How to fix a thermos lid with a button or valve

How to disassemble the lid of a thermos to clean or replace parts? Some models are fastened with threads and can be easily unfolded; others will require additional tools. In general, the procedure is simple and accessible to any user.

Lid device with valve

The valve in a thermos is an elastic disk with a spike in the center. A spring and a locking washer are put on the tenon. The latter is held in place by a cone-shaped thickening at the end of the spike.

When the owner presses a button on the lid, the valve lowers and allows liquid to flow to the overflow holes. When you press the second button or the same one (depending on the type of locking mechanism), the valve fits tightly to the seals and closes the leak.

How to disassemble

The best option is if the lid has a threaded fastening. All you need:

1. Unscrew the ring with the button / buttons.
2. Push out the valve.
3. Remove the retaining washer and spring.
4. Pull off the oil seal - an elastic ring - from the lower rim of the lid.

All parts must be washed to remove tea or lime deposits, crumbs, tea grounds, etc.

In old thermoses, the valve disc breaks or loses elasticity over time. Theoretically, you can replace it with a new one, but in practice these parts are usually not sold, and you have to replace the entire cover.

Chinese thermos with button:

1. Pull the valve out with force.
2. Place a sufficiently long self-tapping screw into the hole for its tenon and push out the mechanism with buttons.
3. Remove all gaskets, springs and retaining washer to clean.

Advice
Sometimes a new cap leaks fluid because the gaskets and valve disc are not designed. Dip the bottom of the lid in hot water for 5-10 minutes before first use, then carefully screw it onto the thermos until it fits tight.

How to Fix a Fallout Valve

One of the problems that does not immediately make itself felt is abrasion of the retaining washer on the valve stud. Over time, it begins to hold the spring poorly, and the valve flies off, falls into the thermos, and the liquid pours out through the overflow holes.

Replacing the washer is quite simple:

1. Cut out a suitable circle from the plastic lid and make a cross-shaped cutout in it (it is convenient to perform the operation with a plastic knife, which is included in the set of modern burners).
2. Select a plastic dowel of a suitable diameter, cut off the cap with a stationery knife and use it as a retainer.

The magazine purity-en.htgetrid.com draws your attention: the more complex the design of the lid, the higher the likelihood of failure. The most reliable are blind lids with a seal, but they also need to be washed periodically to remove deposits.

Most valve or push-button caps can be disassembled, allowing them to be cleaned and extending their life. The operation is quite simple, and it should be carried out at least once a month if the thermos works a lot.