美国阿姆斯壮外导式减压阀
GP-2000 系列先导薄膜式蒸汽减压阀

GP-2000 Externally Piloted Pressure-Reducing Valves

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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 C_v, the GP-2000 is reliable and accurate (+/-1% of pressure set point from 5% to * 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).

GP-2000 Externally Piloted Reducing Valve - Troubleshooting

When Downstream Pressure Continually Rises

Test main valve and pilot:

• Isolate valve

   

• Back adjusting bolt off

   

• Remove tubing from pilot and main valve

   

• Turn steam on

   

• If steam leaks at top port, the pilot may be dirty
  • Replace pilot capsule K-2110
• If steam leaks at middle port, the main valve may be dirty
  • Lap main valve and seat

          过去，先导式减压阀在其主阀操作部主要是使用活塞，但随着时代的要求，蒸汽系统的质量不断提高，也要求减压阀具有更高的控制性能。GP-2000蒸汽减压阀在其主阀操作部取代活塞，使用膜片，先导薄膜式提高Cv值，对一次侧压力变化和二次负荷的变动也具有更高的控制性能。

产自特点
zui大减压比高这20: 1 ， 过去的两段减压现在用一段即可实现。
由于膜片大，又采用外部检测构造，可以控制稳定的二次侧压力。
由于Cv值大，流量及控制能力的飞跃提高， 比通常的公称通径小
1~2个号码的产品也可使用。
由于阀门为单球形，其密封性提高，渗漏量极少。
可管理0.02MPa以下的低压。