The key reason a valve fails to open after being closed for an extended period is that, due to the media and environmental influences, the valve's internal components undergo physical or chemical changes during prolonged static operation. This can cause moving parts (such as the valve stem, gate, and ball) to become stuck or locked, preventing them from operating normally.

Selecting valves for corrosive media like strong acids and alkalis is a critical and highly specialized issue. Improper selection can lead to rapid valve failure and media leakage, resulting in safety incidents, environmental pollution, and production interruptions.

The core reason for the slow movement of pneumatic valves is "insufficient power (compressed air)" or "excessive resistance" to drive the valve movement, which causes the actuator to push the valve core/disc and other components to move at a lower speed.

Clarify Valve Function and Identify Valve Application: When selecting common valves in chemical engineering design, it is important to fully understand their specific functions and accurately identify their intended use.

As the core component of a fluid control system, the quality of its installation directly affects the operating efficiency, safety and service life of the system.
During the actual installation process, various errors are prone to occur due to improper operation, insufficient technical knowledge or inadequate control of details, which may not only lead to leakage, increased energy consumption and other problems, but also cause equipment damage and safety accidents in serious cases.

304, 304L, 316 and 316L are stainless steel grade codes in the American material standard (ANSI or ASTM), belonging to the 300 series of austenitic stainless steel. The corresponding grades in the domestic material standard (GB/T) are 06Cr19Ni10 (304), 022Cr19Ni10 (304L), 06Cr17Ni12Mo2 (316), 022Cr17Ni12Mo2 (316L). This type of stainless steel is usually referred to as 18-8 stainless steel.