How to Replace Plastic Plumbing Shutoff Valves
Plastic pipes with shutoff valves are used with many exterior plumbing systems, such as swimming pools, hot tubs and sprinklers. Over time, shutoff valves, also known as check valves, can wear out, making it difficult to service a filter system or sprinkler system. Replacing a shutoff valve at plastic pipes is not difficult for those who have basic do-it-yourself skills. Obtain a new PVC ball valve and PVC fittings based on the size of the pipe, and organize the necessary hand tools. In most cases, the job takes a relatively short time.
1
Turn off the main water valve to the house. Open a spigot and allow water to drain out of the pipes, and turn off the spigot. For valves at pool or hot-tub pipes, open the pressure-release valve on the filter housing, allow any pressure in the system to escape and then close the valve.
2
Cut the plastic pipes 1/2 inch from each end of the valve that's being replaced, using a handsaw. Discard the valve and remove burrs at the cut ends of the pipes with a file.
3
Use a rag to remove any moisture from the ends of the pipes. Apply PVC primer around the end of one pipe, using the provided applicator. Position the female end of a PVC slip connector at the end of the pipe. Apply PVC cement around the end of the pipe. Push the connector firmly onto the pipe and twist it one-quarter rotation to ensure a watertight fit.
4
Apply PVC primer around the male end of the connector. Position one end of the PVC ball-valve at the end of the connector, with the valve facing the desired direction. Apply cement on the male end of the connector, and push the end of the valve firmly onto the connector. Twist the valve one-eighth rotation each way.
5
Use adjustable pliers to unscrew the ring-nut on a PVC union connector, and separate the two-piece connector. Do not remove the ring-nut from that half of the connector.
6
Start with the half of the connector that has a female end. Apply primer and cement around the female end, and push the end into the opposite, open end of the valve. Apply primer and cement on the end of the remaining pipe, and push the male end at the other half of the connector firmly onto the end of the pipe.
7
Align the inner ends of both halves of the union, and screw the ring nut onto the threads. Hold the pipe with one hand, and tighten the nut securely with the adjustable pliers.
8
Turn the handle on the ball valve clockwise to shut it off. Turn on the valve at the water supply to the house. Open the pressure-release valve on a filter as you turn on the new valve. Close the pressure release valve when it begins to spew out water.
References
Tips
- Similar procedures can be used to replace shutoff valves for plastic cold-water pipes in workshops, garages and utility rooms. Detach the flexible supply-line to the plumbing fixture before removing the old valve, and reattach it to the new valve.
Writer Bio
William Machin began work in construction at the age of 15, while still in high school. In 35 years, he's gained expertise in all phases of residential construction, retrofit and remodeling. His hobbies include horses, motorcycles, road racing and sport fishing. He studied architecture at Taft Junior College.