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Help CenterCast Steel Butterfly Check Valve CB/T4303 DN300 PN2.0MPa for High Pressure Shipboard Applications
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As a specialized manufacturer with a proven track record since 2016, Shanghai Zhibang Valve Manufacture Co., Ltd. designs and produces the Cast Steel Butterfly Check Valve to meet the rigorous demands of high-pressure marine and industrial systems. Engineered for reliability and performance, this valve combines the compact, lightweight design of a butterfly valve with the critical backflow prevention function of a check valve, making it an ideal solution for shipboard applications where space and weight are at a premium. Our commitment to quality, backed by an ISO9001 certified manufacturing process, ensures that every valve delivers consistent performance under challenging conditions, protecting your valuable equipment and ensuring operational continuity.
This CB/T4303 standard valve is specifically engineered for high-pressure service up to PN2.0MPa (Class 150). The cast steel body, typically conforming to ASTM A216 WCB, provides excellent strength and corrosion resistance for demanding marine environments. The integrated design eliminates the need for separate check and isolation valves, saving on installation space, weight, and overall system cost. The valve operates automatically, opening with forward flow and closing swiftly to prevent reverse flow when pressure differentials change, ensuring system integrity.
Key Technical Features & Advantages:
- Dual Function Design: Integrates isolation and check functions into a single unit, simplifying piping layouts and reducing potential leak points.
- Robust Construction: The cast steel body and sturdy disc assembly are built to withstand high-pressure surges and the corrosive effects of seawater or aggressive media.
- Low Pressure Drop: The streamlined disc design minimizes flow resistance when open, contributing to energy efficiency in pumping systems.
- Quick, Automatic Closure: The disc closes rapidly under spring-assisted or gravity-assisted action, providing effective backflow prevention to protect pumps and other upstream equipment.
- Versatile Mounting: Available in wafer or lug styles to suit different piping connection requirements and facilitate easy installation between flanges.
- Customizable Sealing: Seat materials can be selected (e.g., PTFE for tight sealing, metal for high temperatures) based on specific service media and temperature requirements.
Primary Specifications (DN300 PN2.0MPa Model):
| Parameter | Specification / Value |
| Product Standard | CB/T4303 |
| Nominal Diameter (DN) | 300 mm |
| Pressure Rating (PN) | 2.0 MPa |
| Body Material | Cast Steel (WCB) |
| Disc Material | Stainless Steel (CF8/304) or as requested |
| Seat Material | PTFE, Reinforced PTFE, or Metal Seat |
| Connection Type | Wafer or Lug (End-to-End per CB/T4303) |
| Suitable Media | Water, Oil, Gas, Seawater (material dependent) |
Benefits for Your Operation:
- Enhanced System Protection: Prevents damaging water hammer and reverse flow, safeguarding expensive pumps, compressors, and other critical shipboard machinery.
- Space and Weight Savings: The compact butterfly design is significantly lighter and requires less installation space compared to traditional swing check or lift check valves of similar size, a critical advantage in marine engineering.
- Reduced Maintenance Costs: Robust construction and reliable sealing materials contribute to long service life and lower total cost of ownership.
- Operational Flexibility: Suitable for a wide range of orientations and can handle varying flow conditions commonly found in shipboard cooling, ballast, bilge, and fuel oil systems.
With an annual export value reflecting consistent global trust and a manufacturing base certified to ISO9001 standards, Shanghai Zhibang Valve delivers products that meet exacting international requirements. Our valves are shipped from major ports like Shanghai and Guangzhou, supporting a supply chain that efficiently reaches key markets across North America, Europe, Southeast Asia, and beyond. When you choose our Cast Steel Butterfly Check Valve, you are selecting a component built for reliability by a manufacturer dedicated to precision engineering and customer satisfaction. We encourage you to contact us to discuss how this valve can be integrated into your specific high-pressure shipboard application or to request detailed technical documentation.
Frequently Asked Questions (FAQ):
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Q: What is the main advantage of a butterfly check valve over a traditional swing check valve for shipboard use?
A: The primary advantages are its compact, lightweight design and lower pressure drop. This saves crucial space and weight on vessels and improves system efficiency, which are paramount considerations in marine applications. -
Q: Can this valve be installed in any orientation?
A: Yes, the CB/T4303 butterfly check valve is designed for installation in horizontal or vertical pipelines. However, for optimal performance and disc closure, specific orientation guidelines provided in the manual should be followed. -
Q: What is the meaning of the 'PN2.0MPa' rating?
A: PN stands for 'Pressure Nominal.' PN2.0MPa indicates the valve is rated for a maximum working pressure of 2.0 Megapascals (approximately 20 bar or 290 psi) at a specified temperature, typically room temperature. -
Q: Is the valve suitable for seawater service?
A: With appropriate material selections, such as a stainless steel disc (e.g., 316SS) and compatible seat materials, the valve can be configured for seawater service. It is important to specify the exact media during inquiry. -
Q: Does the valve require external power or control to operate?
A: No. It is a self-acting, automatic valve. It opens with forward flow pressure and closes using a combination of reverse flow and spring/gravity assistance, requiring no external power source. -
Q: What is the difference between wafer and lug style connections?
A: A wafer-style valve is sandwiched between two pipe flanges with long bolts. A lug-style valve has threaded inserts (lugs) on the valve body, allowing it to be bolted directly to each flange, which can be beneficial for system disassembly or end-of-line service. -
Q: Are other sizes and pressure ratings available?
A: Yes. While this listing highlights the DN300 PN2.0MPa model, we manufacture a range of sizes and pressure classes. Please inquire for availability of other specifications like DN50 to DN600 or different PN ratings. -
Q: What testing is performed on the valves before shipment?
A: Valves undergo routine tests which may include shell strength tests (hydrostatic), seat leakage tests, and operational checks to ensure they meet the performance standards specified in CB/T4303 and customer requirements.
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