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DWYER INSTRUMENTS, INC. | dwyer-inst.com270

Flow Switches,

Paddle

FLOW

FLOTECT

VANE OPERATED FLOW SWITCH

Field Adjustable – Dependable Protection Against Flow Variation or Stopping in Pipelines for Fluids, Gases and Flowing Solids

The Series V4 Flotect

Vane Operated Flow Switch is rugged and reliable, ideal

for automatically protecting equipment and pipeline systems against damage from

reduction or loss of ow. Time tested in thousands of pipeline installations and

processing plants around the world this Series is Weatherproof, designed to meet

NEMA 4 and Explosion-proof (listing included in specications). This series can be

used in pipes 1-1/2˝ (38.10 mm) and up.

FEATURES/BENEFITS

• Unique 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

• Leak proof body machined from bar stock

• Electrical assembly can be easily replaced without removing the unit from installation

so that the process does not have to be shut down

• Installs directly and easily into pipeline with a thredolet, tee, or ange (see application

drawings)

• High pressure rating of 1000 psig (69 bar) with the brass body and 2000 psig (138

bar) with the 316 SS body

• Choice of custom vane calibrated for your application, Model V4, or eld adjustable

multilayer vane, Model V4-2-U (see set point chart)

APPLICATIONS

• Protects pumps, motors and other equipment against low or no ow

• Controls sequential operation of pumps

• Automatically starts auxiliary pumps and engines

• Stops liquid cooled engines, machines and processing when coolant ow is

interrupted

• Shuts down burner when air ow through heating coil fails

• Controls dampers according to ow

3-11/32

[84.93]

2-23/32

[69.06]

UL AND CSA TYPE INCLUDES 16 GA LEADS,

6 [152.4] LONG. ATEX VERSION INCLUDES

TERMINAL BLOCK

1-5/8 [41.28]

CLEARANCE FOR

COVER REMOV

[203.20]

6-3/4

[171.45]

4-11/16

[119.06]

[25.40]

EXPLOSION-PROOF HOUSING WITH 3/4˝ [19.05 MM]

FEMALE NPT OR BSPT CONDUIT CONNECTION

SWITCH BODY, SAE 72 BRASS OR 316 ST

AINLESS STEEL

1-1/2˝ [38.10 MM] MALE NPT OR BSPT

PROCESS CONNECTION

MAGNET KEEPER, 430 STAINLESS STEEL

VANE BLOCK, 316 STAINLESS STEEL

FIVE LAYER VANE 316 STAINLESS STEEL

DESIGNED FOR 1-1/2˝ TO 8˝ [38.10 TO 203.20 MM]

PIPES USABLE IN LARGER PIPE SIZES.

SERIES V4 | W. E. ANDERSON

™

BY DWYER

USA: California Proposition 65

WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

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 Certicate No.: KEMA 03 ATEX

2383.

ATEX Standards: EN 60079-

0:2012+A11:2013; EN 60079-1:2014.

IECEx Certied: For Ex db IIB T6 Gb

-20°C≤Tamb≤73°C. -20°C≤Process

Temp≤73°C.

IECEx Certicate 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 10 A @ 125/250 VAC

(V~). CSA models: 5 A @ 125/250 VAC

(V~); 5 A res., 3 A ind. @ 30 VDC

). MV option: 1 A @125 VAC (V~);

1 A res., .5 A ind. @ 30 VDC (V

). MT

option: 5 A @ 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 and IECEx unit: Terminal block.

Conduit Connection: 3/4˝ female NPT

or 19.05 mm standard or M25 with

-BSPT option.

Process Connection: 1-1/2˝ male NPT

or 1-1/2˝ male BSPT or 38.10 mm.

Mounting Orientation: Within 5° of

vertical for proper operation. Units for

horizontal installation (vertical pipe with

up ow) available.

Set Point Adjustment: For universal

vane: ve vane combinations.

Weight: 4 lb 8 oz (1.9 kg).

Agency Approvals: ATEX, CE, CSA,

FM, IECEx, UL**.

**No housing option (-NH) has no approvals.

MODEL CHART

Model Description Connection Type

V4-2-U

V4-SS-2-U

V4-2-U-NH**

V4-SS

V4-NH**

V4-2-U-BSPT

V4-SS-2-U-BSPT

V4-BSPT

V4-SS-BSPT

Brass body, universal vane

316 SS* body, universal vane

Brass body, universal vane, no housing

Brass body, custom vane

316 SS* body, custom vane

Brass body, custom vane, no housing

Brass body, universal vane

316 SS* body, universal vane

Brass body, custom vane

316 SS* body, custom vane

NPT

BSPT

Note: Consult factory for price and availability of ttings for V4 installation.

Thredolets, bushings, and tees are available in a variety of sizes and materials.

Note: For custom vane models, please supply factory with following information:

pipe size, ow direction (horizontal, up), mounting, pressure, temperature, specic

gravity, ow rates (maximum normal, actuation/deactuation†), etc.

*316 SS body with 430 SS magnet keeper.

**No housing option (-NH) has no approvals.

†When both values are supplied, note which is critical.

OPTIONS

To order add sufx: Description

-D

-MV

-MT

-TRI

-TRD

-316

-V

-AT

-IEC

-BSPT

DPDT contacts

Gold plated contacts, options for dry circuits*

High temperature, option rated 400°F (204°C)*

Increasing ow time delay relay option with 2 SPDT contacts,

adjustable from 0-1 to 0-31 minutes*

Decreasing ow time delay relay option with 2 SPDT

contacts, adjustable from 0-1 to 0-31 minutes*

316 SS magnet keeper, option to replace standard 430 SS

Vertical up ow, option for upward ow in vertical pipe

ATEX compliant construction

IECEx certied construction

Female BSPT process connection and M25 conduit

connection

*See electrical rating in specication, no listings or approvals.

Summary of content (2 pages)

PAGE 1
FLOW ® SERIES V4 | W. E. ANDERSON™ BY DWYER FLOTECT® VANE OPERATED FLOW SWITCH Field Adjustable – Dependable Protection Against Flow Variation or Stopping in Pipelines for Fluids, Gases and Flowing Solids 3-11/32 [84.93] 1-5/8 [41.28] CLEARANCE FOR COVER REMOVAL 6-3/4 [171.45] 4-11/16 8 [119.06] [203.20] 1 [25.
PAGE 2
® FLOW SERIES V4 | W. E. ANDERSON™ BY DWYER FLOTECT® VANE OPERATED FLOW SWITCH Field Adjustable – Dependable Protection Against Flow Variation or Stopping in Pipelines for Fluids, Gases and Flowing Solids 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” threaded branch connection in a horizontal run of pipe.