| 摘要 |
A two-stage hydraulic pressure fire protection sprinkler piping system includes a metal pipe section and a plastic pipe section. The metal pipe section may be connected to a high pressure water supply source while the plastic pipe section delivers water o f a predetermined pressure level to spray sprinkler heads to provide a selected fire extinguis h water spray pattern in a floor area of a multi-storey building. The high pressure in the metal pipe section is reduced to the predetermined level by a pressure reducing valve connected between the metal pipe section and the plastic pipe section to prevent occurrence of distorted water sprayi ng pattern and pre- matured strain aging of the plastic material of the plastic pipe section.</S DOAB>
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