A brief analysis of the working principle and characteristics of Pressure Relief Valve

The Pressure Relief Valve is a safety protection valve. Its opening and closing parts are usually closed under the influence of external force. When the pressure of the medium in the equipment or pipeline rises and exceeds the specified value, the medium will automatically open. Prevent the pressure of the medium in the pipeline or equipment from exceeding the specified value by discharging the medium to the outside of the system. Universal Valve are used in natural gas, petroleum gas and chemical Pressure Vessel equipment as well as industrial pipelines. It has outstanding advantages such as fire protection, explosion-proof, anti-static, reliable sealing, quick opening and closing, and large exhaust volume. Analysis of the working principle and structural characteristics of the Pressure Relief Valve Structural characteristics of the Pressure Relief Valve The Pressure Relief Valve consists of a main valve, a Pressure Relief Valve, a relief valve, joints and conduits. Under normal operating conditions, the system's medium pressure operates both below and above the main valve disc. Since the medium effect area of the air chamber above the main valve disc is smaller than the effect area of the lower medium, the main valve disc is in a closed state under the effect of the pressure difference. As the medium pressure in the pipeline increases, the specific pressure of the seal obtained by the seal will also increase, which is contrary to the Universal Valve, that is, the higher the medium pressure, the more reliable the seal. When the pressure of the pipeline medium is abnormal and reaches or exceeds the set pressure, the upper valve disc of the Pressure Relief Valve will quickly open. The medium in the air chamber above the main valve disc is quickly discharged through the exhaust joint of the Pressure Relief Valve, and the main valve disc is below the medium. Under the strong effect of pressure, it opens instantly, the medium is quickly discharged from the main valve outlet, and the medium pressure in the pipeline returns to normal operating pressure, ensuring system safety. When the pressure of the pipeline medium drops to about 90% of the set pressure of the Pressure Relief Valve set by the system, the valve disc on the Pressure Relief Valve closes, and the pipeline medium enters the air chamber above the main valve disc through the Control Valve.

Safety: Under the effect of pressure difference, the main valve is closed to ensure the normal operation of the system. Working Principle of Pressure Relief Valve The Pressure Relief Valve consists of a valve body, a lower valve disc, an ejection rod, a bleed joint, an upper valve disc, a spring and a relief valve. Under normal operating conditions, the upper disc of the Pressure Relief Valve is closed, and the lower disc of the Pressure Relief Valve is open. The pipeline medium enters the air chamber above the main valve disc through the lower valve disc, and then closes the main valve disc. When the pressure of the pipeline medium is abnormal and reaches or exceeds the set setting force, the lower disc of the Pressure Relief Valve closes under the effect of the medium pressure, cutting off the passage of the pipeline medium from entering the main valve disc, and the upper disc of the pilot valve is closed. Push the ejector rod forward. When the pilot valve opens, the medium in the air chamber above the main valve disc is quickly discharged through the exhaust joint. Under the strong effect of the following medium pressure, the main valve disc opens instantly and quickly. When the pipeline pressure drops to about 90% of the system set pressure, the upper disc of the Pressure Relief Valve is closed by the spring, and the upper disc of the Pressure Relief Valve is closed by the spring. The lower valve disc is opened by the ejection rod, and the pipeline medium enters the main valve through the lower valve disc. In the air chamber above the valve disc, the main valve disc is closed under the effect of pressure difference, thus ensuring the normal operation of the system. When you find that the medium pressure in the pipeline is abnormal and the Pressure Relief Valve cannot be opened, you can manually open the Pressure Relief Valve on the Pressure Relief Valve to release the medium in the air chamber above the main valve disc to open the valve cover. The main valve disc and releases the abnormal pressure of the medium in the pipeline to ensure system safety.
The discharge calculation theory of the Pressure Relief Valve was discussed and analyzed, and the factors affecting the discharge coefficient of the Pressure Relief Valve were discussed. At the same time, an air displacement test was carried out on the Pressure Relief Valve prototype. Displacement coefficient of Pressure Relief Valve Correct calculation of Pressure Relief Valve displacement is an important basis for rational selection of Pressure Relief Valve. The preliminary design of the new Pressure Relief Valve was completed using traditional mechanical design methods and system reliability design, reliability distribution research, component reliability design, etc. were conducted. Reliability development tests and reliability analysis and evaluation research were conducted on the prototype. The one-sided lower confidence limit of the average life span θ_L≈5635 times calculated according to the exponential distribution statistical test (confidence level is 95%). Meet the index requirements of average life span.