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Home > Industrial Equipment & Components > Valve > Butterfly Valve > CB/T4303 Butterfly Check Valve DN50 PN1.0MPa With Flanged Connection and Mill Test Report

CB/T4303 Butterfly Check Valve DN50 PN1.0MPa With Flanged Connection and Mill Test Report

CB/T4303 Butterfly Check Valve DN50 PN1.0MPa With Flanged Connection and Mill Test Report thumbnail-3

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CB/T4303 Butterfly Check Valve DN50 PN1.0MPa With Flanged Connection and Mill Test Report thumbnail-5

CB/T4303 Butterfly Check Valve DN50 PN1.0MPa With Flanged Connection and Mill Test Report photo-1

CB/T4303 Butterfly Check Valve DN50 PN1.0MPa With Flanged Connection and Mill Test Report photo-2

CB/T4303 Butterfly Check Valve DN50 PN1.0MPa With Flanged Connection and Mill Test Report photo-3

CB/T4303 Butterfly Check Valve DN50 PN1.0MPa With Flanged Connection and Mill Test Report photo-4

CB/T4303 Butterfly Check Valve DN50 PN1.0MPa With Flanged Connection and Mill Test Report photo-5

Product Spotlights

CB/T4303 standard butterfly check valve for reliable one-way flow control. Features DN50 size, PN1.0MPa pressure rating, and space-saving flanged connection. Constructed with durable materials like ductile iron and stainless steel, it ensures low pressure drop and quick closure to prevent backflow and water hammer. Each valve comes with a Mill Test Report for quality assurance. Ideal for protecting pumps and systems in water, HVAC, and industrial applications.

Negotiable MOQ: 1 Unit (Price negotiable depending on order volume and customization)

Key Specifications

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Product Standard:

CB/T4303

Valve Type:

Butterfly Check Valve (Non-Return Valve)

Nominal Diameter (DN):

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Shanghai Zhibang Valve Manufacture Co.,ltd

1Yr

Payment & Shipping

Payment Methods:

Port of Shipment:

China

Delivery Detail:

Delivery time depends on order quantity.

Product Details
Company Profile
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Product Standard CB/T4303

Valve Type Butterfly Check Valve (Non-Return Valve)

Nominal Diameter (DN) 50

Pressure Rating (PN) 1.0 MPa

Connection Type Flanged (Wafer/Lug type optional)

Body Material Ductile Iron/Cast Iron/Cast Steel

Disc Material Stainless Steel/Ductile Iron

Seat Material EPDM/NBR/Viton

Operation Automatic (Flow actuated)

Testing Documentation Mill Test Report (MTR) provided

As a professional valve manufacturer with ISO9001 certified quality management, Shanghai Zhibang Valve is proud to introduce our high-performance CB/T4303 standard Butterfly Check Valve, DN50 PN1.0MPa, designed for reliable and efficient one-way flow control. This valve is engineered to prevent reverse flow and protect critical system components like pumps and compressors in a compact, flanged package. We combine rigorous manufacturing standards with comprehensive testing, ensuring each valve delivers consistent performance and longevity for your demanding industrial applications across global markets from North America to Southeast Asia.

Core Product Features & Technical Advantages:

Superior Flow Efficiency & Low Pressure Drop: The butterfly-style disc design offers minimal flow resistance compared to traditional swing or lift check valves. The streamlined disc pivots on a central shaft, opening fully with forward flow and closing swiftly upon flow cessation or reversal. This results in higher system efficiency and reduced energy consumption for pumping systems.
Robust Construction & Material Selection: Manufactured in compliance with the CB/T4303 standard, the valve body is typically constructed from high-grade ductile iron, cast iron, or cast steel, providing excellent strength and corrosion resistance. The disc is often made from stainless steel or coated ductile iron for durability. A variety of elastomer seat materials like EPDM, NBR, or Viton are available to suit different media temperatures and chemical compatibilities.
Compact & Space-Saving Design: The wafer or lug-style flanged connection design makes this butterfly check valve significantly more compact and lighter than equivalent pipe-sized swing check valves. This allows for easier installation in tight spaces, reduces structural support requirements, and lowers overall system weight and cost.
Quick Response & Reliable Sealing: The disc is designed for rapid closure to prevent water hammer and system shock. The sealing mechanism ensures tight shut-off against reverse flow, protecting upstream equipment. The closing speed can be influenced by disc weight and spring assistance (if applicable, based on specific model), which is crucial for pump protection.
Versatile Flanged Connection: The DN50 PN1.0MPa rating indicates a 50mm nominal diameter suitable for 1.0 MPa (approx. 10 bar) working pressure. The flanged ends are machined to standard dimensions (e.g., EN, ANSI, JIS, GB), ensuring easy integration into existing piping systems without special adapters.
Comprehensive Quality Assurance: Every valve undergoes stringent factory testing, including shell test, seat test, and operational checks. A detailed Mill Test Report (MTR) is provided with each valve, documenting material chemical and physical properties, heat treatment data, and pressure test results, offering full traceability and quality confidence.

Detailed Specifications & Configuration Options:

Parameter	Specification / Option
Product Standard	CB/T4303 (China Standard for Butterfly Check Valves)
Nominal Diameter (DN)	50 (Other sizes from DN40 to DN600 are available)
Pressure Rating (PN)	1.0 MPa (PN10). PN16, PN25 ratings are optional.
Connection Type	Flanged (Wafer type standard, Lug type optional)
Flange Standard	GB, EN, ANSI, JIS, etc. (Specify upon inquiry)
Body Material	Ductile Iron (QT450-10), Cast Iron (HT250), Cast Steel (WCB)
Disc Material	Stainless Steel (304, 316), Ductile Iron with Ni-plate or epoxy coat
Shaft Material	Stainless Steel (2Cr13, 304, 316)
Seat Material	EPDM (for water, -20~120°C), NBR (for oil, -20~80°C), Viton (FKM, for chemicals, -20~180°C)
Operating Temperature	Depends on seat material (Typically -20°C to +120°C for EPDM)
Applicable Media	Water, Oil, Gas, Steam, Weak Corrosive Fluids
Testing & Documentation	Shell Test, Seat Test, MTR (Mill Test Report) provided

Benefits for Your Operations:

Enhanced System Protection: Prevents costly damage to pumps, meters, and other equipment from reverse flow and water hammer.
Reduced Maintenance & Downtime: Simple, robust design with few moving parts leads to reliable, maintenance-free operation over long periods.
Installation Flexibility & Cost Savings: Compact design simplifies installation between flanges, saving space, labor time, and piping material costs.
Improved Process Reliability: Ensures unidirectional flow, critical for the correct operation of many industrial processes in water treatment, HVAC, chemical, and power plants.
Quality Transparency: The provided Mill Test Report gives you verifiable proof of material quality and manufacturing integrity, essential for project documentation and quality audits.

With an established track record since 2016 and an annual export value reaching up to US$1.5 Million, Shanghai Zhibang Valve has proven its capability to supply reliable fluid control solutions to diverse markets worldwide, including North America, Europe, and Southeast Asia. Our ISO9001 certification underpins our commitment to consistent quality. This CB/T4303 Butterfly Check Valve, backed by a full Mill Test Report, represents a smart investment in system reliability and efficiency. We invite you to contact us to discuss your specific requirements, request a quotation, or explore our full range of valve solutions. Let our expertise help you secure your flow lines.

Frequently Asked Questions (FAQ):

What is the main function of this butterfly check valve?
This valve is a type of non-return or one-way valve. Its primary function is to allow fluid (liquid or gas) to flow in one direction only and automatically close to prevent backflow when the flow stops or reverses, thereby protecting upstream equipment.
Can this valve be installed in any orientation?
For optimal performance and reliable sealing, it is generally recommended to install butterfly check valves in a horizontal pipeline with the shaft in a horizontal position. Installation in vertical lines is possible but should be evaluated based on flow direction and specific model design; please consult our technicians.
What is included in the Mill Test Report (MTR)?
The MTR is a material certification document. For this valve, it typically includes chemical composition analysis, mechanical property tests (tensile strength, yield strength), impact test results for the body/disc materials, and records of the pressure tests (shell and seat) performed on the finished valve.
Is a spring assist available for faster closing?
Some models of butterfly check valves incorporate a torsion spring to assist in rapid disc closure, which is beneficial for mitigating water hammer. Our standard CB/T4303 valve may or may not include a spring; this is a configurable option. Please specify your need for spring-assisted closure when inquiring.
What flange standards do you support?
We can manufacture flanges to various international standards, including GB (Chinese), EN (European), ANSI (American), JIS (Japanese), and others. It is crucial to specify your required flange standard, pressure class (e.g., PN10, Class 150), and facing (e.g., RF) at the time of order to ensure compatibility.
What is the lead time for an order of DN50 valves?
Lead time depends on order quantity, specific material configuration, and current production schedule. For standard configurations like ductile iron body with EPDM seat, we often have stock or can produce within a few weeks. We provide a precise delivery schedule with our formal quotation.
How does this valve compare to a swing check valve?
Butterfly check valves are generally more compact, lighter, and have a lower pressure drop than swing check valves of the same size. They are often more cost-effective for larger diameters. Swing check valves might be preferred for applications with very low flow velocities or where a full-port opening is critical.
Do you offer customization for special media or temperatures?
Yes. We can customize materials (e.g., all 316 stainless steel construction), special coatings (epoxy, nylon), and seat compounds for highly corrosive media or extreme temperatures (-50°C to 200°C+). Customization options are available upon request with detailed application parameters.