Water pressure issues are more common in Melbourne than most homeowners realise — and they’re responsible for a surprising number of plumbing failures, from flexi hose bursts to appliance damage. The culprit is often a failed or incorrectly set pressure limiting valve (PLV).
What Is a Pressure Limiting Valve?
A pressure limiting valve (PLV) is a device installed on your water supply line that reduces incoming mains pressure to a safe level for household use. Melbourne’s water network delivers water at pressures of up to 1,000 kPa (kilopascals). Household plumbing, fixtures, and appliances are designed to operate between 200 and 500 kPa.
Without a PLV, or with a failed one, your pipes and appliances are exposed to damaging pressure that dramatically shortens their lifespan and increases burst risk.
Signs Your PLV May Be Failing
- Water hammer: Banging or knocking pipes when taps are turned off quickly — a sign of excessive pressure spikes
- Repeatedly leaking tap washers: High pressure causes washers to fail faster than normal
- Leaking tempering valve or relief valve: The T&P relief valve on your hot water system will release if the PLV isn’t controlling pressure
- Very high flow rate from taps: If your shower or taps feel unusually forceful, pressure is likely above the normal range
- Flexi hose failure: High pressure is a major contributor to flexi hose rupture
Signs of Low Water Pressure
- Weak flow at taps, showers, or garden taps
- Hot water system struggling to reach temperature (continuous flow systems require minimum inlet pressure)
- Inconsistent pressure when multiple outlets are used
Low pressure can be caused by a PLV set too low, a PLV that has failed closed, pipe restrictions, or issues with your council supply connection.
PLV Replacement Cost in Melbourne
- PLV replacement (supply + installation): $300–$600
- PLV adjustment (if just needs calibrating): $150–$250
PLV replacement is licensed plumbing work and must be done by a VBA-licensed plumber with a Certificate of Compliance issued.
Where Is My PLV Located?
The PLV is usually located at the water meter or near the water main entry point to the house. It looks like a brass fitting with an adjustable cap and a lock nut. If you can’t find it or don’t know if your property has one, a plumber can check.
Sedcon Plumbing tests and replaces PLVs across Melbourne. If you have water pressure issues, call us first — it’s often a quick fix. Call 0468 013 012 | VBA Lic. 120392