Mechanical pressure relief valve: This is a more common type. It works based on the mechanical structure principle of the spring and the valve disc. When the pressure inside the box reaches the preset opening pressure, the spring is compressed and the valve disc opens for exhaust. The mechanical pressure relief valve has a relatively simple structure and high reliability.

Intake control:
1. Electric regulating valve: By the signal sent from the intelligent control system, the opening of the valve is adjusted to control the flow and pressure of the protective gas entering the explosion-proof positive pressure box.
2. Pressure reducing valve: It is used to reduce the input high-pressure protective gas to the pressure range suitable for the operation of the explosion-proof positive pressure box, ensuring the stability and compliance of the intake pressure.

The explosion-proof positive pressure box forms a certain positive pressure environment inside the box by filling it with clean and dry protective gas (such as compressed air). When the pressure inside the box reaches the set value (usually within the range of 50 - 1000Pa), the positive pressure inside the box can prevent dangerous explosive gases, dust, etc. from the outside from entering the box.

Explosion-proof positive pressure box is an electrical equipment with explosion-proof function. Through the intelligent control system and pressure control system, it introduces clean and safe compressed air into the box to form a micro-positive pressure inside the box, preventing the entry of dangerous gases and dust from the outside, so as to achieve the purpose of explosion-proof.