Product Overview

The Annovi Reverberi Mini Matic 4B Unloader Valve with Chemical Injector is a pressure-regulating unloader valve designed for compatible Annovi Reverberi XT and RC pressure washer pumps.

When the pressure washer trigger gun is released, the Mini Matic 4B automatically relieves pressure from the pump and diverts the water through its built-in bypass. This helps protect the pump from continuing to operate against a closed outlet.

The valve also incorporates a built-in adjustable chemical injector, allowing cleaning detergent to be introduced into a compatible pressure washer system.

Rated for a maximum pressure of 180 Bar / 2,600 PSI, this version is designed for pressure washer systems operating between 11 and 18 LPM. It features a 1/2″ female inlet and a 3/8″ male outlet.

Key Features

• Designed for compatible Annovi Reverberi XT and RC pumps
• Suitable for flow rates from 11 to 18 LPM
• Pressure-regulating unloader valve
• Automatically relieves pump pressure at shut-off
• Built-in bypass
• Integrated adjustable chemical injector
• Maximum pressure of 180 Bar / 2,600 PSI
• 1/2″ female inlet
• 3/8″ male outlet
• Suitable for pressure washer repairs and replacement installations
• SKU/order code 20891

Pump Compatibility

Chemical Injector Information

The built-in adjustable chemical injector is designed for detergent application through a compatible pressure washer setup. A suitable low-pressure detergent nozzle or lance setting will normally be required for the injector to draw chemical correctly.

Chemical performance can be affected by the nozzle size, hose length, detergent viscosity and operating conditions.

Flush the chemical injector with clean water after using detergent to help prevent chemical residue and blockages.

Important Ordering Information

This version is designed for compatible Annovi Reverberi XT and RC pumps operating between 11 and 18 LPM.

Check the complete pump model, flow rate, connection sizes and existing unloader arrangement before ordering. If you are unsure about compatibility, please contact us with your pump model or a clear photograph of the existing valve.

Bulk purchase discounts are available on request.

Contact Flowjet Cleaning Equipment

For compatibility advice or assistance selecting the correct pressure washer component, please contact:

Flowjet Cleaning Equipment LTD
Unit 4, Gatebeck Farm
Gatebeck, Kendal
LA8 0HW
United Kingdom

Telephone: 015395 66193
Website: www.flowjet.co.uk