Hygiene Doppelmembranpumpe

Hygienic double diaphragm pumps (AISI 316L)

The hygienic double diaphragm pumps from Dellmeco are FDA approved thanks to the smooth diaphragm surface since the TFM prevents the growth of bacteria and germs. In addition, all components which come into contact with the media are made from stainless steel and thus meet the standards of the food and pharmaceutical industries. If you need special surface treatments, these are available upon request.

The air valves used are completely oil and grease-free since our pneumatic motor does not require any lubricated compressed air or permanent lubrication. In addition, our joint bracket system allows for quick removal without the need for tools thanks to the clamping connection. Of course, our hygienic double diaphragm pump is also CIP and SIP enabled. Our pumps are available with a variety of connections, beginning with the various pipe fillings in accordance with DIN 11850, DIN 11864-1 or ANSI. Flange connections in accordance with ANSI or DIN 11864-2 aseptic are also not a problem. In addition, we also offer clamping connections (TC) in accordance with DIN 11864-3, aseptic and ANSI, as well as SMS and RJT connections.

Mobile hygienic pumps
All Dellmeco pumps are available as mobile pumps. In order to address the requirements of the food and pharmaceuticals industries, the trolley is made from stainless steel for the hygienic pumps. Naturally, all accessories (filter regulators, hose holders) needed for operation of the pumps can be mounted on the transport trolley.

Heating jacket
For a multitude of delivery tasks, it is necessary for a product to be heated or cooled. For these applications, the side sections as well as the materials inlets and outlets can be heated or cooled. Either warm water, steam or heat transfer oil can be used in order to heat the pump. The maximum permissible operating temperature is -30 °C to +120 °C.

 


special versions

Our double diaphragm pumps are available with various additional options and in a variety of models.
We are happy to help you in making your selection and to provide you with individual and application-oriented advice:

 

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.
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.
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

accessories

We offer the following optional accessories for this product range:

 

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
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.