How to prevent blockage and jamming of the control valve in the pipeline of the chemical central pump?

Chemical centrifugal pumps can transport critical state fluids. When the temperature of a critical state fluid rises or the pressure drops, it often vaporizes To avoid the mechanical seal, packing seal, labyrinth seal, etc., due to dry friction and damage, this type of chemical pump must have a structure that fully the gas generated in the pump. When installing the centrifugal water pump, a gate valve is generally installed in the pipeline of the supporting facilities. The control valve is a common regulating valve device. Depending on the application and the liquid in the conveyor, the control valve will block or jam in the phase-out part. So how to prevent blockage jamming of the control valve in the pipeline of the chemical centrifugal pump? The following content will simply introduce it for you, hoping to help you.

1. Pipe filter installation method

For valves with adjustable diameters, especially small flow rate valves, where the throttle valve gap is very small, there should not be any debris in the medium. In this case, a filter device should be installed in the pipeline in front the valve to ensure that the medium can pass through smoothly. For control valves with positioners, if the positioner works abnormally, the blockage of the throttle valve port the hydraulic valve block is a common fault. Therefore, when the positioner is working, it is necessary to solve the air source problem. The general method is to install a gas pressure regulator in the air source pipeline in front of the positioner.

2. Medium erosion method

Use the erosion kinetic energy of the medium itself to erode and away items that are easy to settle and block, thereby enhancing the anti-blocking effect of the valve. Common methods include: changing to a flow-closed type application; using moving sense oil circuit plate; placing the throttle valve port in the most erosive place, using this method, it is necessary to pay special attention to increasing the erosion resistance of throttle valve material.

3. External erosion method

When adjusting with ordinary valves for certain media that are easy to settle and contain liquid particles, the throttle valve port guide position are often blocked. You can connect an external erosion gas and steam at the bottom plug of the lower valve cover. When the valve is blocked or stuck, open the external or steam valve, and the cleaning work can only be done without moving the control valve. Let the valve work normally.

4. Direct connection to angle type method

 connection is a reverse S flow, the flow path is complicated, and there are many dead zones in the upper and lower cavities, which provide areas for the settling of the medium. the case of an angle connection, the medium is like passing through a 90° elbow, with good erosion characteristics, small dead zones, and is easy to design into a. Therefore, when the control valve with direct connection is slightly blocked, it can be changed to an angle valve for use.

5. Expand the throttle valve gap method

If the solid particles in the medium or the welds and rust that are corroded in the pipeline cannot pass through the throttle valve port, resulting in blockage, jamming and other common faults, it can be changed to a throttle valve with a large throttle valve gap—a throttle valve with an open window, open mouth type valve core, and sleeve Since its throttle valve area is concentrated and not distributed on the circle, the fault can be easily eliminated. If it is a single or double seat valve, you can change the pist-shaped valve core into a "V"-shaped port valve core or change it into a sleeve valve, etc.

6. Cleaning method

The welding, rust debris, etc. in the pipeline cause blockage or jamming at the throttle valve port, guide position, and lower valve cover balance hole wall, causing damage to the valve core plane, guide surface, and indentation on the protruding surface, etc. This often occurs in newly put into use systems and in the early stage after maintenance. This is common fault. In this case, it is necessary to disassemble and clean, remove the debris, and grind the protruding surface if it is damaged; at the same, open the bottom plug to flush away the debris that falls into the lower valve cover from the balance hole, and clean the pipeline. Before putting into use, let the control valve open, let the medium flow for a period of time, and then include it in normal operation