Besides metal pneumatic butterfly valves, what other pneumatic butterfly valves are there
There are many kinds of pneumatic butterfly valves. As far as I know, there are metal pneumatic butterfly valves, pneumatic butterfly valves. What other pneumatic butterfly valves do you not know? Next, let's understand other types of pneumatic butterfly valves!
1. Wire rope pneumatic butterfly valve
The wire rope pneumatic butterfly valve is the most widely used pneumatic butterfly valve in China at present, which is often used as the vibration damping support of vibration equipment. The advantages are that the natural frequency can be controlled within 20Hz, the price is cheap, the performance is stable, high temperature resistance, low temperature resistance, oil resistance, corrosion resistance, aging resistance, and long service life. It can be used for elastic support with different requirements, can be preloaded, and can also be made into suspension type. The disadvantage is that the damping performance is poor and the isolation effect of high-frequency vibration is poor. In high frequency, the ball valve gradually becomes rigid, its elasticity becomes worse, and its vibration isolation effect becomes worse, which is called "high frequency failure". At present, the small spiral steel ball valve group is combined with cast iron shell, and some damping measures are taken, but the practical damping is not improved much. Padding the shock absorber can weaken the effect of high-frequency failure, but some of them are easy to age under pressure, and sometimes they can be installed in the air, which is more ideal.
2. Pneumatic butterfly valve
It will be cured and cut to form various pneumatic butterfly valves. The advantage is that it can isolate vibration not only in the axial direction, but also in the rotation direction, and the natural frequency can be controlled within 15Hz. The internal damping is much larger than metal, and the high-frequency vibration isolation effect is good. The device is convenient, easy to bond with metal firmly, small in size, light in weight and low in price. The defect is aging resistance. The common operating temperature range is 0-70 ℃, and the lower limit temperature of the special process can reach - 50 ℃. It is easy to age in the air, especially under direct sunlight. The common service life is 5-10 years, and the load characteristics are often not different. It is not subject to the effect of long time and large load, which will cause relaxation. The performance and quality of the vibration isolator mainly depend on the formula and vulcanization process. The vulcanization temperature and time are very important, and the process can be confirmed only after repeated experiments.
Metal pneumatic butterfly valve
3. Vibration isolation pad
Unlike pneumatic butterfly valves, the vibration isolation pad is a plate, which can be placed between the vibrating equipment and the foundation in a large area. Some grooves are often cut out on the surface of the vibration isolation pad to meet the deformation requirements during compression. It is widely used because of its durable high elasticity, good vibration isolation, shock isolation and sound insulation performance. The applicable vibration isolation natural frequency of the vibration isolation pad is 10-15Hz, and the multi-layer stacking can be lower than 10Hz,. The defects of vibration isolation pads are similar to those of vibration isolators. They are easily corroded by temperature, oil quality, sunlight and chemical reagents, resulting in performance degradation and aging. The common service life is 5-10 years. They should be checked and replaced regularly.
4. Glass wool board and rock wool board
As an elastic cushion, glass wool can play a very good role in reducing vibration of machines or building foundations. When the load is 1-2T/m2, the preferred thickness is 10-15cm, the unit weight is 64kg/m3, and the natural frequency is about 10Hz. When the unit weight of rock wool board for vibration isolation is 120kg/m3, the load is 250kg/m2, and the thickness is 10cm, the natural frequency is about 16Hz. The advantages of glass wool board and rock wool board are fire resistance, corrosion resistance and temperature resistance. The defect is that it needs to be waterproof, deformed after being damped, and the vibration isolation effect drops.