A plunger opens or closes the orifice by raising or lowering within a sleeve tube by energising the coil. Solenoid valves consist of a coil, plunger and sleeve assembly. In normally closed valves, a plunger return spring holds the plunger against the orifice and prevents flow. Once the solenoid coil is energised, the resultant magnetic field raises the plunger, enabling flow.
When the solenoid coil is energised in a normally open valve, the plunger seals off the orifice, which in turn prevents flow. In most flow control applications, it is necessary to start or stop the flow in the circuit to control the fluids in the system.
An electronically operated solenoid valve is usually used for this purpose. By being solenoid actuated, solenoid valves can be positioned in remote locations and may be conveniently controlled by simple electrical switches. Solenoid valves are the most frequently used control elements in fluidics. Solenoid valves work by employing the electromagnetic coil to either open or close the valve orifice.
When the coil within the solenoid is energised, the plunger is lifted or lowered to open or close the orifice. This is what in turn controls flow, regulating the movement of gas or liquid.
One of the main advantages of solenoid valves is their versatility. They can be used in an array of industries, for a wide variety of applications and are perfect for a broad range of liquids or gaseous media. They are also an extremely efficient way of controlling flow, as they require very little wiring, expense and effort compared to other valves. It is also very important that the correct voltage is applied to these valves.
At Fluid Controls, we supply a wide range of solenoid valves, including Maxseal solenoid operated valves. Well known for performing immensely well in extreme and hazardous environments, Maxseal solenoid valves have been installed in plants all over the world for many years.
A 2-way, normally closed, solenoid valve has 2 pipe connections, an inlet called the cavity port and an outlet called the body orifice port. When the valve is energized the plunger opens allowing media to flow through the valve in the cavity port and out the body orifice port. Turn off the power. The orifice closes and flow through the valve stops. If you need a custom solenoid valve for your application, Solenoid Solutions will help you every step of way.
We sell direct, provide virtually instant quotes over the phone, have engineers ready to help and will deliver your prototype in 5-Days or sooner! A certain amount of heat is always generated when a solenoid coil is energized.
The standard version of the solenoid valves has relatively low temperature rises. The maximum permissible fluid temperatures are dependent on the particular seal and body materials specified. These figures can be obtained from the technical data. The small volumes and relatively high magnetic forces involved with solenoid valves enable rapid response times to be obtained.
Valves with various response times are available for special applications. The response time is defined as the time between application of the switching signal and completion of mechanical opening or closing. The on period is defined as the time between switching the solenoid current on and off. The total time of the energized and de-energized periods is the cycle period.
Preferred cycle period: 2, 5, 10 or 30 minutes. The coding for the valve operation always consists of a capital letter. The summary at left details the codes of the various valve operations and indicates the appropriate standard circuit symbols. The technical data is valid for viscosities up to the figure quoted.
Higher viscosities are permissible, but in these cases the voltage tolerance range is reduced and the response times are extended. Temperature limits for the fluid medium are always detailed. Various factors, e. The values quoted herein should, therefore, be used only as a general guide. In cases where operation at extremes of the temperature range are involved, you should seek advice from Omega's Engineering Department. Mechanical Flow meters. Flow Measurement in a Return Activated Sludge line.
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