In many types of systems and applications, the flow of the liquid, steam, gas, or other media in the system has to be independently and automatically controlled. These applications, where manual valve control or self-acting valves are not an option require the choice of a solenoid valve.
A solenoid valve provides complete and accurate automatic control of the flow of the media through that point in the system. In selecting a PTFE solenoid valve, the added benefit is that the wetted surface of the valve is resistant to corrosion as well as the elimination of the risk of accumulation of material in the valve.
For use in high purity applications and sanitary and hygienic process requirements, the choice of a PTFE solenoid valve is often the best possible option. These valves are also very lightweight and durable and can stand up to temperature changes, even in the most demanding types of applications.
Each of the options in the PTFE solenoid valve line operates in a similar fashion. These valves are designed to operate either with an internal system for automation, which is known as an internally piloted valve, or when the control is on the outside of the valve, known as externally piloted valves.
Regardless of the location of the control, this is the system that opens or closes the valve. This done through an electromagnetic field that builds up to open the valve, and then when the electromagnetic field is de-energized, the internal spring pushes the valve back into the closed position, shutting off the flow.
In addition to the normally closed (NC) valve described above, there are also normally open (NO) valves. These operate using the same principle but are closed when engaged and open when inactive.
Configurations and Options
There are several different possible configurations for a solenoid valve. These can be standard or customized to meet the needs of a given application. There are also both two and three-way valves, with three-way valves offering a range of different orientations.