美國阿姆斯壯外導(dǎo)式減壓閥
GP-2000 系列先導(dǎo)薄膜式蒸汽減壓閥

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 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).

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

          過去，先導(dǎo)式減壓閥在其主閥操作部主要是使用活塞，但隨著時代的要求，蒸汽系統(tǒng)的質(zhì)量不斷提高，也要求減壓閥具有更高的控制性能。GP-2000蒸汽減壓閥在其主閥操作部取代活塞，使用膜片，先導(dǎo)薄膜式提高Cv值，對一次側(cè)壓力變化和二次負(fù)荷的變動也具有更高的控制性能。

產(chǎn)自特點
zui大減壓比高這20: 1 ， 過去的兩段減壓現(xiàn)在用一段即可實現(xiàn)。
由于膜片大，又采用外部檢測構(gòu)造，可以控制穩(wěn)定的二次側(cè)壓力。
由于Cv值大，流量及控制能力的飛躍提高， 比通常的公稱通徑小
1~2個號碼的產(chǎn)品也可使用。
由于閥門為單球形，其密封性提高，滲漏量極少。
可管理0.02MPa以下的低壓。