High purity plastic solenoid valves, as well as those for ultra high purity applications, can be found in a range of different types and interior configurations to allow different flow pathways through the valve.
All solenoid valves operate automatically. The valves use the creation of electromagnetic field in the form of a solenoid coil to turn the valves on or off to allow fluid to flow or to be stopped. Using very limited power, these valves are ideal in a wide range of applications. All plastic solenoid valves are either normally open or normally closed. The normal state occurs when there is no electromagnetic field generated. There are also internally piloted solenoid valves which operate on pressure differentials to control the open and shut function of the valve.
Specially designed chemical resistant solenoid valves have the wetted surfaces coated with PTFE or polytetrafluoroethylene, which is trademarked as Teflon. This smooth, frictionless surface resists any type of corrosion, making it deal in high purity applications as well as in clean rooms.
2-Way and 3-Way Valves
As the name implies, the 2-Way solenoid valve allows the media to flow through the valve in two ways. There are one inlet and one outlet port with the type of valve controlling how it operates.
In the 3-Way plastic solenoid valves, there are three ports and two valve seats. These will include a common port and two ports which will be either open or closed, allowing for control of fluid through the system.
Each option and configuration of solenoid valves will have a maximum pressure rating. It is critical to choose valves rated for the maximum pressure through the system. Additionally, the valves are also rated for voltage tolerance as well as media and ambient temperature range.
There are manufacturers of solenoid valves with the ability to custom design valves for specific applications. There are also options available in standard sizes to better suit the demands of a specific system.
