What is the difference between the overflow pneumatic valve and safety valve

security pneumatic valve is boiler, pressure vessel and other pressure equipment on important safety accessories. Its operating reliability and performance is directly related to the equipment and personal safety, and closely related to energy saving and environmental protection. And some users in the selection and design department, always choose the wrong type. In this paper, the safety of the pneumatic valve is chosen for this analysis.
security pneumatic valve and discharge the definition and distinction of pneumatic valve:
the so-called security broad sense including pneumatic valve pneumatic valve, discharge from the point of view of management rules, directly installed on the steam boiler or a pressure vessel, the necessary condition that must be recognized technical supervision department of the pneumatic valve, pneumatic valve in a narrow sense as security, other general called pneumatic valve discharge. Security pneumatic valve and relief valve on the structure and performance are similar, both are automatic emissions over the opening pressure within the medium, to ensure the safety of the production plant. By similarities do exist in the essence, people when use, often to the confusion, in addition, some production device on the rules and regulations which all can choose. Therefore, the difference between the two often ignored. Thus appeared many problems. If you want to compare both make a clear definition, can be in accordance with the ASME boiler and pressure vessel code 'in the first article in this paper, the definition to understand: ( l） Pneumatic valve ( 安全阀) A static pressure driven by pneumatic valve before medium pressure relief device automatically. Characterized by popping all open action. Used for gas or steam occasions, as shown in figure.
（ ） Pneumatic valve discharge ( 安全阀) Pneumatic valve, also known as the overflow a static pressure driven by pneumatic valve before medium pressure relief device automatically. It increases with the increase of pressure more than open force in proportion to open it. It is mainly used for fluid. As shown.
（ ） Pneumatic valve (safety discharge Safet安全阀) , also called safety overflow a pneumatic valve driven by medium pressure automatic pressure relief device. According to different occasions of applicable for safety are also applicable to the pneumatic valve for pneumatic valve discharge. In Japan, for example, to secure pneumatic valve and relief valve to make less clearly defined, can generally used for this kind of large boiler pressure vessel safety device called a pneumatic valve, installed on the pipe or other facilities called pneumatic valve discharge. If, however, according to Japan's miti 'thermal power technology standard' regulation, an important part of equipment safety, specify the use of safe, pneumatic valve, such as boiler, superheater, reheater, etc. And on the under side of the reduced pressure pneumatic valve need to connect with the boiler and turbine occasions, all need to install the discharge solenoid pneumatic valve, or safety. So look, pneumatic valve safety requirements more reliability than a pneumatic valve discharge.
in addition, from the labor ministry of high pressure gas management rules,'s ministry, and various shipping association rules, the acknowledgment and provisions for security emissions, we call to ensure the emissions security pneumatic valve, and does not guarantee that emissions called discharge solenoid pneumatic valve. At home no matter the enlightening the type or micro type pneumatic valve are collectively referred to as security.