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Principle of Pressure regulating valve
- Flow characteristics of regulating valve
- The flow characteristics graph of a regulating valve shown in the cata-log is based on the flow sheet shown in the figure.
Flow sheet of regulating valve fl ow characteristics test
1.
In the example graph, the primary pressure (supply pressure) is 686 kPa.
In the succeeding stage of the regulating valve, the secondary pressure is set as a load resistance by a regulating valve when the valve remains closed (0 flow).
This value is the flow 0 in the graph, namely, the value at the left end.
Then the needle valve is opened to let gas flow, and
the change of the pressure (secondary pressure) that is set according to the flow is plotted.
The state in which the set pressure does not change is ideal, but because of the characteristics of a regulating
valve, there is some influence up to a certain flow, and the pressure will change when the flow reaches the limit.
This area where the change is minimum is the area where reducing valves should be used.
In the case of a backpressure valve, the primary pressure is the set pressure. The way to understand the flow characteristics graph is the same as that for the reducing valve.
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In the succeeding stage of the regulating valve, the secondary pressure is set as a load resistance by a regulating valve when the valve remains closed (0 flow).
This value is the flow 0 in the graph, namely, the value at the left end.
Then the needle valve is opened to let gas flow, and
the change of the pressure (secondary pressure) that is set according to the flow is plotted.
The state in which the set pressure does not change is ideal, but because of the characteristics of a regulating
valve, there is some influence up to a certain flow, and the pressure will change when the flow reaches the limit.
This area where the change is minimum is the area where reducing valves should be used.
In the case of a backpressure valve, the primary pressure is the set pressure. The way to understand the flow characteristics graph is the same as that for the reducing valve.
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