Solenoid Valve

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Solenoid Valve Empty Solenoid Valve

Post  Admin on Wed Dec 09, 2009 12:30 am

As it is, the 'solenoid' in an integral part of the aircrafts starting systems; we should also know that electro mechanical solenoids are used through out the aircraft for various reasons, such as the cabin pressurization systems and differential controls. First we should note what a solenoid is:

'A solenoid (1827, fr. solénoïde, gr. solen "pipe, channel" + comb. form of gr. eidos "form, shape"[1]) is a three-dimensional coil. In physics, the term solenoid refers to a loop of wire, often wrapped around a metallic core, which produces a magnetic field when an electric current is passed through it. Solenoids are important because they can create controlled magnetic fields and can be used as electromagnets. The term solenoid refers specifically to a magnet designed to produce a uniform magnetic field in a volume of space (where some experiment might be carried out).
In engineering, the term solenoid may also refer to a variety of transducer devices that convert energy into linear motion. The term is also often used to refer to a solenoid valve, which is an integrated device containing an electromechanical solenoid which actuates either a pneumatic or hydraulic valve, or a solenoid switch, which is a specific type of relay that internally uses an electromechanical solenoid to operate an electrical switch; for example, an automobile starter solenoid, or a linear solenoid, which is an electromechanical solenoid'.

The cabin air pressure safety valve is a combination pressure relief, vacuum relief, and dump valve. The pressure relief valve prevents cabin pressure from exceeding a predetermined differential pressure above ambient pressure. The vacuum relief prevents ambient pressure from exceeding cabin pressure by allowing external air to enter the cabin when ambient pressure exceeds cabin pressure. The cockpit control switch actuates the dump valve. When this switch is positioned to ram, a 'solenoid' valve opens, causing the valve to dump cabin air to atmosphere.

FAA -H- 8083 - 25

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