valve-cap
Definition
- Noun:
- Covering for a valve: A "valve-cap" is a protective cover that fits over a valve, typically on a tire inner tube or other pneumatic system, to seal it from dirt, moisture, and air loss.
Usage Examples
- (The small cover that screws onto the tire valve.)
- (The protective cap for the air valve.)
- (The cap used to seal the valve.)
Advanced Usage
"Valve-cap as a seal": In technical contexts, a valve-cap may also serve as a secondary seal to maintain pressure.
- The valve-cap on the scuba tank must be checked for cracks before each dive. (The cap ensures the valve remains airtight.)
"Valve-cap material": Valve-caps are often made of metal or plastic, depending on the application.
- Brass valve-caps are more durable than plastic ones for heavy-duty tires. (Metal caps resist wear and corrosion.)
Variants and Related Words
Valve (n): a device that controls the flow of a fluid or gas.
- The valve on the tire allows air to enter and exit. (The mechanism that regulates air.)
Cap (n): a covering or lid for a container or opening.
- The water bottle has a cap to prevent spills. (A lid for a container.)
Valve stem (n): the part of the valve that the cap covers.
- The valve stem is often made of rubber or metal. (The protruding part of the valve.)
Synonyms
- Valve cover: a general term for any covering over a valve.
- Tire cap: a common term for a valve-cap used on vehicle tires.
Related Idioms
"Put a cap on it": to stop or limit something (not directly related to valve-cap, but uses "cap" figuratively).
- We need to put a cap on spending this month. (Limit expenses.)
"Blow a valve": to suffer a sudden failure (idiom from mechanics, not directly related to valve-cap).
- The engine blew a valve and stopped working. (A mechanical failure.)