逆止閥 · 雙瓣逆止閥（dual plate）
對夾雙瓣逆止閥
對夾雙瓣逆止閥是雙瓣原理的緊湊對夾版本：兩片彈簧關閉的半閥瓣繞中心鉸軸擺動、短行程關閉，關閉快且撞擊傾向低，幾乎不佔用面距長度。基準頁聲明 DN50 至 DN900，Class 150 至 Class 2500，閥體自鑄鐵至不鏽鋼與鋁青銅，彈簧與閥桿不鏽鋼，閥座材料為彈性體或金屬（EPDM、NBR、VITON、CF8、CF8M）。
屬於 雙瓣逆止閥（dual plate） 系列
最後更新： 2026-11
規格
| Valve body material | Cast Iron, Ductile Iron, Cast Steel, Stainless Steel, Aluminium Bronze |
|---|---|
| Disc Materials | Ductile Iron, Stainless Steel, Aluminium Bronze |
| spring materials | Stainless Steel |
| Stem material | Stainless Steel |
| Seat material | EPDM, NBR, VITON, CF8, CF8M |
| Nominal valve connection size | DN50 to DN900 |
| Pressure class / nominal rating designation | Class 150 to Class 2500 |
| Face-to-face dimensional standard | API 594, ASME B16.10 |
| Flange standards | ASME B16.10 |
| Inspection and pressure-test standards | API 598 |
| Service temperature range | -40°C to +230°C |
應用與選型指引
Select the wafer execution where line length and weight matter - pump discharges and retrofits between existing flanges - and the dual plate closes fast enough to limit surge without a dedicated non slam device. Size inside DN50 to DN900 against the line class up to Class 2500, pick the seat compound for the medium and temperature (elastomers for water and general duty; confirm metal-seated options for hot or abrasive service), and match the face-to-face to API 594 so the clamp length fits the mating flanges.
常見問題
Dual plate wafer check vs conventional swing check - when does the wafer execution win?
The wafer body clamps between flanges with a very short face-to-face (API 594), cutting weight and space, and the twin spring-assisted plates close with short travel so slam and surge are reduced. Conventional swing checks remain simpler and cheaper where space is not constrained. Choose by the space, weight and surge limits of the installation rather than by habit.
Which seat compound should I pick?
The benchmark page lists EPDM, NBR and VITON elastomer seats alongside CF8 and CF8M metal seat options. EPDM suits water and most neutral media, NBR covers oils, VITON extends the temperature and chemical window, and the metal options take hot or abrasive service. Confirm the medium and temperature before fixing the compound.
What information is needed to quote a dual plate wafer check valve?
Nominal size within DN50 to DN900, pressure class up to Class 2500, body preference from the declared range (cast iron, ductile iron, cast steel, stainless steel, aluminium bronze), seat compound, and the mating flange standard. Those points define the execution and clamp length for a quotation-ready inquiry.
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。