Hot and cold water tanks have become extremely common in many households today. However, during usage, you may encounter the situation of one-way hot and cold water valve leaks. So how to handle this phenomenon? Let's find out with Mytour in the article below!
What is a one-way hot and cold water valve?
A one-way hot and cold water valve is an indispensable device that ensures the safe operation of hot and cold water tanks and prevents unfortunate incidents from occurring. Unlike two-way valves, one-way valves only have one water flow and no reverse flow, so attention is needed during usage.

Structure
The basic structure of a one-way hot and cold water valve is as follows:
- The one-way discharge valve and the safety valve are designed together in a sturdy valve block
- The safety valve is used to release water vapor in the tank
- The temperature relay part functions to prevent the pressure buildup of hot water and restrict situations of tank explosion or damage.
Principle
The operating principle of most one-way hot and cold water valves is as follows:
- The one-way valve only allows water to flow in one direction and not in reverse
- If no flow passes through, under the influence of gravity or spring force, the one-way valve will be held tightly to ensure water does not leak out.
- When there is flow passing through, under the action of the flow, the valve will be pushed open allowing water to pass through easily. When the flow stops, the valve will close again according to the correct process.
This is a working principle based on an extremely modern and convenient automatic mechanism for users, eliminating the need for time-consuming valve unlocking procedures.
Causes of one-way valve leakage in hot and cold water tanks
There are several reasons why the one-way valve in hot and cold water tanks leaks, such as improperly fitted valves causing water to leak out. Or it could be due to corrosion over time or excessive water pressure, which makes the valve prone to leakage.

Professional handling of one-way hot and cold water tank valve leakage
When the one-way valve leaks water, appropriate measures should be taken depending on the specific location.
If the leak is at the threaded end, replace the gasket. If it leaks at the valve, open the rubber cover layer and tighten it securely. In cases where the valve is old or shows unusual signs, the safest measure is to replace it with a new one.
Considerations when installing one-way hot and cold water tank valves
Some considerations when installing a one-way valve in a hot and cold water tank:
- The valve should be installed and adjusted to be suitable for the initial water pressure of the hot and cold water tank
- If the incoming water pressure is close to the valve's value, simply install a pressure reducing valve and place it away from the tank.

- Fill the water tank before turning on the electricity. Once done, run a test to check if the one-way valve is functioning properly
- When the one-way valve is draining, a few drops of water will flow out from the outlet, this is not due to valve leakage
- It's advisable to call a professional valve installer instead of attempting it yourself if you lack experience.
Thus, the article has provided you with detailed insights into the condition of one-way hot and cold water tank valves leaking. With the above sharing, hopefully, you will quickly resolve this issue for more efficient and durable operation of the hot and cold water tank.
