5K JIS Marine Valves
The Marine Cast Iron Screw Down Check Globe Valve is a versatile and essential stop check valve widely used in critical marine piping systems. Commonly referred to as a Marine Cast Iron SDNR valve (Screw-Down Non-Return), this valve combines the functions of both a stop valve and a check valve into a single, reliable unit. It is specifically designed to shut off or turn on the flow of media, adjust the flow rate, and crucially, prevent medium backflow in a variety of shipboard applications.
Engineered for durability and performance, this valve is ideal for use in marine steam, air, fuel oil, lubrication oil, fresh water, and water feeding lines. Its robust cast iron construction and precision-machined internal components ensure long-term reliability in the demanding conditions of a marine engine room or deck piping system.
Key Features & Benefits:
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✔ Dual Functionality: Combines isolation and non-return capabilities in a single valve body, saving space and reducing the number of fittings in the pipeline.
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✔ Versatile Application: Suitable for a wide range of media, including steam, oil, gas, air, and water.
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✔ JIS Compliant: Manufactured to stringent Japanese Industrial Standards (JIS) for guaranteed quality and interchangeability.
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✔ Robust Construction: Durable cast iron body with corrosion-resistant trim options (Bronze or Stainless Steel).
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✔ Reliable Backflow Prevention: The screw-down non-return design automatically prevents reverse flow, protecting equipment like pumps and boilers.
Technical Specification
| Parameter | Specification |
|---|---|
| Design & Manufacturing Standard | JIS F7353 |
| Inspection and Test Standard | JIS F7400 |
| Suitable Medium | Steam, Oil, Gas, Air, Water, etc. |
| Flange Standard | JIS B2220 5K FF (Flat Face) |
Max Working Pressure
The maximum working pressure varies depending on the fluid, temperature, and valve size. Refer to the table below for detailed ratings.
| Fluid Condition | Max Working Pressure (Mpa) | ||
|---|---|---|---|
| DN200 or less | DN250,DN300 | DN350,DN400 | |
| Class B / Class S | Class B | Class B | |
| Steam of 230℃ or less | – / 0.5 | – | – |
| Steam of 205℃ or less | 0.5 / 0.5 | – | – |
| Air and gas | 0.5 / 0.5 | 0.5 | – |
| Oil and pulsation water | 0.5 / 0.5 | 0.5 | 0.3 |
| Non-shock water of 120℃ or less | 0.7 / 0.7 | 0.7 | 0.6 |
Hydraulic Test Pressure
| Nominal Size (DN) | Test Pressure (Mpa) | |
|---|---|---|
| Watertight for Valve Seat | Watertight for Valve Body | |
| 300 or less | 0.77 ~ 0.44 | 1.05 |
| 350 & 400 | 0.66 ~ 0.3 | 0.9 |
Main Material Options
We offer two material classes to suit different media and operational requirements:
| Component | Class B Material | Class S Material |
|---|---|---|
| Body/Bonnet | Cast Iron | Cast Iron |
| Seat | Bronze | Stainless Steel (SUS) |
| Disc | Bronze | Stainless Steel (SUS) |
| Stem | Brass | Stainless Steel (SUS) |
Main Dimensions & Weights (JIS 5K)
Below are the key dimensions for our range of cast iron SDNR valves. All dimensions are in millimeters (mm) and weight in kilograms (kg).
| IMPA Code | Size (DN) | L | Flange diam. (D) | Pitch (C) | No of Bolt Hole | h (Bolt Hole Dia.) | t | H | D2 | Weight (kg) |
|---|---|---|---|---|---|---|---|---|---|---|
| 751101 | 50 | 210 | 130 | 105 | 4 | 15 | 16 | 270 | 160 | 14.8 |
| 751102 | 65 | 250 | 155 | 130 | 4 | 15 | 18 | 300 | 180 | 21.3 |
| 751103 | 80 | 280 | 180 | 145 | 4 | 19 | 18 | 310 | 180 | 27.6 |
| 751104 | 100 | 340 | 200 | 165 | 8 | 19 | 20 | 360 | 224 | 40.4 |
| 751105 | 125 | 410 | 235 | 200 | 8 | 19 | 20 | 390 | 250 | 57.9 |
| 751106 | 150 | 480 | 265 | 230 | 8 | 19 | 22 | 445 | 280 | 80.9 |
| 751107 | 200 | 570 | 320 | 280 | 8 | 23 | 24 | 530 | 315 | 139 |
| 751108 | 250 | 740 | 385 | 345 | 12 | 23 | 26 | 650 | 355 | 243 |
| 751109 | 300 | 840 | 430 | 390 | 12 | 23 | 28 | 740 | 400 | 377 |
| 751110 | 350 | 840 | 480 | 435 | 12 | 25 | 30 | 840 | 500 | 463 |
| 751111 | 400 | 1050 | 540 | 495 | 16 | 25 | 30 | 940 | 630 | 643 |
Frequently Asked Questions (FAQs)
Q1: What does “SDNR” stand for, and what is its function?
A: SDNR stands for Screw-Down Non-Return. This describes the valve’s dual function. “Screw-Down” means it can be manually closed (like a globe valve) to isolate or regulate flow. “Non-Return” means that even when left open, it automatically acts as a check valve, preventing the reverse flow of media. This combination is crucial for protecting equipment like boilers and pumps from damage caused by backflow.
Q2: What is the difference between Class B and Class S material trim?
A: The difference lies in the materials used for the internal trim (seat, disc, and stem). Class B uses Bronze for the seat and disc and Brass for the stem. This is a standard, cost-effective option suitable for many applications. Class S uses Stainless Steel (SUS) for the seat, disc, and stem, offering superior corrosion resistance. Class S is typically recommended for more demanding media or environments, such as higher temperature steam or where enhanced durability is required.
Q3: 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. The “5K” designation ensures the valve’s flange dimensions (diameter, bolt hole pattern, face-to-face length) conform to the JIS B2220 standard, making it interchangeable with other JIS 5K components.
Q4: What media can this cast iron SDNR valve handle?
A: This valve is designed to handle a wide variety of media commonly found on ships, including steam, air, fuel oil, lubrication oil, fresh water, and cooling water. It is important to select the correct material class (Class B or Class S) based on the corrosiveness and temperature of the specific media to ensure long-term, reliable performance.
Q5: Can this valve be used on a boiler feed water line?
A: Yes, the Screw-Down Non-Return valve is the standard choice for boiler feed water lines. Its dual function is ideal for this application: the manual screw-down feature allows for regulation and isolation of feed flow, while the integral non-return function prevents the dangerous backflow of water from the boiler into the feed line in case of pressure loss or pump failure.
Q6: What is the maximum working pressure for the DN400 size with oil service?
A: According to the Max Working Pressure table, for a DN400 valve (Class B) used with oil and pulsation water, the maximum working pressure is 0.3 Mpa. It is crucial to consult these pressure-temperature ratings for the specific size and fluid condition to ensure the valve is not used beyond its design limits. For non-shock water at lower temperatures (120℃ or less), the rating for DN400 increases to 0.6 Mpa.
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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