English Views: 100 Author: DEYUAN 041 Publish Time: 2026-01-12 Origin: Site
Amid the vigorous development of the global marine transportation industry, the navigation safety of oil tankers and chemical tankers has always been the core focus of the industry. The pressure balance, fire and explosion prevention, and safe discharge of toxic vapors in cargo oil tanks are directly related to ship navigation safety, crew life protection, and the marine ecological environment. DEYUAN MARINE CO., LTD., deeply engaged in the field of marine safety equipment, launches the Marine High-Velocity Relief Valve (Pressure/Vacuum Valve), which strictly complies with international industry standards. With its stable and reliable performance, it has become a core supporting product for the ventilation systems of oil tankers and chemical tankers, building a solid safety barrier for the marine transportation industry.
The dimension parameter of the DF high-velocity relief valve
| Serial No | DN | D1 | D | L | H | n-d |
| 8 | 250 | 350 | 395 | 460 | 860 | 12-φ22 |
| 7 | 200 | 295 | 340 | 460 | 860 | 8-φ22 |
| 6 | 150 | 225 | 265 | 390 | 680 | 8-φ18 |
| 5 | 125 | 200 | 240 | 340 | 665 | 8-φ18 |
| 4 | 100 | 170 | 210 | 290 | 565 | 4-φ18 |
| 3 | 80 | 150 | 190 | 290 | 545 | 4-φ18 |
| 2 | 65 | 130 | 160 | 250 | 490 | 4-φ14 |
| 1 | 50 | 110 | 140 | 250 | 490 | 4-φ14 |
Remarks: flange executive standards:GB2501-89,DN50-DN150,nominal pressure is 0.6MPa,DN200、DN250,nominal pressure is 1.6MPa.
Core Product Advantages
1. Outstanding Safety Performance, Comprehensive Risk Mitigation
This series of high-velocity relief valves precisely control the pressure balance of cargo oil tanks. When the pressure inside the tank reaches the set opening value (Normally14kPa for conventional oil tankers and 20kPa for chemical tankers), the valve opens automatically, discharging compressed mixed gas at a high speed exceeding 30m/s. During unloading, a vacuum is formed inside the tank, and when it reaches a certain set value, air enters smoothly through the flame screen, effectively preventing cargo oil tank deformation due to overpressure or collapse due to underpressure. The valve is equipped with a double-layer flame screen made of 316L material, which strictly blocks flames from entering the cargo oil tank, minimizes fire and explosion risks at the source, and avoids leakage of toxic cargo vapors, protecting both personnel safety and the marine environment.
2. Excellent Structural Design, Stable and Disturbance-Free Operation
Adopting an innovative sealing structure design, the valve is in a tight-fitting sealed state when closed, completely solving the common chattering problem of traditional valves. It ensures no leakage of mixed gas inside the tank during the ship's navigation, making it an optimal choice especially for the transportation of oil and volatile chemicals. The valve stem rises and falls smoothly with the system pressure, operating like a pneumatic component without full-lift impact even under the maximum allowable working pressure of the system. It runs stably throughout the pressure rise and fall process, reducing component wear and extending the product service life. Core components are made of high-quality materials such as 304 stainless steel and 316L stainless steel, featuring corrosion resistance and wear resistance to adapt to harsh marine working conditions.
3. Wide Application Scope, Flexible and Convenient Selection
The product offers a complete range of specifications, including various nominal diameters from DN50 to DN250, covering pure gravity type, gravity plus magnetic type, and models with heating devices and gas-freeing covers, to meet the personalized needs of different ships and transportation media. For the transportation of special goods such as propylene oxide, the dedicated DF-ISO-60 type high-velocity relief valve provides a customized solution, forming complementary insurance with valves suitable for ordinary chemical transportation. All models support standardized flange connection, and installation can be completed only by bolting the flange of each valve to the matching flange of the corresponding cargo oil tank vent pipe. Disassembly, cleaning, and maintenance are convenient and efficient, significantly reducing ship operation and maintenance costs.
4. Compliance with International Standards, Full Quality Control
The product is strictly designed, manufactured, and tested in accordance with international rules and circulars such as ISO 15364 "Ships and Marine Technology - Pressure/Vacuum Valves for Cargo Tanks", IMO MSC/Circ.677, and MSC/Circ.1009. Each product undergoes a full range of inspections including simulated cabin loading and unloading tests, pressure operation tests, corrosion resistance and anti-freezing tests, with a detailed test report attached to ensure 100% qualification of delivered products. The product is compatible with supporting equipment such as marine nitrogen systems and various ship ventilation system designs, holding authoritative classification society certifications. Its quality and performance have been widely recognized by global shipowners and ship design institutes.
DEYUAN MARINE has always adhered to the mission of "safeguarding marine transportation safety", focusing on the performance optimization and quality improvement of marine safety equipment. With its core advantages of safety, reliability, stability, and efficiency, the Marine High-Velocity Relief Valve has become a trusted choice in the global marine transportation field. In the future, DEYUAN MARINE will continue to deepen its presence in the segmented market, providing products and services more in line with industry needs to contribute to the safe, green, and efficient development of the global marine transportation industry. For product details or cooperation inquiries, please feel free to contact us. We will provide you with professional solutions.
