Double‑Disc Wafer Check Valve | WCB CF8M Class150‑1500 Non‑Return Valve

Body material: WCB cast steel, CF8 / CF8M stainless steel optional
Double‑disc wafer structure, slim flangeless wafer installation
Pressure rating: Class150‑300, conform to ANSI B16.5 standard
Fast‑closing dual‑plate design, effectively reduce water‑hammer impact
Light‑weight and space‑saving, easy installation and maintenance
Low flow resistance, reliable non‑return performance
Suitable for liquid and gas medium, long service life
OEM for size, material and pressure customization supported

Description
Shipping & Delivery

Specification

VALVEFAC 4” Class 300 A105 Dual-Disc Wafer Check Valve with Hard Seal: API/ASME Compliant, High-Pressure Flow Control Solution for Industrial Pipelines

I. Product Overview

TIANYU 4” Class 300 A105 dual-disc wafer check valve is a precision-engineered flow control device designed to prevent reverse flow in industrial pipelines, ensuring operational safety and process integrity. As a dual-disc (double-door) wafer check valve with hard (metal-to-metal) sealing, it combines compact design, low flow resistance, and robust sealing performance—critical for high-pressure applications in oil, gas, chemical, and power industries.

Constructed from A105 carbon steel (ASTM A105), a material renowned for its strength and cost-effectiveness in medium-to-high pressure services, this valve adheres to global standards including API 594, ASME B16.34, and ASME B16.5. Its wafer-style (lugless) flange connection allows for space-efficient installation between pipeline flanges, while the dual-disc design enables rapid, positive closure to prevent water hammer and (media backflow). The hard-seal configuration (metal-to-metal sealing) ensures reliability in high-temperature, high-pressure, and abrasive media environments, making it a staple in process-critical systems where leakage or reverse flow could lead to equipment damage or safety hazards.

II. Key Attribute Specifications

A. Dimensional & Pressure-Temperature Parameters

Port Size: 4” (DN100), a widely adopted size in industrial pipelines that balances flow capacity and installation flexibility. Suitable for medium-scale process lines in refineries, chemical plants, and power generation facilities.
Pressure Rating: Class 300 (PN50), aligned with industrial medium-to-high pressure requirements. The valve undergoes hydrostatic testing at 1.5× rated pressure for the body and 1.1× rated pressure for the seal, ensuring structural integrity and leak-tight performance under operating conditions.
Temperature Range: -29℃ to 425℃, enabled by A105 carbon steel’s thermal stability and compatible hard-sealing materials (e.g., Stellite 6 for sealing faces). This range accommodates ambient media, moderately heated fluids, and high-temperature industrial applications like steam lines.

B. Material Composition

Valve Body & Discs: A105 carbon steel (ASTM A105), a forged carbon steel with tensile strength of 485–655MPa and yield strength ≥240MPa. It offers excellent machinability, weldability, and resistance to moderate corrosion, making it ideal for oil, gas, and chemical services.
Sealing Faces: Hardfaced with Stellite 6 (cobalt-chromium alloy) or equivalent, providing hardness ≥58 HRC, exceptional wear resistance, and chemical inertness to most industrial media.
Hinge Pin: Alloy steel (42CrMo or 17-4PH), precision-machined for strength and corrosion resistance, ensuring the dual discs pivot smoothly during operation.
Gaskets & Fasteners: Spiral-wound gaskets (stainless steel with graphite filler) for body-seal integrity; high-strength alloy steel fasteners (ASTM A193 B7) to maintain clamping force under pressure fluctuations.

C. Connection & Operational Features

Connection Type: Wafer (lugless) flange (ANSI B16.5), allowing direct installation between pipeline flanges. This design eliminates the need for separate valve flanges, saving space and reducing installation costs—ideal for retrofitting into existing systems.
Operation Mode: Automatic (non-actuated), relying on media pressure to open and gravity/spring force to close. The dual-disc design ensures rapid closure (≤1 second for full closure in typical flows), minimizing water hammer and reverse flow risks.
Safety Features: Hard-seal design ensures metal-to-metal sealing even in abrasive or high-temperature media; the dual-disc configuration distributes closing force evenly, reducing wear on sealing faces.

D. Certifications & Compliance

Industry Standards: API 594 (check valves), ASME B16.34 (valve dimensions), ASME B16.5 (pipe flanges), API 598 (valve testing).
Material Certifications: ASTM A105 (valve body), ASTM A193 (fasteners), ISO 9001 (quality management).
Regional Approvals: CE, ATEX (optional for hazardous environments), NACE MR0175 (optional for sour service).