Polyvinylidene fluoride (PVDF)
Polyvinylidene fluoride (PVDF) is a highly crystalline, thermoplastic fluoroplastic with well-balanced mechanical properties. In comparison to PTFE, PVDF has significantly better rigidity and compressive strength. In addition, PVDF has high resistance to high-energy radiation and is considered to be physiologically inert. Furthermore, this plastic fulfils the highest cleanliness requirements, which is why it is used for applications in the chemical, food and semi-conductor industries. Thanks to its polar molecular structure, the electric and dielectric properties of PVDF are limited. Another advantage of PVDF is that it has high mechanical strength.
Special version
Backwash system/ball valve
For pumps with side housing made from plastic (PE and PTFE, also electrically conductive), the backwash system allows for the removal of residues from pipes and pumps. A bypass line is introduced into the side housing for the pump. The bypass line is opened via manual valves. Care should be taken to ensure that the manual valve is turned by max. 10 mm since the lift on manual valves is not limited. The bypass line can also be opened using pneumatically operated valves.
For this, a valve control pressure of at least 3.0 bar is required. For pumps with side housing made from metal (aluminium, grey cast iron and stainless steel), the backwash system allows for the removal of residues from pipes and pumps. To do this, the ball valves in the pump chamber are manually lifted on the draw and pressure sides. The backwash system/ball valve raising can automatically be activated when the pump is switched off if an optionally available 4/2-way valve is used.
The backwash system/ball valve raising is available in the following models: BF 1 – Backwash system with manual valve, EPDM seals for pump housings made from plastic and metal BF 2 – Backwash system with manual valve, PTFE seals for pump housings made from plastic and metal BF 3 – Backwash system with manual valve, FPM seals for pump housings made from plastic and metal BF 4 – Backwash system with pneumatic valve, EPDM seals for pump housings made from plastic BF 5 – Backwash system with pneumatic valve, PTFE seals for pump housings made from plastic
For this, a valve control pressure of at least 3.0 bar is required. For pumps with side housing made from metal (aluminium, grey cast iron and stainless steel), the backwash system allows for the removal of residues from pipes and pumps. To do this, the ball valves in the pump chamber are manually lifted on the draw and pressure sides. The backwash system/ball valve raising can automatically be activated when the pump is switched off if an optionally available 4/2-way valve is used.
The backwash system/ball valve raising is available in the following models: BF 1 – Backwash system with manual valve, EPDM seals for pump housings made from plastic and metal BF 2 – Backwash system with manual valve, PTFE seals for pump housings made from plastic and metal BF 3 – Backwash system with manual valve, FPM seals for pump housings made from plastic and metal BF 4 – Backwash system with pneumatic valve, EPDM seals for pump housings made from plastic BF 5 – Backwash system with pneumatic valve, PTFE seals for pump housings made from plastic
Buffer chamber system
The buffer chamber system with diaphragm monitoring is available in the following models: BC 1 – Buffer chamber system with diaphragm monitoring, with sensors BC 2 – Buffer chamber system with diaphragm monitoring, with sensors and switching device BC 3 – Buffer chamber system with diaphragm monitoring, with sensors, switching device and an intrinsically safe isolating amplifier (potentially explosive areas)
Note: The maximum permissible operating temperature for pumps with buffer chamber system with diaphragm monitoring is +70 °C for PE pumps and +80 °C for PTFE pumps.
Note: The maximum permissible operating temperature for pumps with buffer chamber system with diaphragm monitoring is +70 °C for PE pumps and +80 °C for PTFE pumps.
Stroke counting
A contactless sensor (proximity sensor) is installed in the motor housing. This registers every second stroke of the diaphragm in the pump chamber. This type of stroke counting is independent from the operation mode of the pump. The signals from the sensor can, for example, be transmitted to an available control unit or an optionally available stroke counter. The strokes for the pump can be pre-defined via the stroke counter.
Once the preset stroke rate is reached, the pump is switched off using a likewise optionally available solenoid valve. The strokes can also be captured pneumatically using a pressure sensor. Here, the pressure change in the motor housing is measured behind a diaphragm.
Stroke counters are available in the following models: SC 1 – Proximity sensor (Namur) with approx. 3.0 m connection cable SC 2 – Proximity sensor (Namur) with stroke counter SC 3 – Proximity sensor (Namur) with stroke counter and intrinsically safe isolating amplifier in accordance with potentially explosive areas SC 5 – Pressure switch (1.0 – 10.0 bar) with approx. 5.0 m connection cable SC 6 – Pressure switch (1.0 – 10.0 bar) with stroke counter
Note: If the proximity sensor (SC 1) is used in a potentially explosive area, an intrinsically safe isolating amplifier should also be provided.
Once the preset stroke rate is reached, the pump is switched off using a likewise optionally available solenoid valve. The strokes can also be captured pneumatically using a pressure sensor. Here, the pressure change in the motor housing is measured behind a diaphragm.
Stroke counters are available in the following models: SC 1 – Proximity sensor (Namur) with approx. 3.0 m connection cable SC 2 – Proximity sensor (Namur) with stroke counter SC 3 – Proximity sensor (Namur) with stroke counter and intrinsically safe isolating amplifier in accordance with potentially explosive areas SC 5 – Pressure switch (1.0 – 10.0 bar) with approx. 5.0 m connection cable SC 6 – Pressure switch (1.0 – 10.0 bar) with stroke counter
Note: If the proximity sensor (SC 1) is used in a potentially explosive area, an intrinsically safe isolating amplifier should also be provided.
Solenoid control (Namur)
Dellmeco pumps can be equipped with the “MV” option. The automatic control valve is replaced with a 5/2-way solenoid valve. The number of strokes is controlled by this solenoid valve. This option requires a voltage of 24V DC.
High-pressure variants
High pressure pumps are particularly suitable for use in the following areas of application:
Dellmeco HP pumps distinguish themselves in that they have a self-regulating design and thus do not require any regulation with regard to dry running, excess pressure or speed. There are also no rotating components, of course, resulting in a particularly gentle material delivery.
- Coating of chamber filter presses
- Coating of spray nozzles
- Delivery of high viscosity media
- Paint lines
- Overcoming large pump heights
Dellmeco HP pumps distinguish themselves in that they have a self-regulating design and thus do not require any regulation with regard to dry running, excess pressure or speed. There are also no rotating components, of course, resulting in a particularly gentle material delivery.
Accessories
Compressed air regulator / filter regulator
The pressure filter regulator, also known as the maintenance unit, is used in order to regulate the pressure of the pump and to set the delivery capacity of the pump.
In addition, this regulator has a moisture separator and a fine filter in order to keep water and dirt away from the compressed air components in the pump.
It is available in three sizes in order to reasonably operate any pump size. A needle valve for precise fine regulation of the delivery capacity from 0-100% is optionally available.
In addition, this regulator has a moisture separator and a fine filter in order to keep water and dirt away from the compressed air components in the pump.
It is available in three sizes in order to reasonably operate any pump size. A needle valve for precise fine regulation of the delivery capacity from 0-100% is optionally available.
Diaphragm barrel pump
The selected pump is supplied with metal housing and ergonomic handles made from stainless steel (product code D) and has approval in accordance with EN 94/9/EC (EX II 2GD TX). It is therefore suitable for use as a barrel pump for 200 | DIN barrels and IBC containers. This accessory is designed for a maximum delivery capacity of up to 7.5 m3/h (DM25). The suction pipe is made from stainless steel.
In order to ensure optimal resistance against the media to be delivered, Dellmeco barrel pumps are made from the following materials: PE, conductive PE, PTFE, conductive PRFE, aluminium and stainless steel (AISI 316). Our barrel pumps can be used up to a viscosity of 12,000 mPas.
Barrel pumps are available in nominal widths of 3/8”, 1/2”, 3/4” and 1”. The standard lengths of the suction pipes are 1.0 m or 1.2 m.
Suction pipe materials:
In order to ensure optimal resistance against the media to be delivered, Dellmeco barrel pumps are made from the following materials: PE, conductive PE, PTFE, conductive PRFE, aluminium and stainless steel (AISI 316). Our barrel pumps can be used up to a viscosity of 12,000 mPas.
Barrel pumps are available in nominal widths of 3/8”, 1/2”, 3/4” and 1”. The standard lengths of the suction pipes are 1.0 m or 1.2 m.
Suction pipe materials:
- Polypropylene
- PTFE
- Aluminium
- Stainless steel (AISI 316)
Pulsation damper
When operating compressed air driven double diaphragm pumps (positive displacement pumps), a pulsating delivery flow results from the oscillating movement of the diaphragm. In order to achieve an almost uniform delivery flow, the use of a suitable active pulsation damper is mandatory.
The Dellmeco F range is a specially developed pump with integrated pulsation damper and two separate product chambers. The first product chamber is used for delivering a liquid from a reservoir to the system. This chamber works by using a directly installed and actively controlled pulsation damper. The product flow is thus delivered evenly. An air pressure of at least 1 bar is required for perfect use of the pulsation damper.
The second chamber is used for returning the excess product (e.g. colour, glue, adhesive, etc.) from the system to the reservoir. The second chamber can also be used for circulating the product in the reservoir. The quick sedimentation of a product can thereby be prevented.
When using Dellmeco pumps with plastic housing, the pulsation damper is screwed directly onto the material outlet without the use of further components. When using pumps with metallic housing, the pulsation damper is installed downstream from the pump. Each pulsation damper has a separate compressed air connection. Pumps and pulsation dampers should be connected to the compressed air supply together so that both units are supplied with the same air pressure. As soon as the pump is supplied with air pressure and begins delivery, the pulsation also begins reducing the pulsation. The diaphragm in the pulsation damper, as in the double diaphragm pumps, serves as a separating membrane between the air side and the product side. If the air pressure is reduced or increased as a result of modified operating conditions, the pressure on the delivery side is also reduced or increased. This occurs both in the pump and in the pulsation damper. Consistently good damping of the pulsation is achieved, caused by this automatic adjustment of the pressure. Use in potentially explosive areas (EX II 2GD TX) is assured through the use of conductive polyethylene as the housing material.
The Dellmeco F range is a specially developed pump with integrated pulsation damper and two separate product chambers. The first product chamber is used for delivering a liquid from a reservoir to the system. This chamber works by using a directly installed and actively controlled pulsation damper. The product flow is thus delivered evenly. An air pressure of at least 1 bar is required for perfect use of the pulsation damper.
The second chamber is used for returning the excess product (e.g. colour, glue, adhesive, etc.) from the system to the reservoir. The second chamber can also be used for circulating the product in the reservoir. The quick sedimentation of a product can thereby be prevented.
When using Dellmeco pumps with plastic housing, the pulsation damper is screwed directly onto the material outlet without the use of further components. When using pumps with metallic housing, the pulsation damper is installed downstream from the pump. Each pulsation damper has a separate compressed air connection. Pumps and pulsation dampers should be connected to the compressed air supply together so that both units are supplied with the same air pressure. As soon as the pump is supplied with air pressure and begins delivery, the pulsation also begins reducing the pulsation. The diaphragm in the pulsation damper, as in the double diaphragm pumps, serves as a separating membrane between the air side and the product side. If the air pressure is reduced or increased as a result of modified operating conditions, the pressure on the delivery side is also reduced or increased. This occurs both in the pump and in the pulsation damper. Consistently good damping of the pulsation is achieved, caused by this automatic adjustment of the pressure. Use in potentially explosive areas (EX II 2GD TX) is assured through the use of conductive polyethylene as the housing material.
Diaphragm monitoring
A moisture sensor (capacitive) is installed in the pump’s silencer. This sensor detects any liquid which inevitably gets into the pump motor in the event of a diaphragm rupture. The sensor’s output signal can be transmitted to an available programmable memory controller or an optionally available control unit.
If the sensor transmits an alarm signal, this alarm can be transmitted to a likewise optionally available solenoid valve. The solenoid valve shuts of the air supply. The pump stops.
Note: If the pump is operated with an upstream moisture separator (filter regulator), damp compressed air can lead to triggering of the sensor (alarm). It is therefore mandatory to install an optionally available moisture separator (filter regulator) before the pump. If diaphragm monitoring (DM1, DM2) is used in a potentially explosive area, an intrinsically safe isolating amplifier should also be provided in addition to the proximity sensor.
Diaphragm monitoring is available in the following models: DM 1 – Moisture sensor, capacitive (Namur) with approx. 3.0 m connection cable DM 2 – Moisture sensor, capacitive (Namur) with control unit
If the sensor transmits an alarm signal, this alarm can be transmitted to a likewise optionally available solenoid valve. The solenoid valve shuts of the air supply. The pump stops.
Note: If the pump is operated with an upstream moisture separator (filter regulator), damp compressed air can lead to triggering of the sensor (alarm). It is therefore mandatory to install an optionally available moisture separator (filter regulator) before the pump. If diaphragm monitoring (DM1, DM2) is used in a potentially explosive area, an intrinsically safe isolating amplifier should also be provided in addition to the proximity sensor.
Diaphragm monitoring is available in the following models: DM 1 – Moisture sensor, capacitive (Namur) with approx. 3.0 m connection cable DM 2 – Moisture sensor, capacitive (Namur) with control unit
Pneumatic mixing and filling pump
Operation This system can be used for the delivery and mixing of liquids. It is simply inserted into the container’s bung hole. With this refined system, you save on additional mixing devices and thus on space and energy. The pneumatic mixing and filling pump is available in stainless steel (AISI 316L).
Mixing mode In order to implement mixing mode, the ball valve on the pressure side must be closed and the ball valve in the circulation pipe must be open.
Delivery mode In order to implement delivery mode, the ball valve on the pressure side must be open and the ball valve in the circulation pipe must be closed.
Mixing mode In order to implement mixing mode, the ball valve on the pressure side must be closed and the ball valve in the circulation pipe must be open.
Delivery mode In order to implement delivery mode, the ball valve on the pressure side must be open and the ball valve in the circulation pipe must be closed.