| What is droop? |
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This is the outlet pressure change (offset) from the SET (static) pressure which occurs as a flow rate increases. |
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| When to use a tied diaphragm regulator? |
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The tied diaphragm design has a mechanical connection between the diaphragm and the valve stem. This is accomplished by welding a stud to the diaphragm and threading the valve stem into the stud tying the diaphragm to the valve stem. The tied diaphragm design controls the valve stem in both directions. The benefit of the tied diaphragm design is that if the regulator begins to creep, the increasing outlet pressure causes the diaphragm to flex upward away from the orifice pulling the valve stem tighter and tighter into the seat. The more outlet pressure drift or creep, the more sealing force is created. The sealing force will try to compress the contamination into the seat. Another name for the tied diaphragm design is a positive seal regulator. |
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| What are Applications for a Tied Diaphragm Regulator? |
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The most common use for a regulator with the tied diaphragm design is regulating a toxic, corrosive or pyrophoric gas from a high cylinder gas pressure (above 500 PSIG) to a lower working pressure. In this application, if the regulator begins to creep, the tied diaphragm feature will protect the diaphragm from rupturing as well as components in the system downstream of the regulator. |
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