High-Temperature Y-Pattern Globe Valve

The High-Temperature Y-Pattern Globe Valve features an inclined seat architecture engineered to maintain smooth, straight-through fluid movement while minimizing turbulence and fluid friction. Built to API 602, BS 1873, and ASME B16.34 standards, this inline severe-service valve delivers precise flow control and bubble-tight shut-off in superheated steam, thermal oil, and high-pressure power utility lines operating up to 650°C.

Inclined Flow Channel: 45-degree stem angle simplifies internal path configuration, achieving higher Cv values and decreasing overall pressure loss across the line.

Cobalt Alloy Hardfacing: Precision-welded Stellite 6 surfaces on seat rings and disc face protect against severe particulate erosion and surface galling under differential pressure.

Pressure-Seal Housing Option: Internally energized bonnet sealing utilizes system pressure to maintain seal compression under continuous thermal cycling.

Emissions Containment: Extended stuffing box packed with die-formed graphite rings and anti-extrusion barriers complies with ISO 15848-1 leak rate specifications.

Precision-Guided Trim: Parabolic disc design guided throughout its full travel span eliminates stem vibration and seat imbalance during throttling.

Body Configuration: Y-Pattern, forged or cast construction with heavy wall sections designed per ASME B16.34.

Bonnet Jointing: Bolted Bonnet with enclosed spiral wound gasket for lower pressure classes; Pressure Seal Bonnet for elevated pressure conditions.

Trim Mechanism: Plug-type throttling disc attached via articulated stem joint to prevent disc-to-seat misalignments.

Stem Assembly: Outside Screw and Yoke (OS&Y) with precision ACME trapezoidal threads and burnished stem packing contact surfaces.

Integrated Backseat: Machined integral backseat structure enables packing isolation under pressure.
 

Manual handwheel or automatic actuator rotation transfers linear force along the 45-degree inclined stem axis. The parabolic plug moves directly into the angled seat orifice. The straight-line flow passage reduces the directional turn of entering media, preserving fluid energy, lowering velocity-induced wear, and providing stable flow regulation.

Flanged Ends: ASME B16.5 Raised Face (RF) for low-to-medium thermal loops; Ring Type Joint (RTJ) for elevated temperature and pressure service.

Welded Ends: ASME B16.25 Butt-Weld ends configured to matching pipe schedule; ASME B16.11 Socket-Weld ends for small bore dimensions.

Bonnet Connections:
• Bolted Bonnet: Heavy stud bolting with defined torque parameters and metal-to-metal gasket stop.
• Pressure Seal Bonnet: Internal self-energizing metallic or graphite seal ring held by segmented thrust ring.

Manual Control: Handwheel with internal thrust bearing assembly; bevel gear operator for high operating torques on larger sizes.

Electric Actuator: Multi-turn electric drive unit complete with integrated limit switches, torque monitoring, and digital control protocols.

Pneumatic Actuator: Double-acting or spring-return linear diaphragm and piston configurations fitted with electro-pneumatic positioners.

Hydraulic Control: Electro-hydraulic power unit configured for automated remote modulating service.

Hydrostatic & Air Testing: 100% factory hydrostatic shell testing at 1.5 times nominal pressure rating and high-pressure seat closure testing per API 598.

Volumetric NDT: Radiographic testing and ultrasonic examination on pressure-retaining forged and cast pressure boundaries per ASME Section V.

Surface NDT: Liquid penetrant and magnetic particle inspection applied to seat weld overlays, body ends, and inner radii.

Chemical Verification: Positive Material Identification (PMI) conducted on all alloy pressure-containing parts prior to assembly.

Superheated Steam Lines: Manages high-temperature steam distribution with minimal pressure drop across boiler loops.

Boiler Feedwater Isolation: Maintains tight seal performance during high differential pressure boiler feed operations.

Thermal Fluid Circulation: Prevents fugitive fluid loss in high-temperature organic heat carrier loops.

Chemical Hydroprocessing: Controls hydrogen and hydrocarbon flows under extreme heat and pressure parameters.

High-Pressure Blowdown Lines: Resists fluid erosion during periodic steam discharge operations.

Define Process Metrics: Determine design temperature, design pressure, fluid medium, and maximum allowable differential pressure drop across the seat.

Calculate Flow Value (Cv): Verify required flow coefficient against line size to optimize bore dimensions and velocity profiles.

Select Metallurgy:
• Up to 425°C: Carbon Steel (A105 / WCB).
• Up to 593°C: Alloy Steel (F22 / WC9).
• Above 593°C: High-Chrome Alloy (F91 / C12A) or Stainless Steel (F316).

Choose Bonnet Seal Type: Specify Bolted Bonnet for Class $\le 600$; specify Pressure Seal Bonnet for Class $\ge 900$ to maintain sealing stability under severe temperature fluctuations.

Verify Hardfacing: Select full Stellite 6 overlay on both disc and seat faces for continuous high-temperature throttling service.

Material Certification: Mill Test Reports according to EN 10204 Type 3.1 supplied standard; Type 3.2 available upon request via independent inspection bodies.

Non-Destructive Testing Reports: Complete inspection packages including RT, UT, PT, MT, and PMI records.

Factory Acceptance Reports: Dimensional inspection certificates, hydrostatic test charts, wall thickness readouts, and surface coating verification.

Drawing & Manual Package: General Arrangement (GA) dimensional drawings, parts cross-section diagrams with material callouts, and Installation, Operation & Maintenance (IOM) guidelines.

Custom Face-to-Face Lengths: Specialized body dimensions manufactured to match legacy pipeline layouts without piping modifications.

Specialized Trim Overlays: Tungsten carbide, Stellite 21, or Inconel hardfacing options tailored for distinct fluid erosiveness.

Extended Bonnet Design: Heat dissipation bonnet extensions constructed for high-temperature insulated piping runs.

Custom End Prep: Specialized bevel angles, counterbore dimensions, flange face finishes, and body drain ports.