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夾套保溫蝶閥

夾套保溫蝶閥使在常溫下會凝固、結晶或變稠的介質保持流動狀態：閥體帶完整加熱夾套，蒸汽、導熱油或熱水在其中循環，使瀝青、硫磺、巧克力、蠟與黏合劑直到蝶盤處都保持液態。口徑範圍、壓力覆蓋、閥體材料與端接在報價時按口徑與結構確認；夾套介質與溫度依製程條件選定。夾套結構按覆蓋度分級：部分夾套經標準法蘭加熱閥體中段，全覆蓋夾套使用比管徑大一至兩個規格的連接法蘭，等徑夾套焊接到標準法蘭——因此面距按 ISO 5752「或經認可的製造商圖紙」報價，熱媒接口自小閥的 1/2 吋 NPT 增至 8 吋以上閥體的 1 吋。堆焊硬質密封面的金屬閥座承載 -29 至 425 °C 材料相關區間的高溫端。失效路徑偏熱學而非機械：外夾式夾套留下氣隙冷點使介質凝固，蝶盤邊緣積料阻礙開關，軸承處凝固介質卡死閥桿——蒸汽伴熱閥桿與密封軸承設計可解決最後一項。安裝時夾套介質一端進、對側出，環形空間依冷熱點定尺寸；驗收為雙向的：夾套水壓依 ASME B31.1，製程側依 API 598。產品標準為蝶閥標準（API 609、MSS SP-68、EN 593），夾套殼體遵循管路實務（ASME B31.1/B31.3、B16.34）；夾套高性能結構可達 Class 600，壓力-溫度限值依 B16.34。選型取決於夾套加熱介質與溫度、閥體與閥座材料對介質化學性質，以及驅動方式——手動、氣動或電動。

屬於蝶閥系列

最後更新： 2026-10

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系列規格

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.

範圍與來源備註

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".