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Home > Industrial Equipment & Components > Valve > Check Valve > GB/T1855 Marine Stop Check Valve For Freshwater Systems, Flanged Connection DN50 DN200

GB/T1855 Marine Stop Check Valve For Freshwater Systems, Flanged Connection DN50 DN200

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Product Spotlights

GB/T1855 compliant marine stop check valve for freshwater systems. Features flanged connections from DN50 to DN200 for easy integration. Constructed with durable materials (cast iron/ductile iron/stainless steel) to resist corrosion. Ensures reliable backflow prevention, protecting critical onboard systems. Available in multiple pressure ratings (PN10/16/25) and seal materials for customization. Suitable for horizontal or vertical installation. A cost-effective, low-maintenance solution backed by ISO9001 certified manufacturing.

Negotiable MOQ: 1 Unit (Price negotiable depending on order volume and customization)

Key Specifications

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Material:

Other, Cast Iron, Ductile Iron, Stainless Steel

Standard:

Other, GB/T1855

Product Name:

GB/T1855 Marine Stop Check Valve

Contact Supplier Request Quote Chat Now

Shanghai Zhibang Valve Manufacture Co.,ltd

1Yr

Payment & Shipping

Payment Methods:

Port of Shipment:

China

Delivery Detail:

Delivery time depends on order quantity.

Product Details
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Material Other, Cast Iron, Ductile Iron, Stainless Steel

Standard Other, GB/T1855

Product Name GB/T1855 Marine Stop Check Valve

Connection Type Flanged Connection

Size Range DN50 to DN200

Application System Freshwater Systems

Pressure Rating PN10, PN16, PN25

Seat Material NBR, EPDM, PTFE

Design Swing Check, Lift Check

Installation Horizontal or Vertical

As a specialized manufacturer with a focus on marine fluid control solutions, Shanghai Zhibang Valve Manufacture Co., Ltd. proudly presents our GB/T1855 Marine Stop Check Valve for freshwater systems. Engineered for reliability in demanding maritime environments, this valve is designed to prevent backflow and ensure unidirectional flow, safeguarding critical onboard freshwater systems. With years of experience exporting to global markets, we understand the stringent requirements for marine-grade components, and our flanged connection valves from DN50 to DN200 are built to meet those challenges head-on.

Core Features & Technical Advantages:

Robust Construction for Marine Use: Manufactured from high-grade materials such as cast iron, ductile iron, or stainless steel (optional), the valve body resists corrosion from freshwater and occasional brackish conditions. The internal components, including the swing or lift check mechanism, are precision-engineered for smooth operation and long service life.
Flanged Connection Convenience: The standardized flanged ends (RF or FF face optional) ensure a secure, leak-proof connection to existing pipeline systems. This design simplifies installation, maintenance, and replacement, reducing downtime for vessel operators.
Reliable Backflow Prevention: The primary function of this stop check valve is to automatically close upon flow reversal, preventing contamination of the freshwater supply. This is critical for potable water systems, cooling circuits, and other essential services on ships and offshore platforms.
Versatile Size and Pressure Range: Available in sizes from DN50 (2") to DN200 (8"), with pressure ratings of PN10, PN16, or PN25 (customizable), this valve series can be tailored to fit a wide array of system specifications and pressure requirements.
Low Pressure Drop Design: The internal flow path is optimized to minimize resistance, ensuring efficient system performance and reducing pump energy consumption.

Detailed Specifications & Configurations:

Parameter	Specification / Option
Product Standard	GB/T1855 (Chinese National Standard for Check Valves)
Nominal Diameter (DN)	50, 65, 80, 100, 125, 150, 200 mm
Connection Type	Flanged (RF/FF), ASME B16.5 or DIN2501 pattern available
Pressure Rating (PN)	PN10, PN16, PN25 (Standard: PN16)
Body Material	Cast Iron (WCB), Ductile Iron (WCC), Stainless Steel (CF8/CF8M) - Optional
Disc / Seal Material	NBR, EPDM, PTFE (for different temperature & media compatibility)
Suitable Medium	Fresh Water, Sea Water (with compatible material selection), Oil, Gas
Operating Temperature	-10°C to +120°C (depends on seat material)
Installation Position	Horizontal or Vertical (flow direction upward)

Benefits for Your Operations:

System Safety & Integrity: Protects pumps and other equipment from damage due to reverse flow and water hammer.
Reduced Maintenance: Durable construction and reliable sealing minimize the need for frequent inspections and replacements.
Global Compliance: While designed to GB/T1855, the valve's construction can be adapted to meet other international marine standards upon request.
Cost-Effective Solution: Offers a balance of performance, durability, and value, making it a sensible choice for both new builds and retrofits.

Shanghai Zhibang Valve Manufacture Co., Ltd. stands behind every valve we produce. Our commitment to quality is underscored by our ISO9001 certification, ensuring consistent manufacturing processes. With an annual export value reaching up to US$1.5 million, we have successfully supplied reliable valve solutions to diverse markets across North and South America, Europe, Asia, Africa, and Oceania. Our strategic location in Shanghai and multiple shipment ports (Shanghai, Guangzhou, Hong Kong, Beijing) enable efficient logistics and timely delivery. Choose our GB/T1855 Marine Stop Check Valve for a proven, dependable component that enhances the safety and efficiency of your vessel's freshwater systems. Contact us today for a detailed quotation or to discuss your specific project requirements.

Frequently Asked Questions (FAQ):

Q: What is the main difference between a "stop check valve" and a standard check valve?
A: A stop check valve combines the functions of a check valve (preventing backflow) and a stop valve (allowing manual shut-off). It can be manually closed to isolate flow even when forward pressure is present, offering additional control.
Q: Can this valve be used with seawater systems?
A: While designed primarily for freshwater, it can be configured for seawater service by selecting appropriate corrosion-resistant materials like stainless steel (CF8M) and compatible seals (e.g., EPDM, Viton). Please specify your medium during inquiry.
Q: Are the flanges compatible with ANSI/DIN/JIS standards?
A: Yes. We typically manufacture to ASME B16.5 or DIN2501 flange standards. It is crucial to specify your required flange standard, pressure class, and facing (RF/FF) when ordering to ensure perfect compatibility.
Q: What is the typical delivery lead time for an order?
A: Lead times vary based on order quantity, material selection, and customization. For standard DN50-DN200 valves in cast iron/PN16, production typically takes 15-30 days after order confirmation, plus shipping time.
Q: Do you provide testing certificates for the valves?
A: Yes, standard factory tests (shell test, seat test) are performed, and a test report can be provided. More comprehensive certification, such as third-party inspection, is available upon request.
Q: Is the valve suitable for vertical installation?
A: Yes, this swing or lift check valve design is suitable for both horizontal and vertical installation. For vertical installation, the flow direction must be upward to ensure proper disc closure.
Q: What maintenance does this valve require?
A: These valves are designed for minimal maintenance. Periodic inspection for external leakage and operational smoothness is recommended. Internal parts like the disc and seat are replaceable if wear occurs after extended service.
Q: Can you provide valves with special coatings or painting?
A: Absolutely. We can apply standard marine-grade epoxy coatings or other specific paint systems as per client specifications to enhance corrosion protection.