The LDJM mechanical diaphragm metering pump is a motor-driven reciprocating positive-displacement pump developed for accurate and continuous dosing of corrosive and non-corrosive liquids. Its discharge capacity can be continuously adjusted between 0 and 100%, allowing operators to match the dosing rate to different process requirements.



The pump uses a compact eccentric cam drive and a PTFE-rubber composite diaphragm to provide stable operation, excellent corrosion resistance and reliable separation between the chemical medium and the mechanical transmission components. The dosing flow can be adjusted whether the pump is running or stopped, making process regulation convenient and flexible.



Different wetted-material configurations are available, including PVC, PTFE, 304 stainless steel and 316 stainless steel. Special materials can also be selected according to the chemical properties, temperature and operating conditions. The leak-free diaphragm structure makes the pump suitable for handling corrosive, toxic, hazardous, flammable or strongly odorous liquids.



With a maximum rated pressure of 0.8 MPa, metering accuracy of ±2%, and multiple flow and motor configurations, the LDJM series is suitable for chemical dosing in water treatment, petroleum, chemical processing, environmental engineering, pharmaceuticals, papermaking, metallurgy and mining.


 

1. Water and Wastewater Treatment
The mechanical diaphragm metering pump can accurately inject coagulants, flocculants, disinfectants, acids, alkalis and pH-adjustment chemicals into municipal and industrial water-treatment systems.

2. Chemical Processing
It is suitable for feeding chemical additives, catalysts, reagents and process liquids into tanks, pipelines, mixers and reactors.

3. Petroleum and Petrochemical Industry
The pump can be used for controlled injection of corrosion inhibitors, scale inhibitors, demulsifiers, biocides and other petroleum-processing chemicals.

4. Environmental Protection
It can provide continuous or intermittent dosing for wastewater neutralization, odor control, sludge treatment and pollution-control processes.

5. Boiler Water Treatment
The pump is suitable for phosphate, ammonia, oxygen scavenger, corrosion inhibitor and scale inhibitor dosing in boiler and feedwater systems.

6. Cooling-Water Treatment
It can inject biocides, scale inhibitors, corrosion inhibitors and pH-control chemicals into industrial circulating-water systems.

7. Food and Beverage Processing
With a suitable wetted-material configuration, the pump can be used for process-water treatment and controlled addition of compatible liquid additives.

8. Pharmaceutical Industry
It can deliver chemical reagents and treatment liquids where accurate flow adjustment and leak-free operation are required.

9. Pulp and Paper Industry
The pump is suitable for chemical addition during pulping, bleaching, papermaking and wastewater-treatment processes.

10. Textile Dyeing and Finishing
It can be used to meter dyes, auxiliaries, acids, alkalis and finishing chemicals into textile-processing systems.

11. Metallurgy and Mining
The pump can inject flotation agents, pH-control chemicals, reagents and water-treatment chemicals in mineral-processing and metallurgical plants.

1. Continuously Adjustable Dosing Flow
The pump discharge can be adjusted from 0 to 100%, enabling flexible chemical dosing according to changes in process demand.

2. Mechanical Diaphragm Design
The mechanical diaphragm separates the chemical medium from the drive mechanism, reducing leakage risk and improving operating safety.

3. PTFE Composite Diaphragm
A PTFE and rubber composite diaphragm provides strong chemical resistance, good flexibility and extended service life when handling aggressive liquids.

4. Compact Eccentric Cam Drive
The eccentric cam transmission provides a compact pump structure and requires limited installation space.

5. Flow Adjustment During Operation
The dosing capacity can be adjusted while the pump is operating or when it is stopped, simplifying system control and commissioning.

6. Stable Mechanical Operation
The double-cam ball-bearing drive helps maintain smooth reciprocating movement and stable chemical discharge.

7. Simple Lubrication System
The dip-feed lubrication design requires only periodic oil replacement and does not require a complicated independent lubrication system.

8. Multiple Wetted-Material Options
Available wetted materials include:
PVC
PTFE
304 stainless steel
316 stainless steel
Customized special materials

9. Leak-Free Chemical Delivery
The diaphragm pump head provides reliable sealing and is suitable for hazardous, toxic, corrosive, flammable and strongly odorous chemicals.

10. High-Precision Check Valve
The one-way non-return valve supports accurate metering, compact installation, good sealing, convenient replacement and long service life.

11. Broad Chemical Compatibility
Different pump-head and valve materials can be selected for acids, alkalis, disinfectants, additives and other industrial chemicals.

12. Easy Maintenance
Its straightforward mechanical construction reduces maintenance difficulty and allows convenient inspection and component replacement.