Gas Taps – Chemistry – Flashcards
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| Gas Tap |
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| Found on Gas Fires and Cookers |
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| Gas Tap Construction |
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| Consists of A TAPER PLUG held in place by a COMPRESSION SPRING Large orifice through which gas flows when valve is turned to high. Smaller orifice when valve is turned to low |
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| Gas Tap Parts |
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| iNJECTOR VALVE BODY TAPER PLUG (with both large n small orifices) RETURN SPRING NITING PLATE TAP SPINDLE |
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| Ball Valve Construction |
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| Consists of a Chromium plated Brass sphere. Circular hole cut through the axis/ |
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| Ball Valve Operation |
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| The sphere /ball is located in a nylon seat which gives a gas seal,when the valve is turned OFF |
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| Ball Valve |
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| The valve is operated by turning a spindle,which either has a screwdriver slot or handle attached |
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| Ball Valve Purpose |
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| Commonly used to isolate appliances Also used as ECVs Maintenance free,cannot be repaired,must be replaced if defective |
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| Solenoid Valves |
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| Are ELECTRICALLY OPERATED gas valves |
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| Solenoid Valves PURPOSE |
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| To turn ON or OFF a gas supply by electrical means. |
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| Solenoid Valves Construction |
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| Normally when no power is present,the gas valve is closed,and when power is applied the valve opens. |
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| Solenoid Valves Coil |
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| "Copper wire on a bobbin",arranged around a SOFT IRON CORE |
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| Solenoid Valves Soft Iron Armature |
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| Free to move up or down within the coil |
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| Solenoid Valves Valve |
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| Attached to SOFT IRON ARMATURE,pushed onto its seat by the RETURN SPRING when no power is present so preventing gas flow. |
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| Solenoid Valves Return Spring |
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| Pushes the gas valve onto its seat when no power is present. |
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| Solenoid Valves Operating |
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| Power is switched on,current flows through coil,generating an electromagnetic field,which overcomes force of RETURN SPRING,lifts the SOFT IRON ARMATURE up and the gas valve away from its seat,allowing gas to flow through the solenoid valve. |
