Every tap in your home relies on a valve to start and stop the flow of water, and the type of valve inside determines how the tap feels, how long it lasts and how it fails when it finally wears out. After clearing more than 20,000 drains and servicing taps in thousands of Perth homes over 25 years, we can usually tell what sort of valve is inside a tap before we open it up, simply from the way it drips. Here is what sits behind the handle and why it matters.
Compression valves
The compression valve is the oldest design and still the most common in Perth homes built before the 1990s. Turning the handle screws a spindle down onto a rubber washer, which presses against a brass seat to close off the water. It is a simple, repairable mechanism, and that simplicity is its strength. The weakness is the washer itself. Rubber hardens, splits and compresses over time, and Perth’s mineral rich water accelerates the wear by scoring the brass seat underneath. A compression tap that drips after it is turned off almost always needs a new washer, and sometimes a reseating of the valve body as well.
Ball valves
Ball valves are found mostly in single lever kitchen mixers. A slotted metal or plastic ball sits inside the tap body, and moving the lever rotates the ball so its openings align with the hot and cold inlets. Because one movement controls both temperature and flow, there are more parts inside than any other tap type, including springs, seals and O rings. That means more points of failure. A ball valve mixer that leaks from the base of the lever usually has a worn O ring, while a drip from the spout points to the inlet seals. Repair kits exist, but on cheaper mixers replacement is often the more sensible path.
Cartridge valves
Cartridge taps replace the washer and spindle arrangement with a single removable cartridge that controls flow through internal channels. They operate with a smooth quarter or half turn and are common in mixers installed from the 2000s onward. When a cartridge tap fails, you replace the whole cartridge rather than hunting for individual washers, which makes repairs quick provided the correct replacement can be matched. The catch is that cartridges are rarely interchangeable between brands, so identifying the manufacturer before pulling the tap apart saves a second trip to the supplier.
Ceramic disc valves
Ceramic disc valves are the modern standard and the type we recommend when clients upgrade tapware. Two polished ceramic discs sit face to face inside the valve. One is fixed and one rotates, and water flows only when the openings in both discs line up. The discs are harder than steel, unaffected by hot water and highly resistant to the scale that destroys rubber washers. A quality ceramic disc tap will commonly outlast every other component in the bathroom. When they do eventually fail, it is usually because a piece of grit or debris has scratched a disc, which is one reason we recommend flushing lines after any pipe work.
Why valve type matters for your plumbing
Valve choice affects more than drips. Compression taps close gradually, which is gentle on your pipes. Quarter turn ceramic taps close almost instantly, and in homes with high water pressure that sudden stop can create water hammer, the banging sound of pressure shockwaves travelling through the pipework. If new quarter turn taps have introduced banging pipes, the fix is usually pressure regulation or arrestors rather than swapping the taps back.
Valves also matter for isolation. Every fixture should have a working isolation valve underneath it so a single tap can be serviced without shutting water to the whole house. In many older Perth homes those small valves have seized from decades of sitting untouched, and the first time anyone discovers this is during an emergency. Testing them once a year takes seconds and can save a great deal of water damage.
When to repair and when to call a plumber
Replacing a washer in a compression tap is one of the few plumbing tasks a homeowner can legally and safely handle in Western Australia. Anything beyond that, including replacing tapware, repairing mixers connected to flexi hoses or working on anything downstream of the isolation valve, is licensed work. If a tap keeps dripping after a washer change, if the handle is stiff or grinding, or if you cannot isolate the water to work on it safely, it is time to bring in a professional. Our licensed team can identify the valve, source the right parts and sort the repair in a single visit, and while we are there we will give the rest of your plumbing a free health check. If a dripping tap has been on your list for months, one call to Drains Plus gets it off the list for good.
A quick word on identification, since knowing what you have saves time and money. Two separate handles that take multiple full turns to open are compression valves. Two handles that move through a crisp quarter turn are ceramic disc. A single lever on a dome shaped body is usually a ball valve, while a single lever on a slimmer cartridge body is, unsurprisingly, a cartridge mixer. If the tapware carries a brand name anywhere on the body or flange, photograph it before calling a plumber or visiting a supplier, because matching internal parts by brand is faster and more reliable than matching by appearance.
It is also worth understanding the relationship between valves and Perth water. Our supply carries a higher dissolved mineral content than most eastern states cities, and that mineral load is hard on every valve type in a different way. It scores the brass seats under compression washers, stiffens the rotation of ball and cartridge mechanisms and coats the small waterways inside mixers. Taps in Perth simply lead harder lives, and choosing quality ceramic disc tapware over budget alternatives typically pays for itself in the years between repairs.
