Dositec DOSTEC® 40-300 High Volume Piston Chemical Injection Pump

The DOSTEC® 40 is a high-performance piston or diaphragm dosing pump designed for accurate dosing of liquid products into hydraulic systems. It is suitable for applications such as water treatment, agriculture, chemical processing, food processing and textile industries.

Yes. The DOSTEC® 40 is available in both piston and diaphragm configurations. The piston range covers approximate flow rates from 2.5 to 600 L/h, while the diaphragm range covers approximate flow rates from 5 to 300 L/h, depending on the selected model.

Pressure depends on the selected model and dosing head. Some models are available up to 20 bar, with lower-pressure options available for higher flow versions. The manual notes that 20 bar models are only available with ceramic piston.

The dosing flow rate can be adjusted from 0% to 100% of pump capacity using the micrometric regulator, without stopping the pump. The pump can also be controlled with a frequency inverter, allowing flow adjustment from 10% to 100% by varying motor frequency.

The DOSTEC® 40 is available in multiple motor options, including three-phase 230/400V, single-phase 230V, single-phase 110V, and 12V or 24V DC versions with 130W or 300W motors.

The DOSTEC® 40 can be supplied with wetted materials such as PP, PVDF and AISI 316 stainless steel. Piston options include PEUAPM or ceramic, while diaphragm models use an elastomer base reinforced with fibre and PTFE covering.

Suction lift varies by model, with many versions rated up to 9 metres / 30 feet when the dosing head and pipework are filled with water at 20°C. Higher flow models may have lower suction lift depending on configuration.

The pump should be installed in a location protected from water, away from heat sources and with adequate air circulation. It should be mounted on a rigid, horizontal surface and fixed with four screws.

The installation should include a 150 micron suction filter, injection check valve, safety relief valve, pressure gauge and, where required, a pulsation dampener, pressure regulating valve, flowmeter and calibration cylinder.

The oil should be changed after the first 500 hours, then every 2000 hours or at least once per year. The piston, seals, diaphragm, bellows and valves should be checked every 3 months or 1000 hours, and the suction filter should be checked monthly.