These valves are generally used to have an easy access to the systems for vacuum, charging, pressure check up and other applications.
Valve stem into which a valve core is threaded.
The valve core is a poppet valve assisted by a spring.
A valve cap to avoid entering dirt and jamming it or contaminating the sealing surfaces and causing a leak.
Also the valve cap is provided with a core remover making it very useful in installation or repair works.
A valve stem is a self-contained valve which opens to admit gas to a chamber (such as air to inflate a tire), and is then automatically closed and kept sealed by the pressure in the chamber, or a spring, or both, to prevent the gas from escaping.
They are most commonly used on automobile and bicycle wheels, but also for many other applications.
Refrigeration and air conditioning systems to allow servicing, including recharging with refrigerant;
By plumbers conducting leak-down pressure tests on pipe installations;
As a bleeding and test port on the fuel rail of some fuel injected engines;
Buoyancy compensator inflators of SCUBA systems.
Widely used in high-pressure hydraulic systems on aircraft
Many domestic fire extinguishers use an internal access valve, but with a lever on top to enable quick release of the pressurized content
Flare Male Thread: 1/4" SAE
Copper Tube OD: 1/4"