系列規格
| Nominal valve connection size | DN15 to DN1500 |
|---|---|
| Pressure class / nominal rating designation | ANSI Class 125 to Class 2500 (PN10 to PN420) |
| Cracking Pressure | Cracking pressure is the inlet-to-outlet differential required to open the valve. If it exceeds the available differential the valve never fully opens; the internals then rattle and chatter, causing excessive wear and premature failure. |
| End connection types | Flanged, Butt Weld, Wafer, RTJ |
| Operation / closure mode | Self-acting (automatic) |
| Service temperature range | -196°C to 570°C |
| Design standards | API 6D, API 594, ASME B16.34, EN 12334 |
| Inspection and pressure-test standards | API 598, EN 12266-1 |
| Designs | Swing, Dual Plate (wafer), Single Plate, Tilting Disc, Lift, Non-Slam Swing, Pressure Seal Swing, Forged Steel Swing |
| Materials (component scope as published) | WCB (ASTM A216), CF8, CF8M (ASTM A351), F316, F316L (ASTM A182), F51/2205 duplex (ASTM A182), F53, F55/2507 super duplex (ASTM A182), F11, F22 alloy (ASTM A182), GG25 cast iron (EN 1561), GGG40, GGG50 ductile iron (EN 1563), C95400, C95800 aluminium bronze (ASTM B148) |
| slam mechanism | Slam is the water hammer caused by the sudden stopping of reverse flow through the check valve as it closes; the accompanying noise is pipe stretching under the surge, not disc impact on the seat. |
| slam prediction rule | Approximately 100 ft of water hammer per 1 ft/sec of reverse velocity at closure. Field experience: 50-100 ft surge (0.5-1.0 ft/sec reverse velocity) is a mild slam that can be tolerated; above 100 ft (over 1.0 ft/sec) the slam is extremely loud and should be avoided with a faster-closing valve or dashpot. |
| non slam closure principles | Close rapidly before appreciable reverse flow develops: low disc inertia and friction, short disc travel, or spring-assisted motion, Close very slowly after reverse flow develops: external oil dashpot control |
| slam potential by design | Best non-slam: nozzle check, dual disc, silent check — all spring-assisted. Middle: swing-flex and tilted disc (angled seat, short stroke). Greatest slam potential: ball check and swing check (long stroke, no spring assist). |
| orientation effect on closure | Published test data assumes horizontal installation. Gravity-reliant designs (swing, tilting disc, swing-flex) may slam more when installed in vertical pipe; spring-closure designs (dual disc, silent) close faster in vertical lines due to gravity acting on the disc. |
| cracking pressure spring range | Spring cracking pressures are available from roughly 1/8 PSI to upwards of 85 PSI depending on spring selection (single-manufacturer offered range; typical swing valves crack below 1 psi from disc weight). |
| cracking pressure vertical effect | Vertical down-flow: gravity pulls the trim weight against the spring, reducing net cracking pressure (may open or fail to reseat). Vertical up-flow: trim weight adds to the opening force required. |
| installation orientation | Swing check valves are most common horizontally with hinge/cover orientation critical to closure; vertical down-flow is design-sensitive and requires confirmation. Spring-loaded designs are more orientation-flexible, but spring-loaded does not automatically mean suitable for all positions. |
| turbulence chatter wear | Pump-discharge or elbow turbulence creates an asymmetric velocity profile; the closure element receives uneven opening force and may flutter or partially open, accelerating wear on the seat, hinge pin, spring and guides. |
| axial silent design | Axial-flow silent checks hold the disc on a spring for ultra-fast closure without backflow or pressure surge; a venturi-shaped full-port body with high pressure recovery keeps loss low. |
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
逆止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。
逆止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。
逆止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
旋啟式逆止閥
旋啟式逆止閥以鉸接閥盤阻止倒流：正向流動時閥盤旋開，流速減慢或倒流時落回閥座。產品範圍涵蓋法蘭與對焊系列 DN50 至 DN600，Class 150 至 Class 300（相當於 PN16 至 PN100），閥體、閥蓋與閥盤提供鑄鐵、碳鋼與奧氏體不鏽鋼結構直至 CF3M。設計依 BS1868、API 6D 與 DI
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類型
雙瓣逆止閥（dual plate）
雙瓣逆止閥在中心鉸軸上搭載兩片彈簧加載的半圓閥瓣，流速仍在減速時閥瓣即以短行程關閉——這是在緊湊對夾閥體中保持低關閉撞擊與水錘的常規答案。產品範圍涵蓋對夾系列 DN50 至 DN900，Class 150 至 Class 2500，閥瓣為球墨鑄鐵、不鏽鋼與鋁青銅，彈簧與軸為不鏽鋼，閥座為彈性體對不鏽鋼（EPDM、NBR
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類型
升降式逆止閥
升降式逆止閥在正向流動下將活塞或球體直接抬離閥座，倒流時靠重力落座，行程短且確定，適合緊湊的高壓管線。產品範圍涵蓋法蘭系列 DN15 至 DN300，Class 150 至 Class 900（PN16 至 PN100），閥體涵蓋碳鋼、低合金鋼與奧氏體不鏽鋼結構自 WCB 至 CF3M，閥蓋為 A105 至 F316L
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類型
斜盤式逆止閥
斜盤式逆止閥使閥盤繞偏置軸樞轉，低正向流量下閥盤即提前開啟，並隨流動方向傾斜關閉而非逆流關閉——大型供水與公用管線以此保持低水擊噪音。產品範圍涵蓋大口徑系列 DN250 至 DN1400，額定 PN1.0 至 PN2.5，閥體與閥盤為球墨鑄鐵或鑄鐵，軸為 SS420/SS431，閥體閥座 SS304，閥盤密封環 EPD
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類型
壓力自緊式旋啟逆止閥
壓力自緊式旋啟逆止閥以管線壓力本身加載閥蓋墊片，因此電力與高壓製程廠在螺栓閥蓋結構需要笨重法蘭的場合採用它。產品範圍涵蓋 DN65 至 DN350，Class 1500 至 Class 2500，閥體、閥盤與鉸鏈為 WCB、WC1、WC6 或 WC9，閥座 A105/F22 配 SS316+石墨墊片。設計依 API 6
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類型
軸流式逆止閥
軸流式逆止閥沿流動軸線關閉一片彈簧輔助、流線型閥盤，倒流在加速之前即被阻止——這是高速管線的無水錘選擇。產品範圍涵蓋 NPS 2" 至 60"（DN 50 至 DN 1500），ASME Class 150 至 2500（PN 16 至 PN 420），閥體為碳鋼、不鏽鋼、合金鋼與雙相不鏽鋼，端接為 RF、BW 或 R
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類型
底閥（foot valve）
底閥是安裝在吸入管線入口的逆止閥，泵停止時阻擋水柱倒流以保持泵灌水；內部濾網防止雜物進入葉輪。規格為 DN 50 至 DN 300，PN 16 / Class 150，閥體為鑄鐵、球墨鑄鐵、SS304 或 SS316，閥盤為碳鋼、不鏽鋼、SS304 或 SS316，閥座 F304/F316，濾網 SS304；小口徑黃銅
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類型
三用閥（triple duty）
三用閥將三項泵出口功能合併於一個 1/4 迴轉閥體內——標定流量平衡、防撞擊逆止與確定關斷——節省機房空間、安裝工時以及三閥歧管的額外法蘭接點。廠商範圍為 DN65-DN300 鑄鐵，直通與角式結構，端接法蘭、螺紋或溝槽；引用結構為 1-1/2 至 16 in，額定自分銷商目錄管路的 175 psi WOG 至最強參考
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類型
靜音式逆止閥
靜音式逆止閥在倒流加速之前即予阻止：彈簧輔助閥盤以短行程安靜落座，避免傳統旋啟式逆止閥的撞擊與水錘——這正是該型式名稱的由來。美式結構對應 MSS SP-126 鋼製軸向彈簧輔助中心導向逆止閥；歐洲供水結構按 EN 12334 設計，法蘭依 EN 1092，驗收依 EN 12266-1，軸流對夾閥體面距依 API 59
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