Ekgas, here’s a clear and simple explanation of a Relief Valve suitable for technical use:

What Is a Relief Valve?

A relief valve is a safety device used in gas, steam, liquid, and hydraulic systems to protect equipment from overpressure. When the system pressure rises above a preset limit, the relief valve automatically opens to release excess pressure, preventing equipment damage, leakage, or explosion. Once the pressure drops back to a safe level, the valve closes again.

Key Functions of a Relief Valve
✔ 1. Overpressure Protection

Its main job is to keep the system within a safe pressure range.

✔ 2. Prevents Equipment Damage

Protects pipelines, regulators, pumps, tanks, burners, and other pressure-sensitive devices.

✔ 3. Ensures System Safety & Stability

Avoids hazardous failures caused by pressure buildup.

✔ 4. Automatically Resets

Closes again when pressure returns to normal.

How a Relief Valve Works (Simple Explanation)

The valve is set to a preset pressure.

When system pressure exceeds this limit, the force pushes the valve open.

Excess gas or liquid is released.

After pressure decreases, a spring returns the valve to the closed position.

Where Relief Valves Are Commonly Used

Gas pipelines

Industrial burners and boilers

Compressors

Pumps

Heat exchangers

Oil & gas systems

Chemical plants

Types of Relief Valves
Type Description
Pressure Relief Valve (PRV) Opens when system pressure exceeds the set value.
Safety Relief Valve (SRV) For both liquid and gas; opens rapidly for safety.
Thermal Relief Valve (TRV) Protects against thermal expansion in pipelines.
Pilot-Operated Relief Valve Accurate and stable pressure control in high-pressure systems.
Why Relief Valves Are Important

Prevents explosion risks

Protects expensive industrial equipment

Ensures compliance with safety standards

Reduces downtime and maintenance costs