TPP140 | Thermal Relief Valve 1/2 in, Plastic

Overview

The Annovi Reverberi TPP140 Thermal Relief Valve is a lightweight, cost-effective
safety component designed to protect high-pressure pumps from overheating during bypass operation.
In many cleaning systems, especially compact or portable pressure washers, water recirculates when
the trigger is released. Without active cooling, this water rapidly heats up, threatening seals,
valves, and other internal pump parts. The TPP140 automatically discharges hot water and replaces
it with cooler supply water, keeping pumps within safe temperature ranges and extending service
life.

Unlike traditional brass or stainless steel relief valves, the TPP140 utilizes a durable polymer
body that resists both chemical corrosion and thermal stress while reducing overall system weight.
This makes it particularly attractive for portable washers, mobile rigs, and lightweight contractor
equipment where every ounce matters. Despite its compact footprint, it delivers dependable,
maintenance-free protection for pumps in both professional and homeowner systems.

Engineering & Construction

• Pressure/thermal design: Opens automatically when water temperatures in bypass
  approach unsafe levels, preventing seal and pump body damage.
• Body material: Lightweight, chemical-resistant polymer for corrosion protection
  and portability.
• Connection size: 1/2" standard fitting, compatible with most small-to-mid
  scale washers.
• Durability: Resistant to cleaning detergents, sanitizing agents, and standard
  chemical solutions commonly used in commercial and residential applications.
• Compact profile: Ideal for tight system layouts or portable equipment with
  limited space.

This balance of affordability, simplicity, and durability makes the TPP140 a smart safeguard for
a wide variety of pressure washing equipment.

Functional Benefits

• Pump protection: Prevents premature pump failure caused by overheated water in
  bypass cycles.
• Extended service life: By automatically venting hot water, it reduces strain on
  seals, gaskets, and pump heads.
• Maintenance-free operation: No adjustment or calibration required—factory-set to
  respond consistently when heat thresholds are reached.
• Lightweight & portable: Plastic construction reduces system weight compared
  to brass or stainless steel models.
• Chemical resistance: Suitable for systems using mild detergents or chemical
  cleaning agents without risk of rapid corrosion.

Installation & Maintenance

• Integration: Installs directly into a 1/2" system port near the pump
  outlet or bypass line.
• Orientation: Typically mounted upright for reliable venting, though compact
  size allows flexible placement.
• Operation: Automatically cycles open when water temperature exceeds safe
  operating levels.
• Servicing: Designed as a low-cost, maintenance-free component; replace if wear,
  clogging, or cracking occurs.
• Shipping: Commonly stocked and ships via UPS Ground within 24 hours under
  normal conditions, with 2–3 days expected during peak demand.

Applications

The TPP140 Thermal Relief Valve is designed for lightweight and compact cleaning systems where
pump safety is critical but heavy components are impractical:

• Portable pressure washers: Used in contractor units and mobile rigs where
  frequent stops and idle cycles cause water to heat quickly.
• Stationary wash systems: Protects pumps in facilities that run equipment
  intermittently.
• Commercial cleaning equipment: Ideal for smaller shops, janitorial crews, or
  mobile fleet washers that require compact pump protection.
• Residential units: Adds professional-grade pump protection to homeowner systems,
  reducing long-term maintenance costs.

Key Specifications

• Model: TPP140
• Type: Thermal relief valve
• Connection size: 1/2"
• Material: Lightweight, corrosion-resistant polymer
• Function: Automatic discharge of hot water during bypass cycles to protect pump
  internals
• Applications: Portable washers, stationary cleaning units, contractor rigs, and
  residential pressure washing systems

Bottom Line

The TPP140 Thermal Relief Valve delivers simple, reliable pump protection by
preventing overheating during bypass operation. With its corrosion-resistant plastic body,
standard 1/2" connection, and lightweight build, it is the perfect solution for portable and
stationary systems that demand affordable safety without sacrificing performance. For operators
seeking to extend pump life, reduce downtime, and protect their investment, the TPP140 is an
indispensable safeguard.