Marine-Grade Cast Iron JIS Valve
Engineered for reliability in the world’s most demanding maritime environments, our marine-grade cast iron JIS valve delivers exceptional performance and longevity for critical shipboard systems. Manufactured in strict compliance with Japanese Industrial Standards (JIS) , these robust valves are the preferred choice for engineers and shipbuilders requiring dependable fluid control in seawater, ballast, and fuel oil applications.
Designed to withstand the corrosive effects of saltwater and the high-pressure demands of modern vessel operations, our cast iron marine valves offer superior corrosion resistance, high-pressure capability, and reliable operation. Whether used in new shipbuilding projects, during vessel repair and maintenance, or as part of offshore platform operations, these valves provide the durability and strength required for long-term service.
Key Features & Benefits:
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✔ JIS Compliant Design: Manufactured to strict Japanese Industrial Standards (JIS) , ensuring dimensional accuracy, interchangeability, and reliable performance.
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✔ Marine-Grade Construction: Robust cast iron GG-25 body and bonnet provide excellent strength and vibration damping.
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✔ Corrosion-Resistant Trim: Critical internal components (seat, disc, stem) are made from SUS316 stainless steel for superior resistance to seawater and aggressive media.
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✔ Versatile Applications: Ideal for seawater cooling systems, ballast systems, fuel oil lines, and other general marine piping applications.
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✔ 3.1 Mill Certification: Supplied with full material traceability and certification for quality assurance.
Material Specification
Our valves are constructed with a durable cast iron body and corrosion-resistant stainless steel trim, ensuring longevity in harsh marine conditions.
| Component | Material | Properties |
|---|---|---|
| BODY | GG-25 | High-quality gray cast iron, excellent strength |
| BONNET | GG-25 | Durable gray cast iron construction |
| SEAT | SUS316 | Austenitic stainless steel, superior corrosion resistance |
| DISC | SUS316 | High-strength stainless steel for reliable sealing |
| STEM | SUS316 | Corrosion-resistant stainless steel for smooth operation |
Technical Specification
| Parameter | Specification |
|---|---|
| MODEL | JIS F7306 – STOP TYPE (Straight-through pattern) |
| JIS F7354 – SDNR TYPE (Screwed-down, non-return pattern) | |
| CONNECTION | JIS 5K Flange |
| CERTIFICATION | 3.1 MILL CERTIFICATE (EN 10204 3.1) – Full material traceability |
Dimension Table
Select the correct valve size for your piping system from our comprehensive range of JIS 5K flanged valves. All dimensions are in millimeters (mm) and weight in kilograms (kg).
| CODE STOP | CODE SDNR | DN | L (Face to Face) | D (F.O.D) | C (P.C.D) | NO (Number of Holes) | h (Hole Dia.) | W (Weight kg) |
|---|---|---|---|---|---|---|---|---|
| 750216 | 751116 | 50 | 100 | 130 | 105 | 4 | 15 | 13.0 |
| 750217 | 751117 | 65 | 115 | 155 | 130 | 4 | 15 | 18.2 |
| 750218 | 751118 | 80 | 130 | 180 | 145 | 4 | 19 | 23.3 |
| 750219 | 751119 | 100 | 150 | 200 | 165 | 8 | 19 | 33.5 |
| 750220 | 751120 | 125 | 170 | 235 | 200 | 8 | 19 | 46.5 |
| 750221 | 751121 | 150 | 190 | 265 | 230 | 8 | 19 | 64.0 |
| 750222 | 751122 | 200 | 220 | 320 | 280 | 8 | 23 | 104.0 |
| 750223 | 751123 | 250 | 275 | 385 | 345 | 12 | 23 | 175.0 |
| 750224 | 751124 | 300 | 310 | 430 | 390 | 12 | 23 | 243.0 |
| 750225 | 751125 | 350 | 360 | 480 | 435 | 12 | 25 | 336.0 |
| 750226 | 751126 | 400 | 395 | 540 | 495 | 16 | 25 | 455.0 |
Frequently Asked Questions (FAQs)
Q1: What is the difference between JIS F7306 (STOP) and JIS F7354 (SDNR) valves?
A: The JIS F7306 STOP TYPE is a standard manual isolation valve used to start or stop the flow of fluid. The JIS F7354 SDNR TYPE (Screw-Down Non-Return) combines the functions of an isolation valve and a check valve. It can be manually closed to stop flow, but when left open, it automatically prevents reverse flow, making it ideal for applications like boiler outlets or pump discharges where backflow prevention is required.
Q2: What does JIS 5K flange rating mean?
A: JIS 5K is a flange pressure rating defined by Japanese Industrial Standards. It indicates the flange’s pressure-temperature capability. A “5K” rating is suitable for low to medium pressure applications commonly found in marine auxiliary systems such as cooling water, ballast, and low-pressure fuel oil lines. The “5K” dimension standard ensures the valve face-to-face length, flange diameter, and bolt hole patterns are correct for mating with standard JIS 5K pipe flanges.
Q3: Why is SUS316 stainless steel used for the seat, disc, and stem?
A: The trim components (seat, disc, stem) are made from SUS316 stainless steel because it offers superior corrosion resistance, particularly against seawater and chloride-bearing environments. This is critical for ensuring the valve remains operational and leak-tight over many years of service in a marine setting. Using SUS316 for these moving and sealing parts significantly enhances the valve’s durability compared to valves with carbon steel or lower-grade trim.
Q4: What is a 3.1 MILL CERTIFICATE, and why is it important?
A: A 3.1 MILL CERTIFICATE (in accordance with EN 10204) is an inspection document that certifies the chemical and mechanical properties of the materials used in the valve’s construction. It provides full traceability from the raw material to the finished product. This certification is often a mandatory requirement for materials used in classed vessels and offshore installations, as it provides documented proof that the components meet the specified material grades (like GG-25 and SUS316).
Q5: Can these cast iron JIS valves be used for seawater service?
A: Yes, these valves are specifically designed for marine applications, including seawater service. While the cast iron body (GG-25) offers good corrosion resistance in seawater, the critical factor is the SUS316 stainless steel trim, which provides excellent resistance to pitting and crevice corrosion in chloride-rich environments. For optimal long-term performance in permanent seawater immersion, proper system maintenance and cathodic protection are also recommended.
Q6: Are these valves suitable for use on ships classed by ABS, DNV, or other classification societies?
A: Yes, these valves are manufactured to JIS standards, which are widely accepted by all major classification societies, including ABS, DNV, BV, LR, CCS, NK, and KR. We can supply the valves with the necessary certification (including the 3.1 material certificate) to satisfy class surveyors during shipbuilding or repair inspections. Please specify your classification requirements when ordering.
Attention please: The description was copied from different cooperating manufacturers. The description may be different with the goods, please check with us when order.
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