SPECIAL VERSIONS

Pump protection

Dry running protector / Pressure Switch

Materials:

• Lower housing
  • PP         max. 80 ºC
  • PVC      max. 60 ºC
  • PTFE    max. 120ºC
• Diaphragm EPDM, Viton or Viton/PTFE

Pressurerating:

• Max. line pressure  : 5 Bar
• Operating pressure : 0,1-2,0 Bar

It must be wired to an electro-magnetic relay which can either be incorporated in or linked to the switchbox controlling the power supply to the pump motor. It can be used with any single or 3 phase motor. Installation tees for mounting the switch unit in the pipeline can be supplied in all sizes in metal or plastics materials.

Cavitation or Dry Running

If cavitation occurs or the pump runs dry, the discharge pressure will drop; this actuates the pressure switch and, through the electro-magnetic relay, cuts the power supply to the pump. An adjustment screw, accessible beneath a cover on the head of the unit, enables the pressure switch to be set to operate at a given pressure drop. A minimum discharge pressure of 2m head is required. The pressure switch is designed for use with clean, non-crystallizing liquids.

For liquids containing particles in suspension or which are liable to crystallization, the unit can be supplied with an intermediate chamber containing a diaphragm through which line pressure changes are transmitted to the switch. The advantage of the intermediate chamber is that it has larger and less restricted surface areas open to the line fluid, thus significantly reducing the likelihood of blockage.

Diaphragm (switch) gauges

Visual monitoring system with optional safety cut-out

Technical details:

Flow control or Dry Running

Also available with contact switches (code MKM) for dry running protection of pumps or excess pressure control f.i. for filter systems. If the discharge pressure  is increasing or dropping, this actuates the pressure switch and, through the electro-magnetic relay, cuts the power supply to the pump. It must be wired to an electro-magnetic relay which can either be incorporated in or linked to the switchbox controlling the power supply to the pump motor.

The pressure switch is designed for use with clean, non-crystallizing liquids. For liquids containing particles in suspension or which are liable to crystallization, the unit can be supplied with an intermediate chamber containing a diaphragm through which line pressure changes are transmitted to the switch. The advantage of the intermediate chamber is that it has larger and less restricted surface areas open to the line fluid, thus significantly reducing the likelihood of blockage.

Ordering code

Priming Units

Applications

ARBO Priming units create self- priming capabilities for centrifugal pumps.By means of a specific calculation, the necessary volume for every typical priming application may be calculated. We offer a wide range of standard priming units but produce custom build units as well, even as big as 500 litre. Once filled, the pump will be capable of priming the suction line and releasing the air through the discharge line. In order to prime automatically every charge, it is necessary that the pump is switched off before it empties the priming unit. To ensure this and to protect your pump, we can advise on optional devices. 

Materials

Standard is the material PPH that covers a very wide range of duties. For highly corrosive mixtures at higher temperatures even a reservoir entirely made of PVDF may be offered. The standard priming unit has EPDM gaskets.

Recommended flow velocity in suction line   : 1 m/s

Ordering code

Non-return valves

• fully corrosion resistant PP,
• PVC or PVDF – no metal to liquid contact
• gaskets of EPDM (standard) or Viton
• with PTFE-encapsulated spring for maximum security
• absolutely leak free with clean liquids
• can be mounted horizontally or vertically in suction or discharge pipes of centrifugal pumps.
• Valve can be radially disassembled so piping can remain in position.
• Opening pressure 0.025 Bar

Suction strainers

Materials

Standard is the material PPH that covers a very wide range of duties. For highly corrosive mixtures at higher temperatures even a reservoir entirely made of PVDF may be offered. The standard priming unit has EPDM gaskets.

Dimensions

Ordering code

The iron catcher:

• optional available with magnetic inserts
• excellent to protect your
  • magnetic drive pump impellers and bearings
  • mechanical seal
• easy to dismantle and clean
• absolutely corrosion resistant