Valve Accessories & Controls
The VACPAC Product News
Retrofit Poster Available
Please let us know if you are interested in the poster above.  We can get one out to you.  Please contact send Tammie an email or call her at 205.678.0507.
Split Ranging
What is split ranging?  This is when you are operating two control valves with one input signal.  For example one valve will go from open to close from 4mA to 12 mA, the next valve will open from 12 mA to 20mA.  This is done by how the cam is set on start up.  Take for example a 90 degree actuator to split range it a C1 cam will be used (pictured).  The cam must be set on the 180 degree lobe side first then for the 4mA to 12mA the start position must be at 9 (pictured below) .  Then if you want the valve to start opening at 12mA the cam will be set on 10 .  This can also be done with other cams for example the C3 cam, if you have a 30 degree rotation and need to split range, use the 60 degree lobe side.  If you have any questions please contact us. (205)678-0507
C1 CAm

Training Dates
Upcoming Dates have been released.
May 10th and 11th
August 23rd and 24th
Spots will fill up fast please contact Cheryl via email or call her at (205) 678-0507


Issue: 8  2011

At Valve Accessories & Controls we are VERY excited about 2011.  We have some big news to share with you in this Product News and some technical tips as well.

We look forward to an exciting 2011, we hope to see you in your office as well as we hope to see you in our training classes through out the year in Chelsea, AL.

Thank you for your support!
Valve Accessories & Controls
BIG NEWS!!!!!! 
We are very excited to add Tammie Hughes to our staff in Chelsea, AL.  She will be doing inside sales, warehouse work, and helping with some clerical duties.  She is a mother of two, and the wife of an Army man.  We are very excited to welcome her to the VAC family.  Her email address is listed below, feel free to send her an email
Air Loss

 Recently we had a field installation that rePneumatic Lock UPminded us about something that sometimes gets defined wrong.  The issue is loss of supply air to a positioner. On a spring return actuator application, the springs take over and this is a non issue.  However, on a double acting actuator there are two possible scenarios when dealing with loss of air supply.  The first scenario is when supply air is cut instantly.  When this happens, the double acting actuator stays in place.  The second scenario is when the compressor fails and there is a slow drop in air pressure.  In this scenario the valve will eventually go to the zero point when the line pressure drops below 20 psi.  To prevent movement in the valve package on loss of air supply we would recommend a pneumatic lock up device, this device is placed between the positioner and actuator. (pictured below)  When the air pressure drops below a set pressure the lock up device activates and locks the air in the actuator.  When the pressure in the air supply goes above the set pressure the device will then allow the positioner to modulate the valve as normal.  Please give us a call if you are interested in buying a pneumatic lock up device or need more information on it.V100 with Pneumatic Lock Up 

Thank you for your continued support of our product line.  If you have any questions or would like to get more information. such as product brochures please call us at (205) 678-0507.

You may also visit our website for more information, (clink VAC to be redirected)  Valve Accessories & Controls.


Randy Estes
Valve Accessories & Controls

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