Product Description Air Release & Vacuum Relief Valves are installed on the highest point of a drip irrigation or drip tape watering system to minimize the collapse of mainline and submain pipes, and reduce back siphonage of dirt into drip emitters and drip tape. A rapid drop in line pressure can cause tubes to collapse or flatten. In a newly installed system, loose soil may settle around a collapsed tube, making it difficult for the tube to regain its shape when the next irrigation cycle begins. Air release valves also reduce the chance of water hammer caused by a sudden reversal of water flows. They allow air to escape during system start-up and prevent air restrictions. Trapped air bubbles can damage pumps (via cavitation) and disrupt flow rates and pressure. Product Details - Dual acting air release & vacuum relief valve
- Maximum working pressure: 80 psi
- Inlet 1" pipe thread
- Seals at 5 psi
- Clear open diameter is 0.610"
- UV stabilized, durable, weather resistant and engineered plastics
- Bright colors for easy visibility
- Removable top for easy seal maintenance
- Height: 5.50 inches
- Width: 1.81 inches
- Weight: .24 lbs
| Metric Conversion Table for 1" & 3/4" Air Release - Vacuum Relief Valves | | Air Action | Pressure | | CFM | CMM | PSI 1" | KPa 1" | PSI 3/4" | KPa 3/4" | | -45 | -1.274 | -6.56 | -45.230 | - | - | | -40 | -1.133 | -4.81 | -33.164 | - | - | | -35 | -0.991 | -3.39 | -23.373 | - | - | | -30 | -0.850 | -2.26 | -15.582 | -4.8 | -33.095 | | -25 | -0.708 | -1.40 | -9.653 | -2.95 | -20.340 | | -20 | -0.566 | -0.78 | -5.378 | -1.75 | -12.066 | | -15 | -0.425 | -0.37 | -2.551 | -0.80 | -5.516 | | -10 | -0.283 | -0.13 | -0.896 | -0.30 | -2.068 | | -5 | -0.142 | -0.02 | -0.138 | .0.10 | -0.689 | | 0 | 0 | 0 | 0 | 0 | 0 | | 5 | 0.142 | 0.04 | 0.276 | 0.20 | 1.379 | | 10 | 0.283 | 0.18 | 1.241 | 0.25 | 1.724 | | 15 | 0.425 | 0.38 | 2.62 | 0.50 | 3.447 | | 20 | 0.566 | 0.65 | 4.482 | 0.95 | 6.550 | | 25 | 0.708 | 0.88 | 6.067 | - | | B5-VBK1 |
