U.L. AND C.S.A. TYPE
INCLUDES 16 GA.
LEADS, 6 [152.4] LONG.
ATEX VERSION
INCLUDES TERMINAL
BLOCK
EXPLOSION-PROOF HOUSING
WITH 3/4 FEMALE NPT
CONDUIT CONNECTION
SWITCH BODY, SAE 72 BRASS
OR 316 STAINLESS STEEL
1-1/2 MALE NPT
PROCESS CONNECTION
MAGNET KEEPER,
430 STAINLESS STEEL
FIVE LAYER VANE,
316 STAINLESS STEEL,
DESIGNED FOR 1-1/2˝ TO 8˝ PIPES.
USABLE IN LARGER PIPE SIZES.
VANE BLOCK,
316 STAINLESS STEEL
3-11/32
[84.93]
2-23/32
[69.06]
1-5/8 [41.28]
CLEARANCE FOR
COVER REMOVAL
8
[203.20]
6-3/4
[171.45]
1
[25.40]
4-11/16
[119.06]
Rugged and reliable the Flotect®V4 flow switch operates automatically to
protect equipment and pipeline systems against damage from reduction or loss of
flow. The V4 is time tested being installed in thousands of pipelines and processing
plants around the world. A unique magnetically actuated switching design gives
superior performance. There are no bellows, springs, or seals to fail. Instead, a freeswinging vane attracts a magnet within the solid metal switch body, actuating a
snap switch by means of a simple lever arm.
FEATURES
• Leak proof body machined from bar stock
• Choice of custom vane calibrated for your application, Model V4, or field
adjustable multilayer vane, Model V4-2-U (see set point chart on page 4)
• Weatherproof, designed to meet NEMA 4
• Explosion-proof (listing included in specifications)
• Installs directly and easily into pipeline with a thredolet, tee, or flange (see
application drawings on page 4)
• Can be used in pipes 1-1/2˝ and up
• Electrical assembly can be easily replaced without removing the unit from
installation so that the process does not have to be shut down
• High pressure rating of 1000 psig (69 bar) with the brass body and 2000 psig (138
bar) with the 316 SS body
APPLICATIONS
• Protects pumps, motors and other equipment against low or no flow
• Controls sequential operation of pumps
• Automatically starts auxiliary pumps and engines
• Stops liquid cooled engines, machines and processing when coolant
flow is interrupted
• Shuts down burner when air flow through heating coil fails
• Controls dampers according to flow
Series
V4
Vane Operated Flow Switch
Specifications - Installation and Operating Instructions
SPECIFICATIONS
Service: Gases or liquids compatible with wetted materials.
Wetted Materials:
Vane: 316 SS
Body: Brass or 316 SS standard.
Magnet Keeper: 430 SS standard, 316 SS optional.
Options: Other materials also available, consult factory
(e.g. PVC, Hastelloy, Nickel, Monel, Titanium).
Temperature Limit: -4 to 275°F (-20 to 135°C) standard, MT high temperature
option 400°F (205°C) [MT option not UL, CSA, ATEX or IECEx] ATEX and IECEx
options, ambient temperature -4 to 163°F (-20 to 73°C); Process temperature -4
to 163°F (-20 to 73°C).
Pressure Limit: Brass body 1000 psig (69 bar), 316 SS body 2000 psig (138
bar), optional 5000 psig (345 bar) available with 316 SS body and SPDT switch
only.
Enclosure Rating: Weatherproof and Explosion-proof. Listed with UL and CSA
for Class I, Groups C and D; Class II, Groups E, F, and G.
ATEX 0518 II 2 G Ex d IIB T6 Gb -20°C≤Tamb≤73°C.
-20°C≤Process Temp≤73°C.
EC-Type Certificate No.: KEMA 03 ATEX 2383.
ATEX Standards: EN60079-0: 2009; EN60079-1: 2007.
IECEx Certified: For Ex d IIB T6 Gb -20°C≤Tamb≤73°C. -20°C≤Process
Temp≤73°C.
IECEx Certificate of Conformity: IECEX DEK 11.0071.
IECEx Standards: IEC 60079-0: 2007; IEC 60079-1: 2007.
Zone I. Also FM approved.
Switch Type: SPDT snap switch standard, DPDT snap switch optional.
Electrical Rating: UL, FM, ATEX and IECEx models 10A @ 125/250 VAC (V~).
CSA models: 5A @ 125/250 VAC (V~); 5A res., 3A ind. @ 30 VDC (V ). MV
option: 1A @125 VAC (V~); 1A res., .5A ind. @ 30 VDC (V ). MT option: 5A @
125/250 VAC (V~). [MT and MV option not UL, CSA, FM, ATEX or IECEx].
Electrical Connections: UL and CSA models: 16 AWG, 6˝ (152 mm) long. ATEX
or IECEx unit: Terminal block.
Conduit Connection: 3/4˝ female NPT.
Process Connection: 1-1/2˝ male NPT.
Mounting Orientation: Within 5° of vertical for proper operation. Units for
horizontal installation (vertical pipe with up flow) available.
Set Point Adjustment: For universal vane: five vane combinations.
Weight: 4 lb 8 oz (1.9 kg).
Notes:
• Check all ratings given in the instructions and on the product to make sure that the
product is suitable for your application. Do not exceed electrical ratings, pressure
ratings, or temperature ratings of the product.
• Disconnect power supply before beginning installation to prevent possible
equipment damage or electrical shock.
MAINTENANCE
Inspect and clean wetted parts at regular intervals. The cover should be in place at
all times to protect the internal components from dirt, dust, and weather, and to
maintain hazardous location ratings. Disconnect device from the supply circuit
before opening to prevent ignition of hazardous atmosphere. Repairs to be
conducted by Dwyer Instruments, Inc. Units in need of repair should be returned to
the factory prepaid.
Bulletin E-71
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1
S
2
SV
TR
P
V
F
T
V
F
2
2.5
3
4
B
1
2
4
T
1
TB
2
3
V4-SS-316-C-F2S1
Brass Body, SPDT Switch
16 SS Body
3
ype 2 Body Style
T
PDT Switch
D
niversal Vane (Omit for a custom vane)
U
30 SS (Standard)
4
Nickel 200
316 SS
316 SS (Standard)
arpenter 20
C
astelloy B
H
astelloy C
H
onel
M
Brass (Standard)
Carpenter 20
CPVC*
astelloy B
H
astelloy C
H
16 SS (Must also use SS construction selection)
3
Monel
ATEX
IECEx
Epoxy Coated Housing
ull Swing Vane
F
low Test Report
F
igh Pressure*, 5000 psi (345 bar) (Only with SS body)
H
inged Vane
H
igh Temperature* (See specifications for rating)
H
old Contact Snap Switch* (See specifications for rating)
G
NACE Heat Treated Body*
Neoprene Boot*
No Electrical Housing*
Socket Weld Connection*
Terminal Block Wire Connections*
Time Delay Relay* (On flow decrease)
Time Delay Relay* (On flow increase)
Vertical Up Flow Applications
Flange Process Connection
2˝
2-1/2˝
3˝
4˝
C
Carbon Steel
S
316 SS
M
Monel
B
Hastelloy B
H
Hastelloy C
1
150#
3
300#
6
600#
9
900#
Bushing Process Connection
2˝
2-1/2˝
4˝
H
Hex
F
Flush
B
Brass
C
Carbon Steel
S
316 SS
4
304 SS
Tee Process Connection
1-1/2˝
Tee with Bushing Process Connection (Both same material)
2˝
3˝
B0
Brass 125 #
B1
Brass 150 #
B2
Brass 250 #
C
Carbon Steel 2000 #(Only with 2˝ and 3˝)
CP
CPVC SCH 80
S
316 SS 150 #
P
PVC SCH 80
Example
Construction
onstruction
C
ptions
O
Magnet Keeper
Material Options
ane Material
V
ptions
O
Body Material
Options
Other
Options
Flange*
Flange Size
Flange Material
Flange Rating
Bushing*
Bushing Size
Bushing Type
Bushing Material
Tee*
Tee Size
Tee with Bushing*
Tee Size
Tee Material
and Type
* Options that do not have ATEX or IECEx.
Attention: Units without the “AT” suffix are not Directive 94/9/EC (ATEX) compliant. These units are not intended for use in potentially
hazardous atmospheres in the EU. These units may be CE marked for other Directives of the EU.
V4V4SS
3
S
S
2
D
U
1
2
3
1
2
3
4
5
1
2
3
4
5
6
7
AT
IEC
EPOXY
F
F
H
H
M
M
NACE
NB
NH
SW
TBC
TRD
TRI
V
C
6
1
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NSTALLATION
F
G
E
C
D
1
2
3
4
5
6
7
8
9
1
0
8
9
1
0
4
6
7
3
S
TANDARD V4
C
ENELEC V4
PROCESS CONNECTION
1-1/2 MALE NPT
3
-11/32
[
84.93]
2-23/32
[69.06]
1
-5/8 [41.28]
C
LEARANCE FOR
C
OVER REMOVAL
1
[
25.40]
A
B
FRONT VIEW DETAIL SIDE VIEW DETAIL
CLAMP
SCREW
LOCKWASHER
CONDUCTOR
I
. Remove packing material from switch body-cap and remove tape from magnet
1
eeper. Adjust vane length if necessary on multi-layer vanes only (see flow
k
ate charts on next page). Install switch in thredolet previously welded to line.
r
In some cases, it may be necessary to install the switch in a flange or tee (see
installation drawings on next page). Note: extreme care must be exercised in
welding the fitting to the line so that it is plumb and level.
DJUSTMENT OF MULTI-LAYER VANE
A
emove only those layers which are too long. Leave the smaller layers to
R
einforce the vane. The longest vane fits 6˝ (150 mm) or larger pipe, the
r
second longest vane fits 4˝ (100mm) pipe, etc. Actuation-Deactuation rates
are shown in the charts on the next page. To remove vane layers, proceed as
follows:
. Remove the two screws and lockwashers holding the layers together. Do
a
ot lose these special corrosion resistant type 316 stainless steel screws and
n
lockwashers.
b. Remove the unwanted layers.
. Resecure the vane with the original two screws and lockwashers.
c
. With a hammer, lightly peen the ends of the screws so that they can't back
d
out.
e. If you lose the screws or lockwashers, don't replace with other parts which
may corrode and break. That will void the warrantee and might cause severe
amage to equipment located downstream of the switch.
d
ote: Custom vane units have been calibrated at factory to meet
N
requirements. Do not change.
2. The arrow on the side of the switch must point in the direction of flow.
3. Wiring: UL and CSA units only: thread connecting wires through conduit and
connect. Wire in accordance with local electrical codes.
Black - Common
Blue - N.O.
Red - N.C.
Note: Double pole, double throw switches have dual black, blue and red
leads. These are connected in the same manner as single pole, double throw
switches, as described above.
ATEX and IECEx Installation Instructions:
Cable Connection
The cable entry device shall be certified in type of explosion protection
flameproof enclosure “d”, suitable for conditions of use and correctly installed.
Cable entry may exceed 70°C. Conductors and cable gland rated ≥90°C shall
be used.
Conduit Connection
An Ex d certified sealing device such as a conduit seal with setting compound
shall be provided immediately to the entrance of the valve housing. Cable
entry may exceed 70°C. Conductors and cable gland rated ≥90°C shall be
used.
Note: The switch is deactivated and contacts are in normal condition when
there is no flow in the line.
4. Make sure conduit or cable are properly sealed. Electrical components must
be kept free of moisture, including condensation, at all times. CAUTION: To
prevent ignition of hazardous atmosphere, disconnect the device from the
supply circuit before opening. Keep assembly tightly closed when in operation.
Note: ATEX and IECEX units only: The temperature class is determined by
the maximum ambient and or process temperature. Units are intended to be
used in ambient of -20°C≤Tamb≤73°C. Units may be used in process
temperatures up to 133°C providing the enclosure and switch body
temperature do not exceed 73°C. The standard Temperature Class is T6
Process Temp ≤73°C.
Standard V4
ATEX/IECEx unit
5. For units supplied with both internal ground and external bonding terminals, the
round screw inside the housing must be used to ground the control. The external
g
onding screw is for supplementary bonding when allowed or required by local
b
ode. When external bonding conductor is required, conductor must be wrapped a
c
minimum of 180° about the external bonding screw. See below.
TERMINAL CONNECTIONS SPDT
V4 in(mm)
Dim
8-3/16 (207.96)
A
6 (152.40)
B
4-11/16 (119.06)
C
1 (25.40)
D
1-5/16 (33.34)
E
7/8 (22.23)
F
11/16 (17.46)
G
Ref #
Standard V4
1
N/A
2
N/A
3
Explosion-proof housing with 3/4˝
V4-2 in(mm)
8 (203.20)
6-3/4 (171.45)
3-15/16 (100.01)
1-3/4 (44.45)
9/16 (14.30)
11/16 (17.63)
1/2 (12.70)
female NPT conduit connection.
4
16 AWG, 6˝ (152 mm) long.
5
Internal
6
Magnet arm and switch assembly.
7
Switch body of SAE 72 Brass or
316 SS.
8
Five layer vane, 316 Stainless
Steel, Designed for 1/2˝ to 8˝
pipes. Usable in larger pipe sizes.
9
Magnet keeper of 430 Stainless
Steel.
10
Vane block of 316 Stainless Steel.
TERMINAL CONNECTIONS DPDT
ATEX/IECEx unit
Cover lock.
External ground.
Explosion-proof housing with 3/4˝
female NPT conduit connection.
Terminal Block
Internal ground.
Magnet arm and switch assembly.
Switch body of SAE 72 Brass or
316 Stainless Steel.
Five layer vane, 316 Stainless
Steel, Designed for 1/2˝ to 8˝ pipes.
Usable in larger pipe sizes.
Magnet keeper of 430 Stainless
Steel.
Vane block of 316 Stainless Steel.
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V4 Universal Vane Flow Charts
Values shown in both charts are nominal. If normal flows exceed actuation rates by less than 10%, custom vanes are recommended.
Figures are based on standard vertical installation in a 1-1/2" thredolet in a horizontal run of pipe.
APPROXIMATE ACTUATION/DEACTUATION FLOW RATES FOR COLD WATER.
VANE
LAYERS
1
1&2
1,2,&3
1,2,3,&4
1,2,3,4,&5
Actuation rates are based on cold water at a specific gravity of 1.0. For fluids of different specific gravity, actuation rates may be approximated by
dividing the rate shown by the square root of the specific gravity.
VANE
LAYERS
1
1&2
1,2,&3
1,2,3,&4
1,2,3,4,&5
Actuation rates are based on air at standard conditions. For gases at other pressures, temperatures, or specific gravities, consult factory for
equivalent flow approximations.
1.5˝ PIPE
7-3
26.67-11.67
1.5˝ PIPE
32-17
15-8
2˝ PIPE
65-32
30-20
23-13
10-6
2˝ PIPE
15-8
56.7-30
7-4
26.7-15
3˝ PIPE
45-22
167-83.3
23-14
86.7-53.3
11-7
41.7-26.7
APPROXIMATE ACTUATION/DEACTUATION FLOW RATES FOR AIR.
3˝ PIPE
210-105
100-50
120-70
60-30
60-48
30-20
UPPER FIGURES IN GPM. LOWER FIGURES IN
8˝ PIPE
375-175
1417-667
230-150
867-567
160-115
600-433
120-90
450-333
80-65
300-250
8˝ PIPE
1550-850
730-400
1100-700
520-330
725-500
340-240
500-400
240-190
310-250
150-120
6˝ PIPE
950-475
450-220
550-375
260-180
375-265
180-130
260-200
120-90
130-100
60-50
6˝ PIPE
210-120
800-450
130-90
500-333
80-60
300-233
60-45
233-167
40-30
152-113
4˝ PIPE
95-40
367-150
50-35
190-132
27-19
102-71.7
17-12
65-45
UPPER FIGURES IN SCFM. LOWER FIGURES IN
4˝ PIPE
400-200
190-90
195-140
90-70
135-100
60-50
65-50
30-20
APPLICATION DRAWINGS FOR FLOTECT®AUTOMATIC FLOW SWITCHES
10˝ PIPE
600-300
2267-1133
450-250
1700-950
300-180
1133-683
230-150
867-567
135-100
517-383
10˝ PIPE
2400-1300
1100-600
1850-1200
870-570
1200-850
570-400
875-700
410-330
650-525
310-250
12˝ PIPE
3450-1900
1600-900
2700-1750
1300-800
1850-1300
870-610
1250-1000
590-470
1000-800
470-380
12˝ PIPE
900-450
3400-1700
650-350
2467-1317
450-275
1700-1033
310-200
1167-750
200-140
750-533
LPS
14˝ PIPE
4700-2600
2200-1200
3400-2200
1600-1000
2600-1800
1200-800
1900-1500
900-710
1600-1250
760-590
LPM
14˝ PIPE
1200-600
4550-2267
900-500
3400-1900
600-350
2267-1317
430-280
1633-1067
290-200
1100-750
16˝ PIPE
1400-800
5300-3033
1200-650
4550-2467
750-450
2750-2083
550-360
2083-1367
360-250
1367-950
16˝ PIPE
6400-3500
3000-1700
4800-3100
2300-1500
3350-2350
1600-1100
2500-2000
1200-900
2200-1750
1040-830
18˝ PIPE
2000-1000
7567-3783
1450-800
5483-3033
1000-600
3783-2267
700-450
2650-1700
460-325
1733-1233
18˝ PIPE
8000-4400
3800-2100
6000-3900
2800-1800
4300-3000
2000-1400
3100-2500
1500-1200
2800-2250
1300-1100
20˝ PIPE
2400-1200
9083-4550
1800-1000
6817-3783
1200-700
4550-2650
850-550
3217-2083
575-400
2183-1517
20˝ PIPE
10000-5500
4700-2600
7400-4800
3500-2300
5300-3700
2500-1700
3900-3100
1800-1500
3550-2850
1700-1300
1-1/2˝ X 1-1/2˝ X 1-1/2˝
Standard Installation
Flange Installation
©Copyright 2014 Dwyer Instruments, Inc.
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Tee Installation
2˝ X 2˝ X 2˝
Tee Installation
Printed in U.S.A. 9/14
2-1/2˝ Thredolet Installation
FR# 82-440629-00 Rev. 5
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