Omar Khalid
Plastic water valves are used in low-pressure, low-temperature applications such as ice makers, hydroponics, and aquariums. They are also commonly used in plumbing fixtures such as toilets, sinks, and water heaters. While plastic valves are inexpensive and resistant to corrosion, they tend to be less durable than metal valves and can become brittle over time. Turning off a plastic water valve involves rotating the handle or knob to restrict water flow. However, if the valve is stuck, it is important to exercise patience and avoid using brute force to prevent damage. Techniques such as using pliers to turn the packing nut or applying penetrating oil to the stem can help loosen a stuck valve.
| Characteristics | Values |
|---|---|
| Types | Multi-turn, quarter-turn, push/pull style |
| Construction material | Plastic, polypropylene, metal |
| Location | Underneath or behind fixtures and appliances, along the perimeter of the home on the side that faces the street, in basements, behind an access panel, outside along the curb and sidewalk |
| Issues | Prone to corrosion, leaks, and breakage over time |
| Techniques for turning off | Using a water shut-off key, turning the handle, using pliers to turn the packing nut |
| Considerations | Size of inlet and outlet diameter, cost, reliability, ease of use |
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What You'll Learn
Locating the main water shut-off valve
The main water shut-off valve is usually located inside the home. The most common locations include the basement, crawl space, mechanical room, an exterior wall, or the yard. If your home has a basement or crawl space, the valve is likely located there, close to where the water line enters the house. Specifically, it should be very close to your water meter, which allows you to detect the amount of water your home uses and identify any plumbing leaks. If your home does not have a basement or crawl space, the valve may be located in the mechanical room, closet near the water heater, or laundry room. It could also be under the kitchen sink or in a similar location.
If you cannot find the valve inside your home, it may be located outside, near the front curb. You will be looking for a cement box, also known as a Buffalo box, buried underground. The lid of the box will likely be made of heavy iron and labelled with "WATER" or "WATER METER". You may need to dig around the grass to locate the lid, and you can usually open it with a large screwdriver or a special "meter key" from a hardware store.
If you are still unable to locate the main water shut-off valve, refer to your property inspection report, which should indicate the location of the valve in the plumbing section. If you do not have access to this report, contact your local water department for assistance. They can shut the water off at the curb stop, allowing you or a plumber to install a main water shutoff valve. Alternatively, a plumbing company offering water line detection services may be able to locate the valve or confirm that it is unreachable.
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Using a water shut-off key
Water shut-off keys are an essential tool for every home. They are also known as water shut-off tools, curb keys, or curb box keys. They are used to turn off the water supply to your home in case of a water supply issue or when you need to shut off the water for repairs.
Water shut-off keys consist of a handle with two prongs at the end or a slot that fits over the meter valve. They are relatively inexpensive, ranging in price from less than $10 to $30 for a high-quality one. They come in shorter hand-held versions and taller iterations, ranging from two to five feet in length. The length depends on how far below grade your meter is.
To use a water shut-off key, first, locate your water meter. Water meters can be located in a variety of places depending on the age and design of your house and how the property lines are drawn. Usually, homes are connected to city water lines in a small enclosure near the street that serves the neighbourhood. The most common types of meter enclosures are small round plates that say "water meter" on them or rectangular boxes made of plastic and concrete with a lid that has a small hole for prying open with a screwdriver. Sometimes, the round ones have a nut that must be loosened to open them. They may be buried or filled with dirt or debris, so some maintenance may be required once you find your meter.
Once you have located your meter, use the water shut-off key to slowly turn the valve until the arrow points towards the curb. The arrow on the top of the valve indicates the direction of the water flow. For newer water shut-off valves, turn the key a quarter turn clockwise to stop the water flow and counterclockwise to start the water flow. For older valves, turn the key slowly and incrementally. Turn the key clockwise to decrease the water flow rate until the flow stops completely, and counterclockwise to increase the water flow rate.
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Fixing a stuck valve
If you have a stuck plastic water valve, it is important to practice patience and avoid using brute force, as this can damage the valve. Before attempting to fix the valve, turn off the water at the main shut-off valve to prevent any potential water damage.
One method to try is to place a cloth over the handle and use your hand to slowly rock the valve back and forth to loosen it. If this doesn't work, try using pliers to turn the packing nut, located closest to the valve's handle, a quarter turn counterclockwise. Then, work the valve back and forth until it loosens. Remember to tighten the packing nut again afterward. When turning the packing nut, some water may escape, so have a bucket handy to catch any leaks.
If the valve is still stuck, consider turning off the water supply to the plumbing fixture, loosening the packing nut with pliers, and sliding it up the stem of the valve. Then, spray some penetrating oil onto the stem so that it can reach the rubber washer or packing material. This should help to free any corrosion inside the valve.
If, after trying these methods, the valve is still stuck, it is recommended to contact a professional plumber to avoid causing any further damage or leaks.
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Replacing plastic valves
Plastic valves are used in many exterior plumbing systems, such as swimming pools, hot tubs, and sprinklers. Over time, the valves can wear out, making it necessary to replace them.
Before replacing a plastic valve, it is important to turn off the main water supply to the house. 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.
The next step is to remove the old valve. Cut the plastic pipes 1/2 inch from each end of the valve that is being replaced, using a handsaw. If the valve is a compression-type valve, loosen the compression nut with an adjustable wrench. Push the nut away from the ferrule, and then cut the ferrule with a hacksaw. Be careful not to damage the pipe. Once the ferrule is cut, use a flat-head screwdriver to pry it loose from the pipe.
If the valve is a thread-type valve, hold the pipe steady with a pipe wrench and twist the valve off using an adjustable wrench. If the valve is soldered, use a propane torch to heat the fitting and remove as much solder as possible. Clean the pipe with a sanding cloth to ensure it is smooth.
After removing the old valve, it is important to clean the pipe and prepare it for the new valve. If the new valve is a compression-style valve, slide the compression nut over the supply pipe, followed by the ferrule (or compression ring). If it is a thread-type valve, clean the threads with a wire brush and wrap them with thread seal tape or pipe thread compound. If it is a solder-type valve, place the valve onto the pipe and twist it to distribute the flux evenly.
Finally, install the new valve. If it is a compression-style valve, slide the valve body onto the pipe end and thread the compression nut onto the male threads of the valve body. Tighten the compression nut with adjustable wrenches until the sleeve compresses onto the tubing. If it is a thread-type valve, hold the pipe steady and twist the valve onto the threads. If it is a solder-type valve, heat the fitting with a propane torch and apply solder at the joint once the flux begins to bubble.
Turn on the main water supply and open the newly installed valve. Allow the water to flow and check for leaks. Tighten as necessary.
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Quarter-turn valves
To turn off a quarter-turn valve, simply rotate the handle a quarter turn (90 degrees) clockwise. This will cause the ball to seal the aperture, blocking the water flow. When the handle is retracted by turning it a quarter turn counterclockwise, water can flow through the valve as the ball rotates.
The ease of use and quick shut-off capability of quarter-turn valves make them a preferred choice in water treatment, oil, and gas industries. They are also durable and resistant to blockages, making them ideal for hard water areas.
It is important to note that quarter-turn valves cannot be repaired once they start leaking and will need to be replaced. Additionally, their rapid closure can sometimes cause hydraulic shock in pipes, so it is recommended to turn the valve slowly when turning on the water to avoid potential damage to the pipes.
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Frequently asked questions
It depends on the type of valve. Multi-turn shut-off valves can be turned off by tightening the handle, which forces a rubber gasket onto a seat in the middle of the valve and restricts water flow. Quarter-turn valves are operated by twisting a handle on the valve stem, which pivots a steel ball with a drilled hole.
Try not to force it as this can damage the valve. Try loosening the packing nut a quarter-turn counterclockwise with pliers, then work the valve back and forth. If this doesn't work, turn off the water supply to the fixture, loosen the packing nut, and slide it up the stem. Spray penetrating oil on the stem to free any corrosion.
Plastic valves are suitable for low-pressure, low-temperature applications such as ice makers, aquariums, and reverse osmosis systems.
Plastic valves won't corrode like metal ones, but they can get brittle over time and may be more prone to leaking. Metal valves are generally considered superior but are more expensive.
To remove a plastic valve, shut off the house water supply and disconnect the hose from the faucet. Then, unscrew the valve counterclockwise from the copper pipe.
