Nocchi Pressomat

Summary

Product identification

The Nocchi PRESSOMAT series consists of industrial pressure boosters with pressure switch control. These are automatic pressure booster sets designed for distribution mains, available with single-phase and three-phase power supply.

The booster sets feature:

• HIGH HYDRAULIC EFFICIENCY
• ROBUST construction
• PIPELINES IN AISI 304 STAINLESS STEEL

Models include:

• VLR 2B
• VLR 4
• VLR 8
• VLR 16
• VLR 32

Operating limits

• Maximum operating pressure: 16 bar
• Ambient temperature: +50° C

Mechanical / hydraulic

The system utilizes two VLR centrifugal, multi-cell, vertical axis electric pumps.

General Specifications:

• Number of pumps: 2
• Maximum flow rate: 1400 L/min (84 m³/h)

Construction Materials:

• Base:
  • In galvanized sheet steel on versions with VLR2B - VLR4 - VLR8 - VLR16/50
  • Profiles with galvanized steel on versions with VLR32
• Suction Manifold (in AISI 304 stainless steel) includes:
  • 2 brass ball valves
  • 2 check valves
  • 1 water filling hose
• Delivery Manifold (in AISI 304 stainless steel) includes:
  • 2 brass ball valves
  • 1 pressure gauge
  • 2 differential pressure switches

Control System: The pumps are controlled by two differential pressure switches with adjustable settings, connected to an analogue electronic board via an electrical panel. Key control features include:

• Sequential start-up of the pumps
• Inversion of start-up sequence
• Timer settable from 0 to 180” (on three-phase version only)
• Protection against dry-running
• Automatic inverter changes pump start-up sequence at the end of each cycle.
• Electronic board delays start-up of the second pump in case of simultaneous closure of both pressure switches, preventing sudden pressure variations and power supply overload.

Hydraulic Performance: Performance tables for specific models (PM.20-VLR 2B, PM.20-VLR 4, PM.20-VLR 8, PM.20-VLR 16, PM.20-VLR 32) detail flow rates (L/min, m³/h) and maximum head (m.c.a. / m.w.c.) for various kW configurations. See the official PDF for exact tabulated values.

Overall Dimensions and Weights: Tables for specific models (PM.20-VLR 2B, PM.20-VLR 4, PM.20-VLR 8, PM.20-VLR 16, PM.20-VLR 32) provide dimensions in mm and net weights in kg for 230 V and 400 V versions. See the official PDF for exact tabulated values.

Electrical

Power Supply:

• 1230V / 3400V (for VLR 2B, VLR 4, VLR 8, VLR 16, VLR 32)
• 3~400V (for specific VLR 4, VLR 8, VLR 16, VLR 32 models)

Protection Ratings:

• Electric pump protection rating: IP55
• Single Phase Electrical Panel protection rating: IP55
• Three Phase Electrical Panel protection rating: IP54

Single Phase Electrical Panel:

• Enclosure: IP55 plastic
• Components: Main thermal magnetic switch, electronic control panel with manual-automatic selection buttons for each pump, SML Electronic board, pump start relay.
• Main Functions: Sequential inversion of pump start-up at the end of each work cycle, ON/OFF control of tank level (first collection) or pressure in supply pipeline via a float switch or other differential pressure switch.
• Signals and Controls: Power ON indicator led, indicator led to signal low water level in tank on first collection or low pressure on supply line (aqueduct), pump running indicator led for each pump.
• External Control Devices: Two differential ON/OFF pressure switches, ON/OFF float switch (installed in the water collection tank) or inverse pressure switch (inserted in water supply line).

Three Phase Electrical Panel:

• Enclosure: IP54 metal
• Components: Main switch, keypad with SA electronic board, fuses, contactors and thermal relay for each pump, transformer with fuses for auxiliary circuit, M-0-T selector for each pump, Delta-Star starter for motors over 7.5 kW.
• Main Functions: Sequential inversion of pump start-up at the end of each work cycle, ON/OFF control of tank level (first collection) or pressure in supply pipeline via a float switch or other differential pressure switch, pump timer settable between 0 and 180 sec. after opening of pressure switch operation contact.
• Signals and Controls: Power ON indicator led, indicator led to signal low water level in tank on first collection or low pressure on supply line (aqueduct), pump running indicator led for each pump, indicator led to signal trip of one of the two overload thermal cut-outs, Automatic/Manual mode indicator led, buttons for selection of automatic or manual control, buttons for start and stop of each pump (manual mode).
• External Control Devices: Two differential ON/OFF pressure switches, ON/OFF float switch (installed in the water collection tank) or 3 electrodes for electronic level control (in first collection tank) or inverse pressure switch (inserted in water supply line).

Accessories

Available accessories include:

• Float switch for protection against dry running
• Differential pressure switch for inhibition in event of mains pressure failure
• Electrodes for electronic level control
• Membrane autoclaves
• Kit of couplings for expansion tanks

Disclaimer: This summary is based on extracted text and may not include all figures, footnotes, or the latest revisions from the original OEM PDF datasheet. Contractual data must always match the specific OEM PDF revision used for the project.

Official datasheet (PDF)

Lenntech datasheet mirror