Sofia Martinez
Shut-off valves, also known as supply stop valves, are essential components of plumbing systems, allowing users to control water flow to specific fixtures or the entire house. While valves are typically made of brass or stainless steel, plastic valves are also available. This article will focus on plastic faucet valves, exploring their functionality, advantages, and potential drawbacks, as well as providing a step-by-step guide on how to shut off these plastic valves effectively.
| Characteristics | Values |
|---|---|
| Types of water shut-off valves | Main water valve, multi-turn shut-off valves, quarter-turn valves, straight stop valves, angle valves, solder-type valves, compression-type valves, thread-type valves, push-to-connect type valves, ball valves |
| Materials | Brass, plastic, polypropylene, chrome-plated brass, copper, steel, stainless steel |
| Location of main shut-off valve | Kitchen, utility closet, downstairs bathroom, outside wall, basement |
| How to shut off water | Turn the valve clockwise, turn on all faucets to drain remaining water, turn all faucets to the off position |
| How to fix a stuck water shut-off valve | Turn off the water at the main shutoff valve, use a wrench to loosen the packing nut, spray penetrating oil on the stem, contact a professional plumber |
| How to install a shut-off valve | Clean the pipe with a sanding cloth, apply flux to the fitting and the joint, slide the compression nut over the supply pipe, place the ferrule over the end of the supply pipe, remove thread seal tape and clean with a wire brush |
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What You'll Learn
Locating the main shutoff valve
Indoor Shutoff Valves
If you live in a colder climate, the shutoff valve is likely located inside your house to prevent freezing-related problems. Here are some common places to look:
- Basement or crawl space: If your home has a basement, the shutoff valve is usually located a few feet from where the main water pipe enters the house. It is typically found on the front foundation wall, either through the concrete floor or wall.
- Mechanical room or utility room: If you can't find it in the basement, check the mechanical or utility room, especially if it's near the water heater or furnace. Plumbing lines are often centralised in these areas.
- Under sinks: In older homes, there may be secondary shut-off valves located directly under sinks or near other plumbing fixtures. However, these valves control water flow to specific fixtures, not the entire house.
- Kitchen or laundry room: In homes without basements or crawl spaces, the valve may be located in a closet near the water heater, under the kitchen sink, or in the laundry room.
Outdoor Shutoff Valves
In warmer climates, the main shutoff valve is typically located outside. Here are some places to check:
- Near the curb, sidewalk, or alley: If your water supply comes from the city, the shutoff valve is likely located outside near the curb, sidewalk, or in an alley. Look for a rectangular or round cover with “water meter” on it.
- Exterior wall: If your home is in a warmer region, the main water line may not be buried below the frost line. Check the exterior walls, perhaps near an outdoor faucet.
- The yard: In some cases, the valve may be installed underground in your yard. Look for an access panel buried in the ground near the street. However, these valves should only be operated by trained individuals with permission from the local water utility company.
- Near a well or pressure tank: If you have a private well, you may have two valves to turn off. Check near the well's pump and the pressure tank.
Additional Tips
- If you have trouble locating the valve, you can refer to the property inspection report or contact a local plumbing service for assistance.
- Once you find the valve, familiarise yourself with its operation. In an emergency, you should know how to shut off the water supply quickly.
- Always turn the valve clockwise (to the right) to shut off the water. If it's a lever-style valve, turn it a quarter turn so it's perpendicular to the pipe. If it's a wheel-style valve, turn it clockwise until it stops.
- When turning the water back on, go slow by turning the valve counterclockwise slowly. Rapidly turning the water back on can damage your plumbing or cause pipes to burst.
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How to turn off the valve
The first step is to locate the valve you want to turn off. There are several types of valves that control the water supply at different levels:
- The wall valve stops water from flowing to individual fixtures.
- The main valve stops water from flowing into your home.
- The street valve cuts off all water flow to your entire property.
For most repairs, you only need to cut off the indoor water supply.
Turning off the wall valve
If you want to stop the flow of water to a specific appliance, such as a sink, check the pipes for the nearest valve. It will likely be made of chrome and located directly below the fixture. Many showers and sinks have two valves for hot and cold water, so make sure to turn them both off.
Turning off the main valve
The main shutoff valve is usually a brass valve with a round handle near the area where water enters your home. It could be located in your kitchen, a utility closet, a downstairs bathroom, or even on an outside wall. Turning the valve clockwise as far as it can go should shut off all of the water fixtures in your home.
Turning off the street valve
If you need to turn off the water at the street level, contact your water company first.
General tips for turning off valves
- If you have trouble turning the valve, wear a work glove to get a better grip or use a wrench.
- If the valve is stuck, do not use brute force as this can damage the valve. Try slowly rocking the valve back and forth with a cloth over your hand to loosen it.
- If the valve is still stuck, consider turning off the water supply to the plumbing fixture, loosening the packing nut using pliers, and sliding it up the stem of the valve. Then spray some penetrating oil on the stem and wait a couple of hours before trying again.
- If you have a ball valve with a metal flange, you will need to use a pipe wrench to make it turn.
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What to do if the valve is stuck
If your plastic faucet valve is stuck, the first thing to do is to shut off the main valve, so you don't accidentally break a pipe and cause flooding.
If you don't have much DIY experience, it might be a good idea to call a professional plumber to avoid damaging the valve and causing a serious leak.
However, if you want to try to loosen the valve yourself, there are a few methods you can try. Firstly, put a cloth over the handle and slowly rock the valve back and forth to try to loosen it. You can also try tapping the valve gently to loosen any rust or sticking surfaces.
If the valve still won't budge, you can try using some penetrating oil. Spray this on the valve stem and wait a couple of hours for it to work its way through the rubber washer or packing material. This should help to free up any corrosion inside the valve.
Another method is to try to increase your leverage by using a tool like the Easy Tap Splitter, which enables you to use the sink faucet as leverage. Alternatively, you can try using a pair of Channellock pliers to slowly move the valve in a clockwise direction and then carefully moving it back counter-clockwise, repeating this process until the valve loosens.
If you have access to two wrenches, you can try turning the valve handle with one wrench while maintaining a counter-rotating force on the valve body with the other. You can also try removing the compression nut with one wrench and turning the handle with the other, then removing the handle, stem, and nut together.
If none of these methods work, you may need to replace the valve.
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Types of valves and their uses
Water shut-off valves are designed to stop the flow of water for repairs and emergencies. The main water valve stops the flow of water from the water meter to the entire house. Other valves shut off the water at individual appliances, fixtures, and faucets.
Valves are made from various materials, including brass, plastic, polypropylene, stainless steel, cast iron, alloy steel, and forged steel. The choice of material depends on the application. For instance, brass valves are commonly used in residential plumbing systems due to their durability and reliability. Plastic or polypropylene valves are suitable for low-pressure, low-temperature applications such as reverse osmosis systems, ice makers, hydroponics, and aquariums.
There are several types of valves, each with its own advantages and disadvantages. Here are some of the most common types:
- Quarter-turn valves are operated by a handle on the valve stem. Turning the handle pivots a steel ball with a hole drilled through its centre. Water flows through the hole when it is open and parallel to the supply line. Turning the handle a quarter-turn in the other direction stops the water flow. Quarter-turn valves tend to be more expensive but more reliable than multi-turn valves.
- Straight stop valves have an inlet and outlet that are aligned. They are typically found where the supply line comes through the floor.
- Angle valves have an outlet that is at a 90-degree angle from the supply line. They are used on supply lines that come from the wall.
- Multi-turn shut-off valves have a handle that, when tightened, forces a rubber gasket onto a seat in the middle of the valve, restricting water flow. Loosening the handle allows water to flow through the valve.
- Ball valves use a ball to control the flow of substances from one opening to the next. They are ideal for gases as they offer better sealing. They are versatile, supporting high pressures and temperatures, and are easy to operate and repair. However, they are hard to clean, increasing the risk of contamination, and are not suitable for continuous throttling.
- Butterfly valves use a circular disc that rotates within its body to regulate flow. They are recognised for their space-saving, lightweight design and ability to handle large flows. However, they are difficult to clean and have limited throttling ability.
- Globe valves feature a spherical body with a movable plug and a stationary seat, allowing for start/stop functions and flow regulation. They are commonly used in systems requiring precise flow control and leak prevention, such as cooling water and chemical feed systems. However, they incur higher costs and induce pressure loss and turbulence.
- Gate valves are prevalent in homes and commercial centres. They are used to isolate specific regions within water supply systems and reroute the flow of water. They can also be used to start or stop the flow of water or any other liquid. Gate valves offer reliable shut-off and are versatile, suitable for various fluids. They have low friction loss, provide laminar flow, and help save energy.
- Check valves are unidirectional valves used to prevent the process flow from returning to the system, thereby protecting equipment and maintaining the process.
- Plug valves are durable and reliable, especially in handling corrosive, abrasive, and toxic materials. They are commonly used in gaseous, vapor, natural gas, oil, and other systems. However, they are unsuitable for throttling applications and require greater actuation force.
- Needle valves are similar to globe valves and feature a long, tapered plunger that fits into a matching seat to control flow precisely.
- Solenoid valves are tailored for specific applications and can be controlled remotely and automatically. They are used in various industries, including water treatment, automotive, and food processing.
- Coaxial valves operate using an internal hollow tube that can shift sideways to control or redirect the media flow. They are typically made from stainless steel for superior corrosion and wear resistance.
- Angle seat valves are pneumatically actuated piston valves that regulate various fluids and gases. Their angled seat design ensures high flow rates and low-pressure loss when open.
- Flat-type diverter valves use gravity discharge to divert the flow of solids in bulk from one inlet point to multiple receiving points.
- Dome valves are power-operated, high-pressure devices that open and close by obtaining a pressure-tight seal. They are used at material inlets to provide proper closure between blow tanks and upper hoppers.
- Double dump valves consist of a flap gate at the inlet and an outlet flap-type gate, with an intermediate lock chamber in between.
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How to replace a plastic valve
Plastic valves are suitable for low-pressure, low-temperature applications such as reverse osmosis systems, ice makers, hydroponics, and aquariums. If you are looking to replace a plastic valve, the first step is to determine the type of valve connection. Valve connections can be categorised into solder-type, compression-type, and thread-type.
If you are removing a solder-type valve, cut the supply line with a pipe cutter, leaving enough room to install the new valve fitting. If there isn't much room to make a cut, heat the fitting with a propane torch until it's loose. Protect any flammable surfaces with a heat shield and pull the valve off the pipe, gently twisting it with a pair of pliers.
For a compression-type valve, loosen the compression nut with an adjustable wrench. If it is a thread-type valve, hold the pipe steady with a pipe wrench and twist the valve off with an adjustable wrench.
After removing the old valve, prepare the stub-out by cutting the pipe to the desired length with the correct tool for your pipe material. Ensure the pipe is rounded and free from any burrs, grooves, or abrasions. Next, determine your valve's connection type and follow the corresponding instructions for installation.
For a PEX crimp connection, slide the PEX F1807 crimp ring over the tubing and follow the manufacturer's instructions for valve inlet installation. For a copper or PEX compression connection, slide the compression nut and compression sleeve onto the pipe end, then slide the valve body onto the pipe end until it bottoms out. Thread the compression nut onto the male threads of the valve body and tighten the compression nut with two adjustable wrenches until the sleeve compresses onto the tubing.
Finally, turn on the main water supply and open the newly installed supply valves. Let the water flow through the faucet to clear the lines. Check for leaks by feeling the fittings by hand or using a paper towel, and tighten as necessary.
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Frequently asked questions
Plastic valves are suitable for low-pressure, low-temperature applications such as ice makers and aquariums. They are also usually less expensive than metal valves. If you are unsure, contact a professional plumber.
Plastic valves are usually quarter-turn valves. To shut off the water supply, twist the handle a quarter-turn in the opposite direction. If the valve is stuck, try rocking it back and forth slowly with a cloth over the handle.
If your plastic valve is stuck, try not to force it as this can damage the valve. First, turn off the water supply to the plumbing fixture. Then, loosen the packing nut with a wrench and slide it up the stem of the valve. Spray some penetrating oil on the stem and wait a few hours before trying to loosen the valve.
Plastic valves are more prone to corrosion and brittleness over time. Metal valves, especially those made of brass, are generally more durable and reliable. While plastic valves are cheaper, they may need to be replaced more frequently. Consider consulting a professional plumber for advice.
