NEXA SERIES
Double-diaphragm and packed plunger pumps with full motion mechanisms
OVERVIEW
Nexa’s exceptional build quality enables stable dosing even under extreme operating pressures and temperatures, from wellhead chemical injection in oil and gas applications to pyrophoric liquids handling in chemical compounds manufacturing.

Designed to meet API 675 3rd edition standard and compliant to Norsok M-501 & M-630, NACE 0175, ATEX2014/34/EU, TR CU 004-010-020-012/2011 and Shell DEP (various), Nexa can be safely operated in hazardous processes, reassuring operators of the pump’s suitability regardless of the application.
Technical Features
Pressure | up to 350 barg for hydraulic diaphragm and 650 for packed plunger |
---|---|
Flow Rate | up to 7,800 l/h with a single head |
Fluid temperature | from -10°C to 90°C (from -40°C to 150°C on request) |
Wetter Parts | SS 316L, PP, PVDF and PTFE (exotic alloys available on request) |
Mechanism
Full-motion type in six different sizes, featuring:
- Oil-bath lubrication
- Low-noise internal worm gearbox
- High-precision stroke adjustment for ultrafine volume control
- Increased turndown ratio achievable via frequency converter
- Housing available in cast iron as standard and nodular cast iron to cope with harsh ambient conditions
- Exakta-designed electrical and pneumatic actuators available
Nexa Mechanism
Technical information
Mechanism available in six different sizes to ensure maximum reliability and best performances.

N0, N1 Mechanisms
Size | Stroke Length [mm] | Plunger Diameter Range [mm] | Thrust [kN] | Hydraulic Power [kW] |
N0 | 10 | 4 - 50 | 2 | 0.1 |
N1 | 25 | 6 - 90 | 5 | 0.4 |

N2 Mechanism
Size | Stroke Length [mm] | Plunger Diameter Range [mm] | Thrust [kN] | Hydraulic Power [kW] |
N2 | 35 | 10 - 120 | 8 | 1 |

N3, N4, N5 Mechanisms
Size | Stroke Length [mm] | Plunger Diameter Range [mm] | Thrust [kN] | Hydraulic Power [kW] |
N3 | 50 | 15 - 130 | 18 | 3 |
N4 | 70 | 30 - 130 | 30 | 5 |
N5 | 70 | 35 - 140 | 45 | 6.5 |
Valves
Exakta is committed to developing flexible and customized valve configurations with flow channels specifically designed to improve hydraulic efficiency while coping with different conditions and applications.


Seam Cone Valve
Thanks to additive manufacturing technology, delivers high performance with SS 3D printing while allowing endless shape possibilities to meet unique in-valve fluid dynamics for every application.
Features
- Lower NPSH required (up to 10%)
- Increased volumetric efficiency (3%)
- 30% lighter than conventional machined valves
- Enhanced durability for longer mean time between repair
Advantages at a glance

The superior versatility of Nexa pump drive unit allows motors to be mounted left-sided, right-sided or even vertically depending on the installation requirements. Nexa also allows different-sized mechanisms to be coupled, with casings designed to maintain the same foot level in order to allow installation on a flat support base. An internal gearbox allows pumps with different stroke adjustment to be combined to form multihead units for greater flexibility.


Mechanisms are coupled together using joints with no exposed parts, resulting in a compact unit with a strong and perfectly-aligned connection which removes the need for a special base. As process demands for changes in process conditions, users can quickly and easily add a pump to an existing system by performing a few simple coupling operations, even on site.
Industry Applications




Sour water for stripper column

Multi-compound fertilizers production


Icing and syrups
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