We recommend that a qualified licensed contractor perform this type of winterization method. The blowout method utilizes an air compressor with a cubic foot per minute (CFM) rating of 80-100 for any 2" or less mainline. The compressor is attached to the mainline via a quick coupler, hose bib, or other connections located beyond the backflow device. For additional winterization procedures, we highly recommend contacting the local dealer for the most common local practices.
IMPORTANT: Compressed air should not be blown through any backflow or flow meter device.
If you need to blow upstream from where the flow meter is located, we recommend bypassing the meter temporarily by using one of two options.
请参阅下方图表，了解安装 SCH 80 或镀锌转接头所需的具体长度。如果当地经销商没有这些尺寸的产品，我们建议您将两个 PVC 阳螺纹接头和相应长度的 PVC 管粘合在一起。
| 型号 | 说明 | 阳螺纹 NPT | 转接头长度 |
|---|---|---|---|
| HC-075-FLOW | ¾" NPT 本体，阳螺纹带 1" NPT 阳螺纹接头 | 1" BSP | 13 cm |
| HC-100-FLOW | 1" NPT 本体，阳螺纹，带 1.5" NPT 阳螺纹接头 | 1 ¼" NPT | 13 cm |
| HC-150-FLOW | 1½" NPT 本体，阳螺纹带 2" NPT 阳螺纹接头 | 2" NPT | 11 3/4" |
| HC-200-FLOW | 2" NPT 本体，阳螺纹带 3" NPT 阳螺纹接头 | 2 1/2" BSPP | 11 3/4" |
A second option would be to install PVC tee-ball valves on each side of the meter. This is the recommended option during NEW installation. The meter will have to be removed manually after the blowout to make sure any residual water is not sitting inside through the winter months.
IMPORTANT: The pipe flowing water into the flow meter needs to be a MINIMUM of 10 times longer than the width of the pipe. The pipe flowing water away from the meter needs to be a MINIMUM of 5 times the width of the pipe.
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