---
title: Solenoid
tags: pneumatics
---

A **solenoid** is a [pneumatics](pneumatics)
component that allows electronic control of air pressure flow.

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## Connections


### Input

All solenoids have one input. This should come directly from a [pressure
regulator](pressure-regulator). Uses either a
quick connect connector or is threaded for a 1/8" brass fitting.


### Output

Solenoids have two outputs, they go to each end of a
[cylinder](pneumatic-cylinder). Uses either a quick connect (1/4"
OD) connector or is threaded for a 1/8" NPT brass fitting.


### Electrical input

Solenoids usually have a wire leads or a proprietary connector. They are
connected to a [spike](spike-relay) for controlling.


## Types


### Single Solenoid

Single solenoids apply pressure to one end of the
[cylinder](pneumatic-cylinder) until a voltage is applied to the
signal input, then the pressure is applied to the other end.


### Double Solenoid

Double solenoids are similar to a single solenoid except pressure is only
applied when a signal is received. When a signal is not sent to either end,
pressure is applied to neither end, and the [cylinder](pneumatic-cylinder)
holds its position.


## Current Product Info

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### Suppliers

  * [Festo](http://www.festo.com "http://www.festo.com" )
  * [SMC](http://www.smcusa.com "http://www.smcusa.com" )
  * [Bosch-Rexroth](http://www.boschrexroth-us.com/ "http://www.boschrexroth-us.com/" )


### Model Numbers

  * Festo 
    * VPLE18-M5H-4/2-1/4 
  * SMC 
    * SY3240 
    * NVF3130 
  * Bosch-Roxroth 
    * P-026641-00004