air conditioner parts

Valve stem is a self-contained valve which opens to admit gas to a chamber

Valve core is a poppet valve assisted by a spring that is threaded into the steam)

Valve caps are made of metal, they are provided with core remover and have an inside rubber o-ring

These valves are generally used to have an easy access to the systems for vacuum, charging, pressure check up and other applications.

These Service/Access valves are also known as Schrader valve, or American Valve, and they consist of a valve stem into which a valve core is threaded. The valve core is a poppet valve assisted by a spring. A valve cap is important on a Schrader valve 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.

Uses of Access valves

• on many 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; 
• and in the buoyancy compensator inflators of SCUBA systems. 
• this valves are also 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