Omega Engineering FSW-50 manual Available Drag Disks, Drag Disk Size

Notes

Available Drag Disks

The FSW-50 Series Switches come with three different drag disks. The drag disks are sized as follows:

DRAG DISK	SIZE
#1	.5" dia.
#2	.83" dia.
#3	1.0" dia.

The following table lists flow adjustment limits for various pipe sizes relative to Model No. and drag disk size. The moment arm (see Step 3 of FLOW RANGE) is held constant at the maximum value. Decreasing the moment arm, increases the adjustment range.

Low Flow	Nominal	Pipe	Nominal	High Flow	% Increase
Model	Low Flow	Size	High Flow	Model	of Listed
Number	Cont. Adj.	(Ins.)	Cont. Adj.	Number	Flows via
	Range		Range		Moment
	(GPM)		(GPM)		Arm Adj.
FSW-50 w/drag	* **		* **	FSW-50 w/drag
disk #2	8-13	1	18-28	disk #1	None
Shortest drag				Shortest drag
disk arm.				disk arm.
	3.3-5.3		7.4-11.5
Mid. size				Smallest drag
drag disk	ft/sec		ft/sec	disk
FSW-51 w/drag	15-30	11/2	30-60	FSW-51 w/drag
disk #3	25-50	2	50-105	disk #1	None
Mid. size	40-80	21/2	80-155	Mid. size
drag disk				drag disk
	2.7-5.4		5.4-10.8
arm. Largest				arm. Smallest
drag disk	ft/sec		ft/sec	drag disk
FSW-52 w/drag	40-90	3	90-180	FSW-52 w/drag
disk #3	60-120	31/2	120-240	disk #1	+25%
	75-155	4	155-310
Longest drag	120-245	5	245-480	Longest drag
disk arm.	180-350	6	350-700	disk arm.
Largest	300-600	8	600-1200	Smallest
drag disk	500-950	10	950-1900	drag disk
	2.4-4.0		4.0-8.0
	ft/sec		ft/sec

**Force/Balance spring relaxed. **Force/Balance spring fully extended.

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