Third, in terms of economic performance, the initial investment of electric tools is not high, but long-term energy consumption will increase the cost of maintenance and parts replacement. Although the initial investment of pneumatic ball valve should be based on air compression pipeline equipment, it is better than long-term maintenance and low cost.

The influence of the number of braiding ingots of steel belt in the mesh sleeve of pneumatic butterfly valve on the strength of the mesh sleeve influence of the number of braiding ingots of steel belt in the mesh sleeve of pneumatic butterfly valve on the strength of the mesh sleeve
The influence of the number of steel belt braiding ingots on the strength of the mesh sleeve of the pneumatic butterfly valve. In China, the pneumatic butterfly valve with steel belt braiding mesh sleeve is only trial produced in individual manufacturers at present. In order to discuss the strength of the steel belt mesh sleeve, a brief introduction is given below.
The so-called steel belt braiding of the pneumatic butterfly valve mesh sleeve is composed of several or dozens of steel belts of a certain width, which form a certain included angle along the corrugated bus, and are alternately pinned on the surface of the corrugated pipe. Therefore, when the steel belt mesh sleeve is braided, the theoretical width will definitely depend on the outer diameter of the bellows, the braiding angle and the number of steel belt ingots. However, in practical engineering applications, if the mesh sleeve is woven according to the parameters confirmed by the theoretical formula, it is bound to produce the result that the bellows is completely shielded. The tight mesh sleeve forms a rigid cylinder, which is tightly sleeved on the surface of the bellows, making the bellows unable to play its role. In order to insist that the pneumatic butterfly valve with steel belt woven mesh sleeve also has the same characteristics as the pneumatic butterfly valve with steel wire woven mesh sleeve, it is necessary to make the practical width of the steel belt less than the theoretical width, that is, the ratio of the mesh sleeve to the corrugated pipe cover surface should be less than 1. As long as this is the case, the elasticity and flexibility of bellows can be shown. The smaller the ratio, the more abundant it will be.
If the outer diameter of the bellows is confirmed, the number of steel strip ingots, braiding angle, practical width of the steel strip and the ratio of the mesh sleeve to the cover surface of the bellows are four variables that can adjust each other. When confirming the braiding parameters of steel belt mesh sleeve, it is necessary to consider according to the detailed situation.
The number of steel strip ingots is usually an even number greater than or equal to 4. For manual knitting, it is feasible only within this range; But for mechanical knitting, it is difficult. The number of spindles of domestic finalized knitting machines is fixed and cannot be adjusted. Therefore, the ingot number of the steel belt should be determined according to the ingot number of the existing knitting machine. At present, there are 24 spindles, 36 spindles, 48 spindles of domestic knitting machines, and 64 spindles of imported knitting machines. However, they are specially used to weave steel wire mesh sleeves. The woven pattern is "double flower" pattern, and the steel belt is preferably "single flower" pattern. This kind of knitting machine can be used to weave steel belt nets with only a little modification.
As mentioned before, the practical width of the steel belt must be less than the theoretical width, and the detailed value depends on the ratio of the mesh sleeve to the bellows cover surface.
The ratio of the mesh sleeve to the cover surface of the bellows is generally controlled within the range of 75-95%. If the value is too large, the flexibility of the bellows will be suppressed; If the value is too small, it will not be able to maintain the bellows from mechanical damage such as knocking, bumping, grinding and bumping. Its value also directly affects the performance of the pneumatic butterfly valve, which is just opposite to the weaving angle. If the upper limit value is taken, the pneumatic butterfly valve can accept a higher load, but it is not conducive to its flexibility; If the lower limit value is taken, it is conducive to exerting its soft characteristics, but higher loads cannot be accepted.
As mentioned above, any parameter change may change the performance of pneumatic butterfly valve in some way. Therefore, when confirming the braiding parameters of the steel belt mesh sleeve, it is necessary to consider comprehensively according to the detailed request of the pneumatic butterfly valve.
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