In industrial zones and refineries, the safety of storage tank systems is always the top priority. A sudden pressure surge caused by fire can lead to catastrophic explosions. This is where the Nacional Emergency Relief Valve acts as the "last line of defense."

In Vietnam, Phuc Minh Engineering Co., Ltd is proud to be the strategic partner providing this high-end industrial valve line, helping businesses solve the toughest safety challenges.

I. What is the Nacional Emergency Relief Valve?

The Emergency Relief Valve (also known as the Emergency Vent) is a passive safety device installed on the roofs of petroleum, chemical, or liquid gas storage tanks.

The Nacional line is manufactured by Válvulas Nacional, S.A. – a prestigious brand from Spain (established in 1976). Unlike standard breather valves that only handle daily pressure changes due to temperature, Nacional emergency valves are designed to release a massive amount of gas in a short time during dangerous incidents, especially when the tank is heated by an external fire.

II. Working Principle of Nacional Emergency Relief Valve

Understanding the working principle helps operators trust this solution. The valve operates completely automatically based on pressure differential, without requiring electricity or remote pneumatic control.

1. Normal State (Closed)

Under standard operating conditions, the valve cover (pallet) is held tightly against the valve seat by its own weight or spring force. The valve ensures absolute tightness to prevent evaporation loss of fuel/chemicals into the environment.

2. Emergency State (Open)

When a fire surrounds the tank, the high temperature causes the internal vapor pressure to spike. When this pressure exceeds the valve's Set Pressure:

• The gas force overcomes the gravity/spring force holding the pallet.

• The valve cover opens fully, creating a massive outlet for gas to escape.

• This process immediately reduces internal tank pressure, preventing Tank Rupture.

3. Reseating (Auto-close)

Once the tank pressure drops below the safe set level, gravity pulls the cover back down to close the valve, continuing to protect the remaining fuel inside.

III. Why use Nacional Valves for your factory?

Among numerous industrial valve brands, Nacional remains the #1 choice for EPC contractors and major investors due to outstanding advantages:

1. European Origin - International Standards

Manufactured 100% in Spain, strictly complying with fire safety standards such as API 2000, ASME, and the European Pressure Equipment Directive PED 2014/68/EU. This ensures the valve operates with absolute precision when incidents occur.

2. Durable Materials for Harsh Environments

Nacional valves are typically made from Carbon Steel (WCB), Stainless Steel (Inox 304/316), or Cast Aluminum. Notably, the seal and gasket materials are designed to withstand chemical corrosion and petroleum vapors, ensuring long service life without frequent maintenance.

3. High Flow Capacity

Nacional's design optimizes flow capacity. In fire scenarios, its rapid relief capability is far superior to standard spring valves, providing absolute tank protection.

IV. Phuc Minh Engineering Co., Ltd – Trusted Distribution Partner

Choosing the supplier is as important as choosing the brand. Phuc Minh Engineering Co., Ltd is not just a trading unit, but a comprehensive technical solution provider.

Benefits of buying Nacional valves at Phuc Minh:

• Genuine Products: Full original CO/CQ documents from Spain.

• In-depth Technical Consultation: Phuc Minh’s engineering team calculates valve sizing based on tank capacity and fluid type, ensuring compliance with API standards.

• Diverse Product Range: Besides Nacional, Phuc Minh also provides accompanying equipment such as KSPC Breather Valves, Flame Arresters, Pressure Reducing Valves... creating a synchronized safety system.

V. Conclusion

Don't wait for an accident to worry about safety. Equipping Nacional Emergency Relief Valves is a smart investment to protect assets and human lives in industrial zones. With Phuc Minh Engineering Co., Ltd, you get European-standard safety solutions right here in Vietnam.

Contact us today for consultation and a detailed quotation for your system!

Frequently Asked Questions (FAQ)

1. How is an Emergency Relief Valve different from a Breather Valve? A Breather Valve balances small pressures arising from pumping or day/night temperature changes. An Emergency Relief Valve only operates during major incidents (like fire) causing sudden overpressure that a breather valve cannot vent in time.

2. How to choose the Set Pressure for a Nacional valve? The set pressure must be lower than the tank's design pressure but higher than the normal operating pressure. Phuc Minh engineers will help you calculate this figure based on API 2000 standards.

3. Can Nacional valves be used for corrosive chemical tanks? Yes. Nacional offers premium material options like Stainless Steel 316 or anti-corrosion coatings (Teflon/PTFE) for special chemical environments.

4. Does Phuc Minh Company support installation and maintenance? Phuc Minh Engineering Co., Ltd provides installation consulting, operation guidance, and support for maintenance and genuine part replacement for customers.