Dwyer Instruments SERIES V7 Catalog Page
NORMALLY OPEN
[17.46]
®
SERIES V7 | W. E. ANDERSON™ BY DWYER
FLOTECT® VANE OPERATED FLOW SWITCH
FLOW
Magnetic Linkage, UL Approved
3/4
[19.05]
NORMALLY
1 NPT
11/16
A
The Series V7 Flotect® Vane Flow Switch is an inexpensive range switch for use
with compatible liquids to start or stop electronic operated equipment when ow or noow conditions occur. Design is standard weatherproof, meeting NEMA 4X.
FEATURES/BENEFITS
• Magnetically actuated switching design gives superior performance
• Features a free-swinging vane which attracts a magnet within the solid metal switch
body, actuating a snap switch by means of a simple lever arm with no bellows,
springs, or seals to fail
• Lower body is machined solid metal bar stock assuring no leak points, no matter how
long the unit is in service
• Robust vane design is rigid and eld trimmable for set point adjustment
APPLICATIONS
• Proof of boiler ow
• Shuts down burner when air ow through heating coil fails
• Protects pumps, motors and other equipment against low or no ow
• Stops liquid cooled engines, machines and processing when coolant ow is
interrupted
APPROXIMATE ACTUATION/DEACTUATION FLOW RATES
FOR COLD WATER; GPM (LPM)
Pipe Size Actuate Deactuate
1˝
1-1/4˝
1-1/2˝
2˝
2-1/2˝
3˝
4˝
Note: Contact the factory for different actuation-deactuation rates.
7.5 (28.4)
8.1 (30.8)
11.7 (44.1)
16.9 (64.0)
19.6 (74.2)
31.6 (120)
58.0 (218)
6.8 (25.7)
7.6 (28.9)
10.9 (41.3)
15.6 (59.1)
18.1 (68.5)
29.6 (112)
52.0 (197)
Pipe Size Dim. A Pipe Size Dim. A
1
1-1/4
1-1/2
CLOSED
COMMON
GROUND
1-3/8 [34.93]
1/2 FEMALE
3.702
6-31/32 [177.00]
SPECIFICATIONS
Service: Liquids compatible with wetted
materials that are non-coating and noncrystallizing.
Wetted Materials: Vane: 301 SS;
Process connection: Brass or 316 SS;
Magnet: Ceramic; Other: 301, 302 SS.
Upper Body Material: Die cast
aluminum.
Temperature Limits: -40 to 250°F (-40
to 121°C).
Pressure Limits: 250 psi (17.2 bar).
Enclosure Rating: Weatherproof, meets
NEMA 4X (IP66).
Switch Type: SPDT snap switch.
Electrical Rating: 10 A @ 125, 250,
480 VAC; 1/8 hp @ 125 VAC, 1/4 hp @
250 VAC.
MODEL CHART
Model Body Material
V7-WBS-30N
V7-WSS-30N
USA: California Proposition 65
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
.554
Brass
316 SS
NPSM
1-17/64 [32.15]
1-19/32 [40.48]
1-53/64 [46.43]
Electrical Connections: 3 screw type,
common, normally open and normally
closed.
Conduit Connection: 1/2˝ NPSM.
Process Connection: 1˝ male NPT.
Contact factory for optional tees.
Pipe Size: 1˝ to 4˝.
Mounting Orientation: Horizontal or
vertical (actuation ow rates are based
on horizontal pipe runs in the vertical
position). Will not work in vertical pipe
with down ow.
Set Point Adjustment: Vane is
trimmable, see set point chart.
Weight: 1 lb 2 oz (500 g).
Agency Approvals: CE, UL.
2
3
4
2-11/64 [55.17]
2-11/64 [55.17]
2-11/64 [55.17]
2-37/64
[65.48]
2X 47/64
[18.65]
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