Problems with diaphragm metering pumps

Here’s an article on Minton-Ro for your reference: Extracted from General Machinery Magazine, March 2009 – Application of Minton-Ro hydraulic diaphragm metering pumps in gasoline blending. Author: Jinxī Petrochemical, CNPC. If you need the full text, please leave an email! V. Common Faults and Solutions: It is a common issue for Milton Roy hydraulic diaphragm metering pumps to fail to achieve the rated flow rate during initial operation. The causes of this problem and the corresponding solutions are as follows. 1) The pump inlet pipeline is blocked. This is a common issue when the pump is in operation; a line filter can be installed on the inlet pipeline, and it should be inspected and cleaned regularly. 2) Leakage in the inhalation pipeline; air is present in the material system. Repair or replace damaged pipe fittings ； Drain the air from the system. 3) The viscosity of the liquid is too high, resulting in difficulties in transporting the medium. Reduce the viscosity by heating or other methods, or increase the diameter of the suction pipe, or increase the suction pressure. 4) Due to excessive temperature, part of the medium vaporizes. Reduce the temperature or increase the suction pressure. 5) Insoluble materials, liquid crystallization, solid deposition. Reduce the solution concentration to an appropriate level, and clean the liquid tank regularly. 6) Air is present in the oil or during pumping. Run at 80% capacity for 5 minutes, then at 100% capacity for 5 minutes to expel the air from the medium. 7) The valve or valve seat is worn or dirty. Clean or replace the components. 8) The lubricating oil in the pump gradually decreases over time due to leaks and other reasons; if the liquid level falls below the indicated level, it may also be impossible to achieve the rated flow rate. It is necessary to check and top up the lubricating oil during inspections to keep the liquid level at the standard level.

The working principle of a diaphragm pump is to use a diaphragm to drive the intake and discharge of liquid. If there is gas present in the liquid or if there are leaks in the pipes, insufficient pressure can prevent the liquid from flowing. Other problems that may arise include corrosion of the check valves at the inlet and outlet, damage to the diaphragm leading to liquid leakage, siphoning effects, and even damage to the circuit board due to improper operation

Such a way of asking questions cannot lead to an answer; there are too many types of diaphragm pumps, and depending on their structure, different faults can occur, so a specific analysis is required!

I’m talking about the membrane metering pumps used in refineries to add corrosion inhibitors – what kind of faults can occur and how to resolve them...

The most common problems with diaphragm pumps are blocked inlet lines, clogged or corroded check valves at the inlet and outlet, damaged diaphragms, seal leakage, and blocked hydraulic oil lines.

This is my email address; please share it with the poster: ywd-7507@163.com

A common problem with diaphragm metering pumps is that they stop delivering fluid. What was said on the second floor covers most of the aspects; here are a few additional points: 1. Puncture in the diaphragm; 2. The oil filling cup fails to supply oil; 3. The safety valve is not functioning properly; 4. Faults in the motor or bearing box that result in low efficiency

One more thing: leakage in the packing seal of the oil chamber

Common reasons for insufficient flow: 1. Clogged inlet filter; 2. Liquid vaporization; 3. Damaged check valve; 4. Internal leakage in the safety valve