I'm not sure when it started, but everything seems to have an expiration date these days.
Even mackerel, meat sauce, and even plastic wrap have an expiration date.
It makes me wonder—what in this world doesn't expire?
The lifespan of a valve is often affected by improper operation or prolonged use, leading to various issues. Today, COVNA's editor is going to talk about the common failures that may occur with pneumatic valves and their solutions. Be sure to save this—it's super useful!
Common Pneumatic Valve Failures:
1. Packing Leakage
Cause: Bent valve stem
Solution: Straighten the valve stem
Cause: Insufficient smoothness of the valve stem
Solution: Polish the valve stem
Cause: Deformation or damage of the packing gland
Solution: Repair or replace the packing gland
Cause: Incorrect packing type or size selection
Solution: Select and replace the proper packing
Cause: Packing is corroded or deformed
Solution: Re-select suitable packing with appropriate performance
Cause: Packing layer buildup or improper packing method
Solution: Install a packing ring and repack
2. Slow Operation of Pneumatic Valve
Cause: Pneumatic actuator's torque is too low
Solution: Increase the size of the actuator
Cause: Cylinder friction is too high
Solution: Lubricate properly
Cause: Insufficient air source pressure
Solution: Increase air source pressure; install a storage tank to reduce pressure fluctuations during operation
Cause: Valve load is too large, and valve core or other components are too tight or improperly adjusted
Solution: Recalibrate and adjust the valve torque
3. Pneumatic Valve Not Working Properly
Cause: Electromagnetic valve is normal, but the coil is burned out, or the valve core is jammed with dirt
Solution: Replace the electromagnetic valve, replace the coil, and clean the dirt
Cause: Twisted or flattened piping
Solution: Correct or replace the piping
Cause: Manual operation system's handle is in the manual position
Solution: Switch the handle to the pneumatic automatic position
Cause: Ball valve in the core is jammed due to impurities
Solution: Remove impurities and replace damaged valve components
Cause: Medium or ambient temperature is too low, causing the pipeline to freeze
Solution: Drain condensation or use water-removal equipment
Cause: Check whether the single air supply system for the actuator works properly, e.g., air piston leakage, cylinder body or end cap/shaft leakage. Disassemble the actuator and check for damage to seals or wear on the cylinder bore surface.
Solution: Replace damaged seals, and replace the cylinder or piston if necessary
4. Other Failures
Cause: Valve starts jumping at the beginning of operation due to excessive load
Solution: Increase the size of the actuator
Cause: Valve jumps or moves too quickly at the end of the operation due to excessive inertia
Solution: Install a speed control valve or external damping buffer
Cause: Internal valve components wear
Solution: Repair the mating surfaces
That's all for COVNA's share today! If you'd like to learn more, be sure to follow us!
