DGS150 API674 Process Diaphragm Pump

The operating principle of the DGS150 high pressure process diaphragm pump involves completely isolating the mechanical motion of the drive end from the process medium at the discharge end. Using hydraulic oil as the intermediate transmission medium, the reciprocating motion of the piston or plunger is converted into elastic deformation of the diaphragm, which periodically changes the volume of the pump chamber to facilitate the suction and discharge of the medium.

Technical Specifications

Flow Range: ≤100 m³/h

Pressure Range: ≤120 MPa

Advantages

1. Absolute sealing: Due to the presence of the diaphragm, the conveyed medium is completely isolated from the lubrication system and drive mechanism. This makes it suitable for the conveyance of toxic, flammable, explosive, highly corrosive, or high-purity media, with a leakage risk approaching zero;

2. High pressure adaptability: By optimizing diaphragm materials, hydraulic control strategies, and pump head structural strength, it can meet the demands of extreme operating conditions;

3. Flexible flow regulation: By adjusting the drive speed, stroke length, or using variable frequency control, flow can be precisely adjusted over a wide range. Additionally, the flow-pressure relationship is highly linear, facilitating automated process control. 

Function

1. Reliably conveys and accurately meters corrosive, highly toxic, particulate-laden, or high-viscosity media under high-pressure conditions.

2. Compared to conventional centrifugal or gear pumps, it uses a flexible diaphragm that expands and contracts to create changes in the working chamber volume, thereby isolating the conveyed medium from the drive mechanism and eliminating the risk of dynamic seal leakage, making it indispensable in chemical processes.

Applications

• In the oil and chemical industry, it is used for ultra-high-pressure catalyst injection in high pressure polyethylene reactors, high pressure feed systems in hydrocracking units, and water injection pressurization systems in oilfields;
• In the fine chemicals and pharmaceutical industries, it handles the high pressure metering and transportation of high-value, highly toxic intermediates;
• In the energy sector, it is applied to high pressure coal slurry feeding in coal gasification units and boric acid injection systems in nuclear power plants;
• In environmental engineering, they are used in high pressure reverse osmosis seawater desalination, high pressure sludge dewatering, and supercritical water oxidation treatment of hazardous waste.

Product Rendering

Key Technical Considerations for Selection, Operation, and Maintenance

During the selection phase, comprehensively evaluate the chemical properties, temperature, solid content, and pressure-flow conditions of the medium to appropriately determine the diaphragm material, pump head material, and hydraulic system type. For media containing particles, install an inlet filter or use special valve types to prevent valve assembly wear and sticking. During operation, close attention must be paid to monitoring hydraulic oil cleanliness and oil level, as contamination or insufficient oil can cause abnormal stress on the diaphragm and shorten its service life. At the same time, a diaphragm condition monitoring mechanism should be established to enable predictive replacement of the diaphragm by detecting hydraulic oil leakage, pump head vibration, or acoustic characteristics, thereby avoiding downtime losses. Additionally, the installation and regular calibration of safety accessories, such as high pressure safety valves and diaphragm rupture alarms, are essential for ensuring the intrinsically safe operation of high pressure diaphragm pumps.