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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 PN10 結構（螺紋或圓柱式）涵蓋家用供水與供暖用途。代表性的供水結構為 EN-GJL-250 鑄鐵閥體、80 微米環氧塗層、不鏽鋼軸向閥盤與彈簧、EPDM 閥座與鍍鋅鋼濾網，法蘭 PN16 RF DN50-DN250，額定 -10 至 110 C / 16 bar，約 0.3 bar 開啟，並規定垂直安裝、以流向箭頭標示流路。濾網目數依水源而定——井水用密目網，潔淨取水用疏目網或穿孔管。該型式特有的失效路徑為閥座洩漏或吸氣管漏氣表現為失水、濾網堵塞表現為流量偏低，以及髒介質污染橡膠-金屬閥座；安裝應距彎頭與泵約 10 倍管徑，並將數據表、測試報告、材質證明與流向標示視為潛水應用的關鍵文件。
屬於 逆止閥 系列
最後更新： 2026-11
系列規格
| Nominal valve connection size | DN50 to DN300 |
|---|---|
| Pressure class / nominal rating designation | PN16, Class150 |
| Valve body material | Cast Iron, Ductile Iron, SS304, SS316 |
| Disc Materials | Carbon Steel, Stainless Steel, SS304, SS316 |
| Seat material | F304, F316 |
| End connection types | Flanged |
| Operation / closure mode | Self-acting (automatic) |
| mesh material | SS304 |
| Materials (component scope as published) | Cast Iron, Ductile Iron, SS304, SS316 |
| function definition | A foot valve is a non-return valve installed at a pump suction or the bottom of a pipeline so water cannot flow backward when the pump stops; on the referenced execution an axial stainless disc with spring does the closing. |
| priming mechanism | Priming works because the spring-assisted check closes on a pressure continuum the moment the pump stops, trapping the liquid column in the pipe before backflow starts - without that trapped liquid most pumps cannot rebuild suction and can run dry. |
| strainer jamming risk | Using a bare check valve without the strainer risks debris lodging the closure member open - the liquid then drains back, and the same debris can travel downstream and damage the pump. |
| mesh selection | Mesh tightness follows the water source: wells with fine particulates need a fairly tight mesh, while clean draws can run an open mesh or even a perforated-pipe strainer. |
| pn16 execution envelope | A representative PN16 execution: EN-GJL-250 cast iron body with epoxy coating, stainless steel disc and spring, EPDM seat, galvanized carbon steel strainer, flanged PN16 RF, DN50-DN250, -10 to 110 C at 16 bar. |
| opening pressure | Opening pressure on the referenced spring execution is about 0.3 bar, sized to open under pump suction yet reseat promptly at shutdown, with low head loss through the trim. |
| coating spec | Corrosion protection on the referenced water-works execution is epoxy blue RAL 5005 at 80 microns, internal and external. |
| vertical orientation | The flanged PN16 execution is specified for vertical installation, with the flow-direction arrow on the body marking the permitted flow path. |
| brass pn10 variant | Small-diameter executions extend to brass: PN10 brass foot valves with strainer in threaded or cylindrical patterns alongside cast iron flanged PN16 bodies, covering domestic water, heating and air-conditioning plants. |
| installation clearance | Placement rule from the referenced maker: near bends and circulation pumps the valve must sit at a distance of about 10 pipe diameters, with pipes correctly aligned and thread sealant kept off the rubber-metal sealing zone. |
| fluid cleanliness limit | Rubber-metal sealing is the soft spot: dirt, dust or excessive water hardness reaching the seat area compromises sealing, so such media must be removed or filtered upstream. |
| check vs foot scope | Scope note: every foot valve is a check valve, but the job is narrower - hold the suction column and screen debris at the submerged inlet - while a general check valve is placed anywhere reverse flow must stop. |
| submerged access penalty | The failure modes concentrate where access is worst: a submerged foot valve that is hard to remove is cheap to buy but expensive to clean, and seat leakage, strainer clogging or an air leak in the suction pipe each present as loss of prime. |
| loss of prime symptoms | Loss of prime after shutdown points at seat leakage or a suction-pipe air leak rather than automatically at the foot valve - seat condition, pipe joints and suction-lift height should be checked together. |
| standards document expectation | Documentation that matters more than a standards list for this duty: datasheet, pressure test report, material certificate, flow-direction marking and a maintenance note covering the submerged installation. |
| selection frame | Selection turns on suction lift, debris load, pressure loss, closing speed and maintenance access: flooded suction may not need a submerged valve at all, while suction lift from sump, tank, reservoir or well depends on the intake valve to keep the line full. |
| mesh | SS304 |
| carbon steel materials | Carbon Steel: WCB (ASTM A216) — General water and utility pumping |
| low temp carbon steel materials | Low Temperature Carbon Steel: LCB, LCC (ASTM A352) — Cold water and low-temperature service |
| alloy steel materials | Alloy Steel: F11, F22 (ASTM A182) — High-pressure pumping and industrial service |
| stainless steel materials | Stainless Steel: CF8, CF8M (ASTM A351) — Corrosive water and chemical service; Stainless Steel: F316, F316L (ASTM A182) — Aggressive water and coastal applications |
| duplex stainless steel materials | Duplex Stainless Steel: F51 (2205) (ASTM A182) — Chloride-rich and high-strength service |
| super duplex stainless steel materials | Super Duplex Stainless Steel: F53, F55 (2507) (ASTM A182) — Offshore and severe corrosion service |
| aluminium bronze materials | Aluminium Bronze: C95400, C95800 (ASTM B148) — Marine, seawater, and raw water intakes |
| nickel alloy materials | Nickel Alloys: nickel-chromium alloy 625, nickel-copper alloy 400 (ASTM B564) — Severe corrosion and special pumping service |
| industries served | Water supply systems – well pumps and suction lines, Irrigation networks – canal and sump pumping, Fire protection systems – suction lines and reservoirs, Industrial utilities – cooling water and process pumping, Marine and offshore – seawater intakes and bilge systems, Wastewater treatment – lift stations and raw sewage pumping |
| selection factors | Suction pipe diameter and orientation, Vertical lift and static head, Required opening pressure and flow rate, Type and size of debris present, Screen open area and blockage risk, Installation depth and accessibility, Maintenance and cleaning frequency |
範圍與來源備註
| size envelope | Size envelope: tenant band DN50-DN300 exceeds the referenced PN16 flanged execution DN50-DN250 - the top of the tenant band relies on other OEM executions (e.g. cast iron flanged PN16 larger bodies) not evidenced in this round. |
|---|---|
| seat material split | Seat material split: existing trim list is F304/F316 metal seats, while the referenced water-works execution seals on EPDM with a rubber-metal seat pairing - both executions exist; elastomer selection sets the temperature ceiling (-10 to 110 C on the EPDM build). |
| mesh guidance | Mesh guidance: tight-mesh recommendation for wells vs open mesh/perforated pipe for clean draws - strainer choice is media-dependent, not a single catalogue setting. |
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
底閥（foot valve）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。
底閥（foot valve）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。
底閥（foot valve）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。
請求底閥（foot valve）報價
在此提交需求——可直接報價的詢問應說明適用標準與等級、口徑、材質、介質、溫度與目的地.
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