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. [Usual Installation Instructions] *- Remove cap and core. *- Insert tubing or body into the corresponding size line or hole and braze into place. *- Replace core, tighten, evacuate and charge the system. *-Replace cap. [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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