API · ASME · DIN · EN 規格対応の産業用バルブ
フートバルブ（底弁）
フートバルブは吸込管の入口に設置する逆止弁で、ポンプ停止時に水柱の逆流を防ぎポンプのプライミング保持を担い、内蔵のストレーナメッシュがインペラへのゴミ侵入を防ぎます。サイズはDN50～DN300、PN16 / Class 150、ボディは鋳鉄・ダクタイル鋳鉄・SS304・SS316、ディスクは炭素鋼・ステンレス鋼・SS304・SS316、シートはF304/F316、ストレーナメッシュはSS304。小口径の真鍮PN10仕様（ねじ込みまたは筒状）が家庭用給水・暖房用途をカバーします。代表的な水道仕様はEN-GJL-250鋳鉄ボディ+80ミクロンエポキシ塗装、ステンレスのアキシャルディスクとスプリング、EPDMシート、亜鉛メッキ鋼ストレーナ、フランジPN16 RF DN50～DN250、16barで-10～110℃、開弁圧およそ0.3bar、流向矢印付き垂直据付仕様です。メッシュの目詰まり度は水源により選定（井戸は細かいメッシュ、清浄水は粗いメッシュや穴あき管）。特有の故障経路はシート漏れや吸込管の空気吸入（primes喪失）、メッシュ詰まり（流量低下）、汚れた流体によるゴム-金属シートの汚染です。曲がりやポンプからおよそ10管径離して設置し、水中用途ではデータシート、試験報告書、材料証明書、流向表示が重要書類となります。
次のファミリーに属する： チェックバルブ ファミリー
最終更新： 2026-11
ファミリー仕様
| 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 |
範囲と出所の注記
| 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. |
注文と書類
書類
お問い合わせの際に必要な書類セットをお知らせください——この型番仕様の典型的な項目（材質証明書、記載の検査規格に基づく試験報告書、寸法図）は、見積時に確認のうえ供給されます。
お見積り
見積可能なお問い合わせには次の事項をご記入ください：呼び径と圧力レーティング、ボディ・シート材質の希望、接続方式、操作方式、温度を含む使用流体。このページの典型値はベンチマーク参考範囲です。拘束力のある値は見積時に確定します。
サンプルと供給
供給条件、発注数量、納期は注文ごとに協議します——お問い合わせの際に納入国と希望スケジュールをお知らせください。
保管と輸送
バルブはシート・シールを紫外線、オゾン、変形から保護して保管し、据付まで端面保護カバーを取り付けたままにしてください。エラストマーまたは PTFE シートの仕様では、屋外での長期保管を避けてください——シート材料は直射日光と凍結条件で最も劣化が早くなります。
よくある質問
フートバルブ（底弁）の見積依頼には何を含めるべきですか？
適用規格とクラス、呼びサイズ、ボディおよびシート材、使用媒体と温度、納入先——欠落している項目は見積の過程で確認します。
フートバルブ（底弁）にはどのサイズと圧力等級がありますか？
このバルブの検証済みサイズと圧力等級範囲はまだ本ページに掲載されていません——お客様の使用条件に適したサイズと圧力等級は見積の過程でご提案し、確認します。使用条件を問い合わせに添えていただければ、選定結果を見積書に記載します。
フートバルブ（底弁）にはどのボディ材質がありますか？
このバルブの検証済みボディ材質範囲はまだ本ページに掲載されていません——お客様の使用条件に適したボディ材質は見積の過程でご提案し、確認します。使用条件を問い合わせに添えていただければ、選定結果を見積書に記載します。
フートバルブ（底弁） の見積依頼
こちらからご要望をご提出ください——見積に直結するお問い合わせには、適用規格とクラス、口径、材質、流体、温度、納入先をご記入ください.
お客様の情報の取り扱いについては、プライバシー通知をご覧ください。