Pop Indicators
Visual discharge indication — know when a valve has opened
Visual confirmation when a safety relief valve has discharged. The 8XX-PI is an add-on for any 800/801/803/805 series valve. The PDSV1 and PDSV2 series are standalone pressure differential sensing valves for vent line installation.
Add-on or standaloneVisual discharge flagPDSV1 and PDSV2 seriesCompatible with 800 series
| Specification | 8XX-PI Series Pop IndicatorView specs | PDSV1View specs | PDSV1AView specs | PDSV1BView specs | PDSV2View specs | PDSV2AView specs |
|---|---|---|---|---|---|---|
| Type | Add-on option | — | — | — | — | — |
| Compatible With | 800, 801, 803 and other 8-series relief valves | — | — | — | — | — |
| Series | — | PDSV1 | PDSV1 | PDSV1 | PDSV2 | PDSV2 |
Why Cyrus Shank
Every pop indicator is built the same way
ASME Certified Quality
Manufactured and documented to the standards your inspectors and codes require.
Custom Set Pressures
Factory-set to your exact spec at no additional charge on any model in the family.
100% Bench Tested
Every unit is individually tested and verified before it leaves our factory.
American-Made Since 1912
Precision-machined in Williamsport, PA by a family-owned manufacturer.
Where It's Used
Pop Indicators for demanding refrigeration systems
Frequently Asked Questions