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Help CenterMarine Parallel Slide Gate Valve for Cargo Oil Transfer Systems, Standard Compliant
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As a specialized manufacturer with a proven track record since 2016, Shanghai Zhibang Valve Manufacture Co., Ltd. is proud to present our high-performance Marine Parallel Slide Gate Valve. Engineered specifically for the demanding environments of cargo oil transfer systems, this valve is built to ensure reliable, leak-free service and operational safety on tankers, FPSOs, and offshore platforms. Our commitment to quality, backed by ISO9001 certification, ensures every valve meets stringent international standards, providing shipowners and operators with a dependable solution for critical fluid control.
Product Overview & Core Advantages
Our Marine Parallel Slide Gate Valve is designed for high-pressure, high-temperature applications involving crude oil, fuel oil, and other hydrocarbon products. Its parallel slide mechanism offers superior sealing performance and minimal pressure drop, making it an ideal choice for main cargo lines, loading arms, and manifold systems.
- Robust Construction & Materials: Manufactured from premium-grade materials such as carbon steel (WCB, LCB), stainless steel (CF8M, CF3M), or duplex steel, the valve body ensures exceptional corrosion resistance and mechanical strength. The parallel gate and seat are often made from hardened alloys or stainless steel, providing excellent wear resistance and extended service life even with abrasive media.
- Superior Sealing Performance: Unlike wedge gate valves, the parallel slide design utilizes two parallel discs that are forced against the seats by line pressure. This creates a tight, bi-directional seal that is highly effective, minimizing the risk of internal leakage—a critical factor for environmental protection and cargo loss prevention.
- Low Operating Torque & Easy Maintenance: The sliding action requires lower operating torque compared to rising stem designs, reducing wear on the stem and actuator. The valve is designed for easy in-line maintenance, with many models featuring a bolted bonnet for straightforward access to internal components.
- Versatile Actuation Options: To suit various operational requirements, our valves can be supplied with manual handwheels, gear operators, or automated actuators (electric, pneumatic, or hydraulic). This flexibility allows for integration into both manual and fully automated cargo control systems.
Detailed Technical Specifications
The following table outlines the standard specifications for our Marine Parallel Slide Gate Valve. Custom configurations are available upon request to meet specific project requirements.
| Parameter | Specification / Options |
| Size Range (Nominal Diameter) | DN50 (2") to DN1200 (48") |
| Pressure Class (ANSI/ASME) | Class 150, 300, 600, 900, 1500, 2500 |
| Temperature Range | -29°C to 425°C (Standard), higher grades available |
| End Connection | Flanged (RF, RTJ), Butt Weld, Socket Weld |
| Flange Standards | ASME B16.5, ASME B16.47, DIN, JIS, BS |
| Body & Bonnet Material | A216 WCB, LCC, WC6; A351 CF8M, CF3M; Duplex, Alloy 20 |
| Gate & Seat Material | 13% Cr Stainless Steel, Stellite, Hard-faced Alloys |
| Stem Material | Stainless Steel (410, 304, 316), Alloy Steel |
| Packing Material | Graphite, PTFE, Flexible Graphite for fire-safe design |
| Design & Test Standards | API 600, API 6D, API 598, BS 1414, ASME B16.34 |
| Fire Safe Certification | API 607 / API 6FA compliant options available |
| Surface Treatment | Paint (Epoxy, FBE), Electroless Nickel Plating, Galvanizing |
Application Benefits for Your Operations
- Enhanced Safety & Environmental Compliance: The reliable bi-directional seal significantly reduces the risk of hydrocarbon leaks, protecting personnel, assets, and the marine environment. Fire-safe designs provide an extra layer of safety in emergency scenarios.
- Reduced Operational Costs: The durable construction and low maintenance design lead to longer service intervals and lower lifecycle costs. The low operating torque can also reduce the size and cost of required actuators.
- High Flow Efficiency: The full-bore design offers minimal flow restriction, reducing pressure drop across the valve and improving the efficiency of cargo transfer pumps.
- Global System Compatibility: Manufactured to major international standards (API, ASME, BS), our valves are compatible with piping systems worldwide, facilitating easy installation and replacement.
Frequently Asked Questions (FAQ)
Q1: What is the main advantage of a parallel slide gate valve over a traditional wedge gate valve for cargo oil service?
A: The parallel slide design provides a more reliable seal under varying pressures and temperatures. The parallel discs are forced against the seats by line pressure, creating a tight seal that is less prone to jamming or sticking, which is common with wedge gates in viscous oil services. It also offers bi-directional sealing capability.
Q2: Can this valve be used for both loading and unloading operations?
A: Absolutely. The valve is designed for bi-directional flow, making it perfectly suitable for both loading (filling tanks) and unloading (discharging cargo) processes within the transfer system.
Q3: Are your valves suitable for cold climates or cryogenic service?
A: Standard valves are rated for temperatures down to -29°C. For applications in arctic conditions or with LNG/LPG, we offer specially designed low-temperature and cryogenic valves with extended bonnets and appropriate material grades. Please inquire for specific requirements.
Q4: What actuation methods do you recommend for remote operation on a tanker?
A: For remote and centralized control, we highly recommend electric or hydraulic actuators. Hydraulic actuators are often preferred in marine environments due to their high power density, explosion-proof nature, and reliability. We can supply the valve pre-assembled with a suitable actuator package.
Q5: Do you provide documentation and certification with the valves?
A: Yes. Each valve is supplied with a comprehensive documentation package, including Material Test Certificates (MTC), Pressure Test Reports, Dimensional Drawings, and a detailed Operation & Maintenance Manual. Certificates of Conformity to specified standards are also provided.
Q6: What is your lead time for large bore valves (e.g., DN600 and above)?
A: Lead times vary based on material, pressure class, and order quantity. For large bore, high-class valves, typical production lead times range from 12 to 20 weeks. We recommend early engagement in the project planning phase to ensure timely delivery.
Q7: Can you customize the valve trim or coating for specific cargo types?
A: Yes, customization is a key strength. We can adjust seat/gate materials (e.g., using Stellite hard-facing for erosive service) and apply specialized internal coatings (like FBE or exotic alloys) to handle aggressive or corrosive cargoes such as sour crude or chemicals.
Q8: What are your main shipping ports and export experience?
A: We regularly export from major Chinese ports including Shanghai, Guangzhou, Hong Kong, and Beijing. With an annual export value between US$1 Million and US$1.5 Million, we have extensive experience delivering to global markets across North and South America, Europe, Asia, Africa, and Oceania, ensuring smooth logistics.
Trust in a manufacturer with a solid foundation. Since our establishment in 2016, Shanghai Zhibang Valve has built a reputation for delivering robust and reliable industrial valves. Our ISO9001 certified quality management system governs every stage of production, from material sourcing to final testing. Supported by an annual export value demonstrating consistent global trust, we have successfully supplied valves to demanding projects across five continents. Choose our Marine Parallel Slide Gate Valve for your next cargo oil transfer system—a decision backed by professional manufacturing expertise, strict compliance with international standards, and a commitment to your operational safety and efficiency. Contact us today for a detailed quotation or to discuss your specific application requirements.
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