Pneumatic valve is a kind of valve controlled by air pressure, which is widely used in industrial automation control system. Its main applications include the following aspects:
1. Fluid control: pneumatic valve can be used to control the flow and direction of liquid or gas, such as controlling the flow in the pipeline, exhaust gas emission, etc.
2. Pressure control: pneumatic valve can be used to control the pressure of fluid, such as controlling the pressure of compressed air, regulating the pressure in the hydraulic system, etc.
3. Temperature control: pneumatic valve can be used to control the temperature of fluid, such as the temperature of heating or cooling system.
4. Automatic control: pneumatic valve can be linked with sensors, PLC and other equipment to realize automatic control, such as automatic production lines, robots, etc.
5. Safety control: pneumatic valve can be used for safety control, such as controlling emergency stop, preventing overload, etc.
In general, pneumatic valve plays an important role in industrial automation control system, which can improve production efficiency, reduce costs, and ensure safety.
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1. The enthalpy layer formed by the grinding force. During the grinding process, the outer surface of the workpiece will be affected by the cutting force, compressive force and friction of the grinding wheel. Especially the effect of the latter two; the outer surface of the workpiece is very directional. Plastic deformation layer and work hardening layer. These metamorphic layers must affect the change of residual stress in the outer layer. /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
2. The secondary quenching burn will change the stress of the outer surface of the nsk bearing workpiece. The secondary quenching zone is under pressure; the maximum tensile stress exists in the high temperature tempering zone below; here is the local crack that is most likely to occur at the center of the crack. The simplest is conveyed along the original austenite grain boundary. Severe burns will cause the entire grinding surface to appear cracks (more cracks) to form the workpiece.
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Bearing crack disposal method
Source: China Bearing Network Time: 2013-05-21