Sandwich flow controls are designed to be used with either sub-based or manifold-based compressed air valves.
Or, we might have a single extruded manifold base on which we have mounted the same ten valves.
Each of those ten valves is controlling a double acting air cylinder.
On the machine where we intend to install this valve bank we need to be able to control the speed of each of the actuators. However, no two are to be operated at the same speed, therefore, in order to be able to independently control the speed of each air cylinder, we will need to install flow controls.
What will be easier, installing 20 individual flow controls, one for each cylinder air line, and forty fittings if the flow control is in-line and does not come with instant fittings attached, or to install ten sandwich flow controls, one for each compressed air valve?
Place one sandwich flow control on the base or manifold in the same location that the valve just was.
You would first ensure that the gasket that came with the sandwich flow control is carefully positioned between the flow control and the base.
You would then place the valve on top of the sandwich flow control. The same gasket that originally sealed the valve to the base, will now seal the same valve to the flow control.
The flow control will normally include bolts long enough to travel from the top of the valve, through itself, and into the base. Do not throw out the original shorter bolts, as you may need them should you wish to remove the flow control in future.
One of the problems with in-line flow controls is that they can be installed ackwards, which prevents them from functioning normally. The typical sandwich flow control cannot be installed incorrectly.
The sandwich flow control mimics the action of the valve exhaust flow controls by controlling the outflow of the cylinder air at the air valve.
If the air line from the cylinder back to the valve bank is too long, the cylinder may have already traveled its full stroke before the back pressure created by the sandwich flow control can slow the flow of exhaust air.
If that is the case in your application, consider using in-line flow controls installed nearer to the cylinder, or, install in-port flow controls right in the cylinder ports, the optimal location for almost instant air cylinder speed control.