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Help CenterDNV BV Approved Zhibang Valve Marine Flanged Dual Plate Check Valve Cast Steel DN50-DN300 PN1.6-4.0MPa
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Shanghai Zhibang Valve Manufacture Co., Ltd. has been a trusted manufacturer in the valve industry since 2016, specializing in high-performance industrial valves for marine and general piping systems. Our Zhibang brand DNV BV Approved Marine Flanged Dual Plate Check Valve is engineered to deliver reliable backflow prevention in demanding applications. Cast in high-strength steel and available in sizes from DN50 to DN300 with pressure ratings from PN1.6 to 4.0 MPa, this valve is designed for long service life and minimal maintenance. With annual export values exceeding US$1 million and a global market presence across North America, Europe, Southeast Asia, and beyond, we are committed to providing quality solutions that meet international standards.
The dual plate check valve features a compact, lightweight design compared to traditional swing check valves, reducing installation space and material cost. Its spring-assisted plates ensure quick closing action, preventing water hammer and protecting downstream equipment. The flanged ends conform to widely accepted standards, making installation straightforward in existing piping systems. Each valve undergoes rigorous quality control and is certified with DNV BV approval, ensuring compliance with marine classification society requirements.
Key Features & Technical Specifications
- High-Quality Cast Steel Body: Provides excellent strength and corrosion resistance, suitable for seawater, oil, gas, and other media.
- DNV BV Approved Design: Meets strict marine classification standards, ensuring safety and reliability in offshore and shipboard applications.
- Compact Dual Plate Mechanism: Reduces pressure drop and allows for shorter face-to-face dimensions, saving space and weight.
- Spring-Assisted Closure: Ensures rapid response to flow reversal, minimizing slam and water hammer effects.
- Flanged Connections: Available in PN1.6, PN2.5, PN4.0 MPa ratings, compatible with standard flange dimensions (DIN, ANSI, GB optional).
- Wide Size Range: From DN50 to DN300, covering a broad spectrum of pipeline requirements.
- ISO9001 Certified Manufacturing: Consistent quality control from raw material to final testing.
- Low Maintenance: Simple construction with few moving parts reduces downtime and service costs.
| Parameter | Specification |
| Body Material | Cast Steel (WCB, LCB, CF8, CF8M optional) |
| Plate Material | Stainless Steel (SS304, SS316) |
| Size Range | DN50 – DN300 (2″ – 12″) |
| Pressure Rating | PN1.6 / PN2.5 / PN4.0 MPa (150/300 lbs optional) |
| End Connection | Flanged (DIN, ANSI, BS, GB) |
| Temperature Range | -29°C to +425°C |
| Certifications | DNV BV, ISO9001 |
| Application | Marine, Offshore, Oil & Gas, Water, Chemical |
The Zhibang dual plate check valve offers significant advantages over conventional check valves. Its lightweight design reduces pipe stress and support requirements. The short face-to-face dimension allows for installation in tight spaces, and the low pressure drop improves system efficiency. For maintenance, the valve can be easily serviced without removing from the pipeline in many configurations. Whether you need a valve for seawater cooling systems, fire-fighting lines, or general process piping, this product delivers consistent performance.
Quality assurance is at the core of our manufacturing. Each valve is hydrostatically tested at 1.5 times the rated pressure and shell tested at 1.1 times. The dual plates are spring-loaded and tested for proper seating. Our ISO9001-certified facilities in Shanghai ensure traceability from casting to final assembly. With annual export revenue between US$1 million and US$1.5 million, we supply valves to over a dozen countries across North America, South America, Europe, Africa, Oceania, and Asia. Our experienced team provides technical support, customization options, and timely delivery from ports including Shanghai, Guangzhou, Hongkong, and Beijing.
Why Choose Zhibang? Since 2016, we have been dedicated to manufacturing reliable valves. Our DNV BV approved dual plate check valve reflects our commitment to marine-grade quality. Backed by ISO9001 certification, a global customer base, and flexible shipping options, Zhibang is your partner for durable flow control solutions. Contact us today to request a quote, ask about customized pressure ratings, or place an order. We look forward to serving your project needs.
Frequently Asked Questions (FAQ)
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Q: Is this valve suitable for seawater applications?
A: Yes, the cast steel body can be fitted with stainless steel plates (SS304 or SS316) to resist corrosion in seawater. For highly saline environments, we recommend the CF8M (316 stainless steel) body option. -
Q: What is the difference between dual plate and swing check valves?
A: Dual plate check valves are more compact and lightweight, with a shorter face-to-face dimension. They close faster due to spring assistance, reducing water hammer. They are ideal for space-constrained installations. -
Q: Does the valve come with DNV BV certification documents?
A: Yes, each valve is supplied with a DNV BV type approval certificate upon request. We can also provide material test reports and hydrostatic test certificates. -
Q: Can I get the valve in ANSI 150 or 300 pressure class?
A: Yes, we offer flanged ends in ANSI 150 and 300 class ratings as an option. Please specify your requirement when ordering. -
Q: What is the typical lead time for DN50-DN300 valves?
A: For standard sizes and materials, lead time is 15-25 working days. Custom orders may require 30-45 days. We ship from Shanghai, Guangzhou, Hongkong, or Beijing. -
Q: Are replacement parts (springs, plates) available?
A: Yes, we supply spare parts kits. The valve design allows easy replacement of worn plates and springs without removing the valve body from the line. -
Q: Does the valve comply with marine classification society rules other than DNV?
A: This model is specifically DNV BV approved. If you require ABS, Lloyd's, or other certifications, we can evaluate on a case-by-case basis with additional testing. -
Q: What is the maximum temperature this valve can handle?
A: The standard design handles temperatures from -29°C to +425°C. For higher temperature applications, special materials (e.g., alloy steel) can be used – please consult our engineering team.
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