Pump protection

In order to minimise maintenance cost and process losses, we strongly recommend to install some monitoring and protecting systems that we offer optional to your ARBO product:


  1. Dry running protection
  2. Pressure gauges
  3. Priming units/ Non-return valves
  4. Suction strainers

Pump protection

All products are machined of massive PP that covers a very wide range of duties – there is no metal to liquid contact. All reinforcement parts are made of SS-316.

For highly abrasive liquids (high % of solids) parts of High modulus HMPE may be ordered.

For highly corrosive mixtures at higher temperatures virgin PVDF is available

Materials of construction Abbreviation T min. oC T max. oC
Polypropylene PP 0 80
High Modulus Polyethylene HMPE -50 80
Polyvinylidenfluoride PVDF -30 120
Polytetrafluorethene PTFE -30 120

 

Materials of elastomers Abbreviation T min. oC T max. oC
EPDM E -40 150
Viton V -25 220
Polytetrafluorethene T -190 260

 

Materials of connections Abbreviation
Male straight pipe thread R
DIN2501 PN10 Flanges F
3-D Unions +GF+ U

Pump protection

Dry running protector / Pressure Switch

High and low pressure safety cut- out

This compact, easily fitted pressure switch can be wired into control circuits or contactors to provide high or low pressure safety cut-out.

Alternatively, it can be wired to give an audible or visual high or low pressure alarm. 

It is ideal for the protection of pumping equipment, which can be damaged by cavitation, dry running or pressure build-up.

The unit, which contains a diaphragm operated pressure switch, is mounted in the discharge pipe close to the pump by means of a tee fitting with a female threaded branch. 

Materials:

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


Pressure rating:

  • 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

The ARBO diaphragm gauge can be used for neutral or corrosive media. All wetted parts are made of highly corrosion resistant plastics or stainless steel. There is no contact between gauge and liquid.

The gauge is separated from the chemical by a diaphragm. Pressure transmission takes place by means of a buffer solution. The large diaphragm area in combination with the tiny compressibility of the buffer solution provides a very accurate indicationThe unit, is mounted in the discharge pipe close to the pump by means of a tee fitting with a male 1/2 “threaded branch. Thanks to the special design, the gauge can be rotated 360o in order to put it in the best  reading position.

Technical details:

Available materials:   
Diaphragm housing  PP, PVDF 
Diaphragm/other gaskets  PTFE covered 

 

Max. operating temperature:  
PP 0 to +80°C 
PVDF  -40 to +120°C 

 

Max. operating pressure  PN 4 
Connections R ½" inner
  R 1” or
  R 1¼" outer
Ranges 0-4 Bar


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

Model 

Pressure range Bar 

Material wetted parts 

Gaskets 
Outer threaded connection "R"
MM 0-4 PP E 1/2
MMO   PVDF V 1
MKM     T 1 1/4
MKMO        


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.

Pos. Description Standard Alternatives
1 Non-return valve PPH PVDF PVC PE
2 Transparent filler opening PPH PVDF PVC PE
3 Air release valve with hose adaptor for re- circulation line PPH PVDF
4 Diaphragm gauge PPH PVDF
5 Drain valve instead of plug PPH PVDF

Max. operating pressure at 20°C   :  -0.8 to 2 Bar

Recommended flow velocity in suction line   : 1 m/s

Materials of construction Abbreviation T min. oC T max. oC
Polypropylene PP 0 80
Polyvinylidenfluoride PVDF -30 120
Polytetrafluorethene PTFE -30 120

 

Materials of elastomers Abbreviation T min. oC T max. oC
EPDM E -40 150
Viton V -25 220
Polytetrafluorethene T -190 260

 

Materials of connections Abbreviation
DIN2501 PN10 Flanges F
3-D Unions +GF+ U
Table of dimensions (L=Liter)
Type/ dim. 15L 25L 30L 40L 60L 80L
a 430 630 800 530 780 1060
b 300 500 670 400 650 930
c 320 320 320 440 440 440
d 340 340 340 460 460 460
g 490 490 490 610 610 640

 

Ordering code

Model  Volume (L)  Type of connection  Connection S1  Connection S2  Material wetted parts  Gaskets 
AZU 15 F Dn25 Dn25 PP E
  20 U Dn32 Dn32 PVDF V
  25   Dn40 Dn40 PVC* T
  30   Dn50 Dn50 PE*  
  40   Dn65 Dn65    
  60   Dn80 Dn80    
  80   Dn125 Dn125    
  225   Dn150 Dn150    

 

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

       

SumPro DO-BG1-2-3 d 50 DN 40
SumPro DO-BG4-5 d 50 DN 40
DO-32/40/50-160/200/250-HD d 75 DN 65
DO-65-200/250-HD d 90 DN 80

Suction strainers

Applications

ARBO suction strainers are primarily used to protect pumps against foreign particles.This can prevent serious damage of your pumps and will therefore reduce maintenance cost and process down time.

All ARBO strainers are all designed under consideration of the recommended maximum flow velocity for centrifugal pumps.

The pressure drop over the strainer basket is very low, therefore ARBO strainers are well suitable for processes with higher liquid temperatures and low NPSH situations.

We offer a wide range of standard units but produce custom build units as well. For situations where a limited suction lift is required, this unit may be suitable as well. Please consult our sales department for a specific calculation and quote.

 

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.

Materials of construction Abbreviation  T min. oC T max. oC
Polypropylene PP 0 80
Polyvinylidenfluoride PVDF -30 120



Materials of elastomers Abbreviation T min. oC T max. oC
EPDM E -40 150
Viton V -25 220
Polytetrafluorethene T -190 260
Materials of connections Abbreviation
DIN2501 PN10 Flanges F

 

Dimensions

Type m3/h S1 S2 *S2 All dimensions in mm priming
Dn max. Dn Dn min. max. a b c d e f g h j k m n o volume L
40 6 40 40 80 230 225 470 235 235 343 569 337 285 3x09 PDC.262 60 145 18 4 x 9,3
50 10 50 50 90 220 225 470 235 235 343 569 337 285 3x09 PDC.262 60 145 18 4 x 9,1
65 20 65 65 100 215 225 470 235 235 343 569 337 285 3x09 PDC.262 60 145 18 4 x 8,9
80 30 80 80 105 210 225 470 235 235 353 589 337 285 3x09 PDC.262 60 145 18 4 x 8,9
100 40 100 100 115 200 225 470 235 235 353 589 337 285 3x09 PDC.262 60 145 18 4 x 8,6
125 60 125 125 115 200 225 470 235 235 408 668 337 285 3x09 PDC.262 60 145 18 4 x 8,6
150 90 150 150 150 200 315 551 258 258 408 668 427 385 6x09 PDC.355 60 145 18 6 x 18,8
200 160 200 200 200 600 400 760 380 380 784 1082 511 460 6x09 PDC.437 100 145 49 8 x 70

 

Ordering code

Product   S1 Inlet S2 Outlet Material wetted parts Gaskets
Strainer Dn40 Dn40 PP E
  Dn50 Dn50 PVDF V
  Dn65 Dn65   T
  Dn80 Dn80    
  Dn100 Dn100    
  Dn125 Dn125    
  Dn150 Dn150    
  Dn200 Dn200    

 

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
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