AL691 Mini Pressure Switch | 3/8 in Male, Compact AL Series

AL691 Mini Pressure Switch | 3/8 in Male, Compact AL Series

The AR AL691 Mini Pressure Switch – 3/8″ Male is a compact, high-precision control component
engineered by Annovi Reverberi to automatically regulate water pressure in high-performance cleaning and
fluid-handling systems. Featuring a 3/8-inch male threaded connection, this switch integrates
securely into a wide range of professional and residential pressure washer configurations, monitoring pressure
continuously and switching the pump on or off at pre-calibrated thresholds to protect equipment and improve
efficiency.

Construction & Materials

Durable Housing

The AL691’s housing combines heavy-duty brass with reinforced polymer components that resist
corrosion, vibration, and temperature fluctuations. This rugged construction ensures long-term reliability in harsh
cleaning environments, from mobile wash rigs to fixed industrial bays.

Internal Sensing Assembly

Inside the body, a finely tuned diaphragm and electrical contact system responds instantly to
pressure changes. This design maintains stable water flow while protecting the system from harmful
over-pressurization or dry running, helping extend pump life and reduce unscheduled maintenance.

Pressure Control & Operation

Automatic Start/Stop Logic

The AL691 is factory-calibrated so that when system pressure drops below a preset cut-in level, the
switch automatically signals the pump to start. As pressure rises and reaches the maximum cut-out
threshold, the switch opens and shuts the pump off. This hands-free regulation keeps output pressure within a safe,
consistent window without the need for manual pump control.

Smooth System Performance

By moderating pressure ramps and preventing extreme spikes or vacuum conditions, the switch contributes to a more
stable spray pattern at the nozzle. Seals, valves, and hoses are shielded from sudden shocks, reducing fatigue and
extending the service life of the entire pressure washer system.

Connection & Integration

3/8″ Male Threaded Interface

A 3/8-inch male threaded port provides a secure, leak-resistant connection to standard fittings on
pressure washer manifolds, valves, or pump heads. Compared to smaller 1/4″ switches, the 3/8″ interface
offers improved flow compatibility, making the AL691 suitable for higher-pressure or higher-volume systems.

Compact Form Factor

The mini switch’s compact, fixed design fits easily inside tight shrouds and compact machines, making it ideal for
both portable electric units and stationary installations where space, neat
plumbing, and service access all matter.

Electrical Design & Protection

Sealed Contacts

Internally, the AL691 features corrosion-resistant electrical contacts rated for thousands of activation cycles. A
sealed enclosure protects these components from moisture, dust, and detergent exposure, maintaining reliable
function in wash bays, mobile rigs, and outdoor environments.

Predictable Switching Action

The diaphragm-driven mechanism delivers a smooth, predictable switch action that helps prevent surges when the pump
starts or stops. The result is improved user comfort, better cleaning consistency, and less mechanical shock to the
system with each cycle.

Installation & Maintenance

Simple Setup

• Thread the AL691 into the designated 3/8″ pressure port on the pump, manifold, or header.
• Ensure mating threads and sealing surfaces are clean and free of debris.
• Tighten to the recommended torque to achieve a secure, leak-free seal.

Once installed, the switch requires minimal attention beyond periodic inspection for scale or debris and simple
checks of the electrical connection. Its brass housing also helps dissipate heat, reducing thermal stress on the
assembly during extended-duty cycles.

Applications & Compatibility

System Types

The AL691 is compatible with a wide range of Annovi Reverberi pumps and can also integrate into
other manufacturers’ systems that accept standard 3/8″ male fittings. Typical applications include:

• Compact electric and gas pressure washers
• Industrial wash bays and factory cleaning stations
• Agricultural sprayers and farm washdown systems
• Mobile cleaning trailers and service vehicles

Protection Across Use Cases

In all of these environments, the switch helps coordinate smooth start/stop cycles that protect seals, valves,
hoses, and pump heads from unnecessary stress, while maintaining consistent pressure delivery for dependable,
high-quality cleaning results.

Quality & Reliability

Every AR AL691 mini pressure switch is subjected to rigorous testing for pressure calibration,
electrical integrity, and leak resistance before leaving the factory. This quality regimen ensures that each unit
delivers the durability, precision, and efficiency expected from Annovi Reverberi products.

By combining high-quality materials, responsive pressure sensing, and a compact, installer-friendly design, the
AL691 provides precise automatic control over pump activity and reliable system protection—making it an indispensable
component for maintaining safe, consistent, and long-lasting performance in high-pressure cleaning and water
management applications.