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Reliant Valve-steam jacketed valve fabrication and modification
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Steam Jacketed Valves

Valve Thermal Management Solutions

Many chemical and processing facilities operate under strict temperature control requirements. When a liquid or liquefied product becomes thermally unstable, the consequences can be costly—production delays, unplanned downtime, and even equipment damage. That’s why reliable thermal control isn’t optional—it’s essential.

At the heart of effective thermal management is proper thermal migration. Our jacketed systems are engineered to ensure smooth, unobstructed flow of the thermal fluid, allowing it to perform efficiently and consistently. By maintaining sufficient annular space between the exterior of the jacketed valve and the inner wall of the jacket, we eliminate temperature inconsistencies and hot or cold spots. The result is a highly stable, “temperature-predictable” system based on a proven Double Pipe Thermal Exchange System design.

While standard drawings and dimensions can meet basic requirements, many applications demand more. That’s where Reliant Valve stands apart. Since 1998, we have specialized in custom jacketed valve solutions—engineering products that go beyond the “standard” to meet the real-world needs of our customers. When no template exists, we rely on experience, innovation, and proven fabrication techniques to deliver dependable results.

We offer three standard fabricated valve jacket designs:

  • Type “A” – Partial Jacket with Standard Flanges
  • Type “B” – Full Coverage Jacket with Oversize Flanges
  • Type “C” – Full Jacket with Standard Flanges (Line Size Jacketing)
  • Type “D” – Any of the Above Jacketed Valves (Only Shorter End-to-End)

    • Every design can be customized to your application. Options include jacket material selection, steam port quantity and configuration, bonnet jacketing, custom take-out dimensions, and more. Whatever your process demands, Reliant Valve delivers a jacketed valve solution you can rely on—engineered for performance, durability, and peace of mind.

    Steam Jacketed Valve
    Configurations

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    Partial Jacketed Valve

    Type "A" - Standard Flange

    In this design, only the mid-section of the jacketed valve experiences direct heat transfer. The flange areas within the design are heated indirectly. The flange bolt-up is performed by a clearance between the flange and the jacket. When full jacketing is not needed, a partial jacketed valve is an effective way to keep products flowing.
    NPS (Nominal Pipe Size): 1.5″ ,2″ , 3″, 4″, 6″, 8″, 10″, 12″, 14″
    DN (Diamètre Nominal): DN40, DN50, DN80, DN100, DN150, DN200, DN250, DN300, DN350
    THERMAL PORTS: ½”–3″ valves: ½” FNPT,  4″–6″ valves: ¾” FNPT,  8″+ valves: 1″ FNPT Bonnet Jackets for Gate, Globe & Swing Check valves; flanged and other port types available.
    COMPLIANCE: ASME B16.10, ASME B16.34, ASME B31.1, ASME B31.3, API 598
    MATERIAL: Steel, Stainless Steel & Higher-Grade Nickel-Based Alloys
    INDUSTRY USE: Oil & Gas, Petrochemical, Asphalt Processing, Chemical, Sulfur Recovery & Processing, Resins, Polymers, & Plastics

    Full Jacketed Valve

    Type "B" - Oversized Flange

    This design permits steam to make contact with the valve body in addition to the area of the flange within the bolt circle. Oversized flanges are the standard for this option. Specifically, flanges should be one full size above the valve size. The final end-to-end dimensions of the jacketed valve are then compliant with the ANSI / ASME B16.10 standard for those oversize flanges. Variations on these standard designs and dimensions can be configured to meet any process requirement.
    NPS (Nominal Pipe Size): 1.5″ ,2″ , 3″, 4″, 6″, 8″, 10″, 12″, 14″
    DN (Diamètre Nominal): DN40, DN50, DN80, DN100, DN150, DN200, DN250, DN300, DN350
    THERMAL PORTS: ½”–3″ valves: ½” FNPT,  4″–6″ valves: ¾” FNPT,  8″+ valves: 1″ FNPT Bonnet Jackets for Gate, Globe & Swing Check valves; flanged and other port types available.
    COMPLIANCE: ASME B16.10, ASME B16.34, ASME B31.1, ASME B31.3, API 598
    MATERIAL: Steel, Stainless Steel & Higher-Grade Nickel-Based Alloys
    INDUSTRY USE: Oil & Gas, Petrochemical, Asphalt Processing, Chemical, Sulfur Recovery & Processing, Resins, Polymers, & Plastics

    Full Jacketed Valve

    Type "C" - Standard Flange
    (Line Size Jacket)

    Standard flanged valves can be jacketed by welding blind, tapped inserts into the oversized bolt holes on the flange. Then, the jacket is welded to the periphery of the flanges. Threaded studs are the standard for installation in this design. The steam or other heating media makes contact with the flanges and the exterior of the valve body.
    NPS (Nominal Pipe Size): 1.5″ ,2″ , 3″, 4″, 6″, 8″, 10″, 12″, 14″
    DN (Diamètre Nominal): DN40, DN50, DN80, DN100, DN150, DN200, DN250, DN300, DN350
    THERMAL PORTS: ½”–3″ valves: ½” FNPT,  4″–6″ valves: ¾” FNPT,  8″+ valves: 1″ FNPT Bonnet Jackets for Gate, Globe & Swing Check valves; flanged and other port types available.
    COMPLIANCE: ASME B16.10, ASME B16.34, ASME B31.1, ASME B31.3, API 598
    MATERIAL: Steel, Stainless Steel & Higher-Grade Nickel-Based Alloys
    INDUSTRY USE: Oil & Gas, Petrochemical, Asphalt Processing, Chemical, Sulfur Recovery & Processing, Resins, Polymers, & Plastics

    In-House
    Fabricated Valve Jackets

    Durco
    3x2x3 Plug Valve

    Full Jacket

    Full Jacket 3x2x3 Durco Plugs

    Warren
    Full Port Ball Valve

    Partial Jacket

    Full Port Warren Ball Valve - Partial Jacket

    FluoroSeal
    Plug Valve

    Partial Jacket

    FluoroSeal plug valve partial jacket

    Xomox
    Plug Valve

    Line Sized Full Jacket

    Xomox line-sized jacketed valve

    ASME Boiler & Pressure Vessel Code Certified

    As demand for jacketed valves has increased over the past several decades, we have continually expanded our capabilities to meet the evolving needs of our customers. Our fully equipped fabrication facility features comprehensive machining and welding resources, allowing us to deliver precision-engineered solutions for even the most demanding applications.

    All welding is performed by ASME Boiler & Pressure Vessel Code–certified welders, ensuring the highest levels of quality, safety, and compliance. We fabricate both full and partial weld-on jackets across a wide range of valve designs, providing flexibility to match your specific process requirements.

    Material selection is tailored to each application. In addition to carbon steel and stainless steel, we offer high-performance nickel-based alloys for environments that demand enhanced corrosion resistance, temperature stability, or chemical compatibility.

    Every valve is thoroughly tested following fabrication. Jacket integrity is verified through hydrostatic testing in accordance with ASME B31.1, and after final assembly, the process side of the valve is tested to the API 598 standard. This rigorous testing protocol ensures dependable performance, long service life, and confidence in every valve we deliver.

    Questions & Answers

    A jacketed valve is an industrial valve designed with a jacket, or outer shell, that allows a thermal medium to circulate around the external body of the valve. With precise thermal control, it helps prevent viscosity changes, solidification, and product degradation.

    Jacketed valves are required when the process media can become too viscous or solidify at operating temperature. Common applications include sulfur, asphalt, resins, heavy oils, adhesives, and pharmaceuticals.

    There are three types of steam-jacketed valves:

    1. Type “A” – Partial Jacket with Standard Flanges
    2. Type “B” – Full Coverage Jacket with Oversize Flanges
    3. Type “C” – Full Jacket with Standard Flanges (Line Size Jacketing)
    4. Type “D” – Any of the Above Jacketed Valves (Only Shorter End-to-End)

    Yes, jacketed valves in a heated process are used to keep products like heavy oils and sulfur flowing through the system. In cold service, jacketed valves are used to maintain a low temperature in the manufacturing of certain acids, pharmaceuticals, adhesives, food, and beverages.

    THERMAL PORTS: ½”–3″ valves: ½” FNPT,  4″–6″ valves: ¾” FNPT,  8″+ valves: 1″ FNPT
    Bonnet Jackets for Gate, Globe & Swing Check valves; flanged and other port types available.

    While steam is the most common heating medium, other thermal fluids, such as hot oil, are also used. For cooling a jacketed process, cold water or chilled glycol are the most common fluids used to keep the system in a precise thermal state.

    Most commodity valves can be jacketed, including:

    • Plug Valves
    • Ball Valves
    • Gate Valves
    • Globe Valves
    • Check Valves
    • Sample Valves
    • Diverter and Multiport Valves
    • Control Valves

    Configurations: Flanged End, Butt-Weld End, SW or TH End. Bonnet Jacket are available too.

    The optimal valve type depends on the service and design requirements, shutoff requirements, and the characteristics of the process media.

    When your process can’t afford a shutdown, talk to the steam jacketed valve experts.

    Contact us now!

    (713) 898-8694
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