系列規格
| Pressure class / nominal rating designation | PN16 to PN100, Class 150 to Class 600 |
|---|---|
| Nominal valve connection size | 1/2 x 1/2 inch to 12 x 14 inches, depending on model |
| End connection types | Threaded NPT, Flanged RF or RTJ facing |
| Design standards | API 520, API 521, API 526 |
| Inspection and pressure-test standards | API 527, ASME PTC 25.3, API 598, DIN 3230 |
| Blowdown Range | Blowdown typically varies from roughly 2-20%; some valves offer adjustable blowdown |
| Materials (component scope as published) | Cast iron, Ductile iron, WCB, SS304, SS316 |
| nozzle and disc materials | SS304, SS316, 2Cr13 |
| service media | Steam, Gas, Vapour, Water, Compatible liquids |
| working principle | Opens automatically at a predetermined set pressure to protect pressure vessels and other equipment from pressures exceeding their design limits |
| reseat blowdown | Blowdown is stated as a percentage of set pressure - how much the pressure must drop before the valve reseats |
| loading options | Spring-operated as standard; diaphragms at lower pressures; oldest designs used a weight |
| relief valve liquid duty | Relief valve (liquid service) opens proportionally as rising pressure overcomes the spring |
| safety valve gas duty | Safety valve (gas service) is full-lift or snap acting - pops completely open |
| pop action speed | Pop action snaps into full lift in milliseconds; a disc skirt exposes larger area to create more lifting force |
| protection types | Thermal protection uses small-orifice valves for liquid thermal expansion; flow protection uses considerably larger valves sized for rapid discharge of gas or high liquid volumes |
| thermal relief rationale | Small thermal-relief valves suffice because liquids are nearly incompressible - a small discharge produces a substantial pressure reduction |
| manual lever note | Pressure safety valves carry a manual lever for emergency actuation |
| compressible fluid scope | Compressible-fluid safety valve usually opens completely, accompanied by a popping sound |
| api526 standardization | API 526 executions use standardized capacities, installation dimensions and materials, with design and selection standardized per API 520 |
| set pressure envelope ref | Industrial reference envelope: set pressure 0.2-400 barg (2-5,802 psig) |
| temperature envelope ref | Industrial reference temperature envelope: -273 to 550 °C (-450 to 1,000 °F) |
| orifice letters ref | Industrial reference orifice span: API 526 letters D through T |
| connection envelope ref | Industrial reference connection span: DN 25 to DN 200 / NPS 1 to NPS 8 |
| trim robustness | Service life extended by hardened discs, stellited seats and shielded bellows |
範圍與來源備註
| set pressure envelope | Set-pressure envelope: the referenced industrial executions span up to 400 barg (5,802 psig), far above the tenant PN16-PN40 / Class 150-300 band - the tenant range covers only the low-pressure segment of the referenced envelope. |
|---|---|
| temperature envelope | Temperature envelope: the referenced -273 to 550 °C execution span has no tenant counterpart - the tenant page states no temperature limits for its materials. |
| duty type split | Duty-type split: proportional opening is specific to liquid relief valves while full-lift pop action belongs to compressible-fluid safety valves - the tenant family mixes full lift, low lift and steam lines without mapping each to its opening behavior. |
| testing emphasis | Testing emphasis: the tenant testing standards cover seat tightness (API 527) and performance (ASME PTC 25.3), while the referenced OEM line also cites exceeding API 527 tightness requirements through seat finishing - tenant tightness margin is not quantified. |
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
供應條件、訂購數量與交期按訂單議定——請在詢問時說明目的地國家與所需時程。
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。
常見問題
安全閥的報價詢問應包含哪些內容？
執行標準與壓力等級、公稱口徑、閥體與閥座材質、介質及溫度、目的地——缺失的資訊會在報價過程中確認。
安全閥提供哪些口徑與壓力等級？
本頁面尚未公布該閥門經驗證的口徑與壓力等級範圍——適用於您工況的口徑與壓力等級會在報價過程中提出並確認。請在詢問時附上工況條件，選型結果會在報價中說明。
安全閥提供哪些閥體材質？
本頁面尚未公布該閥門經驗證的閥體材質範圍——適用於您工況的閥體材質會在報價過程中提出並確認。請在詢問時附上工況條件，選型結果會在報價中說明。
本系列的類型
類型
全啟式安全閥
全啟式安全閥在達到整定壓力時瞬間全開，釋放全部喉部面積，使鍋爐、儲氣罐與容器周圍可壓縮或兩相服務的積壓迅速下降。產品範圍涵蓋彈簧加載結構，閥體為鑄鐵、WCB、SS304 或 SS316，內件組——噴嘴、調節環、閥盤、導向套與閥桿——為 2Cr13、SS304 或 SS316，碳鋼閥蓋與罩帽、鋼彈簧與 2Cr13 調整螺
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微啟式安全閥
微啟式安全閥僅開啟閥座直徑的一小部分，沿閥座面釋放經計量的少量流體——這種比例式行為適合液體系統以及全開排放會過度擾動的任務。產品範圍涵蓋彈簧加載結構，閥體為鑄鐵、WCB、SS304 或 SS316，噴嘴、調節環、閥盤、導向套與閥桿組為 2Cr13、SS304 或 SS316，碳鋼閥蓋與罩帽、鋼彈簧與 2Cr13 調整
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類型
蒸汽安全閥
蒸汽安全閥守護鍋爐與蒸汽集箱，在超壓閃發抬高容器額定之前排放——按入口-出口成對法蘭定尺寸，使小入口服務大排放。產品範圍涵蓋彈簧加載結構，閥體為鑄鐵、WCB、SS304、SS316 或球墨鑄鐵，噴嘴、調節環、閥盤、導向套與閥桿組為 SS304 或 SS316，碳鋼閥蓋與罩帽、鋼彈簧與不鏽鋼調整螺栓。工作壓力涵蓋 PN1
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平衡波紋管安全閥
平衡波紋管安全閥在背壓會使傳統彈簧式洩壓閥降額的場合保持整定壓力穩定：波紋管將彈簧與閥盤導向件與排放側隔離，抵消隨時間變化的疊加背壓。口徑、等級、整定壓力窗口、閥體與波紋管材料在報價時依所需排量與背壓任務確認。背壓下排量仍會降額：API 520 的 Kb 因數自約 30-40% 背壓開始衰減，其曲線圖將選型上限設在 5
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先導式安全閥
先導式安全閥將主閥與外部先導閥配對：先導閥感測管線壓力並控制主閥，在整定壓力下全開、啟閉壓差短，且在整定壓力以下保持動態密封——因此操作壓力可以貼近整定壓力運行而不產生前洩或介質損失。典型壓力覆蓋為 DN25-DN200（1" x 2" 至 8" x 10" 入口 x 出口），ANSI Class 150-600 /
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