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Help CenterGB/T1855 Marine Stop Check Valve For Freshwater, DN50 DN200 PN1.0MPa
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As a leading manufacturer with ISO9001 certification, Shanghai Zhibang Valve Manufacture Co., Ltd. is proud to present our high-performance GB/T1855 Marine Stop Check Valve. Engineered specifically for demanding freshwater applications on ships and offshore platforms, this valve combines the critical functions of a stop valve and a check valve into a single, reliable unit. Our commitment to quality, honed since our establishment in 2016 and proven through exports to global markets, ensures this valve delivers the durability and safety required for marine environments. It is designed to prevent costly backflow incidents while allowing for positive shut-off when maintenance is needed, offering a robust solution for shipbuilders, repair yards, and marine system integrators.
This valve is meticulously constructed to meet the stringent GB/T1855 standard, ensuring compatibility and reliability in Chinese and international marine projects. Its primary role is to permit flow in one direction and prevent reverse flow (check valve function), while also providing a means to manually stop all flow completely (stop valve function). This dual functionality is crucial for protecting pumps, compressors, and other critical equipment from damage caused by water hammer or backflow in freshwater cooling, ballast, firefighting, and potable water systems.
Key Features and Technical Advantages:
- Integrated Dual Function: Eliminates the need for separate valve installations, saving space, weight, and installation costs in tight engine rooms and piping systems.
- Robust Construction: The valve body is typically crafted from high-grade cast iron, ductile iron, or cast steel, offering excellent corrosion resistance against freshwater. Internal components like the disc and seat are available in materials such as bronze or stainless steel for enhanced longevity.
- Automatic and Manual Control: The check function operates automatically based on flow pressure. The stop function is actuated via an external handwheel or lever, allowing crew to isolate sections of the pipeline securely.
- Enhanced Safety: Prevents the dangerous and damaging effects of reverse flow, safeguarding expensive marine machinery and ensuring system integrity.
- Low Maintenance Design: Features a simple, sturdy design with accessible internals for easy inspection and servicing, minimizing downtime and operational costs.
Technical Specifications Table:
| Parameter | Specification |
|---|---|
| Product Standard | GB/T1855 |
| Nominal Diameter (DN) | 50, 65, 80, 100, 125, 150, 200 mm |
| Pressure Rating (PN) | 1.0 MPa (≈10 bar) |
| Applicable Medium | Fresh Water |
| Body Material Options | Cast Iron, Ductile Iron, Cast Steel |
| Disc & Seat Material Options | Bronze, Stainless Steel, Rubber-Coated |
| Connection Type | Flanged (Dimensions per GB/T standard) |
| Operation Temperature | Standard: -20°C to 120°C (varies with material) |
| Optional Features | External Lever & Weight Kit, Position Indicator |
The design ensures tight sealing in both the fully open and fully closed positions. When flow pressure drops or reverses, the disc automatically swings closed to prevent backflow. For maintenance, the handwheel can be used to screw the disc firmly against its seat, creating a positive seal equivalent to a standard gate valve. Available in sizes from DN50 to DN200, it caters to a wide range of pipeline requirements on various vessel types.
Choosing Shanghai Zhibang's Marine Stop Check Valve means investing in a component backed by a manufacturer with a solid track record. Since 2016, we have built a reputation for quality, exporting over US$1 million worth of valves annually to key markets across North America, Europe, Southeast Asia, and beyond. Our ISO9001 certified production process guarantees consistent quality control from raw material to finished product. With major shipment ports in Shanghai, Guangzhou, Hong Kong, and Beijing, we ensure reliable and timely delivery to your project site, whether it's a shipyard in Eastern Europe or an offshore platform in Oceania. Trust in our expertise to provide a valve that enhances the safety, efficiency, and reliability of your marine freshwater systems. Contact us today for a quotation or to discuss your specific application requirements.
Frequently Asked Questions (FAQ):
Q1: What is the main difference between a standard check valve and this stop check valve?
A1: A standard check valve only prevents reverse flow automatically. Our stop check valve adds a manual override feature, allowing you to mechanically force the disc closed to stop all flow for system isolation, which a standard check valve cannot do.
Q2: Can this valve be used for seawater applications?
A2: This specific model is designed and rated for freshwater systems. For seawater, we recommend valves constructed with more corrosion-resistant materials like super duplex stainless steel. Please inquire about our marine valves for seawater service.
Q3: Is the flange connection compatible with international standards like ANSI or JIS?
A3: The valve is manufactured to the GB/T standard for flange dimensions. Compatibility with ANSI or JIS flanges depends on the specific pressure class and facing. We can provide valves with adapters or manufacture to other standards upon request.
Q4: How does the automatic check function work? Does it require external power?
A4: The check function is entirely mechanical and requires no external power. The disc is hinged and swings open under forward flow pressure. When flow stops or reverses, gravity and back pressure cause the disc to swing shut, sealing the seat.
Q5: What maintenance is typically required for this valve?
A5: Maintenance is minimal. Periodic external inspection for leaks and operational checks of the handwheel are recommended. Internally, the seat and disc may need inspection or replacement after extended service, depending on water quality and cycling frequency.
Q6: Do you offer customization for different pressures or sizes outside the DN50-DN200 range?
A6: Yes, as a manufacturer, we have the capability to customize valves. Different pressure ratings (e.g., PN1.6MPa) and sizes outside the standard range can be discussed based on your project specifications.
Q7: What is the typical lead time for an order of DN100 valves?
A7: Lead time varies based on order quantity and material selection. For standard cast iron valves in common sizes, we often have stock or short production cycles. We provide specific lead time estimates with every quotation.
Q8: Are testing certificates provided with the valves?
A8> Yes, we can provide standard factory test reports, including shell test and seat leakage test, in accordance with GB/T standards. Other specific certification requirements can be discussed.
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