You could even have a control valve and an on-off valve on the same system, with the on-off valve acting as a backup in case the control valve fails. Because they’re all or nothing, they’re often used as emergency shutoff measures. These are excellent for jobs where precision is crucial and there are a number of factors that have to be tightly controlled.īall valves are good for more black-and-white situations. Uses for EachĬontrol valves are used in situations where you need specific control over a piece of a system. Gate valves and plug valves use conical pieces that slide down through the channel, sealing it securely shut. Butterfly valves have a flat piece of metal that rotates to open or close the channel. There are a couple of different styles of on-off valves, including ball, plug, butterfly, gate, and globe valves.Ī ball valve consists of a ball with a channel cut through it that can be turned so the channel aligns with the rest of the line, allowing flow, or so that it doesn’t, shutting off flow. It either allows for unimpeded flow or it shuts off flow completely. On-Off ValvesĪn on-off valve is a much less precise instrument than the control valve. The positioners monitor and control the actuator movements to maintain the desired set-point. The actuators on these valves can be pneumatic, hydraulic, or electrically powered, and they control how the valve opens and closes. A control valve includes a valve body, actuator, and positioner, as well as body assembly and trim parts. They can maintain different variables at specific set-points, including density, concentration, flow rate, pressure, temperature, and liquid levels. Control ValvesĪs you might guess from the name, a control valve is used to control the flow of fluid in a system. Read on to learn more about these two different valves and how they’re used. Control valves are more precise, whereas on-off valves are more all-or-nothing. ![]() Many people have trouble with the difference between control valves and on-off valves.Ĭontrol valves and on-off valves serve different purposes depending on the degree of control you need for your system. ![]() Each serves a specific purpose, but keeping them straight can get confusing. When you’re setting up a fluid control system, there are dozens of different types of valves you have to choose from. You likely will have quite a number of these valves in your home.Home / What’s the Difference Between a Control Valve and an On-Off Valve? Here’s Everything You Need to Know What’s the Difference Between a Control Valve and an On-Off Valve? Here’s Everything You Need to Know The first is an angled fixture shutoff, shown here, used when a water pipe comes out of the wall and needs to angle straight upward to feed supply tubes running to tailpieces on a sink faucet or toilet valve. With these, a short 1/4 turn of the handle turns the valve from fully open to fully shut.įixture shutoff valves are available in styles that can be soldered onto copper pipes or solvent-glued onto plastic pipes, but more common are compression fittings that slip over the pipe and are tightened down in place. There are also "grip-fit" types (such as SharkBite) that simply slide onto the end of a water pipe and seal by means of an inner gasket.įixture shutoff valves come in many variations. These fixture shutoff valves can take many appearances, but a very common one is a small silver-colored valve with an oval handle with ribbed edges for gripping. Internally, these valves may use a compression stem (you will feel a "squeeze" when closing the valve), but more common is a style that uses a small ball inside. This allows water to be shut off for small repairs or replacements to the fixture itself without interrupting water flow to other areas. Individual fixtures all should have some form of individual shutoff valve that controls water to only those fixtures. Here are seven common types of water shutoff valves to help you identify yours. Valves generally operate in one of two ways: Either a solid internal part rotates to open or block the flow of water, or some kind of stem with a washer or seal "squeezes" down to seal the flow of water. Some of these valves are quite large while others are rather small. ![]() Water valves can range from the main valve found near the water meter where water first enters your home to small, individual fixture shutoff valves that mark the transition from the branch water supply lines to the supply tubes that deliver water to faucets, toilets, or other appliances. Locating and turning off the appropriate water shutoff valve is, therefore, very important. Shutting off the water is often the first step of many plumbing projects. Your home's plumbing system has a variety of valves found at various points along the water pipes that allow you to turn off the water during emergencies or when you need to make repairs or upgrades. The Spruce Home Improvement Review Board.
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