Term
L.P.D.D.C.R
Main Diaphragm |
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Definition
Above the MAIN DIAPHRAGM is an AIR CHAMBER,which contains a
COMPRESSION SPRING and a small BREATHER HOLE |
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Term
L.P.D.D.C.R
Smaller Compensating Diaphragm |
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Definition
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Term
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Definition
| This is above the MAIN DIAPHRAGM and contains a COMPRESSION SPRING,and a small BREATHER HOLE |
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Term
L.P.D.D.C.R
Compression Spring |
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Definition
Exerts a force on top of the MAIN DIAPHRAGM.
(Adjustable by an ADJUSTMENT SCREW on top of the spring) |
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Term
L.P.D.D.C.R
Adjustment Screw |
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Definition
| This screw can only be accessed by removing a cap,which must be sealed after adjustment |
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Term
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Definition
| Maintains the AIR CHAMBER at atmospheric pressure by allowing air to enter or discharge,depending on the movement of the MAIN DIAPHRAGM |
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Term
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Definition
| Transmits pressure at the outlet onto the underside of the MAIN DIAPHRAGM |
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Term
L.P.D.D.C.R
Impulse Pipe (in operation) |
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Definition
Pressure increases,force exerted on the underside of the MAIN DIAPHRAGM increases
This overcomes the COMPRESSION SPRING and pulls the valve up,stopping the flow of gas. |
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Term
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Definition
| This happens when the VALVE is pulled up onto its seating ,stopping the flow of gas. |
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Term
L.P.D.D.C.R
Turning On An Appliance |
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Definition
Causes pressure in the outlet to decrease until the force of the COMPRESSION SPRING overcomes the outlet pressure.
The COMPRESSION SPRING will push the diaphragm down,pushing the VALVE off its seating,enough to replace gas used by the appliance. |
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Term
L.P.D.D.C.R
Increasing Operating Pressure |
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Definition
| Screw down (CLOCKWISE) the ADJUSTMENT SCREW,which will compress the COMPRESSION SPRING |
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Term
L.P.D.D.C.R
Decreasing Operating Pressure |
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Definition
| Screw up (ANTI CLOCKWISE),this will reduce force on top of diaphragm,reducing both pressure and flow of gas required to move the diaphragm |
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Term
L.P.D.D.C.R
Small Auxillary Diaphragm |
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Definition
Is used to compensate for the effects of unequal pressure on the VALVE.
These are created by higher inlet pressure on the top of the valve,and lower outlet pressure on the underside
This diaphragm is also affected by these pressures,cancelling any downward forces generated by the pressure differences |
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