外导式膜片作用减压阀
适用于蒸汽系统
这种减压阀类似于内导式活塞式减压阀（内部采用了一个导阀和一个主阀）。但是双膜片代替了活塞阀。增大的膜片面积能够打开更大的主阀，与内导式活塞减压阀相比，在相同的管道尺寸下容量更大。另外，膜片对压力变化更为敏感，精确度可达+/-1%。精确性更高是由于下游传感线的定位，其所在位置气体或液体动荡更少。该减压阀非常灵活，可以采用不同类型的导阀（例如压力阀、温度阀、空气装载阀、电磁阀或几种阀同时配套使用）。
GP-2000 Externally Piloted Pressure-Reducing Valves
For steam service
The GP-2000 is a high-performance, externally piloted reducing valve for large-capacity requirements. Typical use is on intermittent service, including applications such as heat exchangers, steam coils, rotating dryers, process equipment and heating systems. With a 20:1 rangeability and high Cv, the GP-2000 is reliable and accurate (+/-1% of pressure set point from 5% to 100% of flow) over a long, trouble-free service life. Hardened stainless steel working parts are renewable in-line. The GP-2000 is single-seated for dead-end service, and it is available with both NPT (1/2"–2") (15–50 mm) and flanged connections in 2"–6" sizes (50–150 mm).
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