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Causes and analysis of valve leakage
2015-01-03 by bridge
Valve leak is divided into two, namely leakage and internal leakage. Endoleak refers to the sealing surface of the Gas Burner Safety Valve seat and valve between the closed lax, allowing fluid to flow through the valve can not be completely cut off and produce internal leakage phenomenon. Leakage of the valve means through the packing medium inside the pipe from the inside outward leakage phenomenon. Under normal circumstances, the drain valve leakage within the valve will be more serious leakage of the valve will have a great raw materials and waste products, but also seriously affect the environment, or even cause an explosion, fire, poisoning and other hazards of life of a major accident.
Valve leakage phenomenon often appear in the body, stem, stuffing and joints of the body. External body leaked from manufacture to produce the form of the body. Most of the Water Heater Gas Valve are cast, so prone to trachoma is inevitable. However, the valve flow outwardly through trachoma leak is relatively small, thus the impact is relatively small, and this can be detected by trachoma hydrostatic test. Stem external leak from the valve stem to produce the design and material selection. Vertical movement of the valve stem will turn on and off, so if there are problems in the design and selection of the stem, then there may be stuck and thus can not completely shut down the stem gas cooker safety valve during use and cause leakage phenomenon . This has led to the leakage amount generally will be relatively large. So the impact on the surrounding environment and the apparatus is relatively large. Stuffing external leakage generated from: (1) loose packing gland; (2) packing is not tight; (3) the inappropriate choice of filler material or have quality problems; (4) packing aging or worn these four aspects . Produced outside the body junction leakage from: (1) the type of gasket, material or size of improper selection; (2) the flange sealing surface quality problems; (3) bolts loose joints; (4) due to pipeline size Select unreasonable resulted in excessive body connection load these four aspects.
Valve leakage phenomenon often appear in the body, stem, stuffing and joints of the body. External body leaked from manufacture to produce the form of the body. Most of the Water Heater Gas Valve are cast, so prone to trachoma is inevitable. However, the valve flow outwardly through trachoma leak is relatively small, thus the impact is relatively small, and this can be detected by trachoma hydrostatic test. Stem external leak from the valve stem to produce the design and material selection. Vertical movement of the valve stem will turn on and off, so if there are problems in the design and selection of the stem, then there may be stuck and thus can not completely shut down the stem gas cooker safety valve during use and cause leakage phenomenon . This has led to the leakage amount generally will be relatively large. So the impact on the surrounding environment and the apparatus is relatively large. Stuffing external leakage generated from: (1) loose packing gland; (2) packing is not tight; (3) the inappropriate choice of filler material or have quality problems; (4) packing aging or worn these four aspects . Produced outside the body junction leakage from: (1) the type of gasket, material or size of improper selection; (2) the flange sealing surface quality problems; (3) bolts loose joints; (4) due to pipeline size Select unreasonable resulted in excessive body connection load these four aspects.
keywords: Propane Control Valve