API 600 Class 150 WCB Cast Steel ANSI Flanged Swing Check Valve

Product Overview

The API 600 Class 150 WCB Cast Steel ANSI Flanged Swing Check Valve is a professional pipeline one-way protection valve manufactured in strict accordance with API 600 and ASME B16 series American industrial standards. Adopting premium ASTM A216 WCB cast steel body and classic swing disc structure, this Class 150 low-pressure swing check valve is designed to prevent medium backflow in industrial pipelines, realizing automatic one-way flow control without manual operation.

Different from lift check valves, the swing check valve adopts a free-swing disc design with large flow area and low flow resistance. The flexible swing disc opens with medium flow and closes automatically by medium back pressure and gravity, effectively protecting pipeline equipment from reverse flow impact and medium backflow pollution. With standard ANSI flanged connection, thickened cast steel wall and stable sealing performance, this API 600 check valve features simple structure, strong impact resistance and long service life, widely used in various industrial medium transmission pipelines for one-way safety protection.

Key Features & Advantages

1.Standard API 600 & ANSI Compliance

Designed and tested fully in line with API 600 steel valve specifications, matched with ASME B16.34 pressure-temperature rating, ASME B16.10 face-to-face dimension and ASME B16.5 flange standards. All technical parameters meet international industrial acceptance standards, fully compatible with global ANSI standard pipeline systems and suitable for overseas engineering supporting and bidding projects.

2.Premium WCB Cast Steel Body

Adopts ASTM A216 WCB high-quality cast carbon steel, the mainstream material for industrial pipeline valves. It features excellent high-temperature stability, strong medium scouring resistance and structural toughness, with no casting defects such as pores and sand holes. The integral cast structure ensures stable mechanical performance during long-term cyclic pipeline operation.

3.Reliable Swing Disc Non-Return Structure

Classic rotary swing disc design with large flow passage and minimal flow resistance. The valve disc swings flexibly with medium flow, realizing automatic opening and closing without manual or electric drive. It effectively prevents medium backflow, avoids pipeline pressure reversal and equipment damage, providing stable one-way protection for pipeline systems.

4.Standard ANSI Flanged Connection

Equipped with ANSI B16.5 standard raised face (RF) flange with unified international installation dimensions and high-precision sealing surface. The flanged structure enables quick positioning and installation, convenient daily disassembly, inspection and maintenance, with good vibration resistance and sealing stability for long-term pipeline operation.

5.Low Resistance & High Efficiency Operation

The optimized internal flow channel and swing disc structure reduce pipeline flow resistance greatly, lowering medium transmission energy consumption. Compared with other check valve types, it has larger flow capacity and less pressure loss, improving overall pipeline transmission efficiency.

6.Durable Sealing & Zero Backflow

The valve disc and seat adopt precision fitting structure, with optional Stellite hard alloy overlay for enhanced wear and high-temperature resistance. All products pass strict API 598 hydrostatic and sealing tests to ensure tight shutoff and complete zero backflow, guaranteeing pipeline system safety.

Technical Specifications

Applications

•Oil & Gas Industry: Oilfield gathering and transportation pipelines, low-pressure gas transmission pipelines, station pipeline anti-backflow protection systems

•Petrochemical & Refinery: Refinery process pipelines, light oil delivery systems, chemical medium one-way conveying pipelines

•Power Generation: Thermal power plant auxiliary steam pipelines, boiler water supply systems, circulating water anti-backflow equipment

•Industrial Manufacturing: Factory process fluid pipelines, compressed air systems, industrial water delivery protection pipelines

•General Municipal Engineering: Municipal water supply and gas supply pipelines, public engineering pipeline one-way safety control systems

Why Choose Our API 600 Class 150 Swing Check Valve?

✅ Genuine API 600 Standard — Fully compliant with API 600 and ANSI international standards, compatible with global standard pipeline systems, meeting overseas engineering acceptance requirements.

✅ High-Quality WCB Cast Steel — Integral cast steel body with stable structure, excellent high-temperature and pressure resistance, durable for long-term industrial pipeline operation.

✅ Automatic Swing Disc Design — Gravity and flow driven automatic operation, no extra power required, low failure rate and stable one-way anti-backflow performance.

✅ Low Flow Resistance — Large-caliber smooth flow channel, minimal pressure loss, effectively improving pipeline transmission efficiency and saving operating energy consumption.

✅ Easy Installation & Maintenance — Standard ANSI flange design for quick assembly and disassembly, simple internal structure, low later maintenance cost and high cost performance.

Order & Certification Information

MOQ: 1 Unit

Lead Time: 12-25 working days for standard sizes

Certificates: EN10204 3.1 Material Certificate, API 598 Test Report, ISO 9001 Quality Certificate

Packing: Anti-rust treatment + Standard export wooden case

Warranty: 18-month quality warranty and lifelong technical support

Contact Us for customized sizes, trim materials and bulk quotation of API 600 Class 150 WCB flanged swing check valves.

What Is an API 6D Check Valve

An API 6D Check Valve is an automatic non return valve designed to prevent reverse flow in pipeline systems carrying liquids, gases, and other process media. Built in accordance with API requirements, the valve provides dependable sealing and structural integrity for demanding industrial applications. It operates automatically by allowing forward flow and closing when the flow direction changes. These valves are widely used in oil and gas transmission, petrochemical facilities, power generation, and other critical process systems.

Why the API 6D Check Valve Matters

This valve is important because it protects pumps, compressors, and pipeline equipment from damage caused by backflow and pressure fluctuations. API compliant construction helps ensure reliable performance and consistent quality under severe operating conditions. Automatic operation eliminates the need for external power or manual control. By maintaining one way flow, the valve contributes to process safety, equipment protection, and the stable operation of industrial systems.

Common Product Types by API 6D Check Valve

Common product types include swing check valves, piston check valves, lift check valves, and dual plate check valves. Tilting disc and non slam designs are also available for applications requiring reduced water hammer effects. Full bore configurations are often selected for efficient flow performance. Various body materials, seat designs, and trim options can be provided to suit corrosive media, elevated temperatures, and high pressure environments.

Key Advantages of API 6D Check Valve

The valve offers reliable backflow prevention, automatic operation, and low maintenance requirements. API standard construction enhances durability and sealing performance in demanding services. Properly designed internal components help minimize pressure loss and maintain efficient flow characteristics. The robust structure provides long service life and dependable operation, making the valve suitable for critical pipeline applications where safety and reliability are essential.

API 6D Check Valve Machine Structure and Core Stations

Manufacturing begins with casting or forging the body, bonnet, disc, and hinge components from selected materials. Core stations include heat treatment and precision CNC machining of sealing surfaces, flow passages, hinge areas, and connection ends. Assembly stations install the disc, seat components, hinge mechanism, and sealing elements. Final operations include seat lapping, pressure testing, surface treatment, cleaning, marking, and packaging to ensure dimensional accuracy and reliable sealing performance.