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Standard volume tube classification and basic structure Technical support

(1) Classification of standard volume tubes
According to the direction of movement of the converter, it can be divided into one-way type and two-way type. According to the structure of the volumetric tube of the electromagnetic flowmeter, it is divided into the structure of the reading structure and the type without the yin. Ball, two ball and one ball.
For a multi-ball volume tube, each ball can be used as one and the converter is used.
(2) Basic structure of several main volume tubes
1. Three balls, no boring, one-way volume tube
The so-called one-way type volume tube means that the displacer (ball or piston) runs in only one direction in the standard pipe section. The volume of the liquid displaced between the two detection switches in the one-stroke of the sharp changer is used as the verification electromagnetic flow. The standard volume value of the meter.
This type of volumetric tube has a total of three balls, two of which act as a seal in the sealing section (insulating the inlet and outlet flow in the sealing section to prevent collusion there), and the other ball operates as a displacer in the volumetric section Function. Through the cooperation of pushing the ball, the upper pin and the lower pin, each ball changes its function sequentially. This type of standard volume tube can be divided into vertical and horizontal.
(1) Three-ball, valveless, one-way horizontal volume tube
This volumetric tube is a relatively early structural form for the three-ball type, as shown in Figure 7-16. The operation process is as follows:
Before the volume tube is operated, first open the quick-opening blind plate, push the two balls into the sealing section with the pusher 12, and then put the latch 7. The ball falls into the entrance of the sealing section, and the ball is pushed 12 Pushed by the ball, it is pushed into the sealing section. The ball in front of the sealing section is pushed down and placed on the lower protruding pin 5, and then restored to the working state before the volume tube is operated in the submersible electromagnetic flowmeter.
When the volume tube is running, the lower insert 5 is retracted, and the ball falls into the launch tee, and is pushed into the standard tube section of the volume tube 10 under the push of the liquid. When the ball passes the initial detection switch 8, the calibration starts, when the ball After the check switch 9 is terminated, the calibration process is completed. At this time, the ball continues to run forward until the top of the upper pin 7. At this time, the ball 12 is first pushed, and then the latch 7 is received, and the ball falls into the sealing section. At the entrance, the pusher is operated and the ball is pushed into the seal section under the push of the pusher. Moreover, the ball in front of the sealing section is pushed down and placed on the lower latch 5 which has been extended. At this time, it is restored to the work preparation state before the volume tube is operated.
The three-ball, valveless, one-way horizontal volume tube features:
1 volume tube body processing is relatively simple, especially for large diameter volume tube is more economical,
2 volume tube body maintenance costs are relatively low,
3 As long as the outer diameter of the three balls remains the same, the reproducibility remains unchanged.

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