High velocity P/V relief valve

1. Product Overview

The High Velocity Pressure/Vacuum Valve (P/V Valve) is a mandatory safety device in the maritime industry. Unlike conventional breather valves, the high-velocity type is specially designed to automatically control pressure differences and release toxic gases at extremely high speeds (over 30 m/s). This equipment is used to protect tanks and cargo holds containing liquid cargo (such as oil tankers and chemical carriers) from deformation caused by overpressure or vacuum.

2. Detailed Technical Specifications

Shipowners and marine engineers usually focus on classification-approved parameters such as:

3. Construction and Key Features

To convince shipowners and shipyards, highlight these superior technical features:

• Integrated Flame Screen: Prevents external flames from flashing back into the cargo hold, eliminating fire/explosion risks.
• Anti-icing / Non-oscillating Design: Optimized valve disc ensures smooth operation even under harsh marine weather, preventing sticking due to salt or ice.
• High-velocity Vertical Discharge: Expels hydrocarbon vapors or toxic chemicals straight upward, avoiding dangerous gas accumulation on the deck where crew members work.
• Fully Automatic Operation: Works on the principle of disc weight and spring force, opening/closing precisely according to actual tank pressure without requiring electricity or compressed air.

4. Why Customers Should Choose This Valve

💡 Advice for Customers Cargo tank systems on ships face extreme risks of deformation during high-speed loading/discharging or sudden temperature changes. Using internationally certified high-velocity P/V valves is mandatory to protect both the vessel’s structure and crew safety, and is a prerequisite for classification approval to sail.

🌟 Outstanding Advantages

• Absolute Safety: Certified by the strictest international classification societies (DNV, BV, NK, KR, VR…), ensuring explosion-proof protection of cargo tanks.
• Long Service Life in Marine Environments: Premium SUS316L material resists severe seawater and chemical vapor corrosion.
• Easy Visual Inspection: Modern valves are equipped with a check-lift lever, allowing crew to manually test valve disc operation during routine safety checks before voyages.

5. Common Applications

• Oil Tankers: Installed on venting systems of crude oil or petroleum product tanks.
• Chemical Tankers: Protects cargo holds containing volatile and highly corrosive liquid chemicals.
• FPSOs and Barges: Used in floating storage units and barges for crude oil and petroleum products in both domestic and international operations.