[Pneumatic control valve / steam control valve] 8 ways to solve vibration - Shanghai Yonglong Valve Factory <br>Pneumatic control valve, electric control valve, steam control valve in the application process by the influence of medium pressure, temperature, may appear micro Vibration, Shanghai Yonglong Valve Factory introduces you to 8 ways to solve the vibration of the regulating valve. I hope to be helpful. Urostomy Bag,Ileal Conduit Bag,Urostomy Bag Covers,Urine Ostomy Bag Wenzhou Celecare Medical Instruments Co.,Ltd , https://www.wzcelecare.com
(A), increase the stiffness method <br> for oscillation and slight vibration, can increase the stiffness to eliminate or weaken, such as the choice of a large stiffness spring, the use of piston actuators and other methods are feasible.
(2) Increase the damping method <br> Increase the damping to increase the friction to the vibration. For example, the valve plug of the sleeve valve can be sealed with an “O†ring, and a graphite filler with a large friction force, etc., which eliminates or weakens slightly. The vibration still has a certain effect.
(C), increase the guide size, reduce the fit clearance method <br> shaft plug valve generally guide size is small, all valve fit clearance is generally larger, 0.4 ~ 1mm, which is helpful for generating mechanical vibration. Therefore, when a slight mechanical vibration occurs, the vibration can be weakened by increasing the guide size and reducing the fit clearance.
(4) Changing the shape of the throttle and eliminating the resonance method <br>The so-called vibration source of the regulating valve occurs at the throttle port with high-speed flow and rapid pressure change, and the shape of the throttle member can be changed to change the frequency of the vibration source. It is easier to solve when it is strong.
The specific method is to turn the valve core surface by 0.5 to 1.0 mm in the range of vibration opening. For example, if a self-operated pressure regulating valve is installed near a certain manufacturer's area, the whistling of the resonance will affect the rest of the staff. After the valve core is turned off by 0.5 mm, the resonance whistling sound disappears.
(5), replace the throttle to eliminate the resonance method <br>The method is:
Replace the flow characteristics, linearly change the logarithm, and change the logarithm linearly;
Replace the spool form. If the shaft plug shape is changed to a "V" groove spool, the double seat valve shaft plug type is changed to a sleeve type;
Change the sleeve of the open window to a sleeve with a small hole.
For example, if a DN25 double seat valve of a nitrogen fertilizer plant, the connection between the valve stem and the valve core is often broken, we confirm that after the resonance, the linear characteristic valve core is changed to the logarithmic valve core, and the problem is solved. Another example is the use of a DN200 sleeve valve in an aviation academy laboratory. The valve plug is strongly rotated and cannot be used. When the sleeve of the open window is changed to the sleeve of the small hole, the rotation disappears immediately.
(6) Replace the type of regulating valve to eliminate the resonance <br>The regulating valve of different structure forms, the natural frequency is naturally different, and the replacement of the regulating valve type is an effective method to fundamentally eliminate the resonance.
A valve resonates very strongly in use—strongly vibrating (destroying the valve in severe cases), rotating strongly (even the stem is broken, twisted), and producing strong noise (up to 100 decibels) The valve, as long as it is replaced by a valve with a large difference in structure, immediately works, and the strong resonance disappears miraculously.
For example, if a new DN200 sleeve valve is used in the new expansion project of a Vinylon plant, the above three phenomena exist. The DN300 pipe will jump, the valve plug will rotate, the noise will be more than 100 decibels, and the resonance opening will be 20-70%. When the degree is large, after switching to a double seat valve, the resonance disappears and the operation is normal.
(7) Reduction of cavitation vibration method <br>The cavitation vibration caused by cavitation bubble collapse should naturally be used to reduce cavitation.
The impact energy generated by the rupture of the bubble does not act on the solid surface, especially on the valve core, but rather allows the liquid to absorb. The sleeve valve has this feature, so the plug type spool can be changed to a sleeve type.
Take all measures to reduce cavitation, such as increasing throttling resistance, increasing the pressure at the contraction port, or decompressing in series or in series.
(8) Avoiding the source wave strike method <br>The external vibration source wave strike causes the valve vibration, which is obviously avoided when the regulating valve works normally. If such vibration occurs, corresponding measures should be taken. 
Shanghai regulating valve manufacturer / Shanghai Yonglong valve factory: pneumatic regulating valve electric regulating valve low temperature electric regulating valve steam regulating valve sleeve regulating valve