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| Illustration 1 | g02156007 |
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(1) Valve
(2) Outlet (3) Lever (4) Diaphram (5) Spring (6) Tube (7) Tube (8) Diaphram (9) Spring (10) Bolt (11) Inlet | |
If the pressure at outlet (2) is less than the setting of spring (9), the spring pushes up on diaphram (8).
Note: Bolt (10) is used to adjust the setting (tension) of spring (9).
When diaphram (8) rises, the pilot orifice for the gas from tube (7) opens. The gas flows through tube (6) and the gas applies pressure on the top side of diaphram (4). The pressure moves diaphram (4) downward, moving lever (3). The movement of the lever opens valve (1) in order to provide more gas through outlet (2).
When a sufficient amount of gas is supplied downstream, the outlet pressure rises. The pressure is applied to the top of diaphram (8), which exceeds the setting of spring (9). The downward movement of diaphram (8) closes the pilot orifice that supplies pressure through tube (6).
The pressure on the top of diaphram (4) is released into the main chamber of the regulator through a passage. As the pressure on top of diaphram (4) decreases, the diaphram is pulled upward by spring (5), causing upward movement of lever (3). Upward movement of the lever closes valve (1) in order to reduce the gas through outlet (2).