Hunter Irrigation Valves: 6 Essential Models That Control Your Water Flow

Last updated: August 2025 | Reading time: 9 minutes

Quick Summary: An irrigation solenoid valves is the workhorses of your sprinkler system, controlling water flow to each zone. Understanding valve types, installation, and troubleshooting can save hundreds in repair costs and prevent landscape damage from irrigation failures.

Shop Hunter PGV and ICV solenoid valves.

What are Hunter Irrigation Valves?

Hunter irrigation valves are electro-mechanical devices that control water flow to individual irrigation zones in your sprinkler system. Each valve receives electrical signals from your irrigation controller and opens or closes to start and stop watering for specific areas of your landscape.

These precision-engineered valves feature Hunter’s renowned reliability and are designed to operate flawlessly for years under Australian conditions, from extreme heat to varying water pressures and quality.

How Hunter Irrigation Valves Work

Basic Operation Principle

Solenoid Activation: When your irrigation controller sends a 24-volt AC signal, the solenoid creates a magnetic field that lifts a plunger inside the valve.

Diaphragm Action: The plunger releases water pressure above a flexible diaphragm, causing the diaphragm to lift and allow main water flow through the valve.

Zone Watering: Water flows through the open valve to sprinkler heads in that specific zone until the controller signal stops.

Automatic Closure: When the electrical signal ends, the plunger drops, water pressure builds above the diaphragm, and the valve closes, stopping water flow.

Hunter System Excellence: Control your valves remotely with Hunter WiFi sprinkler controllers for automated scheduling. Large areas require Hunter rotor sprinklers for optimal coverage. Save water with Hunter MP Rotators retrofits. Remote locations benefit from Hunter Node controllers.

Hunter Irrigation Valve Models

Hunter PGV Series (Professional Grade Valve)

Best for: Residential and light commercial systems on clean mains water

• Sizes: 25mm (1″), 40mm (1½”), 50mm (2″)
• Pressure: 20–150 PSI (up to 1,035 kPa) recommended operating range
• Construction: Heavy-duty UV-resistant PVC, double-beaded leak-proof diaphragm
• Features: Internal and external manual bleed, low-flow capability for drip zones, flow control standard on 40mm and 50mm, optional DC latching solenoid for battery controllers
• Warranty: 2 years
• Ideal Use: Home gardens and standard irrigation systems — Hunter’s most popular valve worldwide

Hunter PGV Jar-Top (25mm)

Best for: Residential systems where fast, tool-free servicing matters

• Same specifications as the standard 25mm PGV
• Screw-off “jar top” lid for the fastest valve servicing in the industry — no tools required
• Available with or without flow control

Hunter ICV Series (Commercial Grade)

Best for: High pressure systems, bore and dam water, commercial sites

• Sizes: 25mm (1″), 40mm (1½”), 50mm (2″), 80mm (3″)
• Pressure: 20–220 PSI (up to 1,500 kPa) — Hunter’s highest-rated plastic valve
• Construction: Glass-filled nylon body (strength comparable to brass), fabric-reinforced EPDM diaphragm and seat
• Features: Flow control standard on all sizes, reverse-porting solenoid with built-in pressure-surge and water-hammer protection, optional Filter Sentry self-cleaning filter for dirty water, reclaimed-water version with purple chlorine-resistant diaphragm
• Warranty: 5 years
• Ideal Use: Commercial landscapes, parks and sports grounds, bore and dam supplies, pressure-boosted systems

Hunter IBV Series (Brass Valve)

Best for: Installations where brass is specified

• Sizes: 25mm (1″), 40mm (1½”), 50mm (2″)
• Construction: Heavy-duty brass body for maximum durability
• Ideal Use: Municipal and commercial systems with brass specifications

Choosing the Right Hunter Valve

PGV vs ICV: Which One Do I Need?

Choose the PGV if: you’re on clean mains/town water, your pressure is under 150 PSI (about 1,000 kPa), and it’s a home garden or light commercial system. For the large majority of Australian residential installations, the PGV is the right valve and the better-value choice.

Choose the ICV if any of these apply:

• Your water comes from a bore, dam, pond, creek, or reclaimed source — add the Filter Sentry option so the valve keeps itself clear of debris
• Your system runs at high pressure (up to 220 PSI / 1,500 kPa) or off a pressure-boosted supply
• It’s a commercial site — parks, schools, sports grounds — where downtime is expensive
• You want the longest service life: glass-filled nylon construction and a 5-year warranty versus the PGV’s 2 years

Both valves accept Hunter’s DC latching solenoid for battery-powered Node controllers, and both take the Accu Sync pressure regulator.

Sizing Your Valve

Select valve size on flow and pressure loss, not just pipe size — the valve is often smaller than the pipe it’s installed on.

• 25mm: up to about 150 L/min — most home systems
• 40mm: about 75–450 L/min — large residential and light commercial zones
• 50mm: about 150–570 L/min — big zones and mainline duty
• 80mm ICV: very large commercial flows

Hunter Valve Installation Guide

Pre-Installation Planning

Valve Box Selection: Choose appropriately sized valve boxes to accommodate valves plus service clearance. Allow space for future maintenance access.

Depth Requirements: Install valves in a valve box typically 200–300mm deep for protection and access — deeper in frost-prone alpine and tablelands regions.

Drainage Considerations: Ensure valve boxes have adequate drainage to prevent water accumulation and valve damage.

Installation Process

1. Excavate Valve Location: Dig hole large enough for valve box plus working space around valve
2. Install Valve Box: Set valve box level with surrounding grade, ensuring lid access isn’t obstructed
3. Connect Supply Pipe: Install supply line to valve inlet using appropriate fittings and pipe sealant
4. Connect Zone Piping: Attach downstream piping to valve outlet leading to sprinkler heads
5. Install Valve: Mount valve in box ensuring adequate clearance for maintenance access — arrow on the valve body must point downstream
6. Connect Control Wires: Attach low-voltage control wires to valve solenoid terminals
7. Test Operation: Manually test valve operation before backfilling and system startup
8. Backfill and Grade: Carefully backfill around valve box, maintaining proper drainage

Valve Wiring and Electrical Connections

Control Wire Specifications

Wire Gauge: Use quality multi-core irrigation cable (0.5mm² or heavier for longer runs) for most residential applications.

Wire Count: One common wire plus one control wire per valve (e.g., 7-core cable for a 6-valve system).

Burial Depth: Bury control wires at least 150mm deep, following local electrical codes.

Wiring Best Practices

Waterproof Connections: Use waterproof wire connectors designed for direct burial applications.

Wire Splicing: Make all wire connections inside valve boxes for easy access and troubleshooting.

Labeling: Label all wires clearly to identify which valve each wire controls for future maintenance.

Spare Wire: Include spare wires in cable runs for future expansion or wire failure backup.

Hunter Valve Maintenance

Seasonal Maintenance Schedule

Spring Startup (September–October):

• Manually test each valve operation
• Check for leaks around valve body and fittings
• Clean debris from valve boxes
• Verify proper electrical connections

Summer Monitoring (November–February):

• Weekly visual inspection during system operation
• Check for signs of valve malfunction (continuous running, no operation)
• Monitor water pressure and flow rates
• Clear vegetation growth around valve boxes

Autumn Service (March–April):

• Deep clean valve boxes and drainage
• Inspect valve diaphragms for wear
• Test solenoid electrical resistance
• Document any needed repairs for winter service

Winter Maintenance (May–August):

• Disassemble and service problematic valves
• Replace worn diaphragms and internal components
• Test and replace faulty solenoids
• Plan system expansions or modifications

Preventive Maintenance Tasks

Annual Diaphragm Inspection: Remove valve top and inspect diaphragm for cracks, mineral buildup, or wear that could cause valve failure.

Solenoid Testing: Test solenoid electrical resistance (typically 20–60 ohms) to identify failing components before complete failure.

Flow Control Adjustment: Adjust valve flow control to optimise pressure and flow for each zone’s specific requirements.

Troubleshooting Hunter Valve Problems

Valve Won’t Turn On

Possible Causes: Faulty solenoid (most common), broken control wire, controller programming issue, low voltage at valve.

Diagnostic Steps:

1. Test solenoid with multimeter (should read 20–60 ohms)
2. Check voltage at valve during operation (should be 24VAC)
3. Verify controller programming and fuse condition
4. Inspect wire connections for corrosion or damage

Solutions: Replace solenoid if resistance is incorrect; repair or replace damaged control wires; reprogram or replace controller; clean connections and apply dielectric grease.

Valve Won’t Turn Off

Possible Causes: Debris under diaphragm, torn or warped diaphragm, stuck solenoid plunger, excessive downstream pressure.

Diagnostic Steps:

1. Turn off controller and check if valve closes
2. Remove valve top and inspect diaphragm
3. Check for debris in valve chamber
4. Test solenoid plunger movement

Solutions: Clean debris from valve chamber and diaphragm area; replace damaged diaphragm; replace faulty solenoid assembly; install pressure regulation if pressure is excessive. On dirty water supplies, upgrading to an ICV with Filter Sentry prevents the problem recurring.

Low Water Pressure from Valve

Possible Causes: Partially clogged valve screen, flow control set too low, undersized valve for application, upstream pressure problems.

Diagnostic Steps:

1. Check flow control adjustment
2. Remove and inspect internal screen
3. Measure upstream water pressure
4. Compare valve size to zone requirements

Solutions: Clean or replace internal screen; adjust flow control to increase flow; upgrade to larger valve if undersized; address upstream pressure issues.

Valve Cycling On and Off

Possible Causes: Electrical interference or poor connections, controller malfunction, solenoid overheating, voltage fluctuations.

Diagnostic Steps:

1. Check all electrical connections for tightness
2. Test with different controller zone
3. Monitor voltage stability during operation
4. Check for nearby electrical interference sources

Solutions: Tighten all electrical connections; replace controller if malfunctioning; replace overheating solenoid; install electrical surge protection.

Valve Replacement Guidelines

When to Replace vs Repair

Replace Valve When: valve body is cracked or damaged; multiple internal components have failed; valve is significantly undersized for current needs; repair costs approach replacement cost.

Repair Valve When: only diaphragm or solenoid needs replacement; valve body and major components are in good condition; simple cleaning or adjustment resolves issues; valve size is appropriate for application.

Replacement Process

1. System Shutdown: Turn off water supply and irrigation controller
2. Drain Lines: Open downstream manual drains or sprinkler heads to relieve pressure
3. Disconnect Wiring: Remove electrical connections, noting wire positions
4. Remove Old Valve: Cut or unthread valve from piping system
5. Install New Valve: Connect new valve using appropriate fittings and sealants, arrow pointing downstream
6. Reconnect Wiring: Attach control wires to new valve solenoid
7. Test Operation: Verify proper valve operation before covering

Water Quality and Valve Performance

Hard Water Considerations

Mineral Buildup Prevention: Regular cleaning and descaling extends valve life in areas with hard water or high mineral content.

Dirty Water: Bore, Dam, and Reclaimed Supplies

Filter Sentry: On bore, dam, pond, or reclaimed water, choose the ICV with the Filter Sentry option — its self-cleaning mechanism scrubs the valve’s filter screen every cycle, keeping debris out of the valve internals.

Screen Filters: Install upstream filtration to protect sprinklers and drip emitters — the valve’s filter protects the valve, not the equipment downstream.

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Keep Your Irrigation System Running Smoothly

Ensure reliable irrigation performance with quality Hunter valves. From residential gardens to commercial landscapes, we have the right valve solution.

Shop Hunter Irrigation Valves

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Frequently Asked Questions

What’s the difference between Hunter ICV and PGV valves?

The PGV is Hunter’s residential and light commercial valve — a reliable, great-value workhorse for clean mains water, rated to 150 PSI with a 2-year warranty. The ICV is the commercial-grade valve: glass-filled nylon construction rated to 220 PSI, a 5-year warranty, and an optional Filter Sentry self-cleaning filter for bore, dam, and reclaimed water. Town water and a home garden → PGV; dirty water, high pressure, or commercial duty → ICV.

How long do Hunter irrigation valves typically last?

With proper maintenance, Hunter valves typically last 8–15 years in residential applications. Commercial applications or harsh water conditions may require more frequent servicing — the ICV’s heavier construction and 5-year warranty make it the better choice in those conditions.

Can I repair a Hunter valve myself?

Basic maintenance like diaphragm replacement is DIY-friendly — the PGV Jar-Top makes it especially easy. Electrical troubleshooting beyond simple solenoid swaps is best done by a qualified professional.

Why does my valve keep running after the controller turns off?

This usually indicates debris under the diaphragm or a damaged diaphragm. Turn off the water supply and disassemble the valve top to inspect and clean internal components. If you’re on bore or dam water and this keeps happening, an ICV with Filter Sentry solves it permanently.

What causes a valve to short cycle (turn on and off repeatedly)?

Short cycling typically results from electrical problems like loose connections, controller issues, or voltage fluctuations. Check all electrical connections first.

How do I know what size valve I need?

Match the valve to your zone’s flow rate and acceptable pressure loss, not just pipe size. Most home systems use 25mm valves; large properties may need 40mm or 50mm. If unsure, contact us with your flow and pressure details and we’ll size it for you.

Can I install multiple valves in one valve box?

Yes, but ensure adequate space for maintenance access. Large valve boxes can accommodate 2–4 valves depending on size and local requirements.

Do Hunter valves work with battery-powered controllers?

Yes — both the PGV and ICV accept Hunter’s DC latching solenoid (P/N 458200), which is what the battery-powered Hunter Node controllers use. Our Node valve kits come with the latching solenoid included.

Why is my valve box always full of water?

This usually indicates poor drainage, a leaking valve, or a damaged valve box. Improve drainage and check valve seals to resolve water accumulation.