SR Series
 Type A

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  • Manually adjustable output with spring return function
     
  • Continuously rated for operation in the harshest environments
     
  • Suitable for use with non-abrasive solutions where a drip proof system is not essential
     
  • Available in many different materials of construction including PVC, PTFE, PVDF and Stainless Steel to suit most chemicals
     
  • Output capacities up to 1458 litres/hr
     
  • Higher outputs available via multiple headed pumps
     
  • Pressures up to 150 bar (2,175 psi)

Technical Features

All pumps are fitted as standard with gearbox reduction system and with vertically mounted V18 shaped electric motor that conform to the UNEL-MEC specifications. The motor's power range is from 0.18 kW up to 0.55 kW at European standard 3 phase voltages of 230/400V @ 50Hz, 4 poles.

The motors conform to the UNEL-MEC specifications and are available with different voltages, frequencies, insulation standards and special explosion proof versions.

The gearbox utilises a worm-wheel reduction system with all bearings fully supported within the fully lubricated gearbox.

The manually adjustable output with spring return is operated by micrometer type stroke limiter, which adjusts the piston delivery stroke (output), while the suction stroke (reload) is spring assisted.

Capacity adjustment can be effected whilst in operation or at rest. The movement of the piston is controlled by a precise reciprocating gearbox which ensures an accurate and repeatable volumetric displacement.

Automatic remote flow control adjustment is also available by means of servo control units, with 4-20mA control signal, or by means of a 3 - 15 psi pneumatic control signal.

The simple build configuration and a small number of component parts allow an easy checking and maintenance.

Spring Return Piston Metering Pumps
Max 1458 Ltrs/hr

Materials of Construction Codes

TYPE

PUMPING HEAD

PISTON

 VALVES (balls) VALVE SEATS PISTON GASKETS
11 AISI 316 AISI 316 AISI 316 AISI 316 NBR
13 PVC CERAMIC PYREX PVC FPM
14 AISI 316 AISI+OSS.CR. AISI 316 AISI 316 PU
17 AISI 316 CERAMIC AISI 316 AISI 316 FPM
19 AISI 316 AISI 316 AISI 316 AISI 316 FPM
20 PVC AISI 316 PYREX PVC NBR
21 AISI 316 AISI 316 AISI 316 AISI 316 PTFE
23 PVC CERAMIC PYREX PVC PTFE

Product Code Description

A series Piston pumps are available in four different sizes:

   A 125 N - Max 156 Ltrs/hr
   A 175 N - Max 408 Ltrs/hr
   A 250 N - Max 1042 Ltrs/hr
   A 350 N - Max 1458 Ltrs/hr

For these four types 11 different piston sizes are available to suit each clients' applications for capacity and pressure.

Piston metering pumps are suitable for use when:

   The dosed liquid is a non abrasive solution.

   A drip proof system is not essential.

   High pressure dosing is required

 Standard materials of pump-head construction:
AISI 316 Stainless steel and PVC.
Available in many different materials of construction to suit the chemicals in use.

Jacketed pump-heads for either cooling or heating are available to suit requirements. Piston glan arrangements can be supplied with water washed seals to continuously flush the piston.

Piston seals are of the lip seal type design, but "V" type seals are also available in PTFE.

Valves

Heads

All pumps are fitted as standard with gearbox reduction system and with vertically mounted V18 shaped electric motor that conform to the UNEL-MEC specifications.

The motor's power range is from 0.18 kW up to 0.55 kW at European standard 3 phase voltages of 230/400V @ 50Hz, 4 poles.

Multiple Headed Pumps

Different multiple heads units are available on request.  Each pumping element is independently adjustable both in operation or at rest.

Pump Model Specifications

A125N
 
Pump type Reducer ratio Stroke Number  (*1) Capacity (*2) Max Pressure (*3) Connections (*4) Motor ø mm Effective Stroke
Net Weight Kg (*5)
L/1' L/h Kg/cm2
  (*1) 50 Hz 60 Hz 50 Hz 60 Hz 50 Hz 60 Hz SS 316 PVC SS 316 PVC Options Piston Length SS 316 PVC
 A-125N-  6 F 58 70 0,013 0,017 0,8 1,0 20 10 1/2" G.m.  0.18 kW
3 Ph ~
1400 rpm
 

or 
0.18 kW
1 ph ~
1400 rpm

 6 12.5 mm 8,5 7,5
C 96 116 0,022 0,027 1,3 1,6
B 116   0,027   1,6  
  A-125N-   11 I 35 42 0,040 0,047 2,4 2,8 11.11 8,5 7,5
F 58 70 0,066 0,080 4 4,8
C 96 116 0,110 0,133 6 8
B 116   0,133   8  
  A-125N-   17 I 35 42 0,1 0,120 6 7,2 17.46 8,5 7,5
F 58 70 0,166 0,200 10 12
C 96 116 0,273 0,330 16 20
B 116   0,330   20  
  A-125N-   25 I 35 42 0,221 0,264 13,2 15,8 20 25.4 8,5 7,5
F 58 70 0,366 0,440 22 26,4
C 96 116 0,604 0,733 36 44
B 116   0,733   44  
  A-125N-   30 I 35 42 0,311 0,374 18,7 22,4 14 30.16 8,5 7,5
F 58 70 0,516 0,620 31 37,2
C 96 116 0,854 1,033 51 62
B 116   1,033   62  
  A-125N-   38 I 35 42 0,502 0,600 30 36 9 38.1 9,5 8
F 58 70 0,833 1,000 50 60
C 96 116 1,373 1,660 82 100
B 116   1,660   100  
  A-125N-   47 I 35 42 0,784 0,940 47 56 5.5 47.63 9,5 8
F 58 70 1,300 1,560 78 93,6
C 96 116 2,150 2,600 129 156
B 116   2,600   156  

(*1) Piston's strokes per 1 minute with 4 poles installed motor
I = Reducer ratio 1 : 40 = 35 strokes at 50 Hz / 42 strokes at 60 Hz
F = Reducer ratio 1 : 24 = 58 strokes at 50 Hz / 70 strokes at 60 Hz
C = Reducer ratio 1 : 14,5= 96 strokes at 50 Hz / 116 strokes at 60 Hz
B = Reducer ratio 1 : 12 = 116 strokes at 50 Hz
(*2) The indicated capacity value is subject to change due to the working pressure, the dosed liquid, the viscosity and the installation asset.
(*3) Higher pressures are available.
(*4) If requested, different range of connections are available.
(*5) The weight is approximate and reflects the pump fitted with a totally enclosed fan-cooled outdoor motor.
(6) The pumps can be supplied with accessories if requested.
(7) The pumps are painted with a 2 part EPOXY-POLYAMIDE PAINT RAL 7030.

A175N
 
Pump type Reducer ratio Stroke Number (*1)' Capacity (*2) Max Pressure (*3) Connections   (*4) Motor ø mm Effective Stroke Net Weight Kg (*5)
L/1' L/h Kg/cm2
  (*1) 50 Hz 60 Hz 50 Hz 60 Hz 50 Hz 60 Hz SS 316 0.34 HP SS 316 0.5 HP PVC SS 316 PVC Options Piston Length SS 316 PVC
A-175N - 6 F 70 84 0,021 0,026 1,3 1,56 20 // 1/2" G.m. 0.25 kW
3 Ph
~1400 rpm
 

or
0.25 kW
1 ph
~1400 rpm

 6 17.5 11 10
C 96 116 0,029 0,035 9,7 2,11
B 120   0,036   2,2  
A-175N - 11 F 70 84 0,100 0,120 6 7,2 10 11.11 11 10
C 96 116 0,133 0,160 8 9,6
B 120   0,166   10  
A-175N - 17 F 70 84 0,283 0,340 17 20,4 17.46 11 10
C 96 116 0,400 0,480 24 28
B 120   0,500   30  
A-175N - 25 F 70 84 0,616 0,740 37 44,4 25.4 11 10
C 96 116 0,853 1,024 51 61,4
B 120   1,066   64  
A-175N - 30 F 70 84 0,866 1,400 52 62,4 20 20 30.16 11 10
C 96 116 1,200 1,440 72 86
B 120   1,500   90  
A-175N - 38 F 70 84 1,383 1,660 83 99,6 13 20 38.1 12 10,5
C 96 116 1,920 2,304 115 138
B 120   2,400   144  
A-175N - 47 F 70 84 2,166 2,600 130 156 8.5 13 8.5 47.63 12 10,5
C 96 116 3,013 3,615 180 216
B 120   3,766   226  
A-175N - 54 F 70 84 2,800 3,360 168 201,6 6.5 10 6.5 3/4" G.m. 53,98 15.5 12
C 96 116 3,866 4,640 232 278
B 120   4,830   290  
A-175N - 64 F 70 84 3,933 4,720 236 283,2 4.5 7 4.5 63.5 16 12.5
C 96 116 5,440 6,528 326 391
B 120   6,800   408  

(*1) Piston strokes per 1 minute with 4 poles installed motor
F = Reducer ratio 1 : 20 = 70 strokes at 50 Hz / 84 strokes at 60 Hz
C = Reducer ratio 1 : 14,5 = 96 strokes at 50 Hz / 116 strokes at 60 Hz
B = Reducer ratio 1 : 1 = 120 strokes at 50 Hz
Notes: See next page

A250N
 
Pump type Reducer ratio Strokes number (*1) Capacity (*2) Max Pressure (*3) Connections (*4) Motor ø mm Effective Stroke Net Weights Kg (*5)
L/1' L/h Kg/cm2
  (*1) 50 Hz 60 Hz 50 Hz 60 Hz 50 Hz 60 Hz SS 316 CV 0.75 SS 316 CV 1 PVC SS 316 PVC Options  Piston Length SS 316 PVC
A-250N- 25 F 56 67 0,716 0,860 43 51,6 20 // // 1/2 " G.m. 0.55 kW
or
0.75 kW
3 Ph ~
1400 rpm
 

or
0.55 kW
or
0.75 kW
1 ph ~
1400 rpm

 25,4 25 21 //
C 96 116 1,228 1,474 73 88
B 112   1,433   86  
A-250N- 38 F 56 67 1,600 1,920 96 115,2 20 34 // 38,1 23 17
C 96 116 2,743 3,290 164 197,5
B 112   3,200   192  
A-250N- 47 F 56 67 2,500 3,000 150 180 17 22 10 3/4"  G.m. 47,63 23 17
C 96 116 4,285 5,142 257 308
B 112   5,000   300  
A-250N- 54 F 56 67 3,200 3,840 192 230,4 13 17 10 53,98 23.5 17.5
C 96 116 5,485 6,582 329 295
B 112   6,400   384  
A-250N- 64 F 56 67 4,433 5,320 266 319,2 9,5 12 9.5 1" G.m. 63,5 25.5 20
C 96 116 7,600 9,120 456 547,2
B 112   8,860   532  
A-250N- 76 F 56 67 6,383 7,660 383 459,6 6,5 8,6 6.5 76,2 26 20
C 96 116 10,943 13,131 656 787,8
B 112   12,760   766  
A-250N- 89 F 56 67 8,683 10,420 521 625,2 4,8 6,3 4.8 88,9 29 20
C 96 116 14,885 17,862 893 1071,7
B 112   17,360   1042  

(*1) Piston strokes per 1 minute with 4 poles installed motor
F = Reducer ratio 1 : 25 = 56 strokes at 50 Hz / 67 strokes at 60 Hz
C = Reducer ratio 1 : 14,5 = 96 strokes at 50 Hz / 116 strokes at 60 Hz
B = Reducer ratio 1 : 12,5 = 112 strokes at 50 Hz
(*2) The indicated capacity value is subject to changes due to the working pressure, the dosed liquid, the viscosity and the installation asset.
(*3) Higher pressures are available.
(*4) If requested, different range of connections are available.
(*5) The weight is approximate and reflects the pump fitted with a totally enclosed fan-cooled outdoor motor.
(6) The pumps can be supplied with accessories if requested.
(7) The pumps are painted with a 2 part EPOXY-POLYAMIDE PAINT RAL 7030.