Pool Valves 101 (Everything Except the Multi-Port)
Your circulation system relies on a handful of shut-off and diverter valves to route water, isolate equipment and stop backflow. Get them wrong and you can run a pump dry, stall a heater, half-drain a spa or even cause a valve to explode.
1. Common Valve Types in Australia
| Valve type | Where you’ll see it | Quick ID check |
|---|---|---|
| PVC Ball Valve (2-way) | On suction returns, solar lines, chemical feeders | Red/blue handle turns 90°; simple open/closed |
| NeverLube / Lube-Free Diverter (2- or 3-way) | “Jandy-style” valves on suction & return manifolds | Wide black handle rotates 180°; lid held by six screws |
| Union Ball Valve | Before/after heat pumps, salt cells | Built-in unions for easy removal |
| Swing/Flapper Check Valve | After pumps, in solar returns | Transparent body or removable lid; one-way flap inside |
| Spring Check / Non-Return | Heater bypass, chemical injectors | Small barrel with arrow; flow only in one direction |
| Knife-Gate Valve | Older concrete pools & commercial sites | Flat blade pulled up/down with T-handle |
2. How to Read the Handle (Brand-by-Brand)
Manufacturers love to be “special” about which way closed is. Use the cheat sheet below before you crank a handle and wonder why nothing happens.
| Brand & model (AU market) | Closed position | Open position | Notes |
|---|---|---|---|
|
Jandy NeverLube / Gray-2 (2- or 3-way diverter) |
Handle inline with the port you’re closing | Handle perpendicular to flowing port | Opposite of a ball valve—the handle covers the blocked port. |
| Waterco 3-Way Diverter | Pointer on lid aimed at OFF embossing | Pointer aimed at desired flow arrow | Grey body, yellow pointer. |
| AstralPool / Hurlcon 3-Way Diverter | Red pointer on lid aimed at CLOSED stamp | Pointer in direction of flow | Uses a removable stop-pin to allow 180 ° swing. |
| Davey “SupaFlo” PVC Ball Valve | Handle perpendicular to pipe | Handle inline with pipe | Standard ISO PVC ball valve. |
| Onga / Pentair Union Ball Valve | Handle perpendicular | Handle inline | Same convention as domestic plumbing. |
| Emaux Check Valve (clear) | N/A – one-direction flap | Arrow on body shows permitted flow | Opens automatically when pump runs. |
| Bosta Knife-Gate | T-handle all the way down | Blade pulled fully up | Locking pin prevents vibration slip. |
Easy rule:
Ball valves (red/blue handles) follow household plumbing: inline = open, across = closed.
- Jandy-style do the opposite: the handle hides the port you just shut.
Example: Jandy Three-Way Valve
3. Typical Valve Jobs & Best-Practice Tips
| Task | Valve moves | Pro tip |
|---|---|---|
| Vacuum to waste | Close skimmer valve, half-open main-drain (ball valves) | Mark normal positions with a paint pen so you can reset them. |
| Isolate pump for service | Close suction & return ball valves; open check-valve lid to release pressure | Depressurise before cracking unions to avoid a face-full. |
| Heat-pump bypass | 3-way diverter splits flow: 80 % heater / 20 % bypass | Add a spring-check on the bypass to stop reverse flow when heater’s off. |
| Spa spill-over mode | 3-way diverter sends all suction to spa drain, all return to spa jets | Use adjustable stop-pins so the family can’t dead-head the pump by mistake. |
4. Maintenance Cheats
-
Exercise valves quarterly – ½-turn back and forth prevents O-rings from sticking.
-
Silicone lube only – Petroleum grease swells rubber seats.
-
Replace diverter O-rings every 3–4 years – Cheap kit, five-minute job.
-
Check-valve lids – Clear bodies cloud over; swap if you can’t see the flap seat.
-
Label spa/pool positions with a Brother label or paint marker—future-you will say thanks.
5. When a Valve Won’t Budge
-
Heat + age bake scale onto the stem. Gently warm the body with a hair-dryer (not a heat gun) and try again.
-
O-ring swelled: remove the lid, clean the groove, fit a new seat lube-free.
-
Handle stripped: Most diverter and ball-valve handles slide off a square stem—swap just the handle before you reach for a hacksaw.
Take-Home
Learning which way your handles point saves water, electricity and a load of filter grief. Ball valves act like domestic taps (handle inline = water on); Jandy-style diverters do the reverse (handle hides the closed port). Commit the cheat sheet to memory—or stick it on the pump shed door—and your future valve gymnastics will be leak-free and low-stress.
Need help mapping a spaghetti-looking manifold? Snap a photo and email it through; advice is on the house.