Working principle of self-operated regulating valve anti-blocking method

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Working principle of self-operated regulating valve anti-blocking method

1. Cleaning method: Welding slag, rust, slag, etc. in the pipeline cause blockage or jam in the orifice, guide part, and balance hole of the lower valve cover, causing the valve core to be curved and the guide surface to cause strain and scratches, etc. In this case, it must be unloaded for cleaning to remove the slag. If the sealing surface is damaged, it should be ground. At the same time, the bottom plug should be opened to wash away the slag falling into the lower valve cover from the balance hole. Perform flushing. Before the regulating valve is put into operation, let the regulating valve be fully opened, and the medium will flow for a period of time before being brought into normal operation.

2. Medium scouring method: Using the scouring energy of the medium itself, scouring and taking away the things that are easy to deposit and easy to block, thereby improving the anti-blocking function of the valve.

3. The straight-through is changed to the angular method: the straight-through is inverted S flow, the flow path is complicated, the upper and lower chambers have many dead zones, which provide a place for the precipitation of the medium, and the angular connection makes the medium flow through a 90°C elbow, flushing pneumatic The regulating valve has good performance, small dead zone and easy to design streamlined.

4. Method of increasing the throttle gap: the solid particles in the medium or the welding slag and rust that have been washed away in the pipeline can not pass the throttle and cause blockage, jamming and other failures. You can switch to a throttle with a large throttle gap. Flow parts-the throttle area is a window, opening type valve core, sleeve, because the throttle area is concentrated instead of circumferential distribution, the fault can be easily eliminated.

The self-operated control valve relies on the pressure of the electric control valve medium flowing through the valve, and the temperature is used as an energy source to drive the valve to work automatically. It does not require an external power supply or secondary instrument. This self-operated control valve uses the feedback signal (pressure, Pressure difference, temperature) is transmitted to the actuator through the signal tube to drive the valve flap to change the valve opening to achieve the purpose of regulating pressure, flow, and temperature. This kind of regulating valve is divided into direct action and indirect action.

Self-operated control valve Indirect-acting self-operated control valve throttle valve, adds a pilot (pilot valve), which plays a role in amplifying the feedback signal and then through the actuator, drives the main valve disc movement to change the valve opening Purpose, if it is a pressure regulating valve, the feedback signal is the outlet pressure of the valve, which is introduced into the actuator through the signal tube.

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