The MagnaValve has rare earth permanent magnets for normally closed operation and an electromagnet for controlling media flow rates. With power applied, the magnetic field is neutralized and media is allowed to flow through the valve. When no power is applied to the MagnaValve, the permanent magnets stop all flow. If the power is interrupted for any reason, the permanent magnets securely hold the media, thereby virtually eliminating media leakage.

• No moving parts for low-maintenance operation
• Replaces high-maintenance air cylinders and mechanical mechanisms
• Securely holds the media – even in a power failure
• Completely sealed against debris
• Easily retrofitted to older machines
• Works with most ferrous media including cut wire media, cast steel shot and grit, and stainless steel cut wire media

What is an On-Off version of the MagnaValve?

Most MagnaValves are used when the media needs to be regulated at a particular flow rate. The On-Off version is quite simple. It is either On or it is Off. This version of the MagnaValve has a strong permanent magnet that impedes the flow of ferrous media similar to the other styles of MagnaValves. However, this valve is intended to operate fully open when it is ON. There is no throttling or regulation of the media flow.

How would I use this type of valve?

There are two popular applications of the On-Off MagnaValves. The first is for replenishment of the media hopper. The media should be replenished at the same rate the spent media is discharged through the dust collector. This will maintain the most consistent process for either peening or abrasive blast cleaning. Additions of large amounts of media over long time periods will upset the balance of media in the machine and consistency will be sacrificed. For instance, addition of several hundred pounds of new media in an abrasive blasé cleaning machine will make a mojor change the working mix. Product treated after that addition of media will be treated differently and it may not be acceptable.

Another application of the On-Off MagnaValves is the replacement of mechanical valves used to cut off the flow of media to a suction blast nozzle at the end of a cycle. Suction blast nozzles have an air inlet and a media inlet. There are times when the nozzle is aimed downwards for its blasting operation. At the completion of the blast cycle the media may continue to flow out of the nozzle due to the gravitational forces. The result, unfortunately, is to drain the media out of the hopper. What a mess. So, to address this possibility air cylinders and dipper valves have been used to cut off the flow to the nozzle at the end of the cycle, This is ok as long as the electrical solenoid and the air cylinder continue to operate as expected. Failure of the solenoid (or a blown fuse) or failure of the air cylinder due to air leaks or component breakage can lead to a disastrous situation. Replace that mechanical valve with an On-Off MagnaValve and your problems are solved.