安全閥 · 先導式安全閥
高效先導式安全閥
高效先導式安全閥（POSV）以主閥與感測管線壓力的先導閥取代傳統洩壓閥的加載彈簧：開啟與關閉由先導控制，主閥以短啟閉壓差達到全開，並可在操作壓力的 97% 處保持整定壓力——比彈簧閥所能允許的餘量緊得多。基準結構涵蓋 DN 25 至 DN 200（NPS 1 至 8），整定壓力 1.0 至 650.0 barg（15.0 至 9427.0 psig），溫度 -162 至 320°C（-260 至 608°F），孔口 D 至 T+，背壓可容忍至整定壓力的 95%。
屬於 先導式安全閥 系列
最後更新： 2026-11
規格
| design | Pilot-operated safety valve (POSV) |
|---|---|
| Set pressure | 1.0–650.0 barg (15.0–9427.0 psig) |
| Service temperature range | -162 to 320 °C (-260 to 608 °F) |
| Capacity Orifice | D to T+ |
| Nominal valve connection size | DN 25 to DN 200, NPS 1 to NPS 8 |
| Valve body material | Carbon steel, Stainless steel |
| operating pressure ratio | Up to 97% of set pressure |
| back pressure ratio | Up to 95% of set pressure |
| End connection types | Flange acc. to DIN EN 1092 or acc. to ASME B 16.5 or acc. to JIS 2220 |
| Pressure class / nominal rating designation | PN 10 - PN 400 | CL150 - CL2500 |
| Design standards | API 526 |
| pilot action modes | Pop Action, Modulate Action |
應用與選型指引
Size the orifice (D to T+) for required capacity, then select the body — carbon steel or stainless steel — against the process fluid and temperature. The 97% operating-to-set-pressure ratio suits systems running close to their relief set point, and the 95% back-pressure tolerance allows a common discharge header where spring-loaded valves would need individually sized tails.
常見問題
How does a pilot operated safety valve differ from a spring-loaded safety valve?
A pilot senses system pressure and controls the main valve instead of a large mechanical spring. The result is full-lift opening with a short blowdown, and set behaviour that stays accurate at operating pressures up to 97% of set pressure, where a spring valve would already be weeping.
What set-pressure range and back-pressure can the high-efficiency POSV handle?
Set pressures from 1.0 to 650.0 barg (15.0 to 9427.0 psig) over -162 to 320°C (-260 to 608°F), with back-pressure tolerated up to 95% of set pressure — enough to share a common discharge header in most installations.
What sizes and materials are available?
Inlet sizes DN 25 to DN 200 (NPS 1 to 8) with orifices D to T+, in carbon steel or stainless steel bodies selected against the process fluid and temperature within the -162 to 320°C window.
訂購與文件
文件
請在詢問時一併說明您需要的文件組合——此結構的常見項目（材質證明、按所列檢驗標準的測試報告、尺寸圖）將於報價時確認並隨附供應。
報價
可直接報價的詢問應說明：公稱口徑與壓力額定、閥體與閥座材質偏好、端部連接、操作方式，以及含溫度的使用介質。本頁的典型值為基準參考範圍；具有約束力的數值於報價時確認。
樣品與供應
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儲存與運輸
閥門儲存時應保護閥座與密封件免受紫外線、臭氧與變形影響，安裝前保留端面保護蓋；彈性體或 PTFE 閥座結構應避免長期戶外存放——閥座材料在陽光直射與冰凍條件下老化最快。