Specification

Newway Custom Forged Steel/Stainless Steel Gate Valves: Multi-Application Industrial Flow Control Solutions

I. Product Overview

Newway custom forged steel/stainless steel gate valves feature A105 forged carbon steel, 304/316 stainless steel, and CF8/WCB cast steel materials. With nominal diameters ranging from DN50 to DN400 (2″ to 16″) and pressure classes PN16 to PN100 (1.6MPa to 10.0MPa), these valves operate in -46℃ to 600℃ temperature ranges. The wedge gate design with hydraulic actuation ensures precise on-off control, combining the high strength of forged steel with the corrosion resistance of stainless steel for demanding industrial applications in petrochemical, power, and shipbuilding sectors.

II. Core Technical Parameters

Nominal Diameter: DN50/80/100/150/200/300/400 (customizable up to DN600)

Pressure Class: PN16/PN25/PN40/PN64/PN100 (1.6MPa to 10.0MPa)

Temperature Range: -46℃ to 230℃ (stainless steel), -29℃ to 425℃ (carbon steel), -196℃ to 600℃ (special alloys)

Body/Gate: A105 forged carbon steel (tensile strength ≥485MPa), 304/316 stainless steel (ASTM A351 CF8/CF8M)

Sealing Pair: Metal hard seal (STL alloy overlay) + auxiliary PTFE soft seal, leakage rate ≤0.1% (API 598)

Stem: 2Cr13 stainless steel (HRC30-35 hardness), chrome-plated surface

Connections: Flanged (ASME B16.5/GB/T 9113), butt-welded (BW), threaded (NPT)

Actuation: Hydraulic drive (standard), optional pneumatic/electric/manual

Operation Time: ≤5 seconds (DN100 hydraulic drive)

Protection Grade: IP67 (body), Ex d IIB T4 (explosion-proof electric actuator)

III. Structural Design & Technical Features

Integrally forged body eliminates casting defects, with grain flow following structural contours, enhancing fatigue resistance by 30%.

Double-eccentric wedge gate design auto-compensates sealing specific pressure (≥15MPa) via medium pressure for bidirectional bubble-tight sealing.

Low-temperature: LCB forged carbon steel (-46℃) with extended bonnet to prevent cold transfer.

High-temperature: A105 material tempered at 650℃, maintaining creep strength ≥180MPa at 425℃.

Servo hydraulic system provides constant driving force, overcoming on-off resistance under high pressure differential.

Integrated accumulator design supports emergency shut-off (ESD function) during power outages.

Product Overview

IV. Manufacturing Processes & Quality Control

Precision Forging Flow

Free forging/die forging process, blank dimension tolerance ≤±0.5mm, ultrasonically tested (UT) for internal defects.

Stainless steel parts solution treated at 1050℃, grain size ≥Grade 5 for excellent intergranular corrosion resistance.

Surface Treatment Technology

Carbon steel body with three-layer anti-corrosion system:

Zinc-based epoxy primer (80μm) + fiberglass intermediate layer + weather-resistant polyurethane topcoat (100μm)

Stainless steel electrolytic polishing (Ra≤0.8μm), passivated for salt spray test ≥1000 hours.

3D Quality Inspection

Hydrostatic test: 1.5x working pressure for shell (30min hold), 1.1x for sealing (zero leakage).

Spectral analysis: Element deviation ≤0.05% per heat, traceable to heat number.

SIL certification test: Meets Safety Integrity Level SIL 2/3 requirements.