閘閥 · 刀型閘閥（knife gate）
雙向刀型閘閥
依 MSS SP-81 的雙向刀型閘閥結構：閘板在兩個流動方向均密封，安裝時無需考慮流向——與標準單向刀閘在製程撬裝與配水集箱上的實際差異。DN50 至 DN400，對夾或凸耳閥體，PTFE 填料配聚氨酯/EPDM/NBR/Viton 密封環，手輪或執行器操作。
屬於 刀型閘閥（knife gate） 系列
最後更新： 2026-11
規格
| Valve body material | Carbon Steel, Ductile Iron, SS316 |
|---|---|
| knife materials | SS304, SS316 |
| Disc Materials | SS304, SS316L |
| wedge materials | SS304, SS316, SS316L |
| packing | PTFE |
| seal ring materials | Polyurethane, EPDM, NBR, VITON |
| yoke materials | SS304, SS316 |
| packing gland materials | CF8, WCB |
| Nominal valve connection size | DN50 to DN400 |
| Pressure class / nominal rating designation | Class 150 to Class 30, PN10 |
| end types | Wafer Type, Lug Type |
| Operation / closure mode | Handwheel, Electric Actuated, Pneumatic Actuated |
| Design standards | MSS SP-81 |
| Face-to-face dimensional standard | MSS SP-81 |
| flanged end standards | DIN, JIS |
| Inspection and pressure-test standards | API 598 |
| seat design | Bi-Directional Resilient Seated, patented perimeter seat design, bubble-tight shutoff in either direction, even on dead end service |
| body construction | One piece cast body |
| applications | isolation and on/off applications, paper, chemical, mining, power, waste water industries |
| media | clean, dirty, viscous and corrosive liquids, sludge, fibrous slurries, clean and corrosive gases |
| design standard options | MSS SP-81, ANSI, API, ISO, DIN, EN, JIS |
| end flange standard | ASME B16.5, ASME B16.47, DIN2533 |
| flange rating options | EN1092 PN10,PN16,PN25, ANSI B16.5 (class 125,150) |
| operation options | Handwheel, Gear, Pneumatic, Hydrau-Pneumatic, Electric |
| body material options | Ductile Iron, Cast Steel, Stainless Steel, Duplex and Special Alloys |
| gate material options | Stainless Steel, Duplex and Special Alloys |
| Service temperature range | -29°C to 120°C |
Pressure class is shown as collected: "Class 150 to Class 30, PN10". The source text's "Class 30" is retained verbatim as a recorded source difference — it is commonly read as a typographical variant of Class 300, but that reading is not asserted here; the governing class is confirmed at quotation.
應用與選型指引
Specify bi-directional sealing where installation orientation is a real constraint - pump suction headers, manifolds and retrofits where flow direction may reverse or was never fixed. End type decides maintenance philosophy: wafer needs the line drained on both sides, lug allows one side to stay pressurised while the downstream spool is removed.
常見問題
What does bi-directional sealing change in practice?
A standard knife gate seats on one side only and must be installed with flow against that seat; the bi-directional execution seals either way, so orientation errors and flow-reversal scenarios stop being a risk. The benchmark page covers DN50-DN400 at Class 150 / PN10 in wafer and lug bodies.
Which materials are offered?
Body in carbon steel, ductile iron or SS316; knife and wedge in SS304/SS316; PTFE packing with seal-ring options in polyurethane, EPDM, NBR and Viton - the elastomer pick should follow the medium and temperature.
Which standard governs the valve?
Design, manufacture and face-to-face dimensions to MSS SP-81, flanged ends to DIN and JIS, inspection and test to API 598, with a full DN50-DN400 dimension and weight table on the page.
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。