Specification

ASTM API Manual GATE Valve 304 Stainless Steel Forging 2in Flange Type 150Lb Forged Steel Gate Valve

I. Product Overview

As a critical shut-off and regulation device in industrial pipeline systems, NEWWAY forged steel and stainless steel wedge gate valves are constructed from high-strength A105 forged carbon steel and 304/316 stainless steel, combined with a wedge-type single gate structure. Specifically engineered for high-pressure, high-temperature, and corrosive environments in petroleum, chemical, power, and metallurgy industries, these valves enable precise on-off control via manual, electric, or pneumatic actuation. Suitable for temperature ranges from -29°C to 425°C and pressure classes from PN16 to PN160 (Class 150 to Class 900), with nominal diameters from DN15 to DN600, they are compatible with various media such as oil-gas, steam, and acid-base solutions, complying with international standards like API 600 and ASME B16.34.

II. Core Features: Dual Technical Breakthroughs in Material and Structure

High-Performance Material Combination

A105 Forged Carbon Steel: Subjected to 1100°C high-temperature forging and normalizing-tempering treatment, achieving tensile strength ≥485MPa, grain size up to Grade 6, and impact toughness 30% higher than cast steel components. Ideal for high-temperature and high-pressure steam pipelines (e.g., main steam systems in thermal power plants).

304/316 Stainless Steel: Using AISI 304 (0Cr18Ni9) or 316 (0Cr17Ni12Mo2) materials, passing intergranular corrosion tests (ASTM A262 E method). The 316 grade resists corrosion from seawater with chloride content ≤200ppm and molybdenum-containing media, suitable for offshore platforms and chemical pickling lines.

Wedge-Type Sealing System Design

Metal Hard Seal: The gate and seat sealing surfaces are overlay welded with Stellite alloy, hardness ≥HRC55, and precision ground to surface roughness Ra≤0.8μm, meeting API 598 bubble-tight standards (leakage ≤0.01×DN mm³/s).

Back-Seal Structure: The stem uses trapezoidal threads with flexible graphite packing. When the valve is fully open, medium pressure assists in enhancing sealing to prevent external leakage, ensuring operational safety (complying with ISO 15848-1 low-leakage standards).

Structural Optimization and Operational Performance

Outside Stem and Yoke (OS&Y): Visually indicates the opening/closing status via stem extension. Combined with a copper alloy nut and molybdenum disulfide grease, it reduces opening/closing torque by 25%, with manual operation force ≤200N·m (DN100 specification).

Pressure Self-Tightening Bonnet: In high-pressure conditions (e.g., above PN100), medium pressure pushes the bonnet to automatically compress the sealing gasket, avoiding leakage risks from bolt fatigue and enhancing system reliability.

Full Working Condition Adaptability

Temperature Range: From -29°C low-temperature liquefied natural gas (LNG) pipelines (A105 material passes -46°C low-temperature impact test with impact energy ≥27J) to 425°C high-temperature thermal oil systems (stainless steel maintains oxidation resistance for ≥1000 hours).

Pressure Class: From PN16 low-pressure steam pipelines to PN160 high-pressure hydrogenation units, customizable forged steel or stainless steel material combinations balance strength and corrosion resistance.

III. Key Attributes: Technical Parameters and Standard Compliance