Diaphragm metering pump repair, the diaphragm The flexibility of using specially planned processing for the type metering pump the diaphragm Replace the piston, complete the reciprocating movement under the effect of driving tissue, and complete the suction discharge process. because the diaphragm The barrier effect of is structurally completing the barrier between the metered fluid and the driving smooth tissue. High tech structural planning and data selection have greatly improved the service life of the barrier. In addition, composite data has excellent corrosion resistance, the diaphragm Type A metering pump has become the main pump type in fluid metering application.

　　 the diaphragm Basic protection for some defects of the metering pump:

(1) How to replace the diaphragm ?

1. Remove 4 screws fixing the pump head. The screw orientation is on the opposite side of the barrier metering pump.

2. After the pump head is loose, adjust the stroke length to 0 * before removing the pump head. It can ensure that the electromagnetic shaft has sufficient pressure, adhere to its connection and stability, so that it can be unscrewed the diaphragm 。

3. Pull the hydraulic end outward to disengage the screw from the socket. Hold the liquid end and rotate it counterclockwise. Slight resistance, able to unscrew the diaphragm 。

4. Once the diaphragm Removed, check the diaphragm * Total of metering pump the diaphragm , ensure that it is intact and free from any damage. Device new the diaphragm , rotate the backplane and the diaphragm Until it is snug. Adjust the back plate so that the leakage discharge hole is located at the bottom of the pump.

5. On the diaphragm After the device is completed and the backplate leakage discharge hole is placed in a straight direction, the pump head is installed. Ensure that the suction valve is aligned with the leakage discharge hole, and the screw at the hydraulic end is aligned with the corresponding 4 holes.

6. Rotate to the position of stroke length 100 *. In this way, the whole set of components can be rotated until the leakage discharge hole of the back plate is aligned with the bottom of the pump. Adjust the hydraulic end and the diaphragm To an appropriate position.

7. After the hydraulic end and the back plate are aligned, tighten the four bolts diagonally until they stop properly. Use even force when finishing this task.

(2) How to avoid burnout of stroke positioning motor?

When adjusting the stroke direction, ensure that the motor * is working at the end. If the motor is not operating, the stroke length adjusting rod should resist the tension of the tightening tension spring, which will lead to premature failure of the stroke positioning motor.

(3) How to remove the old ones conveniently the diaphragm ?

Move the hydraulic end by loosening 4 pump head screws. Turn the stroke length to 0 *, hold the hydraulic end, and then slide out from the screw hole. The screws do not touch them, but still operate the back plate and the diaphragm 。 Then rotate the part counterclockwise, with slight resistance, the diaphragm It will loosen from the electromagnetic shaft. If the diaphragm It's not loose yet the diaphragm Apply some smooth oil to the touch surface of the electromagnetic shaft. After being placed for several minutes, use a small plastic hammer to strike quietly the diaphragm 。 Then proceed again according to the above description.

(4) When self absorption method is used to measure hydrogen peroxide, cavitation occurs in the system. How to deal with this problem?

　　 the diaphragm The metering pump is equipped with a self discharging pump head, and self filling liquid suction is selected. Keep the suction line as short as possible.

(5) Do not measure liquid medicine after installation and operation?

1. Is the secretory tube installed and the secretory valve closed? The secretion valve needs to be opened in the liquid introduction phase. Note: Not everything the diaphragm All metering pumps have secretion valves.

2. There may be gas leakage at the suction end of the metering pump. The connector on the suction side of the hydraulic end may be short of O-ring or the connection of the suction valve is loose.

3. The bottom valve may be blocked, and the metered liquid medicine cannot pass through.

　　4. the diaphragm The stroke length of metering pump is not set properly.

5. The metered chemicals may crystallize at the hydraulic end, causing the ball and seat of the one-way valve to fail to operate normally.

(6) I am using flow supervision to measure a medium with high viscosity, and I have received the flow fault indication signal during the liquid introduction process. How can I deal with this problem?

For the reaction time, the pulse duration may not be long. Compared with the standard pulse width of 80msec, the pulse width extension of the flow monitor can be activated, and the pulse width can be added to 300msec* Activate the intelligent change-over switch, remove the cover fixing the circuit board, and remove the jumper X-1. In this way, the extended function will be activated, and more time will be promised before the fault indication.

Recommended reading: Pulsafeeder , Pulsafeeder metering pump, PASFIDA agent