HZT-5775500 EVAC Vacuum Toilet Pneumatic Control Unit for EvacInclick Flush Systems, Integrated with HZT-5774002 Water Valve, HZT-5959902 Mini Check Valve and Pneumatic Hose Assembly

Poduct Overview

HZT-5775500 pneumatic control unit is a core air-operated control component used in EVAC vacuum toilet systems, designed to manage and transmit pneumatic signals during the flushing cycle.
This component corresponds to EVAC part number 5775500 and is widely applied in marine vacuum toilets equipped with EvacInclick flush control systems, where stable pneumatic logic is essential for reliable, electricity-free operation.

In a typical EVAC vacuum toilet installation, the flushing process is initiated by a pneumatic push button. The air impulse generated by the user is routed through hose assemblies to the HZT-5775500 control unit, which regulates the pneumatic sequence required to actuate downstream components such as the water valve and auxiliary check valves.

Pneumatic Flush Control Logic in EVAC Systems

EVAC vacuum toilet systems utilize a fully pneumatic control philosophy to ensure operational reliability in marine and offshore environments.
Within EvacInclick flush control units, including:

• EvacInclick 1 (P/N 5350000)
• EvacInclick 2 (P/N 5350020)
• EvacInclick 3 (P/N 6542341)

the HZT-5775500 pneumatic control unit functions as the central control element that coordinates airflow timing and pressure distribution during the flush cycle.

Unlike electrically actuated systems, this pneumatic arrangement eliminates electrical dependencies, reducing failure risks caused by moisture, corrosion, or unstable power supply commonly encountered onboard vessels.

Integration with Water Valve and Auxiliary Components

During operation, the HZT-5775500 works in close coordination with EVAC-compatible water valves such as HZT-5774002, as well as the mini check valve (HZT-5959902) and associated pneumatic hose assemblies.

This integrated configuration enables:

• Controlled admission of flushing water
• Prevention of backflow within the pneumatic circuit
• Stable flushing performance under variable vacuum conditions

The correct interaction between the pneumatic control unit, water valve, mini check valve, and hose network ensures that each flush cycle is completed efficiently while maintaining system vacuum integrity.

Maintenance and Replacement Considerations

Over extended service periods, pneumatic control components may experience wear due to repetitive actuation, pressure fluctuations, or aging of internal seals.
Symptoms such as delayed flushing response, inconsistent water flow, or incomplete flushing cycles may indicate degradation of the pneumatic control mechanism.

Replacing the original component with HZT-5775500, corresponding directly to EVAC 5775500, restores the original pneumatic control logic without requiring modification to existing hose routing, mounting brackets, or valve interfaces. This makes HZT-5775500 a preferred spare part for ship maintenance teams, retrofit projects, and marine service engineers.

Typical Applications

• Marine vacuum toilets on commercial vessels
• Cruise ships and passenger ferries
• Offshore platforms and support vessels
• Shipyard retrofitting and system overhauls
• EVAC vacuum toilet system maintenance and spare part replacement

Product Positioning Summary

HZT-5775500 pneumatic control unit is a critical control component within EVAC vacuum toilet systems, particularly those utilizing EvacInclick 1, EvacInclick 2, and EvacInclick 3 flush control assemblies.
For operators and service providers sourcing EVAC pneumatic spare parts, vacuum toilet flush control components, or marine-grade pneumatic control units, HZT-5775500 offers a technically aligned and reliable solution consistent with original system design principles.