In pt. 1 of our hydraulic solenoids post, we described how they differ from electromechanical solenoids and discussed some basic applications. We also had a follow-up blog post that described the two major functional categories of hydraulic solenoids, on/off and proportional. This post will expand on the different design and manufacturing features of tubes and coils depending on their intended purpose. Check our blog history for information on more technical subjects and feel free to make suggestions for future posts.