Gas Taps – Chemistry – Flashcards

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Gas Tap
answer
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.
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