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Help CenterMarine Stop Check Valve for Pump, GB/T1855 Compliant With Technical Data Sheet
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As a professional valve manufacturer with ISO9001 certification, Shanghai Zhibang Valve Manufacture Co., Ltd. is proud to present our high-performance Marine Stop Check Valve. Engineered specifically for demanding marine pump applications, this valve is designed to prevent backflow, protect critical pump systems, and ensure operational safety on board vessels. Our commitment to quality, evident in our annual export value of US$1-1.5 million, is built into every valve we produce. Compliant with the GB/T1855 standard, this valve offers reliable, maintenance-free service, making it a trusted component for shipbuilders and marine engineers worldwide.
This Marine Stop Check Valve serves a dual function: it acts as a standard stop valve for isolating flow and as a check valve to automatically prevent reverse flow when the pump stops. This combination protects pumps from water hammer and reverse rotation, significantly extending equipment life and reducing downtime. Constructed from robust materials suitable for seawater and marine environments, it is a cornerstone for safe and efficient ship operations.
Key Features & Technical Advantages:
- Dual-Function Design: Integrates stop and check valve functionalities into a single, compact unit, saving space and installation costs on board.
- GB/T1855 Compliance: Manufactured in strict accordance with the Chinese national standard for marine valves, ensuring compatibility and reliability for ship systems.
- Non-Slam, Silent Operation: The internal disc design ensures smooth, automatic closing without water hammer or loud slamming noises, protecting pipeline integrity.
- Low Pressure Drop: Optimized flow path design minimizes resistance, improving pump efficiency and reducing energy consumption.
- Corrosion Resistance: Available in a range of materials, including coated cast iron and stainless steel, to withstand harsh marine atmospheres and seawater.
- Maintenance-Friendly: Designed for easy inspection and service, with accessible internals that can often be maintained without removing the valve from the line.
Technical Specifications Table:
| Parameter | Specification |
| Product Standard | GB/T1855 |
| Nominal Pressure (PN) | PN10, PN16, PN25, PN40 |
| Nominal Diameter (DN) | DN50, DN65, DN80, DN100, DN150, DN200, DN250, DN300, DN350, DN400, DN450, DN500, DN600 |
| Main Body Material | Cast Iron (HT250), Ductile Iron (QT450-10), Carbon Steel (WCB), Stainless Steel (CF8/CF8M), Bronze |
| Seat & Disc Material | Stainless Steel, Bronze, NBR/EPDM Rubber |
| Connection Standard | GB/T 17241 (Flanged), JIS, DIN, ANSI standards available upon request |
| Test Standard | Shell Test & Seat Test per GB/T 13927 |
| Applicable Medium | Sea Water, Fresh Water, Oil, Air |
| Operating Temperature | -10°C to 120°C (depending on seal material) |
Benefits for Your Marine Operations:
- Enhanced System Protection: Safeguards pumps and compressors from damage caused by backflow and reverse rotation, leading to lower maintenance costs.
- Operational Safety: Prevents unintended flooding or system contamination, a critical factor for maritime safety standards.
- Space and Cost Efficiency: Replaces two valves (a gate valve and a check valve) with one, reducing weight, footprint, and total installed cost.
- Improved Reliability: The simple, robust mechanism has fewer failure points compared to complex automated systems, ensuring dependable performance in critical situations.
- Global Supply Capability: With major shipment ports in Shanghai, Guangzhou, Hong Kong, and Beijing, we ensure timely delivery to our global clientele across North America, South America, Europe, Asia, Africa, and Oceania.
Trust in a manufacturer with a proven track record. Since our establishment in 2016, Shanghai Zhibang has consistently delivered high-quality marine valves, earning the trust of partners across six continents. Our ISO9001 certification underpins our systematic approach to quality control, from raw material sourcing to final inspection. This Marine Stop Check Valve embodies our expertise—it's not just a component; it's a commitment to the safety and efficiency of your vessel. Contact us today with your technical requirements to receive a detailed data sheet and discover how our valves can be integrated into your next project.
Frequently Asked Questions (FAQ)
Q1: What is the primary function of a stop check valve in a marine pump system?
A: It serves two key functions. First, it can be manually closed like a stop valve to isolate the pump for maintenance. Second, it automatically acts as a check valve, preventing reverse flow through the pump when it is turned off, which protects the pump from damage.
Q2: How does compliance with GB/T1855 benefit me as an international buyer?
A: GB/T1855 is a recognized Chinese national standard for marine valves, specifying requirements for design, materials, pressure testing, and markings. Compliance ensures the valve is fit for marine service, offers predictable performance, and is widely accepted in shipbuilding and repair, especially for vessels with Chinese components or operating in related markets.
Q3: Can this valve be used for media other than seawater?
A: Yes. While designed for marine environments, it is suitable for various fluids including fresh water, oil, and air. The specific material configuration (body, seat, seal) can be selected based on the chemical properties and temperature of the medium to ensure optimal compatibility and longevity.
Q4: What are the available pressure ratings and sizes?
A: We offer standard pressure classes from PN10 to PN40. The nominal diameter (DN) range is typically from DN50 (2") up to DN600 (24"). Specific sizes outside this range may be available as a custom order. Please consult our technical data sheet for the complete matrix.
Q5: What is the lead time for standard orders?
A: Lead times vary based on order quantity, size, material specification, and current production schedule. Standard configurations often have shorter lead times. We prioritize efficient production and logistics, shipping from major ports like Shanghai and Hong Kong to facilitate swift global delivery.
Q6: Do you provide documentation and certification with the valves?
A: Yes. Each shipment is accompanied by essential documentation, which includes a commercial invoice, packing list, and a material certificate. A factory test report per GB/T 13927 (shell and seat test) is also provided. Certificates of origin and other specific documents are available upon request.
Q7: Is the valve suitable for vertical installation?
A: The standard design is typically for horizontal pipeline installation. Installation orientation can affect operation and spring requirements. It is crucial to provide your intended installation details during the inquiry so we can confirm suitability or recommend the correct configuration.
Q8: What after-sales support do you offer?
A: We provide comprehensive technical support, including installation guidance and operational advice. While we supply high-quality, durable products, we also can supply genuine spare parts like seal kits to support maintenance over the valve's long service life.
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