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How to connect a back flow prevention valve

July 12, 2010 at 2:40 pm | Category: Remodeling Contractor



Step 1
Know that check valves come in a variety of sizes. In general, they are used in the vehicle braking system to prevent brake fluid from returning to the reservoir when under pressure. Either type check valves are used and installation is the same for both types. Place a drip pan under tubing and check valve to be changed.

Step 2
Using line wrench or pipe wrench, turn the fittings counter clock wise to loosen. If any pressure remains in the line, allow it to be released while fittingd are loose. Continue turning the fittings counter-clockwise until they are completely disengaged.

Step 3
Remove check valve from tubing and allow residual fluid to go in drip pan.

Step 4
If fittings need replaced, now is the time to remove them by using the tubing cutter. After cutting the tubing below the fitting, remove old fitting and replace with a new ferrule and fitting. Use same procedure for the opposite fitting.

Step 5
Place new check valve up to new fitting on one end. Use line wrench and turn clockwise until fitting is snug. Be sure the check valve is pointing in the right direction. The check valve will have an arrow embossed into the valve. Make sure arrow points in the direction of flow from the line. Use a line wrench and attach a second fitting to the opposite end of check valve. Use service manual procedures for removing air from the line and dispose of fluid in drip pan in an OSHA approved container.


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