Products
Complete marine engine safety valve solutions
ZRI Series - Explosion Relief Valve for Intake Manifold of DF Engine
The ZRI Series is an explosion relief valve installed on the intake manifold of dual-fuel (DF) engines. It protects engine integrity by rapidly releasing abnormal pressure buildup, featuring optimized design based on CFD and structural analysis for high reliability.
Related Certifications
Features
Applications
- MAN B&W and WinGD DF engine intake manifolds
- Dual-fuel engine systems on LNG-fueled vessels
- Main engines of container ships, LNG carriers, RoRo vessels
- Onshore power plants and offshore platform DF generator engines
Technical Details
The ZRI Series is a dedicated relief valve designed to handle explosive pressure surges that can occur in the intake manifold of dual-fuel (DF) engines during gas mode operation.
DF engines use both LNG (natural gas) and heavy fuel oil. If unburned gas accumulates in the gas fuel intake system, there is a risk of explosion. The ZRI Series addresses this risk with an opening pressure precisely adjustable between 3.5 and 6.3 bar, operating reliably at temperatures between 40 and 60°C.
Through CFD (Computational Fluid Dynamics) and structural analysis, the optimized flow path minimizes the impact on internal components during pressure release and improves repeated operation reliability. Five models from ZRI-98 to ZRI-266 accommodate various intake manifold bore diameters.
Model Lineup
| Model | Outflow Area(cm²) | Ød1(mm) | Ød2(mm) | ØD(mm) | H(mm) | Mounting Bolt | Weight(kg) |
|---|---|---|---|---|---|---|---|
| ZRI-98 | 75 | 98 | 138 | 210 | 230 | 4-M12 | 18 |
| ZRI-122 | 117 | 122 | 165 | 240 | 260 | 6-M12 | 25 |
| ZRI-173 | 235 | 173 | 225 | 305 | 320 | 6-M16 | 42 |
| ZRI-224 | 394 | 224 | 280 | 365 | 390 | 8-M16 | 68 |
| ZRI-266 | 555 | 266 | 335 | 420 | 450 | 8-M16 | 95 |
Frequently Asked Questions
ZIC products hold type approval from 11 international classification societies.