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Help CenterCast Steel Marine Parallel Slide Gate Valve, DN50-DN200, PN1.6-10MPa Flanged Connection
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As a leading manufacturer with ISO9001-certified production processes, Shanghai Zhibang Valve is dedicated to providing robust and reliable fluid control solutions for the demanding marine industry. Our Cast Steel Marine Parallel Slide Gate Valves are engineered specifically to withstand the harsh conditions of offshore and shipboard applications, offering exceptional sealing performance, durability, and ease of maintenance. Built to international standards like API 600 and BS 1414, these valves are a trusted component in critical piping systems worldwide, ensuring safe and efficient operation for your vessels and offshore platforms.
This valve series is designed for isolation service in pipelines carrying seawater, ballast, fuel oil, lubricating oil, and other fluids on ships, FPSOs, and drilling rigs. The parallel slide design is a key feature, utilizing two parallel discs that are forced against parallel seats by the upstream pressure. This mechanism provides a tight, bi-directional seal and minimizes wear on the seating surfaces, which is crucial for frequent operation cycles.
Core Technical Features & Advantages:
- Superior Sealing & Bi-Directional Flow: The parallel slide gate mechanism ensures reliable shut-off in both flow directions, a critical requirement for many marine systems where flow direction may change.
- Robust Construction for Marine Environment: Manufactured from premium cast steel (typically ASTM A216 WCB), the valve body offers high strength and excellent resistance to corrosion, especially when paired with appropriate coatings or material grades for seawater service.
- Reduced Seat Wear & Extended Service Life: Unlike wedge gate valves, the parallel discs slide without friction against the seats until the final closing moment. This design significantly reduces abrasive wear, leading to longer maintenance intervals and lower lifecycle costs.
- Easy Operation & Maintenance: The stem is designed with a rising or non-rising feature, and the gland packing is easily accessible for adjustment or replacement. A gear operator is available for larger sizes (DN150 and above) to reduce required operating torque.
- Flanged Connection for Secure Installation: Standard flanged ends (RF or FF) conform to ASME B16.5 or other international standards, ensuring a leak-proof connection to the pipeline and simplifying installation and replacement procedures.
Key Technical Specifications:
| Parameter | Specification |
|---|---|
| Size Range | DN50, DN65, DN80, DN100, DN125, DN150, DN200 (2" to 8") |
| Pressure Rating | PN1.6, PN2.5, PN4.0, PN6.3, PN10 (Class 150, 300) |
| Body Material | Cast Steel (WCB), Ductile Iron, Stainless Steel (optional) |
| Trim Material (Seat/Disc) | 13% Cr Stainless Steel, Stainless Steel 316, Hard-faced (Stellite) |
| Stem Material | Stainless Steel (410, 304, 316) |
| Packing | Graphite, PTFE, or Flexible Graphite for high-temp |
| Test Standards | Shell Test: 1.5 x PN; Seat Test: 1.1 x PN; API 598 |
| Operating Temperature | Standard: -29°C to +425°C (WCB). Low-temp versions available. |
Benefits for Your Marine Operations:
- Enhanced System Reliability: Minimizes the risk of leaks and valve failure in critical systems, contributing to overall vessel safety and operational uptime.
- Lower Total Cost of Ownership: The durable design and reduced wear parts translate into fewer replacements, less downtime for maintenance, and significant cost savings over the valve's lifespan.
- Global Compliance & Compatibility: Manufactured to widely recognized marine and industrial standards, ensuring acceptance by major classification societies and seamless integration into existing global fleets.
- Flexible Configuration: Available in various material grades, trim options, and with accessories like limit switches or by-pass valves to meet specific project requirements.
With over eight years of specialized manufacturing experience and a proven export record to key maritime regions including North America, Europe, Southeast Asia, and the Middle East, Shanghai Zhibang Valve has built a reputation for quality and reliability. Our ISO9001 certification underpins every stage of production, from material sourcing to final testing. Supported by efficient logistics from major ports like Shanghai and Guangzhou, we ensure timely delivery of valves that meet the rigorous demands of the global marine industry. Choose our Cast Steel Marine Parallel Slide Gate Valve for a balance of performance, durability, and value that protects your assets and streamlines your operations. Contact us today to discuss your specifications or request a detailed quotation.
Frequently Asked Questions (FAQ):
Q1: What is the main advantage of a parallel slide gate valve over a traditional wedge gate valve for marine use?
A1: The primary advantage is the bi-directional sealing capability and significantly reduced wear on the seat and disc surfaces. The parallel discs are not forced into tapered seats, minimizing friction during operation. This leads to longer service life and more reliable sealing in systems where flow direction may reverse, which is common in marine applications like ballast systems.
Q2: Can this valve be used for throttling or flow control?
A2: No, gate valves, including the parallel slide type, are designed primarily for isolation (fully open or fully closed). Using them for throttling can cause vibration, cavitation, and accelerated erosion of the disc and seats, leading to premature failure. For flow control, globe valves or control valves are recommended.
Q3: What material options are available for corrosive services like seawater?
A3> While the standard body is cast steel (WCB) with protective coatings, we offer upgraded materials for highly corrosive environments. This includes stainless steel (CF8/CF8M for 304/316) bodies or super duplex stainless steel. The trim (seat & disc) can be specified in 316 stainless steel or hard-faced with materials like Stellite for extra erosion resistance.
Q4: Is a gear operator necessary, and when is it required?
A4: A gear operator is recommended for valves DN150 (6") and larger, or for any valve where the operating pressure creates a high stem torque that makes manual operation difficult. The gearbox reduces the input force required, making the valve safer and easier for personnel to operate.
Q5: Are these valves suitable for high-temperature applications, such as steam lines?
A5: Yes, the standard cast steel (WCB) construction is suitable for temperatures up to 425°C. For the sealing, high-temperature flexible graphite packing is used instead of PTFE. It is crucial to specify the exact service temperature when ordering to ensure the correct material selection for all internal components.
Q6: What certifications or documentation do you provide with the valves?
A6> As an ISO9001-certified manufacturer, we provide a standard inspection report and material certificates (CMTR) for the body and critical parts. Valves can be tested and inspected according to API 598. Documentation required by specific classification societies (like ABS, DNV, LR, etc.) can be arranged upon request.
Q7: What is the lead time for an order of these valves?
A7: Lead time depends on the order quantity, size, and material specifications. Standard configurations in common sizes (DN50-DN200, WCB) typically have shorter lead times. We maintain a strategic inventory for some models. Please contact our sales team with your specific requirements for an accurate delivery schedule.
Q8: Do you offer customization, such as different flange standards or face-to-face dimensions?
A8: Yes, we offer a high degree of customization. We can manufacture valves to comply with various flange standards (ASME, DIN, JIS, etc.) and provide non-standard face-to-face dimensions as per customer drawings or specifications. Please provide your detailed requirements for a tailored solution.
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