Double Coil Solenoid Valves
Double Coil Solenoid Valves Supplier
A Double Coil Solenoid Valves is an electrically controlled valve. The valve features a solenoid, which is an electric coil with a movable ferromagnetic core (plunger) in its centre. In the rest position, the plunger closes off a small orifice. An electric current through the coil creates a magnetic field. When the valve is energised, it switches from one position to the other, allowing fluid to flow through the different ports. On the other hand, a Double Coil Solenoid Valveshas five ports and three positions. It can be either normally closed or normally open, and it has a third position that is used for exhaust.M B Enterprise is a leading Double Coil Solenoid Valves Supplier in Kolkata.
You’ve probably run into the phrase “double solenoid safety shut-off valve” from time to time, but what does this mean? What makes a double solenoid valve different than a single valve? Are they required by NFPA86? Join us for answers to these questions, and more!
What is a Double Coil Solenoid Valves?
A Double Coil Solenoid Valves uses a electromagnetic coil to actuate a valve. Safety shut-off valves (SSOVs) are normally closed, and open when energized. Because they are safety valves, they are tested to ensure very fast (< 1 second) closure when power is removed, shutting off the flow of combustible gas.
A double solenoid SSOV allows two SSOVs to share one valve body. Some manufacturers offer this as a modular option, where two (or more) of their single SSOVs may be mated with special hardware. Others offer double valve models which ship as discrete units, like the one pictured above.
No matter what, the main requirement is there are two individual valve assemblies at work, albeit bolted together or housed in the same cast body.
How do Double Coil Solenoid Valves work?
Double Coil Solenoid Valves function identically to single solenoid SSOVs. Each valve in a Double Coil Solenoid Valves has its own coil, spring, shuttle, valve seat, and valve seal. Functionally, there is no difference between using two single solenoid valves in series or one double solenoid valve.
Watch our video explainer for more info on how solenoid valves work!
As an example, consider the diagram below. The yellow color represents fluid passing through the valve. When de-energized, the closing spring exerts pressure on the valve seal, blocking the passage of fluid through the body. The pressure from the incoming gas also pushes on the disc. This pressure helps to boost the strength of the disc seal.