Industrial Globe Valve: Engineering Specifications and Procurement Guide
Valtone industrial globe valves are engineered for precise flow throttling and reliable shut-off in high-pressure piping systems. Built with an outside screw and yoke (OS&Y) rising stem design, these valves isolate line media from the stem threads to prevent corrosion and galling. Configured for severe service demands, our forged and cast bodies comply with ASME B16.34 and API standards, delivering tight shut-off and minimal pressure drop across hydrocarbon processing, power generation, and industrial steam networks.
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Plug-type disc design allows linear flow modulation and precise throttling control.
OS&Y construction keeps stem threads external to the process fluid, eliminating thread fouling.
Stellite (Co-Cr-A) hardfaced seat rings resist cavitation, erosion, and high-velocity wire-drawing.
Flexible wedge/solid disc configurations match thermal expansion demands in high-temperature lines.
Live-loaded packing options available for low fugitive emission compliance (ISO 15848).
Technical Specifications
|
Parameter |
Specification |
|
Size Range |
NPS 1/2–24 (DN 15–DN 600) |
|
Pressure Class |
ASME Class 150–2500; PN 20–PN 420 |
|
Design Standards |
API 602, BS 1873, ASME B16.34 |
|
End Connections |
Flanged (RF/RTJ) per ASME B16.5 / B16.47; Butt-Weld per ASME B16.25; Threaded (NPT) per ASME B1.20.1 |
|
Operation |
Handwheel, Gearbox, Pneumatic Actuator, Electric Actuator |
|
Testing Standards |
API 598, API 6D, ISO 5208 |
Design & Construction
Body & Bonnet:
Bolted bonnet with spiral-wound stainless steel/graphite gasket for standard services; pressure seal bonnet for high-pressure (Class 900+) applications.
Stem:
Precision-machined integral back-seat stem with rolled threads for enhanced tensile strength and smooth torque operation.
Disc:
Guided plug disc with tapered seating surfaces ensures stable positioning under high differential pressure drops.
Packing:
Die-formed flexible graphite rings with braided carbon wiper rings to prevent media migration.
Materials
Carbon Steel:
ASTM A216 WCB, WCC; Forged ASTM A105N
01
Alloy Steel:
ASTM A217 WC6, WC9; Forged ASTM A182 F11, F22
02
Stainless Steel:
ASTM A351 CF8M, CF3M; Forged ASTM A182 F304, F316
03
Special Alloys:
Duplex Stainless Steel (UNS S31803 / S32750), Monel, Inconel
04
Trim Materials:
13Cr (Type 410), Stellite Hardfaced (Trim 5, Trim 8), Monel Trim
05
Operation relies on linear stem travel moving a plug-type disc perpendicular to the seat ring.
Rotating the handwheel lowers or raises the stem, decreasing or increasing the annular flow area between the plug and the seat. This linear displacement permits accurate flow regulation. The fluid changes direction inside the body, creating higher flow resistance compared to gate valves, which makes it ideal for intentional pressure reduction and throttling duties.
Performance / Selection Considerations
Flow Direction:
Install strictly according to the flow arrow cast on the body (typically under-seat entry) to ensure proper disc seating and prevent water hammer.
Cv Values:
Calculate required flow coefficients to avoid oversized selection, which accelerates seat erosion at low opening percentages.
Cavitation Risk:
Evaluate pressure drop ratios (delta P / P1) for liquid applications to prevent flashing and downstream pipe damage.
Main steam isolation and auxiliary steam drains in thermal power plants.
Boiler feedwater lines and high-pressure condensate systems.
Hydrocarbon processing units (crude distillation, catalytic cracking, hydrotreating).
High-pressure chemical dosing and reactor feed lines.
Manufacturing & Quality Control
Forging & Casting:
Raw material sourced from certified foundries with complete chemical and mechanical mill test reports (EN 10204 3.1).
Machining:
CNC vertical boring mills and multi-axis machining centers maintain tight dimensional tolerances on seat angles and stem guides.
Non-Destructive Testing (NDT):
100% radiographic examination (RT) for pressure-containing castings and ultrasonic testing (UT) for forged bars per ASME Section V.
Pressure Testing:
Every valve undergoes shell hydrostatic test (1.5 x rating), seat pneumatic/hydrostatic test, and backseat testing per API 598.
OEM / Customization
• Custom face-to-face dimensions to match existing piping layouts during plant retrofits.
• Special end-connection combinations (e.g., socket weld inlet with flanged outlet).
• Cryogenic extension bonnets for low-temperature LNG applications down to -196 deg C.
• Integration of limit switches, locking devices, and ISO 5211 direct-mounting actuator pads.
Our Certificate
Why Choose Valtone
Traceable material pedigree backed by full melt-shop certification and PMI (Positive Material Identification) reports.
Precision seat lapping processes achieving bubble-tight shut-off exceeding API 598 leakage rates.
Dedicated engineering support providing torque calculations, flow sizing reports, and 3D CAD models.
FAQ
As one of the most professional globe valve manufacturers and suppliers in China, we have world-leading production equipment and strong manufacturing capabilities. Please rest assured to buy bulk durable globe valve for sale here from our factory. We also accept customized orders.
