300LB Stainless Steel ASME Flanged API603 Gate Valve

Product Overview

The 300LB Stainless Steel ASME Flanged API603 Gate Valve is a high-reliability shutoff valve engineered for medium-pressure (300LB/PN50) industrial systems, fully complying with API 603 standards for corrosion-resistant bolted bonnet gate valves and ASME B16.34/B16.5/B16.10 specifications. Constructed from premium stainless steel (CF3/CF8M/316L optional) — selected for superior corrosion resistance, high-temperature tolerance, and structural integrity — this valve features an outside screw and yoke (OS&Y) rising stem design, full-port flow channel, and ASME B16.5 flanged connections. Operating reliably in temperatures ranging from -196℃ to 450℃ (-320°F to 842°F), it delivers minimal flow resistance, tight shutoff (API 598 Class IV), and long-term durability in corrosive, high-purity, or general industrial media. Widely trusted in chemical processing, petrochemical, pharmaceutical, and water treatment industries, it balances global standard compliance, operational efficiency, and easy maintenance for critical piping systems.

Key Features & Advantages

1.Premium Stainless Steel Construction

Available in multiple stainless steel grades to match diverse application needs:

◦CF3 (ASTM A351): Ultra-low carbon (≤0.03%), cast 304L equivalent — excellent intergranular corrosion resistance, ideal for welded systems.

◦CF8M (ASTM A351): Cast 316L equivalent, 含 2-3% molybdenum — superior chloride pitting resistance (seawater, brine compatible).

◦316L (ASTM A479): Wrought stainless steel — high purity, corrosion resistance for harsh chemicals.

All grades offer tensile strength ≥485 MPa, yield strength ≥205 MPa, and excellent toughness in cryogenic to high-temperature environments.

1.API 603 & ASME Standard Compliance

Fully adheres to API 603 (corrosion-resistant bolted bonnet gate valves) — including OS&Y rising stem, full-port design, and minimum wall thickness requirements. Complies with ASME B16.34 (pressure-temperature ratings), ASME B16.5 (flanged connections), and ASME B16.10 (structure length) for global interchangeability. Meets API 598 test standards for leak-free performance (Class IV) and fugitive emissions control (≤50 ppm), ensuring compliance with industrial safety regulations.

2.300LB (PN50) Medium-Pressure Rating

Rated for working pressures up to 5.0 MPa (725 psi) at ambient temperatures, with pressure-temperature ratings aligned to ASME B16.34. At 300℃ (572°F), the valve retains a working pressure of 3.9 MPa (566 psi), stable for medium-pressure systems such as chemical process lines, high-purity water pipelines, and power plant auxiliary systems. The reinforced stainless steel body handles pressure cycling without deformation or leakage.

3.ASME B16.5 Flanged Connections

Equipped with ASME B16.5 flanged ends (RF/RTJ face options) for secure, leak-proof installation. Compatible with standard industrial flanges across sizes 1/2"–24" (DN15–DN600), facilitating easy assembly, disassembly, and maintenance. The flanged design is ideal for applications requiring frequent inspection or system modifications, ensuring reliable sealing in cyclic pressure conditions.

4.OS&Y Rising Stem & Full-Port Design

Outside screw and yoke (OS&Y) structure keeps stem threads protected from media corrosion (thread not in contact with fluid), extending service life. The rising stem provides visual confirmation of valve position (open/closed) — critical for safety-critical systems. Full-port flow channel minimizes pressure drop (Cv value optimized) when fully open, reducing energy consumption for high-flow applications (e.g., cooling water, bulk chemical transfer).

5.Reliable Shutoff & Low Maintenance

Rigid wedge disc with precision-machined seating surfaces (optional Stellite 6 overlay for wear resistance) ensures tight metal-to-metal sealing (API 598 Class IV). Bolted bonnet with backseat design allows in-line maintenance — inspect, repair, or replace internal components (stem, disc, seat) without removing the valve from the pipeline. One-piece forged stainless steel stem ensures structural integrity and corrosion resistance.

6.Wide Operating Temperature Range

Suitable for extreme temperatures from -196℃ (-320°F) to 450℃ (842°F), adapting to cryogenic services (liquid nitrogen, LNG) and high-temperature industrial processes (steam, hot chemicals). The austenitic structure of stainless steel maintains toughness and corrosion resistance across the entire temperature range.

Technical Specifications

Applications

The 300LB Stainless Steel ASME Flanged API603 Gate Valve is ideally suited for:

•Chemical & petrochemical processing (organic acids, alkalis, solvents, chloride-containing media)

•Pharmaceutical & biotechnology (sterile process lines, clean-in-place (CIP) systems, high-purity fluids)

•Food & beverage industry (breweries, dairies, bottling plants — non-reactive, sanitary requirements)

•Water treatment (desalination, deionized water, corrosive wastewater systems)

•Cryogenic services (liquid nitrogen, LNG, low-temperature fluid handling)

•Power generation (auxiliary systems, boiler feedwater lines, high-purity steam)

•Marine and offshore utilities (seawater systems, ballast lines, offshore platforms)

Why Choose Our 300LB ASME API603 Gate Valve?

✅ Global Standard Compliance: API 603 + ASME certifications ensure interchangeability and reliability in international projects.

✅ Superior Corrosion Resistance: Multiple stainless steel grades adapt to corrosive, high-purity, or chloride-containing media.

✅ Low Flow Resistance: Full-port design optimizes energy efficiency for high-flow applications.

✅ Durable OS&Y Design: Protected stem threads and rising stem position indication extend service life and enhance safety.

✅ Easy Installation & Maintenance: ASME B16.5 flanges and bolted bonnet enable quick assembly and in-line service.

✅ Wide Temperature Adaptability: Operates from cryogenic -196℃ to 450℃, fitting diverse industrial environments.

Order Information

•Minimum Order Quantity (MOQ): 1 Unit

•Lead Time: 10-25 Working Days (Standard Sizes); Customized Orders: 25-40 Working Days

•Payment Terms: T/T (30% Advance + 70% Against B/L Copy), L/C, Western Union

•Shipping: Sea Freight (FCL/LCL), Air Freight, Express (DHL/FedEx/UPS)

•Packaging: Anti-corrosion Coating + Wooden Case + Custom Labeling (Meets Export Standards)

•After-Sales Service: 12-Month Warranty, Technical Support, Spare Parts Supply

•Certifications Provided: Material Mill Test Certificate (EN 10204 3.1), API 598 Test Report, ISO 9001 Certificate, FDA/NACE Certificates (Optional)

Contact our technical sales team for personalized quotes, 2D/3D drawings, material certificates, or sample requests. We provide tailored stainless steel valve solutions to meet your specific application needs.

What Is a 300LB Stainless Steel ASME Flanged API603 Gate Valve

A 300LB Stainless Steel ASME Flanged API603 Gate Valve is a corrosion resistant isolation valve designed for full open or full closed service in industrial pipelines. It is manufactured from stainless steel to provide excellent resistance to rust, oxidation, and chemical attack. The wedge gate moves vertically to block or clear the flow path with minimal pressure loss. ASME flanged ends ensure secure installation, while API603 standards define compact stainless steel valve construction and material requirements.

Why the 300LB Stainless Steel ASME Flanged API603 Gate Valve Matters

This valve is important because it combines reliable shutoff with strong corrosion resistance in compact and lightweight designs. Stainless steel construction performs well in aggressive media and high purity applications. The full port structure preserves flow efficiency when the valve is open. API603 compliance ensures consistent dimensions and material quality, while ASME flanges provide dependable sealing and easy maintenance in critical processing systems.

Common Product Types by 300LB Stainless Steel ASME Flanged API603 Gate Valve

Common product types include outside screw and yoke gate valves, bolted bonnet gate valves, and flexible wedge gate valves. Solid wedge designs are suitable for general service, while flexible wedges improve seat contact during temperature changes. Optional configurations include extended stems, locking devices, and special trim materials. Various stainless steel grades and seat facings are available to match corrosive, sanitary, or high temperature applications.

Key Advantages of 300LB Stainless Steel ASME Flanged API603 Gate Valve

The valve offers excellent corrosion resistance, dependable bidirectional sealing, and low pressure drop when fully open. Stainless steel construction provides long service life and clean operation. ASME flanged ends simplify installation and replacement. The robust wedge and seat design withstand repeated cycling, while API603 construction delivers compact dimensions, reduced weight, and reliable performance in demanding industrial environments.

300LB Stainless Steel ASME Flanged API603 Gate Valve Machine Structure and Core Stations

Manufacturing begins with precision casting of the body, bonnet, wedge, and stem components in stainless steel. Core stations include solution treatment, CNC machining of flange faces, guide slots, stem threads, and sealing surfaces. Assembly stations install the wedge, stem, packing, bonnet, and handwheel. Final operations include seat lapping, pressure testing, cleaning, passivation, marking, and packaging to ensure dimensional accuracy, corrosion resistance, and leak tight performance.