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Irrigation Valves
Valves are how a drip system is controlled — opening and closing zones, isolating a leak, and (with solenoids) running on a schedule. The right valve in the right place is what makes a multi-zone system possible.
Why zoning runs on valves
A drip system is divided into zones — blocks that are irrigated independently. Each zone starts at a valve, and that valve is the zone's on/off. Zoning exists for three reasons: the pump can't irrigate the whole field at once (pressure and run time), different crops need different schedules, and a leak should be isolable to one block without shutting the farm down. Every one of those jobs is a valve job.
See how zones fit into the full design in the system design guide.
The valve types
| Valve | How it works | Where it's used |
|---|---|---|
| Ball valve | Quarter-turn; full open or full closed; the workhorse | Zone isolation, line ends, general small-system work — the most common valve in Kenyan drip systems |
| Butterfly valve | Half-turn disc in the line; compact | Larger mainlines where a ball valve is bulky or overkill |
| Diaphragm valve | Diaphragm lifts against pressure; gentle flow control | Filtration (backwash), fertigation lines, where smooth opening matters |
| Solenoid valve | Electrically actuated; opens/closes on a signal | Automated zones — driven by a timer or controller |
| Anti-siphon / check provision | Prevents backflow into the source | Where the source is a protected supply (tank, borehole) — a hygiene requirement, not a nicety |
How many valves, where
The minimum that makes a system workable: one valve per zone at the zone head, plus an isolation valve at the head (after the filter), plus flush points (valved or capped ends) on every drip line so it can be flushed without draining the field. At commercial scale, each block carries its own head assembly — valves, and usually a pressure gauge pair on the filter and at the zone end, because reading the system beats guessing at it.
Valve count follows zone count, which follows the crop and layout — the design fixes it, typically 2–4 valves on a smallholder system and 8–20+ on commercial ones.
Solenoid valves and automation
A solenoid is a valve with an electric brain: a signal opens it, its absence closes it. That's the whole interface between your controller and the field — one wire per zone. Two practical notes: size the solenoid to the zone's flow (an undersized solenoid chokes the zone) and route the wiring with the pipework from day one — retrofitted solenoid wiring is always messier than planned wiring. See automated irrigation for the levels of control.
Materials and durability
Standard valves are brass or PVC; in the field, the failure points are rarely the valve body — it's the actuator (grip wear on a ball valve turned every day), the seat (a ball valve that no longer seals flat leaks and drops zone pressure), and the connection (the fitting, not the valve, is usually what fails). The fittings page covers the connection side. On maintenance: a valve that's used weekly doesn't need service, but a valve that's sealed for a season should be cycled at start-up — stuck valves are a start-of-season classic, covered in the common problems guide.
Choosing valves
Sequence: zone count from the layout → ball or butterfly by pipe size → solenoid where automated → diaphragm where flow control or backwash is needed → check provision on protected sources. It's one section of the design document, priced line by line. For your system's specification: request a quote.
Related
Go deeper
Designing zones for your farm?
Send your block layout — we'll set the zone structure, valves and (optionally) automation.