Ball valve installation method

The ball valve is a type of shut-off valve and is widely used in boiler high-pressure pipelines of thermal power plants, such as hydrophobic, deflation, and pressure measurement points. Because its structure is different from other shut-off valves, it cannot be properly installed and used. , Will cause valve damage, leakage, so that the valve is ineffective, and even cause a major quality of the ball valve is a kind of shut-off valve, widely used in boiler high-pressure pipeline, such as hydrophobic, gas, pressure measurement point and other locations Because its structure is different from other shut-off valves, if it is not properly installed and used, it will cause valve damage, leakage, and loss of the valve, and even cause major quality accidents. This article elaborates the installation and use of valves from aspects of valve structural characteristics, installation and usage precautions, etc., combined with years of on-site installation experience, and has a certain guiding role in the safe and economic operation of thermal power plants.

1. Structure and characteristics analysis

1.1 Structure Introduction Ball Valve Installation The valve body is an assembly. The valve controls the on/off status of the valve through the rotation of the ball (key 19). When the valve is closed, the valve seat is fixed on the valve body (key 20). Part No. 21) withstands the pressure of the media delivered to the ball. The other end of the ball is supported by the valve seat, the disc spring, the transition sleeve and the joint (key 14). The joint and the valve body are welded structure. The stem and the valve body are sealed by the packing group, and the bolted bracket is used. Press firmly. There are three typical valve body valve body: A105, A182-F22 and A182-F91, a wide range of applications, ball valve body structure shown in Figure.

1.2 Characteristics Analysis Since one end of the ball is fixed by the disc spring, the ball valve can only be subjected to one-way force, the medium is one-way flow, and the mass flow direction in the figure is only: right→left.

Due to the simple structure of the ball valve, relatively few components, low price, and a wide range of applications, the valve is relatively cost-effective.

In addition, from the structural point of view, the ball seal is a linear contact surface. Even if the joint is removed, the ball, the disc spring and other components cannot be reset. This valve cannot replace the ball and cannot grind the sealing surface, that is, the valve cannot be disassembled.

Process:

The foil roll is introduced into the rubber roller of the feeding device via the decoiling machine and then would in the winding former after passing through the edge of the Shearing Machine and the roller wheel of the burr pressing device. The inter layer insulation coil is erected in the rear of the coiling optical shaft of the Foil Winding Machine and wound in the winding former after sheared by the trimming roll and the shears blade.

Functional feature:

1. The device adopts and electrical servo deflection correction system to achieve manual/automatic adjustment of the foil position more conveniently and reliably.

2. An advanced electrical control technology of constant tension is adopted to control the tension of the foil and the inter layer insulation, with the features such as quantitive, accurate and convenient control of the tension no mechanical friction. The required tension can be maintained for forward winding, stop and backward winding, ensuring compact coils.

3. The inter layer insulation adopts a cantilever mechanism, convenient for feeding and the mechanism can be pulled out as a whole without guide rails outside the body.

4.  Automatic welding mechanism and roll shearing mechanism adopt ball screws and linear guide rails for drive, ensuring the service life and accuracy of the device.

5. This device first adopts the all-in-one sing frame, solving problems such as few coil urns and deflection correction lag.

6. This device is a hi-tech product produced by combining with actual production on the basis of many similar products at home and abroad. The whole machine is controlled via an advanced PLC touch screen, with high automation level and simple and reliable operation, representing higher production level of domestic foil winding machines.

 

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