Term
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Definition
| Found on Gas Fires and Cookers |
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Term
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Definition
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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Term
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Definition
iNJECTOR
VALVE BODY
TAPER PLUG (with both large n small orifices)
RETURN SPRING
NITING PLATE
TAP SPINDLE |
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Term
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Definition
Consists of a Chromium plated Brass sphere.
Circular hole cut through the axis/ |
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Term
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Definition
| The sphere /ball is located in a nylon seat which gives a gas seal,when the valve is turned OFF |
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Term
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Definition
| The valve is operated by turning a spindle,which either has a screwdriver slot or handle attached |
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Term
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Definition
Commonly used to isolate appliances
Also used as ECVs
Maintenance free,cannot be repaired,must be replaced if defective |
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Term
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Definition
| Are ELECTRICALLY OPERATED gas valves |
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Term
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Definition
| To turn ON or OFF a gas supply by electrical means. |
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Term
Solenoid Valves
Construction |
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Definition
| Normally when no power is present,the gas valve is closed,and when power is applied the valve opens. |
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Term
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Definition
| "Copper wire on a bobbin",arranged around a SOFT IRON CORE |
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Term
Solenoid Valves
Soft Iron Armature |
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Definition
| Free to move up or down within the coil |
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Term
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Definition
| 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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Term
Solenoid Valves
Return Spring |
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Definition
| Pushes the gas valve onto its seat when no power is present. |
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Term
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Definition
| 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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