Cast Iron Angle Safety Valve CB 304-92

Cast Iron Angle Safety Valve CB 304-92

Certificate: CCS, GL, BV certificate, etc.
Delivery Time: 15 days
Place of Origin: China
Packing Details: Export standard packaging.

Category:

CB 304-92 Cast Iron Angle Safety Valve

The CB 304-92 Cast Iron Angle Safety Valve is a heavy-duty, precision-engineered safety device specifically designed for critical shipbuilding and marine engineering applications where reliable overpressure protection is non-negotiable. Featuring a robust angle pattern configuration, this valve provides automatic pressure relief to safeguard piping systems, pressure vessels, and equipment from the dangers of excessive pressure.

Constructed with a durable cast iron body and cover, and fitted with corrosion-resistant bronze internals (aluminum bronze stem and cast tin bronze disc), this valve is ideally suited for installations where resistance to both internal and external corrosion is paramount. The 90-degree angle pattern design not only saves valuable space in cramped engine rooms but also simplifies piping layouts by naturally changing the flow direction.

Available in two primary configurations—Type B and Type BS—and in nominal diameters ranging from DN25 to DN80, this safety valve meets the stringent requirements of the Chinese Marine Standard CB 304-92. It is suitable for a wide range of media, including steam, air, and thermal fluids, across various pressure ranges from 0.1 MPa to 1.6 MPa.

Key Features & Benefits

  • ✅ Corrosion-Resistant Marine Construction: Combines a rugged cast iron body with an aluminum bronze stem and cast tin bronze disc, providing excellent resistance to corrosive marine environments.

  • ✅ CB 304-92 Standard Compliance: Manufactured in strict accordance with the Chinese national marine standard for safety valves, ensuring dimensional accuracy and reliable performance.

  • ✅ Angle Pattern (90°) Configuration: The angle design saves space, reduces the number of required fittings, and allows for easier installation in tight piping systems common on ships.

  • ✅ Heavy-Pattern Design: Specifically engineered for the heavy-duty demands of the shipbuilding industry, offering robust and long-lasting service.

  • ✅ Wide Pressure & Size Range: Suitable for pressure settings from 0.1~0.3 MPa up to 0.9~1.6 MPa and available in sizes DN25, DN32, DN40, DN50, DN65, and DN80.

  • ✅ Flanged Connections: Secure flanged ends ensure leak-free operation and easy bolting to mating flanges.

  • ✅ Versatile Applications: Ideal for protecting steam systems, boilers, compressed air lines, heating systems, and other pressurized equipment onboard.

  • ✅ Quality Assured: Subjected to strict quality control throughout the manufacturing process to guarantee operational safety and system integrity.

  • ✅ Custom Material Options: Upgraded materials are available upon request for applications requiring even higher levels of corrosion or temperature resistance.

Material Specifications

Component Standard Material
Body & Cover Cast Iron
Stem Aluminum Bronze
Disc Cast Tin Bronze
Optional Materials Upgraded materials (e.g., Stainless Steel, Nickel-Aluminum Bronze) available upon request.

Technical Specifications

Specification Detail
Design Standard CB 304-92
Valve Type Angle Safety Valve (Heavy Pattern)
Nominal Diameter (DN) 25, 32, 40, 50, 65, 80
Pressure Range (PN) 0.1 ~ 1.6 MPa (Sub-ranges: 0.1-0.3, >0.3-0.6, >0.6-0.9, >0.9-1.6)
Connection Type Flanged
Configuration Type B & Type BS (See dimensions below)

Dimensions – Type B (CB 304-92 Cast Iron Angle Safety Valve)

Dimensions in millimeters (mm).

DN PN (MPa) L H D D1 D2 d0 b n Th
25 0.1~0.3 174 80 105 73 56 13 14 4 M12
25 >0.3~0.6 174 80 105 73 56 13 14 4 M12
25 >0.6~0.9 174 80 105 73 56 13 14 4 M12
32 0.1~0.3 200 85 115 83 64 15 15 6 M14
32 >0.3~0.6 200 85 115 83 64 15 15 6 M14
32 >0.6~0.9 200 85 115 83 64 15 15 6 M14
40 0.1~0.3 210 90 125 93 74 15 16 6 M14
40 >0.3~0.6 210 90 125 93 74 15 16 6 M14
40 >0.6~0.9 210 90 125 93 74 15 16 6 M14
50 0.1~0.3 252 95 135 103 84 15 16 6 M14
50 >0.3~0.6 252 95 135 103 84 15 16 8 M14
50 >0.6~0.9 252 95 135 103 84 15 16 8 M14
50 >0.9~1.6 252 95 135 103 84 15 16 8 M14
65 0.1~0.3 316 115 155 123 104 15 15 8 M14
65 >0.3~0.6 316 115 155 123 104 15 15 8 M14
65 >0.6~0.9 316 115 155 123 104 15 15 8 M14
80 0.1~0.3 348 125 170 138 118 15 15 8 M14
80 >0.3~0.6 348 125 170 138 118 15 15 8 M14
80 >0.6~0.9 348 125 170 138 118 15 15 8 M14

Dimensions – Type BS (CB 304-92 Cast Iron Angle Safety Valve)

Dimensions in millimeters (mm).

DN PN (MPa) L H D D1 D2 d0 b n Th
25 0.1~0.3 174 100 115 85 68 14 6 4 M12
25 >0.3~0.6 174 100 115 85 68 14 6 4 M12
25 >0.6~0.9 174 100 115 85 68 14 6 4 M12
32 0.1~0.3 200 105 140 100 78 18 6 4 M16
32 >0.3~0.6 200 105 140 100 78 18 6 4 M16
32 >0.6~0.9 200 105 140 100 78 18 6 4 M16
40 0.1~0.3 210 115 150 110 88 18 7 4 M16
40 >0.3~0.6 210 115 150 110 88 18 7 4 M16
40 >0.6~0.9 210 115 150 110 88 18 7 4 M16
50 0.1~0.3 252 125 165 125 102 18 7 4 M16
50 >0.3~0.6 252 125 165 125 102 18 7 4 M16
50 >0.6~0.9 252 125 165 125 102 18 7 4 M16
50 >0.9~1.6 252 125 165 125 102 18 7 4 M16
65 0.1~0.3 316 145 185 145 122 18 8 4 M16
65 >0.3~0.6 316 145 185 145 122 18 8 4 M16
65 >0.6~0.9 316 145 185 145 122 18 8 4 M16
80 0.1~0.3 348 155 200 160 133 18 8 8 M16
80 >0.3~0.6 348 155 200 160 133 18 8 8 M16
80 >0.6~0.9 348 155 200 160 133 18 8 8 M16

Applications

The CB 304-92 Cast Iron Angle Safety Valve is trusted across a wide range of marine and industrial applications:

  • Steam Systems & Boilers: Provides essential overpressure protection for auxiliary and main steam boilers.

  • Compressed Air Systems: Safeguards starting air receivers and control air systems from over-pressurization.

  • Heating & Thermal Fluid Systems: Protects hot water heating systems and thermal oil heaters.

  • Shipbuilding & Vessel Construction: Standard equipment for new builds and retrofits across all vessel types.

  • Offshore Platform Safety Systems: Used in essential safety loops on platforms and rigs.

  • Industrial Process Equipment: Suitable for pressure vessels and reactors in industrial plants.

  • Power Generation Systems: Applied in marine and land-based power generation facilities.

  • Marine Engineering Applications: General overpressure protection in fuel, cooling, and other auxiliary systems.

Frequently Asked Questions (FAQ)

1. What is the difference between Type B and Type BS in the CB 304-92 standard?
The difference between Type B and Type BS lies primarily in the flange dimensions and facing.

  • Type B typically conforms to a standard flat-face flange pattern with specific drilling (bolt hole diameter ‘d0’ and number of holes ‘n’).

  • Type BS features a different flange dimension set (e.g., larger D, D1, and different bolt hole configurations) and often has a raised face or specific sealing surface requirements.
    It is crucial to check your system’s flange standard (e.g., GB, JIS, DIN) and match it to the correct type (B or BS) to ensure proper installation. Please refer to the dimension tables carefully or consult with our engineers.

2. Why are bronze internals important for a cast iron marine safety valve?
In a marine environment, corrosion is a primary threat to equipment longevity. While cast iron provides a strong, cost-effective body, it can be susceptible to certain types of corrosion. Using bronze internals (stem and disc) offers several advantages:

  • Corrosion Resistance: Bronze is highly resistant to corrosion from seawater, steam, and many chemicals.

  • Prevents Galling: Bronze against bronze or bronze against cast iron provides smooth operation and prevents the moving parts from seizing (galling), which is critical for a safety valve that must open reliably.

  • Galvanic Compatibility: When properly specified, these materials minimize the risk of galvanic corrosion when in contact with other piping materials.

3. How does an angle safety valve differ from a straight-through safety valve?
The primary difference is the flow path. A straight-through safety valve has an inlet and outlet that are aligned (180 degrees). An angle safety valve, like our CB 304-92 model, has an inlet and outlet at a 90-degree angle. This is advantageous in marine engine rooms because:

  • Space Saving: It allows the pipework to change direction at the valve, eliminating the need for a separate elbow fitting.

  • Simplified Piping: It reduces the number of joints and fittings, potentially reducing leak paths and installation time.

  • Better Drainage: The angle pattern can facilitate better drainage of condensate in some steam applications.

4. What does the pressure range (e.g., 0.1~0.3 MPa) mean for setting the valve?
Safety valves are typically adjustable within a range. The provided range (e.g., 0.1~0.3 MPa) indicates the span of pressures at which the valve can be set to open (its set pressure). When you order a valve, you must specify the exact pressure at which you need it to relieve. The valve will then be bench-tested and adjusted (or a specific spring will be fitted) to open precisely at that set point within the designated range. A valve ordered for the 0.1-0.3 MPa range cannot be adjusted to open at 0.8 MPa.

5. Can this valve be used for other media besides steam and air?
Yes, the CB 304-92 Cast Iron Angle Safety Valve is suitable for a variety of non-corrosive gases and liquids commonly found in marine systems. This includes thermal fluids, fresh water, and fuel oils (depending on temperature and specific gravity). However, it is crucial to verify the material compatibility of the cast iron body and bronze internals with the specific media and operating temperature. For aggressive chemicals or high-temperature applications, alternative materials like stainless steel may be required. Please consult with our technical sales team to confirm suitability for your specific application.

Attention please: The description was copied from different cooperating manufacturers. The description may be different with the goods, please check with us when order.

Tag: Our other products 
Click here to contact us via whatsapp

Related products

Scroll to Top