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Service Valve/Access Valve/Charging Valve/Schrader Valve 1/4" ,3/16"
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
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