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ジャケット付きバタフライバルブ
ジャケット付きバタフライバルブは、常温で固化・結晶化・増粘する流体を流動状態に保ちます。ボディが全面加熱ジャケットを備え、蒸気・熱媒油・温水が循環するため、アスファルト・硫黄・チョコレート・ワックス・接着剤がディスクまで液状を維持します。サイズ範囲、クラス適用、ボディ材質、端接続はRFQ時に口径・仕様ごとに確認し、ジャケットの媒体と温度はプロセス条件に対して選定します。ジャケット構造は被覆率で分級されます。部分ジャケットは標準フランジ越しにボディ中間部を加熱、全被覆ジャケットは管サイズより1～2サイズ上の接続フランジを使い、ラインサイズのジャケットは標準フランジに溶接します。このため面間はISO 5752「または承認済みメーカー図面」として引用され、熱用ポートは小型弁の1/2インチNPTから8インチ以上ボディの1インチへ段階的に変わります。硬化面付きメタルシートが材料依存の-29～425℃レンジの高温側を担います。故障経路は機械的ではなく熱的なものです。クランプオン式ジャケットは空気層の低温点を残して流体が固化し、ディスク縁への生成物付着が開閉を妨げ、シャフトベアリング部の固化物がステムを拘束します—最後の対策がステムのトレーシングとシールドベアリング設計です。据付ではジャケット媒体を片側入口・反対側出口で環状空間を冷热点・热点に応じて設計し、受入は2面で実施します。ジャケットはASME B31.1の水圧試験、プロセス側はAPI 598です。製品規格はバタフライ系（API 609、MSS SP-68、EN 593）、ジャケット殼は配管慣行（ASME B31.1/B31.3、B16.34）に従い、ジャケット付き高性能仕様はB16.34の圧力-温度限界の下でClass 600まで対応します。選定はジャケット加熱媒体と温度、流体化学に対するボディ・シート材、操作方式（手動・空圧・電動）です。
次のファミリーに属する： バタフライバルブ ファミリー
最終更新： 2026-10
ファミリー仕様
| jacket coverage design types | Jacketed valve executions are commonly grouped by coverage: a partial jacket heats only the valve mid-section with standard flanges, a full-coverage jacket uses flanges one nominal size above the valve size, and a line-size full jacket welds to standard flanges with tapped bolt-hole inserts. Shorter end-to-end variants of each also exist. |
|---|---|
| jacket flange oversize effect | Because the jacket adds wall thickness around the body, the connecting flanges of a jacketed butterfly valve are typically one to two nominal sizes larger than the equivalent unjacketed valve; final flange dimensions must be taken from the approved manufacturer drawing rather than assumed from the line size. |
| jacket pressure and medium separation | The jacket pressure rating, heating-medium temperature and connection size are not fixed catalog values: they must be confirmed against the process conditions for each application. The heating medium must also remain fully separated from the process medium, so jacket integrity is a containment requirement, not only a heat-transfer one. |
| jacket thermal port sizing | Thermal (steam) port size is scaled to valve size: roughly half-inch NPT on small valves, three-quarter-inch on mid sizes, and one-inch NPT on valves of about 8 inch and larger. Threaded ports are standard on fabricated jackets, with flanged jacket connections available on request. |
| jacket heating medium options | Steam is the most common jacket heating medium, but hot thermal oil is also used, and jacketed valves can serve cooling duty with cold water or chilled glycol. Manufacturer selection checklists therefore ask explicitly whether the jacket medium is steam or hot oil, together with its pressure and temperature. |
| temperature range material dependent | Published temperature limits for jacketed metal-seated butterfly valves run to about 425 C, but the applicable ceiling depends on body/trim material and the sealing configuration rather than being a single valve rating. Soft-seated executions share this envelope only in their lower part; metal seating with hard-faced surfaces carries the high end. |
| hardfaced metal seat for hot service | In jacketed executions the seat faces are typically metal, with the disc sealing surface hard-faced with a cobalt-based alloy to resist wear at elevated temperature; stainless seal rings combine hard-metal and elastic sealing behavior across the low- and high-temperature ends of the range. |
| partial jacket cold spots | Add-on (clamp-on) jackets can leave air gaps between the jacket and the valve body; these cold spots let the media solidify and accumulate locally, which is why integral welded jackets that keep steam in direct contact with the body give more reliable heating on solidifying service. |
| disc edge buildup blocks closure | A thin layer of solidified product on the disc edge can prevent the valve from opening or closing, while buildup on the disc face alters its flow-control behavior. Heating only the body does not protect the disc; designs that trace steam around the disc circumference address this failure path. |
| shaft bearing solidification binding | The shaft/bearing area is the most vulnerable point for media buildup: even a small amount of solidified flow material on a bearing surface causes binding and wear. Steam-traced or purged stem designs, and sealed bearings, are countermeasures; without them, conventional body-only jacketing leaves the shaft cold. |
| clamp on jacket valve failure risk | Reliance on conventional clamp-on jacketing is itself a failure mode: where heat transfer is poor, sulfur-type media can still solidify inside the valve and the buildup leads to valve failure, particularly where shafts and discs sit far from the heat source. |
| annular space hot cold spots prevention | For fabricated jackets, maintaining sufficient annular space between the valve exterior and the inner jacket wall keeps the thermal fluid flowing unobstructed; collapsing or under-sizing this gap produces temperature inconsistencies and hot or cold spots across the heated surface. |
| jacket flow path through both connections | The jacket is routed with an inlet on one side of the body and an outlet on the opposite side, so the heating medium circulates around the body before leaving; jacket connections are installed on both body sides, and coupling size and connection form (threaded or flanged) must be specified at ordering. |
| jacket hydrostatic test and asme compliance | Fabricated jacket welds are executed to ASME B31.1/B31.3 practice with code-qualified welders, and after fabrication the jacket space is hydrostatically tested per ASME B31.1 while the process side is tested to API 598, a two-sided acceptance sequence worth requiring in purchase specifications. |
| jacketed design and flange standards | Triple-offset metal-seated butterfly valves of the type used for jacketed executions are designed to API 609, MSS SP-68 and EN 593; connecting flanges conform to ASME B16.5/B16.47, ISO 7005 or EN 1092, face-to-face to API 609/ISO 5752/EN 558, and testing to API 598 / ISO 5208. The jacket shell additionally follows piping practice (ASME B31.1/B31.3, B16.34). |
| face to face deviation for jacketed bodies | Face-to-face dimensions nominally follow ISO 5752 (and API 609/EN 558), but jacketed bodies frequently deviate from the standard table; suppliers state conformance as ISO 5752 or approved manufacturer drawing, so buyers must verify face-to-face against the jacketed drawing rather than the standard. |
| pressure class envelope of jacketed butterfly | Steam-traced jacketed high-performance butterfly executions are offered in ASME B16.34 pressure classes including Class 150 (with a derated 150DR variant), 300 and 600, in sizes from 6 to 48 inch, confirming that the jacket does not confine the product to a single class while pressure-temperature limits are taken from B16.34. |
| jba triple point heating | triple-point prevention of media solidification in the shaft and bearings, the valve body and the disc |
| jba steam through stem | steam flows directly through the stem, fully heating the bearing area |
| jba welded shaft disc interface | There is a welded interface between the shaft inlet and disc passage forming a single, integral unit, so there is no chance for steam to leak into the piping system. |
| jba disc perimeter steam path | channels the continuous steam flow from the top shaft, around the full perimeter of the disc, and out the bottom shaft |
| jba steam contact area advantage | 200% greater steam contact area |
| jba integral jacket installation | There is no chance for assembly errors in the field and there is no need for messy thermal contact cement. |
| jba design patents | Three specific U.S.A. patents have been issued based on this design (4559967, 4418889, and 4289296). |
| jba optional configurations | Optional bearing purge (steam or alternate media) Optional sealed bearings Optional double-packed stems with lantern rings Optional fire tested and high-temperature seat designs |
| jba three point system | a full 3-point valve heating system including the stem, body, and disc |
| jbb reduced port jacketed piping | Reduced Port Valves to match reducing flanges where jacketed piping systems are required. Valves can be steam jacketed and equipped with steam traced shafts, if required. |
| jbb sulphur pitch execution | Steam Jacketed Valves with steam traced shafts for molten sulphur and pitch applications |
| jbb ordering feature codes | J = Steam jacket, T = Steam-traced shaft |
| jbb jacketed when required by application | Steam jacketed and steam traced shafts when required by application. No elastomers or teflon. |
| jbc feasibility factors | A lug-style butterfly valve can use a steam jacket, but feasibility depends on body geometry, flange-bolt access, allowable thermal distortion, steam-side design conditions, and the actual location of the deposit. |
| jbc sticking location diagnosis | Identify where sticking begins: body cavity, disc edge, stem bearing, or packing area. |
| jbc thermal survey points | Take simultaneous temperature readings on the upstream pipe, downstream pipe, body near both flanges, body centerline, upper and lower body regions, stem-bearing area, and packing area. |
| jbc metal temperature basis | Compare that target with measured metal temperature rather than steam supply temperature. Steam can be hot while a blocked condensate path or poor thermal contact leaves the valve cold. |
| jbc short face to face conduction | Short face-to-face valves can receive substantial conductive heat from the upstream and downstream piping. That heat path may already keep the main body warm, while exposed lugs, the stem extension, packing, actuator bracket, and ambient airflow create localized losses. |
| jbc deposit localization rule | If the deposit is concentrated around the stem bearing or packing, a full body jacket may consume steam without heating the controlling cold spot. If deposits cover the disc and internal body surfaces, localized stem heating will not address the obstruction. |
| jbc condensate drainage | Route steam and condensate so condensate drains from the low point in every installed valve orientation. Trapped condensate reduces heat transfer and can impose mechanical loads during startup. |
| jbc access and spacer rule | Preserve access to every lug, flange bolt, packing adjustment, actuator fastener, and valve-removal path. The jacket must not become a structural spacer between the valve and mating flanges. |
| jbc thermal expansion effects | Excessive or uneven heating can change bearing clearance, seat contact, disc alignment, operating torque, and shutoff performance. Account for jacket mass, steam piping loads, insulation mass, and thermal movement. |
| jbc purpose designed jacket | A purpose-designed jacketed valve or manufacturer-approved removable jacket avoids uncontrolled alteration of the original body. |
| jbc least intrusive selection | Select the least intrusive method that holds every deposit-prone surface above the defined target. |
| jbd tail gas steam jacket | Tail Gas Butterfly Valves are equipped with steam jackets to prevent media from solidifying. |
範囲と出所の注記
| jacketed flange oversize | Jacketed flange oversize: OEM pages state jacketed connecting flanges run one to two nominal sizes above the standard butterfly valve, while line-size full-jacket executions keep standard flanges via tapped bolt-hole inserts - coverage style determines whether flanges grow. |
|---|---|
| standards layering | Standards layering: butterfly product standards (API 609, MSS SP-68, EN 593, ISO 5752/EN 558 face-to-face, API 598/ISO 5208 testing) and jacket-fabrication standards (ASME B16.10/B16.34, B31.1/B31.3 jacket hydro, API 598 process side) address different layers of the same jacketed valve; face-to-face is frequently "ISO 5752 or approved manufacturer drawing". |
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
ジャケット付きバタフライ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。
ジャケット付きバタフライ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。
ジャケット付きバタフライ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。
ジャケット付きバタフライバルブ 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。