API · ASME · DIN · EN 規格対応の産業用バルブ
サイレントチェックバルブ
サイレントチェックバルブは逆流が加速する前に止めます。スプリング補助のディスクが短ストロークで静かに着座し、従来スイング型のスラムや水撃を回避します。この動作がタイプ名の由来です。米国仕様は鋼製インラインスプリング式センターガイドチェック弁のMSS SP-126に整合、欧州の水道仕様はEN 12334設計+EN 1092フランジ+EN 12266-1受入、ウェーファーアキシャルフロー型はAPI 594面間に準拠します。代表クラス範囲はDN50～DN600（2"～24"）、PN10～PN40 / ANSI Class 125～300、鋳鉄・ダクタイル鋳鉄・WCB炭素鋼・CF8Mステンレス。端接続はRFQ時に仕様ごとに確認。ダクタイル鋳鉄製水用の代表仕様はDN50～DN400、PN10/16/25、水/グリコールで-10℃～110℃です。開弁はソフトスプリング設計でおよそ0.5psi差圧から始まり約1.0psiで全開、ソフトシートは気泡レベルの締切、流線形の短ストロークトリムが低損失とシートの迅速交換を実現します。スプリング閉止により設置姿勢への許容が高い（下向き自然流除く）一方、重力式ティルティングディスク比でわずかに圧力損失が増え、ディスクのストロークがシート上の異物除去に役立ちます。選定は管内流速に対する口径、圧力クラス、端接続、シート材、流体温度です。
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： 2026-10
ファミリー仕様
| Nominal valve connection size | DN50-DN600 (2in-24in) |
|---|---|
| Pressure class / nominal rating designation | PN10-PN40 / ANSI Class 125-300 |
| Valve body material | cast iron, ductile iron, WCB carbon steel, CF8M stainless |
| closing mechanism | Closure is spring-assisted: the spring drives the disc onto the seat before reverse flow can accelerate, which is what removes the slam and water-hammer behaviour of swing, tilting-disc and double-door checks. |
| opening differential | Typical opening behaviour for spring silent checks is a start of opening at roughly 0.5 psi differential with full opening around 1.0 psi, so the valve responds to low forward flow without chattering. |
| cracking pressure by design | Cracking pressure depends on the closing design: gravity-closed tilting-disc checks open near 0.5 psi, while spring-loaded executions typically need about 5 psi, with adjustable springs available on some models. |
| standards mss sp126 | In the US frame, silent check valves are covered by MSS SP-126 for steel in-line spring-assisted centre-guided check valves. |
| standards en frame | In the European water-works frame the same family is designed to EN 12334, with flange drilling to EN 1092 (PN10/16/25); wafer executions follow API 594 face-to-face and DIN-flanged executions MSS SP-125 short-globe face-to-face. |
| API 594 face-to-face applicability note | Wafer-style axial-flow silent checks are dimensioned to API 594 face-to-face so they fit between mating flanges without pipe changes. |
| Test acceptance criteria | Pressure acceptance on the referenced EN executions is seat testing at 1.1 times rated pressure and body testing at 1.5 times, per EN 12266-1. |
| size class envelope | A representative ductile-iron flanged execution covers DN50-DN400 at PN10/16/25; the tenant catalogue band (DN50-DN600, PN10-PN40 / ANSI 125-300) spans multiple OEM envelopes rather than one. |
| temperature envelope | The epoxy-coated ductile-iron water execution is rated for water and glycol mixtures from -10 C to 110 C; higher-temperature service moves to steel bodies and metal seats. |
| Trim material | In the referenced ductile-iron execution the body is GJS-500-7, seat and disc are stainless steel 1.4308, the closing spring is 1.4301, seals are EPDM and internal/external surfaces carry fusion-bonded epoxy coating. |
| seat options | Seat selection spans soft seats for bubble-tight shutoff and metal seats for durability and high temperature tolerance, soft-seat temperature limits follow the elastomer rather than the body. |
| media scope | Spring silent checks serve liquid, gas and steam service; the referenced water-works executions are limited to clean neutral liquids such as water and glycol mixtures. |
| orientation | Installation is flexible across horizontal and vertical lines; the spring, not gravity, returns the disc, so orientation does not change closing behaviour. |
| orientation limit | The one orientation caveat is gravity: on vertical lines with upward flow spring checks work in any orientation, but a check valve cannot close reliably against downward gravity flow. |
| head loss design | Head loss is controlled by a streamlined internal contour plus a light disc on a short stroke, and the same fast-closing spring design is what mitigates slamming. |
| spring drag dp | The spring adds a modest pressure-drop penalty compared with a gravity tilting disc, which is the trade for predictable spring-determined closure timing. |
| self cleaning | Disc travel under spring action helps dislodge debris from the seat area, so spring checks tolerate moderate solids better than gravity-tilted designs. |
| maintainability | The seat is designed for quick trim replacement in line, reducing turnaround when the seat erodes. |
| compact wafer savings | Wafer-body silent checks sandwich between standard flanges and save up to roughly 80 percent of the space and weight of a flanged swing check, cutting support load on large lines. |
| outlet butterfly mounting | On sizes up to and including DN200 the referenced design allows a butterfly valve to be mounted directly at the silent check valve outlet without adapter pieces. |
| peer threaded style sizes | Threaded Style available in sizes 1/2"-2" |
| peer wafer style sizes | Wafer Style available in sizes 2"-10" |
| peer globe style sizes | Globe Style available in sizes 2 1/2 ”- 42” |
| peer clean water scope | Ideal for clean water service - contact factory for other service |
| peer lead free certification | NSF 372 Certified Lead-Free - Globe Style |
| peer drinking water certification | NSF 61 Certified for Drinking Water - Globe Style |
| peer fm approval wafer | FM Approved Wafer Style - 2" to 10" |
| peer mss sp125 conformance | Meets MSS-SP 125 |
| peer seating construction | Precision metal-to-metal seating |
| peer disc guidance | Double guided disc - prevents vibrations and wear |
| peer resilient seat option | Resilient Seat - available for zero leakage |
| peer spring cycle rating | Heavy Duty Spring is tested for over 100,000 cycles |
| peer center guided design | center guided single disc and stainless to stainless seating with special stainless steel spring control to insure positive, noiseless opening and closing. |
| peer flange class fit | Rated to both 125 lb. And 250 lb. Flange class |
| peer activation dp | Activated at 1/4 to 1/2 psi |
| peer flow area design | Designed with larger-than-pipe-size flow area for low pressure loss with maximum efficiency. |
| peer service liquid only | Intended for liquid service only. |
| peer bolt circle fit | Fits both 250# Class bolt circle and 125# Class bolt circle. |
| peer globe style size range | Made in fourteen standard sizes: 2-1/2′′ through 30′′ |
| peer butterfly mating execution | 2-1/2′′ through 10′′ valves mate to wafer-style butterfly valves without use of spool pieces or other adapters. |
| peer companion flange drilling | Specify drillings to meet either 125/150 lb. or 250/300 lb. companion flanges. |
| peer spring closure sequence | When the pump stops and the flow ceases, the force of the spring will automatically close the disc prior to flow reversal. This creates a positive shutoff against flow reversal and minimizes system surges and water hammer. |
| peer disc opening trigger | When the pump starts and the downstream flow creates the required pressure drop in the forward direction, the disc will automatically open. |
範囲と出所の注記
| cracking pressure | Cracking pressure: DFT states its silent checks start opening at ~0.5 psi differential (full open ~1.0 psi), while the industry-reference tilting-disc frame lists ~5 psi for spring-loaded executions - opening threshold depends on spring sizing and design family, not a single industry value. |
|---|---|
| face to face framing | Face-to-face framing: wafer axial-flow executions follow API 594 while the referenced EN ductile-iron execution follows MSS SP-125 short-globe dimensions - standard depends on body execution, not on the silent-check type. |
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
サイレントチェックバルブ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。
サイレントチェックバルブ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。
サイレントチェックバルブ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。
サイレントチェックバルブ 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。