Plumbing Valves: Every Type and When to Use Each

Plumbing valves control water in your home three ways: they shut it off, they throttle the flow, or they protect the system. The common types are ball, gate, globe, check, angle stop, and pressure-reducing valves, plus gas shutoffs and mixing valves. Knowing which valve does what tells you exactly what to reach for in a repair and which ones you can trust to hold.

What are the main types of plumbing valves?

Most home plumbing uses six valve types. Ball and gate valves start and stop flow. Globe and butterfly valves throttle it. Check valves stop backflow, and pressure-reducing valves tame high street pressure. Angle stops isolate a single fixture, while gas shutoffs and mixing valves handle their own jobs. The table below maps each valve to its function, its best use, and how much you can rely on it.

The single most useful thing to know is a valve’s job: on/off isolation or throttling. Get that wrong and you wear out the seat or lose control of the flow. Use this as your decision table.

Ball valve vs gate valve: which should you use?

For a shutoff you touch every few years, choose a ball valve. It turns a quarter (90 degrees) from open to closed, seals tight, and rarely seizes. Gate valves cost a few dollars less and give a slightly straighter flow path, but their stem and gate corrode and stick, so an old one may snap or refuse to reseat. On reliability, the ball valve wins.

A ball valve works by rotating a bored ball inside the body. When the hole lines up with the pipe, water runs straight through; a quarter turn puts the solid side across the flow and stops it. Because nothing threads up and down through the water, there is little to corrode. The handle position also tells you at a glance whether the valve is open or shut.

A gate valve raises and lowers a metal wedge on a threaded stem, and it takes many turns of a round handle to move. Left open for years, the gate and stem sit in water and mineralize. Force a stuck one and the stem can shear, or the gate drops but will not seal fully, leaving a drip when closed. That is why plumbers replace old gate valves on the main with full-port ball valves.

Before an emergency, find your main and test it. Our guide on how to shut off water to your house shows where the shutoff usually sits and how to work it. If the handle is a round wheel that feels stiff, you likely have a gate valve worth replacing.

On/off valves vs throttling valves

Valves do one of two jobs: on/off isolation or throttling. Ball and gate valves are isolation valves, meant to sit fully open or fully closed, not parked halfway. Globe and butterfly valves are built to throttle, holding a partial-flow position without wearing out. Running an isolation valve half open wears the seat and can cause noise, so match the valve to the task.

Throttling means setting flow somewhere between off and wide open and leaving it there. A globe valve does this well because the plug seats against a ring, and partial contact does not chew up the seal. That same design forces water to change direction inside the body, which is why a globe valve drops pressure more than a ball valve of the same size.

If you crack a ball valve open just a little to slow a line, the high-velocity water erodes the ball and seat over time, and you may hear it hiss or hammer. Use it fully open or fully closed. For flow you want to dial in, such as an outdoor spigot or a hydronic loop, reach for a globe or butterfly valve instead.

Angle stops and fixture shutoff valves

An angle stop is the small fixture shutoff under a sink or behind a toilet, named for its 90-degree turn from inlet to outlet. A common size is 1/2 inch inlet by 3/8 inch compression outlet feeding the flexible supply tube. It lets you shut water to one fixture for a repair while the rest of the house keeps running.

Older angle stops are multi-turn globe-style valves, and they are the ones that seize after a decade untouched. Newer quarter-turn angle stops use a small ball inside and stay dependable. When you replace a faucet or toilet fill valve, exercise the stop first; if it will not turn or weeps at the packing nut, swap the stop while the wall is open.

A straight stop is the same idea when the supply comes up out of the floor instead of the wall, so the ports line up in a straight line rather than at an angle. Both isolate a single fixture, which saves you from killing water to the whole house for a five-minute job.

Check valves, PRVs, and specialty valves

Beyond shutoffs, several valves protect the system. A check valve allows flow in one direction only and prevents backflow into clean supply lines. A pressure-reducing valve drops high street pressure to a safe range, often 50 to 60 psi. Gas shutoffs use a quarter-turn like ball valves, and thermostatic mixing valves blend hot and cold to prevent scalding.

A check valve uses a spring or a hinged disc that opens with forward flow and snaps shut against reverse flow. It stops backflow that could pull dirty water into potable lines and keeps sump pumps, water heaters, and irrigation zones from draining backward. Many areas require a check valve on a sump discharge and on backflow-prone connections, depending on your state or local code.

A pressure-reducing valve, or PRV, protects the whole house when street pressure runs above roughly 80 psi, which can hammer fixtures and shorten the life of water heaters and washing machines. It uses a spring and diaphragm to hold downstream pressure steady. For the signs of a failing PRV and how to adjust or replace one, see our pressure-reducing valve guide.

Two more valves round out a typical home. A gas shutoff looks like a ball valve and turns a quarter, but it is rated for fuel gas and is not interchangeable with a water valve; leave gas work to a licensed pro where code requires it. A thermostatic mixing or tempering valve blends hot and cold at the water heater or shower to hold a safe outlet temperature and guard against scalding.

How to choose the right valve

Match the valve to the job, the pipe, and the fitting. Use ball valves for isolation, globe or butterfly valves for throttling, and a check valve where backflow is a risk. Then confirm the connection type: sweat (soldered), threaded, compression, push-to-connect, or PEX. The valve body and your pipe material have to agree, and local code may dictate what is allowed.

Connection method matters as much as valve type. A valve is joined to the line by soldering, threads, compression, push-fit, or a PEX crimp or expansion end, and the right choice depends on your pipe. Learn the connection options in our guide to plumbing fittings, and confirm what your lines are made of using our overview of the types of plumbing pipes.

Brass is the standard body material for residential shutoffs because it resists corrosion and handles household pressure well. For a main shutoff, buy a full-port ball valve so the opening matches the pipe and does not choke flow. When in doubt on a main line, gas valve, or anything a permit covers, hire a licensed plumber; requirements vary by region.

Frequently asked questions

What are the main types of plumbing valves?

Home plumbing relies on six main valves: ball, gate, globe, check, angle stop, and pressure-reducing valves. Ball and gate valves handle on/off shutoff, globe and butterfly valves throttle flow, check valves block backflow, and pressure-reducing valves lower street pressure. Gas shutoffs and thermostatic mixing valves cover fuel and temperature. Each has one clear job, so you match the valve to the task.

What is the difference between a ball valve and a gate valve?

A ball valve uses a rotating bored ball and turns a quarter (90 degrees) from open to shut, sealing tight and lasting for years. A gate valve raises a wedge with many turns of a wheel and gives slightly straighter flow, but its stem and gate corrode and seize over time. For reliable shutoff, most plumbers now install ball valves.

What valve is best for a main water shut-off?

A full-port ball valve is the best choice for a main water shut-off. The quarter-turn handle is fast in an emergency, the seal holds after years of sitting untouched, and it rarely sticks. Older homes often have a gate valve on the main. If it feels stiff or leaks at the stem, replace it before it fails during a real leak.

What is an angle stop valve?

An angle stop is a small shutoff valve at each fixture, under sinks and behind toilets, where it turns the supply 90 degrees toward the tap. A typical size is 1/2 inch inlet by 3/8 inch compression outlet. It isolates one fixture so you can repair a faucet or toilet without shutting water to the whole house.

What does a check valve do?

A check valve lets water flow one direction only and closes automatically against reverse flow. It prevents backflow that can pull dirty water into clean supply lines, and it keeps pumps, water heaters, and irrigation from draining backward. Common designs use a spring or a swing disc. Many areas require one on sump pumps and backflow-prone connections, depending on local code.

Do gate valves go bad?

Yes. Gate valves fail more often than ball valves because the metal stem and gate sit in water and corrode. Parked open for years, the gate can stick, and the stem may snap when you finally force the wheel. A worn gate also fails to reseat fully, so it drips when closed. If yours is old and stiff, plan to replace it.

Last reviewed: September 2026.