泄壓持壓閥一般分為隔膜閥和活塞閥兩大類，本公司生產(chǎn)的泄壓持壓閥口徑在DN400mm以下者采用隔

膜型，口徑在DN450mm以上者采用活塞型，兩者之動作原理類似。泄壓持壓閥在給水管線上能有效地將

超過導(dǎo)閥安全設(shè)定值的壓力泄壓釋放，防止對管線與設(shè)備因超壓而損壞。該閥主要用于高層大樓消防測試

Decompression or sustaining valves are usually divided into diaphragm valves and piston valves two categories, the caliber of the  company’s production bellows DN500 using diaphragm type, and DN600 more in the use of piston type, whichever is the principle of similar moves. In the water supply pipeline, decompression and sustaining valves can release the pressure effectively which over the safety valve settings, prevent the pipeline and equipments are damaged by the excess pressure. The valves are mainly used in the decompression of the fire protection test circle system; prevent the system failure because of the excess pressure.