The breathing valve is an important safety accessory on the pressure vessel, and although its structure and working principle are simple, they play a pivotal role in chemical production. This article will introduce the structural characteristics, working principle and application scenarios of breathing valves in detail.
First, the structure of the breathing valve.
The breathing valve is mainly composed of a valve body, a valve seat, a valve disc, a valve stem and a spring. The valve body is the body of the breathing valve and is usually made of cast steel or stainless steel materials for sufficient strength and corrosion resistance. The valve seat is the inlet and outlet channel of the valve body, which is usually made of stainless steel or copper material and has good sealing performance. The disc is the part that controls the inflow and exit of gases into and out of the valve seat, and is usually made of stainless steel or PTFE material, which has good sliding properties and corrosion resistance. The stem is the part that connects the disc to the spring, usually made of stainless steel or copper material, which has sufficient strength and corrosion resistance. The spring is the part that controls the opening and closing of the disc and is usually made of stainless steel or carbon steel material, which has some elasticity and corrosion resistance.
Second, the working principle of the breathing valve.
The working principle of the breathing valve is based on the balance between the pressure of the gas and the reaction force of the spring. When the pressure in the pressure vessel exceeds the preset pressure, the gas pressure will push the valve disc to move upward, causing the valve to open and the gas in the vessel to be discharged. When the pressure inside the pressure vessel is lower than the preset pressure, the reaction force of the spring causes the disc to move downward, causing the valve to close and prevent the outside gas from entering the vessel. In this way, the breathing valve can maintain a constant pressure inside the pressure vessel, ensuring the safe operation of the vessel.
Third, the application of breathing valves.
Breathing valves are widely used in petroleum, chemical, pharmaceutical, food and other industrial fields. In these areas, many devices need to operate under a certain pressure, and breathing valves are an important component to ensure the safe operation of these equipment. For example, in the petroleum industry, oil storage tanks need breathing valves to keep the pressure in the tank stable and prevent the tank from rupturing or deforming; In chemical production, the reactor needs a breathing valve to control the inflow and exit of gases during the reaction; In the pharmaceutical and food industries, tanks and packaging containers also require breathing valves to maintain a stable pressure and gas composition.
In addition, breathing valves can be used in gas transmission pipelines and storage equipment to control pressure fluctuations in pipelines and equipment. For example, in liquefied gas pipelines, breathing valves can prevent the pressure inside the pipeline from being too high or too low; In compressed air storage equipment, breathing valves control the intake and exhaust air of the equipment and keep the pressure stable.
In conclusion, breathing valves play an important role in many industrial fields as an important safety accessory. Understanding the structure, working principle and application scenarios of breathing valves can help to better ensure the safety and stability of industrial production.