The cause of the pneumatic valve mechanical noise

the noise of the air conditioning system control pneumatic valve produce mainly in machinery, pneumatic valve, pneumatic valve stem, some can be active parts. Due to fluid pressure fluctuations, or by the influence of fluid, or on aerodynamic body leads to a huge gap between the shaft sleeve and the outer, will cause the vibration. For example, pneumatic valve core is relative to the pneumatic valve core, pneumatic seat collisions between lateral movement guide surface. If the gap between the parts, if you can't transfer force, vibration, friction and collision will have effect. These collisions are rigid collision, the sound is clear metallic sound and tapping. The noise of the impact excitation spectrum is continuous sound and wide frequency range. Collision energy of noise, vibration, body mass, stiffness damping, the size of the amplitude. The vibration frequency less general than HZ.
if the vibration frequency and inherent frequency is close to or the same, can produce resonance. Function not only has a great deal of resonance mechanical noise, frequency can reach? HZ, there will be a lot of stress damage can cause the vibration of the fatigue damage of parts. Under vibration natural frequency are simply part of the piston of pneumatic valve pneumatic valve core, pneumatic valve core in the shape of a vessel wall window, flexible parts ( Such as pneumatic valve metal sealing ring. ）
mechanical noise, can produce dry friction. When two surfaces ( Such as pneumatic valve core and pneumatic seat) Interact to produce, the other piece, it is a relative motion on the surface of the friction. Between each other due to the surface of the energy loss caused by the rough surface embedded and molecular cohesion, adhesion, and wear surface, part of hot, plastic deformation, vibration and noise. The high frequency vibration noises of dry friction noise, it sounds harsh, it is difficult to bear. If the two has good lubricity, improve the surface roughness and friction surface geometric accuracy, reduces the dry friction.
noise caused by mechanical parts, it is hard to predict. However, this kind of noise, events that measuring instrument on the spot. Mechanical noise reduction methods is to improve the structure of the pneumatic valve itself, especially the core seat structure and structure, and increase the stiffness of policy, as part of the lower the quality of the moving parts.