NExa

HYDRAULIC DOUBLE-DIAPHRAGM HEADS
A trustworthy solution for applications requiring the highest levels of operational accuracy and reliability. The features include:

  • Hydraulic oil-operated diaphragms
  • Double oil for hydraulics and mechanism lubrication ensuring 100% chemical tightness and operational safety for higher reliability, dosing accuracy and application flexibility
  • Preformed PTFE diaphragms as standard, for an excellent chemical compatibility and increased compactness allowing an outstanding level of efficiency
  • Sealed design for metering hazardous fluids such as toxic or corrosive solutions and protection against external contamination
  • Mechanical replenishment system maintains a constant level of the hydraulic fluid, thereby guaranteeing maximum precision and repeatability and enabling diaphragms deformation control for extended life
  • Standard wetted parts include 316L stainless steel, PP and PVDF, with other materials available upon request

Diaphragm rupture detector available in multiple options:

  • Exakta standard local visual
  • Local visual via pressure gauge
  • Pressure switch (any make, model or case material and signal type: analogue 4 – 20 mA, digital, HART protocol)
  • Pressure transmitter (any make, case material and signal type: analogue 4 – 20 mA, digital, HART protocol)

B Type - Max Pressure 450 barg

Head Size

Flow Rate Max [l/h]

Fluid Temperature [°C]

Viscosity [cPs]

Material

AH

0.7

-10 / 70

500

316L SS

B2

14

-10 / 70

500

316L SS

C2

103

-10 / 70

500

316L SS

H Type - Max Pressure 200 barg

Head Size

Flow Rate Max [l/h]

Fluid Temperature [°C]

Viscosity [cPs]

Material

A

2.45

-10 /130

1000

316L SS

B

17

-10 /130

1000

316L SS

C

93

-10 /130

1000

316L SS

C (LT)

93

-40 /70

1000

316L SS

D1

81

-10 /130

500

316L SS

D2

377

-10 /130

500

316L SS

E2

612

-10 /130

500

316L SS

D2

510

-10 /130

500

316L SS

E2

1068

-10 /130

500

316L SS

T Type - Max Pressure 120 barg

Head Size

Flow Rate Max [l/h]

Fluid Temperature [°C]

Viscosity [cPs]

Material

B

9.84

-10 /130

1000

316L SS

C

80

-10 /130

1000

316L SS

C (LT)

80

-40 /70

1000

316L SS

D1

163

-10 /130

1000

316L SS

D2

299

-10 /130

500

316L SS

E2

1652

-10 /130

500

316L SS

Y Type - Max Pressure 40 barg

Head Size

Flow Rate Max [l/h]

Fluid Temperature [°C]

Viscosity [cPs]

Material

B

33

-10 /130

1000

316L SS

D

274

-10 /130

1000

316L SS

E1

709

-10 /130

1000

316L SS

E1

1015

-10 /130

500

316L SS

G

3891

-10 /130

500

316L SS

H

6883

-10 /130

500

316L SS

I

9370

-10 /130

500

316L SS

Y Type - Max Pressure 20 barg for plastic head

Head Size

Flow Rate Max [l/h]

Fluid Temperature [°C]

Viscosity [cPs]

Material

C

74

-5 /50

1000

PP-PVDF

D

545

-5 /50

1000

PP-PVDF

E1

863

-5 /50

1000

PP-PVDF

These are limit values, please state actual conditions with enquiry.