| Model: | ||
| Standard or Nonstandard: | Standard |
|
| Pressure: | HighPressure |
| PriceRange: | ||
| Structure: | Control |

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The fabric-reinforced diaphragm moves based on the loading pressure to control upstream pressure in the diaphragm type pressure relieving valve. Full inlet pressure to the loading chamber to close the diaphragm against the slotted cage can achieve shutoff.
There are some information about its operating principle and maintance.Firstly, it is about the diaphragm type pressure relieving valve's maintenance. This relief valve is designed for normal wear, so it should be inspected frequently and replaced if it needs.Because of the care Fisher taking in meeting all manufacturing requirements (heat treating, dimensional tolerances, etc.), you should use only replacement parts manufactured or furnished by Fisher.
The frequency of inspection and replacement are based on the severity of service conditions, applicable codes as well as government regulations. Secondly, it is about motion indicator.The motion indicator is used for deciding the position of the diaphragmsupport during inspecting the regulator, however,the motion indicator is not permited to estimate flow. The diaphragm is free to flex a small amount allowing initial flow before it contacts the diaphragm support and moves the indicator assembly and moves with the diaphragm center to provide motion indication and to support the diaphragmwhen open. Except all of these, the diaphragm has some additional travel available after the indicator assembly and diaphragm support have traveled fully.