Mechanical diaphragm dosing pumps – D Series
„D” Series – Mechanical diaphragm metering pumps are normally used when:
Each pump is fitted with a standard gearbox reduction system with a vertical mounted motor. The reduction gearbox is of a standard endless screw plus worm-wheel type, supported by bearing, fully lubricated in oil bath.
Stroke adjustment can be carried with the pump at rest or in operation and it can be manual or automatic through automatic actuator driven by 4-20 mA; different BUS; pneumatic. As mechanical diaphragm they are easy for maintenance.
Furthermore they comply with ATEX standard, therefore they can be installed in Hazardous area.
FAST FACTS
FEATURES AND BENEFITS
„D” Series – Mechanical diaphragm metering pumps are normally used when:
Each pump is fitted with a standard gearbox reduction system with a vertical mounted motor. The reduction gearbox is of a standard endless screw plus worm-wheel type, supported by bearing, fully lubricated in oil bath.
Stroke adjustment can be carried with the pump at rest or in operation and it can be manual or automatic through automatic actuator driven by 4-20 mA; different BUS; pneumatic. As mechanical diaphragm they are easy for maintenance.
Furthermore they comply with ATEX standard, therefore they can be installed in Hazardous area.
| Max. capacity | Qmaks. = 1400 l/h | |
| Max. discharge pressure: |
14 bars | |
| Temperature: | do 70 °C | |
| Motor power: | 0.09, 0.18, 0.25, 0.37, 0.55 or 0.75 kW, 1/3-phase, 1400 rpm | |
| Head material: | AISI 316L stainless steel, PP, PVC or PVDF | |
| Valve ball material: | AISI 316L stainless steel or “PYREX” glass | |
| Valve seat material: | AISI 316L stainless steel or PVDF | |
| Membrane material: | PTFE/NBR | |
| Valve O-ring Material: | FPM | |
| Connection types*: | ½”, ¾”, 1”, 1 ½” male BSP *other connection types available on request |
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| Example of using translate |
Chemical dosing of substances, including: coagulants, fertilizers, acids, polymers, chemicals, etc. They can be used in applications such as:
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The SR series diaphragm dosing pumps are mechanical pumps designed for water treatment and industrial applications. They are reliable and easy to maintain, with the option of a flushing or leak recovery system.
The SR(D) version with a mechanical diaphragm is designed for pumping liquids with a low solid content in applications that do not require high pressure. These devices are ideal for applications where:
The SR (D) series pumps have a very wide range of material options for components that come into contact with the medium. Thanks to the use of a diaphragm, they are very easy to maintain. SR (D) series pumps are the most durable and industrial mechanical diaphragm metering pumps. They have adjustable stroke both during pump operation and during downtime. Stroke adjustment can be performed manually or automatically using an automatic actuator driven by 4-20 mA; various BUS; or pneumatically.
Unlike the simpler SR (A) series model, they do not require hydraulic seals, which reduces the risk of leakage of the fluid being metered by the pump head. The diaphragm is made of PTFE/NBR and is compatible with most existing fluids. The pump heads can be supplied in various plastic or metal versions to make them fully suitable for dosing liquids.
The SR series pumps comply with the ATEX standard, making them suitable for installation in potentially explosive atmospheres.

Dosing pumps are positive displacement piston pumps with controlled volume. The reciprocating motion provides a sinusoidal flow rate, therefore the flow of the pumped product is not continuous, but pulsating. The flow rate or volume of the pump is controlled by changing the stroke of the piston/diaphragm. The reciprocating motion of the piston/diaphragm of the dosing pump determines the flow thanks to directional valves located at the inlet and outlet of the pump head. The liquid is pumped in the following phases:
Sucking phase
During the suction phase, the valve at the outlet closes (sealing the leak), and the valve at the suction opens. Fluid enters the pump head chamber. The theoretical volume is equal to the piston displacement.
Stamping phase
During the compression phase, the suction-side valve closes and the discharge-side valve opens. The liquid leaves the pump head and flows into the pipe.
| Plunger dosing pumps | Doseuro A series
The SR-A series dosing pumps are plunger metering pumps with spring preload designed for water treatment and industrial applications. They are reliable and easy to maintain, with the option of a flushing or leak recovery system. Tapflo A series dosing pumps are ideal for applications where:
Want to know more? Check out Doseuro A dosing pumps. |
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| High-pressure plunger dosing pumps | Doseuro A series ‘HP’
The SR-A series dosing pumps are plunger metering pumps with spring preload designed for water treatment and industrial applications. They are reliable and easy to maintain, with the option of a flushing or leak recovery system. Tapflo A series dosing pumps are ideal for applications where:
Want to know more? Check out Doseuro A ‘HP’ high-pressure dosing pumps. |
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| Sandwich hydraulic diaphragm dosing pumps | Doseuro SD series
The SR series dosing pumps are spring-loaded sandwich hydraulic diaphragm dosing pump designed for water treatment and industrial applications. Tapflo SD series dosing pumps are ideal for applications where:
Want to know more? Check out Doseuro SD dosing pumps. |
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| Mechanical diaphragm dosing pumps | Doseuro FM series
The FM series dosing pumps are spring-loaded plunger pumps designed for water treatment and industrial applications. They are reliable and easy to maintain, with the option of a flushing or leak recovery system. Doseuro FM dosing pumps with a mechanical diaphragm are designed for pumping liquids with a low solid content. These devices are ideal for applications where:
Want to know more? Check out Doseuro FM dosing pumps.
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| Hydraulic diaphragm dosing pumps | Doseuro B/BR series
The B and BR series dosing pumps are hydraulic diaphragm dosing pumps designed for water treatment and industrial applications, for pumping liquids with low solid content in applications requiring high pressure. Tapflo B/BR series dosing pumps are ideal for applications where:
Want to know more? Check out Doseuro B/BR dosing pumps. |
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Each Doseuro D series dosing pump is equipped as standard with a reduction gear with a vertically mounted motor. The reduction gear is equipped with a worm gear and worm wheel, supported by a system of bearings immersed in an oil bath. |
| 1. Pump housing | Aluminum casting. |
| 2. Hydraulic pump head | It draws liquid from the inlet valve and pushes it through the discharge valve using a diaphragm made of PTFE/NBR. |
| 3. Regulation | The piston stroke from 0% to 100% is achieved by turning a knob on a screw, which partially regulates the return of the slider, both when the pump is stationary and in motion. Automatic adjustment is possible. |
| 4. Reducer assembly and gearbox | Reduces the motor speed to the number required for dosing by converting rotary motion into linear reciprocating motion using an eccentric shaft, with a slider and return spring. The transmission has a flexible coupling. |
| 5. Electric motor | Three-phase or single-phase (CVE – Ex – Gr. B14 – Cl. F- 50/60 Hz- IP 55 or higher). |
| Hydraulic elements | Plastic or metal depending on product compatibility. |
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The RAPIDA 2.0 system is a combination of a three-phase asynchronous electric motor and an inverter board, designed to enable motor speed control. Equipped with an LCD display, a control system and a multitude of functions that allow for immediate change of pump settings. Functions:
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Availability of the Rapida 2.0 system for individual Doseuro dosing pump models:
| Pomp model: | RAPIDA2.0 0.2 0.25 kW |
RAPIDA2.0 0.3 0.37 kW |
RAPIDA2.0 0.5 0.55 kW |
RAPIDA2.0 0.7 0.75 kW |
| D050N | – | – | – | |
| D100N | – | – | ||
| D101N | – | – | ||
| D121N | – | – | – | |
| D122N | – | – | ||
| A-B-BR-SD 125N | – | – | – | |
| A-B-BR-SD 175N | – | – | ||
| A-B-BR-SD 250N | – | – | ||
| A350N | – | – | – |


Safety valves
A safety valve is installed on the pump’s discharge pipe and is connected to the bypass pipe as a safety device, so that it opens (discharges) when the limit value is reached to protect the installation and pump from pressure overload.

Relief and check valves
A check valve is installed on the pump’s discharge line to counteract existing pressure on the suction side, in order to avoid siphoning. The use of this valve allows flow regulation in cases where the discharge pressure is low or non-existent.
A relief valve is installed on the pump’s discharge pipe and is connected to a bypass pipe as a safety device, so that it opens (discharges) when a limit value is reached in order to protect the system and pump from pressure overload.

Pulsation Dampeners – HSTX Type
316 stainless steel housing, consisting of two parts connected by a special closure, which under dynamic pressure tends to close automatically. Design compliant with ASME VIII° Div. 1. 1.

Pulsation Dampeners – HSTPVC Type
PVC body, consisting of two parts connected by a special hose, which under dynamic pressure tends to close automatically: + 50 °C. The membranes are compatible with the process liquid.

Polyethylene tanks
They are suitable for mounting with a dosing pump on top.

Calibration columns
A calibration column is installed on the suction line of a metering pump. It consists of a graduated cylinder. Its function is to determine the flow rate of the pump by checking the volume of liquid drawn in a given time, under actual operating conditions.
| Max. capacity | Qmaks. = 1400 l/h | |
| Max. discharge pressure: |
14 bars | |
| Temperature: | do 70 °C | |
| Motor power: | 0.09, 0.18, 0.25, 0.37, 0.55 or 0.75 kW, 1/3-phase, 1400 rpm | |
| Head material: | AISI 316L stainless steel, PP, PVC or PVDF | |
| Valve ball material: | AISI 316L stainless steel or “PYREX” glass | |
| Valve seat material: | AISI 316L stainless steel or PVDF | |
| Membrane material: | PTFE/NBR | |
| Valve O-ring Material: | FPM | |
| Connection types*: | ½”, ¾”, 1”, 1 ½” male BSP *other connection types available on request |
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