seat. In case of crankcase explosion, viz. the primary explosion and secondary explosion, if the primary pressure wave created is not allowed to relieve, it will damage the crankcase and the personnel. This primary explosion leads to the secondary explosion which takes place due to ingress of fresh air into the crankcase from the atmosphere. If the ingress of air in the crankcase is prevented after the primary explosion in such condition a major secondary explosion can be avoided. Hence in order to relieve the excess pressure generated into the crankcase and to prevent the ingress of fresh air into the crankcase to avoid secondary explosion, the crankcase relief doors are made up of non-return type.

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