Specification

High Temperature High Pressure Resistance Manual Valve Stainless Steel Flange Globe Valve

I. Product Overview

NEWWAY high-temperature high-pressure globe valves comply with ASME B16.34 and GB/T 12235 standards, constructed from A105 forged carbon steel and WC6/WC9 cast steel for extreme conditions. The lift-type disc enables precise cutoff and flow regulation, covering DN15-DN300 (1/2″-12″) with Class 150-Class 2500 (PN20-PN420) pressure ratings and -29℃~600℃ temperature range, suitable for steam, hot oil, and syngas in petrochemical, power, and metallurgical industries.

II. Core Technical Parameters

Specifications & Operating Range

Nominal Diameter: DN15/20/25/40/50/80/100/150/200/250/300 (1/2″-12″)

Pressure Class: Class 150/300/600/900/1500/2500 (PN20/PN50/PN100/PN150/PN260/PN420)

Temperature Range: -29℃~425℃ (A105 carbon steel), -29℃~600℃ (WC9 cast steel)

Materials & Sealing System

Body/Bonnet: A105 forged carbon steel (tensile strength ≥485MPa), WC6/WC9 cast steel (high-temperature strength ≥240MPa@550℃)

Disc/Seat: STL6 hard alloy overlay (HRC58-62), sealing surface roughness Ra≤0.2μm

Packing: Flexible graphite braided packing (resists 600℃) + metal wound gasket, leakage rate ≤1×10⁻⁶cc/s (API 598)

Connections: Flanged (RF/RTJ face, ASME B16.5), butt-welded (BW, ASME B16.25)

Actuation & Operation

Actuation: Manual (gearbox standard), electric (explosion-proof actuator), pneumatic (piston cylinder)

Operating Torque: DN100 manual ≤180N·m, electric actuation time ≤15s (Class 600)

Protection Grade: IP67 (body), Ex d IIB T6 (explosion-proof electric)

Product Overview

III. Structural Design & Technical Features

High-Temp/Pressure Seal Optimization

Wedge disc design: 5° taper self-seals via medium pressure, sealing specific pressure ≥30MPa for bidirectional bubble-tight performance.

Double-layer packing: Inner flexible graphite resists high-temperature creep, outer metal ring enhances support to prevent packing failure.

Material Reliability Engineering

Forging/casting process: Forged body eliminates internal defects; cast steel normalized at 950℃ + tempered at 720℃, grain size refined to Grade 5.

Stem enhancement: 25Cr2MoV alloy steel quenched & tempered (HB240-280), STL overlay resists high-temperature oxidation wear.

Hydrodynamic Optimization

Streamlined flow path: Pressure drop reduced by 20% vs. conventional globe valves (DN100 Cv=25), minimizing energy loss under high pressure.

Balanced disc: Reduces on-off resistance, suitable for max pressure differential 15.0MPa (Class 2500).

IV. Manufacturing Processes & Quality Control

Precision Fabrication Flow

Body forging: A105 ingot die-forged under 3000 tons, 100% ultrasonic tested (UT), defect size ≤Φ1mm.

Seal surface treatment: STL alloy plasma-overlaid, aged at 550℃ to eliminate stress, sealing surface flatness ≤0.005mm.

High-Temp Performance Testing

Hydrostatic test: 1.5x shell pressure (e.g., 15.0MPa for Class 600) held for 30min, 1.1x sealing pressure with zero leakage.

Thermal cycle test: 500 cycles between -29℃~600℃, stem displacement deviation ≤0.1mm.

Spectral analysis: C/Cr/Mo element deviation ≤0.03% per heat, traceable to heat number.

NDT System

Body: 100% magnetic particle inspection (MPI) for surface defects.

Welds: 100% radiographic testing (RT), compliant with ASME BPVC Section V.