Toto spares, Toto parts, Toto spare parts, Spare code no : TH679A - Check valve unit, A check valve ...

Toto spares, Toto parts, Toto spare parts, Spare code no : TH679A - Check valve unit,

A check valve (also called a non-return valve) prevents water from flowing backward in a piping system. It’s a simple one-way gate built inside fittings such as mixers or thermostatic valves.

Primary functions include:

  • 🛑 Preventing backflow: stops water from flowing back toward the supply line — this protects the clean water supply.
  • 🌡️ Safety in mixed hot/cold valves: in cases of thermostatic mixing valves or shower units, a check valve ensures hot and cold water don’t cross-feed into each other’s supply lines.
  • 💧 Protecting plumbing: helps stop pressure fluctuations, back siphoning, and contamination of potable water.

📍 Typical Uses in TOTO Products

TH679A is used as a check valve in various TOTO faucet/shower valve units, particularly those with a TMJ40C-type or similar valve bodies. It is often found inside the internal water paths of:

  • Wall-mounted and concealed shower/mixer valves
  • Thermostatic mixing valves
  • Faucet assemblies where one-way flow must be maintained to ensure correct pressure balancing and safety operation

Because it keeps the water flowing only in the correct direction, TH679A helps p…

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