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The Solenoid Valve: An Electromagnet That Opens a Pipe
Youblob (generated from this blueprint's notebook) · CC0
Emma

Yenziwe ngu-

Emma

27. uMandulo 2026SE
6
0
0
0
0

The Solenoid Valve: An Electromagnet That Opens a Pipe

A relay lets a small current switch a large one. A solenoid valve does the same for a fluid: a coil round a tube pulls a soft-iron plunger that opens or closes an orifice, so a switch, a thermostat or a timer can turn water, air, gas or oil on and off without a hand on the valve. Washing machines, irrigation timers, compressors and boilers all use them. The Automatic Switch Company (ASCO) of New York is credited with making the first solenoid valves in 1910. This rung works out why a solenoid's pull depends so steeply on its air gap, why that limits a direct-acting valve's orifice, and how a pilot valve gets round it — then drives a real 12 V valve from a switch and measures when it will and will not open.
Oqalayo
About 3 hours

Imiyalelo

1

Pull against gap, and the orifice it can open

Ilayisha incwadi ye-Jupyter…
2

The same electromagnet, switching a current

A solenoid valve is an electromagnet pulling an armature, as in a relay. The embedded blueprint builds the relay the idea came from.
3

Measure a solenoid's pull against its gap

Take a small 12 V push-pull solenoid. Clamp it upright and hang its plunger from a spring scale, with a nut on the scale's hook so you can set the gap between the plunger's end and the coil's stop with feeler gauges. At each gap switch the coil on from the power supply and read the pull. Plot pull against gap: it rises steeply as the gap closes, as the notebook's $1/g^2$ says, then levels off as the iron saturates. Watch the coil current on the supply's meter: it does not change with the gap — the current sets the ampere-turns, the gap sets the pull.

Izinto zokwakha zalesi sinyathelo:

I-solenoidI-solenoid1 ucezu
Izintambo ZokuxhumaIzintambo Zokuxhuma1 ucezu

Amathuluzi adingekayo:

Umthombo kagesi we-DCUmthombo kagesi we-DC
Isilinganiso Samandla (Isikali Sensimbi Esontekile)Isilinganiso Samandla (Isikali Sensimbi Esontekile)
Isethi yezilinganiso zesikhalaIsethi yezilinganiso zesikhala
Isibambo SebhentshiIsibambo Sebhentshi
Isilinganisi sikagesi esiyinhlanganiselaIsilinganisi sikagesi esiyinhlanganisela
4

Drive a real valve, and find where it stops opening

Plumb a 12 V solenoid valve between a garden hose (through a ball valve and pressure gauge) and an open outlet into a bucket, with the valve's arrow pointing downstream. Wire the coil to the power supply through a push button. Press the button and water flows; release it and it stops. Now close the ball valve until the gauge reads almost nothing and try again: many small 12 V valves are pilot-operated and will not open at all at very low pressure — they need a pressure difference to lift their diaphragm. Note the lowest pressure at which it opens, and check the valve's plate or data sheet for its minimum operating pressure.

Izinto zokwakha zalesi sinyathelo:

12V Solenoid Valve - 19mm12V Solenoid Valve - 19mm1 ucezu
Ipayipi lengadiIpayipi lengadi1 ucezu
Ivalvu eyibhola yethusiIvalvu eyibhola yethusi1 ucezu
Itheyiphu ye-PTFE yokuvala izintamboItheyiphu ye-PTFE yokuvala izintambo1 ucezu
Inkinobho yokucindezelaInkinobho yokucindezela1 ucezu
AmanziAmanzi20 amalitha

Amathuluzi adingekayo:

Umthombo kagesi we-DCUmthombo kagesi we-DC
Isilinganiso SengcindeziIsilinganiso Sengcindezi
Isipanela esilungisekayoIsipanela esilungisekayo
IbhakedeIbhakede
5

A solenoid valve that will not behave

Solenoid valve faults in the order to check them.

Flow

Loading...
6

History and honest limits

The **Automatic Switch Company** (ASCO), founded in New York, is credited with the first solenoid valves, in 1910. Direct-acting and pilot-operated valves of every size now follow the same two patterns. **Honest limits.** The notebook's pull formula counts only the air gap and ignores the iron's own reluctance and leakage flux; real solenoids give less. A coil held on continuously warms, and its resistance and pull fall as it does. Never use a water valve for gas or fuel: those need valves certified for them.

Izinto

8

Amathuluzi Adingekayo

8
Isamba Esilinganiselwe
Lokho umenzi akuthenga. Izinto ezikhonjiswa ngaphandle kwentengo uzithola lapho uzithenga khona.
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