Dwyer Series V4 Flotect Vane Operated Flow Switch Instruction Manual
- June 4, 2024
- Dwyer
Table of Contents
Dwyer Series V4 Flotect Vane Operated Flow Switch
Rugged and reliable the Flotect® V4 Vane Operated 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 free-swinging 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
- Weatherproof, designed to meet NEMA 4
- Explosion-proof (listing included in specifications)
- Installs directly and easily into pipeline with a thredolet, tee, or flange
- 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
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.
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 2813 II 2 G Ex db IIB T6 Gb -20°C≤Tamb≤73°C.
-20°C≤Process Temp≤73°C.
EU-Type Certificate No.: KEMA 03 ATEX 2383.
ATEX Standards : EN60079-0: 2012 + A11: 2013; EN60079-1: 2014.
IECEx Certified: For Ex db 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: 2011; IEC 60079-1: 2014.
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 or M25 x 1.5 with -BSPT option.
Process Connection: 1-1/2˝ male NPT or 1-1/2˝ male BSPT.
Mounting Orientation : Within 5° of vertical for proper operation. Units
for horizontal installation (vertical pipe with up flow) available.
Set Point Adjustmen t: For universal vane: five vane combinations.
Weight: 4 lb 8 oz (1.9 kg).
MODEL CHART
INSTALLATION
-
Remove packing material from switch body-cap and remove tape from magnet keeper. Adjust vane length if necessary on multi-layer vanes only (see flow rate charts on next page). Install switch in thredolet previously welded to line. 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.
Adjustment of Multi-layer Vane
Remove only those layers which are too long. Leave the smaller layers to reinforce the vane. The longest vane fits 6˝ (150 mm) or larger pipe, the 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 lock washers holding the layers together. Do not lose these special corrosion resistant type 316 stainless steel screws and lock washers.
- Remove the unwanted layers.
- Resecure the vane with the original two screws and lockwashers.
- If using a product with the 316 SS vane block option, a second pair of screws are included in the package. Resecure the vane with the correct screws per the below:
# of Vanes Used
|
Use Screw Length
---|---
1,2
| 7/16˝ (included in box)
3, 4, 5|
1/2˝ (pre-installed)
* With a hammer, lightly peen the ends of the screws so that they can’t back out.
* If you lose the screws or lock washers, don’t replace with other parts which may corrode and break. That will void the warranty and might cause severe damage to equipment located downstream of the switch. Note: Custom vane units have been calibrated at factory to meet requirements. Do not change.
-
The arrow on the side of the switch must point in the direction of flow.
-
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 ≥95°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 ≥95°C shall be used. Note: The switch is deactivated and contacts are in normal condition when there is no flow in the line. -
Make sure conduit or cable are properly sealed. Electrical components must be kept free of moisture, including condensation, at all times.
-
For units supplied with both internal ground and external bonding terminals, the ground screw inside the housing must be used to ground the control. The external bonding screw is for supplementary bonding when allowed or required by local code. When external bonding conductor is required, conductor must be wrapped a minimum of 180° about the external bonding screw. See below.
- Front view detail
- Side view detail
- Terminal connections SPDT
- Terminal connections DPDT
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.
APPLICATION DRAWINGS FOR FLOTECT® AUTOMATIC FLOW SWITCHES
