Advantages of metal shock absorber: large static compression, low natural frequency, good low-frequency vibration isolation It is resistant to oil, water and solvents, and is not affected by temperature changes, aging or creep During mass production, the characteristics change very little JA type ball valve damping pneumatic ball valve transformer damper Any sound generated by the unit damper is from vibration, while the noise of the transformer is often solid noise due to the resonance between the transformer and the floor