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Help CenterDN80 Marine Check Valve With Counterweight, Slow Closing Design, Cast Steel Construction
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As a professional manufacturer with ISO9001 certification, Shanghai Zhibang Valve Manufacture Co., Ltd. specializes in delivering robust and reliable fluid control solutions for demanding marine environments. Our DN80 Marine Check Valve with Counterweight and Slow Closing Design represents our commitment to engineering excellence, specifically developed to prevent water hammer, ensure secure backflow prevention, and enhance the operational safety of shipboard piping systems. Built with durable cast steel construction, this valve is engineered to withstand the harsh conditions of sea water and variable pressures, offering shipbuilders, repair yards, and offshore operators a dependable component for critical applications.
The core innovation of this valve lies in its integrated slow-closing mechanism. Unlike standard swing check valves that can slam shut, causing destructive pressure surges (water hammer), this design utilizes an external counterweight. This counterweight provides controlled resistance, allowing the disc to close gently once forward flow stops. This feature is crucial for protecting pumps, pipes, and fittings from stress and fatigue, significantly reducing maintenance costs and downtime.
Key Product Features & Technical Advantages:
- Cast Steel Body: Offers superior strength, corrosion resistance, and durability compared to standard iron, making it ideal for marine service with sea water, bilge, ballast, and cooling systems.
- Precision Slow-Closing Action: The adjustable external counterweight ensures a gradual valve closure rate, effectively mitigating water hammer and associated pipeline vibrations.
- Enhanced Seal Integrity: Features a precision-machined seat paired with a resilient or metal-seated disc (depending on specification) to ensure tight shut-off and prevent backflow, even under low-pressure conditions.
- Low Maintenance Design: The simple swing mechanism with few moving parts and external counterweight adjustment minimizes the need for frequent servicing. Hinge pin is designed for long life and easy replacement if needed.
- Versatile Mounting: Standard flanged connections (e.g., ANSI, JIS, DIN standards available) facilitate easy installation into existing DN80 pipeline networks.
- Customizable Options: Available with various trim materials (e.g., 316 Stainless Steel, Monel, Bronze) to suit specific fluid media and corrosion requirements. A locking device can be supplied to hold the disc in the open position for system maintenance.
Detailed Technical Specifications:
| Parameter | Specification |
| Nominal Size | DN80 (3" NPS) |
| Pressure Class | PN16 / Class 150 (Higher ratings available) |
| Body Material | Cast Steel (WCB, LCC, etc.) |
| Disc & Seat Material | Standard: Stainless Steel (304/316) + Resilient Seat. Optional: All Metal Seats. |
| Connection | Flanged, RF Face. Standards: ANSI, JIS, DIN, GB. |
| Design Standard | API 594, API 6D, BS 1868, or equivalent marine standards. |
| Counterweight | External, adjustable for closing speed control. |
| Temperature Range | -29°C to +425°C (depending on seat material) |
Benefits for Your Marine Operations:
- System Protection: Eliminates water hammer, safeguarding pumps, gauges, pipes, and sensitive equipment from shock damage.
- Operational Safety: Prevents dangerous reverse flow in critical systems like fire mains, engine cooling, and ballast systems.
- Reduced Lifetime Cost: Lower maintenance requirements and extended service life of connected equipment translate to significant cost savings.
- Compliance & Reliability: Manufactured under an ISO9001 quality system, ensuring consistent performance meeting international marine industry expectations.
- Global Support: With annual exports valued between US$1-1.5 million and serving markets across North America, Europe, Asia, Africa, and Oceania, Zhibang Valve has proven its capability to supply reliable products globally, supported by major shipment ports like Shanghai, Guangzhou, Hong Kong, and Beijing.
Choosing Shanghai Zhibang's DN80 Marine Check Valve means investing in the longevity and safety of your vessel's piping infrastructure. Our eight years of manufacturing expertise since 2016, combined with a strict adherence to quality control, ensures you receive a valve that performs reliably under pressure. We invite shipowners, naval architects, and marine equipment suppliers to contact us for detailed quotations, technical data sheets, and to discuss custom requirements. Partner with a trusted manufacturer to secure your fluid systems with our advanced slow-closing check valve solution.
Frequently Asked Questions (FAQ):
Q1: What is the main purpose of the counterweight on this check valve?
A1: The counterweight is specifically designed to create a slow-closing action. It provides adjustable resistance against the disc's return swing, preventing it from slamming shut when forward flow ceases. This controlled closure is essential to eliminate water hammer.
Q2: Can this valve be used with fluids other than sea water?
A2: Absolutely. While constructed with marine applications in mind, its cast steel body and availability of various trim materials (like stainless steel, bronze, or special alloys) make it suitable for a wide range of fluids including oil, fuel, chemicals, and steam in industrial settings, provided the material compatibility is confirmed.
Q3: Is the closing speed adjustable after installation?
A3: Yes, a key feature is the adjustable external counterweight. By altering the position or mass of the counterweight (if designed for it), the closing speed can be fine-tuned on-site to match the specific dynamics of your piping system for optimal performance.
Q4: What flange standards do you offer?
A4: We typically manufacture valves with flanges conforming to common international standards such as ANSI (ASME B16.5), JIS, DIN, and GB (Chinese national standard). The specific standard and pressure class (e.g., Class 150, PN16) should be specified at the time of ordering.
Q5: How does this valve compare to a standard swing check valve in terms of maintenance?
A5: It requires similar, minimal maintenance for the hinge and seat. The primary maintenance advantage is indirect: by preventing water hammer, it drastically reduces wear and tear on the entire pipeline system, leading to fewer leaks, pump repairs, and component failures over time.
Q6: Do you provide certifications or test reports with the valve?
A6: As an ISO9001 certified manufacturer, we conduct rigorous factory tests, including shell tests and seat leakage tests. Detailed test reports and material certificates (MTC) can be provided upon request to support classification society requirements or client specifications.
Q7: What is the lead time for an order of DN80 valves?
A7: Lead time varies based on order quantity, specific material requirements, and current production schedule. For standard configurations in cast steel WCB, we generally maintain competitive lead times. Please contact our sales team with your project timeline for an accurate delivery estimate.
Q8: Can the valve be supplied with a locking device?
A8: Yes, a locking device is a common optional feature. It allows the disc to be secured in the fully open position, which is essential for safe isolation and maintenance work on downstream equipment. Please indicate this requirement when inquiring.
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