Holman 25mm Solenoid Valve with Flow Control – 24VAC Irrigation Valve, Female BSP Thread

Holman 25mm Solenoid Valve with Flow Control for Garden Irrigation

The Holman 25mm Solenoid Valve with Flow Control is a 24VAC irrigation valve that turns a watering zone on and off automatically from your irrigation controller. It has a 25mm (1") female BSP threaded connection, a maximum rated pressure of 1000kPa, a flow control for adjusting each zone, and a removable bleed screw that doubles as a manual on and off switch. It is made for landscape and garden irrigation and works with conventional irrigation controllers.

A Valve Built Around Everyday Garden Zones

Most home irrigation systems split the garden into zones, such as front lawn, back lawn, garden beds and pots, with one solenoid valve for each. This 25mm valve suits the typical flow of a residential zone, whether it feeds pop-up sprays, rotors or a drip line. When the controller sends a 24VAC signal, the valve opens and waters that zone, then closes when the program ends, so each area gets its own schedule.

Why Flow Control Matters on Home Systems

Household water pressure is often higher than a single zone actually needs, and zones rarely have the same number of sprinklers. The flow control lets you limit how far the valve opens, which reduces flow to a zone that is over-watering, cuts misting from spray heads caused by high pressure, and helps balance zones so each one waters evenly. It is especially handy on smaller or lower flow zones, and you can also turn it fully down to shut off a zone while you work on it.

Bleed Screw for Flushing and Manual Watering

After installation, dirt or sand can get into a new valve. The removable bleed screw lets you flush the valve to clear that debris before it causes problems. The same screw works as a manual on switch: loosen it to open the valve and water by hand without the controller, then tighten it again to return the valve to automatic operation.

Key Features and Benefits

• 25mm (1") female BSP threaded connection
• 24VAC operation, compatible with conventional irrigation controllers
• Flow control to adjust or shut off each zone
• Removable bleed screw for flushing after installation
• Bleed screw doubles as manual on and off
• Rated to a maximum pressure of 1000kPa
• Designed for landscape and garden irrigation systems

Product Details

• Brand: Holman
• Size: 25mm (1")
• Connection: Female BSP thread
• Voltage: 24VAC
• Maximum pressure: 1000kPa
• Flow control: Yes
• Manual operation: Via bleed screw

Setting Up and Maintaining the Valve

Install the valve in a valve box with the flow arrow pointing in the direction of water flow, using thread tape on male BSP fittings and tightening firmly by hand without forcing plastic threads. Connect one solenoid wire to the controller's common wire and the other to the zone's station wire, with waterproof gel-filled connectors on every join. Before connecting the downstream pipe for the first time, or after any repair, open the bleed screw and flush the valve to clear grit. Once the system is running, set the flow control zone by zone while watching the sprinklers, and check valves at the start of each season for leaks, sticking or debris.

Frequently Asked Questions

How do you adjust the flow control stem on a Holman 25mm solenoid valve?
Run the zone, then turn the flow control handle clockwise to reduce flow or anticlockwise to increase it. Watch the sprinklers as you adjust and stop when the spray pattern looks right with no misting. Turning it fully clockwise will shut the zone off.

Why is flow control necessary on residential solenoid valves?
Mains pressure is often higher than a zone needs, and zones have different numbers of sprinklers. Flow control lets you reduce flow to balance zones, prevent over-watering and cut misting from spray heads.

How do you fix a stuck open 25mm Holman solenoid valve?
First check the controller is not still running the zone and that the bleed screw is fully tightened, as a loose bleed screw keeps the valve open. If it still will not close, turn off the water, remove the bonnet and clean any grit from the diaphragm and small ports, then flush the valve. Replace the diaphragm if it is torn or damaged.

How do I turn the valve on manually?
Loosen the bleed screw to open the valve and water without the controller. Tighten it again to close the valve and return it to automatic operation.

What pressure can it handle?
It is rated to a maximum pressure of 1000kPa. If your mains pressure is high, a pressure reducer upstream helps protect the valve and the rest of your irrigation system.

Where can I buy a Holman flow control valve in Sydney?
The Holman 25mm Solenoid Valve with Flow Control is available online from BPG Supplies, with local pickup from our store in Bonnyrigg in Sydney's south-west and delivery across Australia.