Double Disc Check Valve

The double disc check valve is a critical device in fluid piping systems, designed to prevent medium backflow while minimizing flow resistance through its unique dual-disc linkage structure. Inside the valve body, two symmetric discs are connected via hinges or springs. During forward flow, fluid pressure pushes the discs open, creating an unobstructed passage; when backflow occurs, the discs close simultaneously under the combined action of fluid pressure and gravity, effectively blocking reverse flow.

Core Structural Advantages

Low Flow Resistance Design: When open, the discs align parallel to the fluid flow, forming a near-straight passage. This reduces pressure loss by over 40% compared to traditional check valves, making it ideal for large-diameter applications in water supply and drainage, as well as natural gas transmission.

Rapid Closure Feature: The dual-disc linkage minimizes swing inertia, achieving a closure time of less than 0.5 seconds. This effectively prevents water hammer effects, safeguarding the integrity of the piping system.

Vibration and Noise Reduction: Damping devices and elastic seals on the discs mitigate impact during opening and closing, maintaining noise levels ≤85dB—compliant with urban pipeline silence requirements.

Technical Classification and Materials

Connection Types:

Wafer Type: Installed between two flanges, compact and suitable for pipes with diameters ranging from DN50 to DN600.

Lug Type: The valve body features mounting lugs for easy positioning and fixation, ideal for frequently disassembled applications.

Welded Type: The valve body is directly welded to the pipeline, ensuring high sealing performance, and is suitable for high-pressure systems (PN16-PN100).

Common Material Combinations:

Component	Materials for General Conditions	Materials for Corrosive Conditions
Valve Body	Cast Iron/Carbon Steel	316 Stainless Steel/Duplex Steel
Discs	Ductile Cast Iron	Monel Alloy/Hastelloy Alloy
Sealing Surface	NBR Rubber Share to: Next: Pneumatic Fluorine Lined Control Valve Send Inquiry Ms. Iris Email: cepai@cepai.com Send Inquiry Tel:86-0517-80900000 Fax:86-0517-80909900 Mobile Phone:+86 19551188813 Email:cepai@cepai.com Address:No. 88 Tongtai Avenue, No. 333 Jianshe West Road, Economic Development Zone, Jinhu County, Huaian, Jiangsu Related Products List Control Valves Butterfly Valve Magnetic Flow Meter Gate Valve Ball Valve Globe Valve Mobile Site Home Products About Us News Blog Contact Index Sitemap language Copyright © 2025 CEPAI Group Co., Ltd. All rights reserved. Privacy Policy Home Products Shopcart About Us Inquiry Send Message Privacy statement: Your privacy is very important to Us. Our company promises not to disclose your personal information to any external company with out your explicit permission. Content * Phone * Email * We will contact you immediately Fill in more information so that we can get in touch with you faster Privacy statement: Your privacy is very important to Us. Our company promises not to disclose your personal information to any external company with out your explicit permission. Name Company Name Upload Attachment (Max 5 files. Support jpg, jpeg, png, gif, txt, doc, pdf, xls, docx, xlsx , less than 5MB) Request: Send