VFR

Flow adjustment damper, variant VFR, with actuator (mechanical stops)

Tested to VDI 6022

Actuator with potentiometers

Actuator with mechanical stops

Variant with rotary knob

VFR

FOR THE RELIABLE BALANCING OF VOLUME FLOW RATES

Circular flow adjustment dampers for the adjustment of volume flow rates and pressures in supply air and extract air systems

Each flow adjustment damper carries a diagram with setting values that ensure rapid commissioning on site
Suitable for duct pressures up to 1000 Pa.
Volume flow rate can be set using a rotary knob and a scale on the outside of the casing
Simple retrofit of an actuator
Casing air leakage to EN 1751, class C

Optional equipment and accessories

Actuator with potentiometer
Actuator with mechanical stops

Initialize order code

Application

Application

Circular flow adjustment dampers Type VFR for the simple balancing of volume flow rates and pressures in air conditioning systems
Stepless adjustment of the volume flow rate using a rotary knob with position indicator
Simple retrofit of an actuator
At the minimum setting (closed position 0) a system pressure dependent leakage flow rate occurs

Special features

Diagram with setting values on each flow adjustment damper
Simple retrofit of an actuator is possible

Nominal sizes

80, 100, 125, 140, 150, 160, 180 , 200, 224, 250

Description

Construction

Galvanised sheet steel
A2: Stainless steel

Parts and characteristics

Ready-to-install flow adjustment damper
Rotary knob with position indicator
Stepless adjustment from 0 to 10
Diagram with setting values
Lip seal

Attachments

Min/Max actuators: Actuators for switching between minimum and maximum volume flow rate setpoint values
Modulating actuators: Actuators for the stepless adjustment of volume flow rates

Construction features

Spigot with lip seal, for circular connecting ducts to EN 1506 or EN 13180
Very good dimensional stability due to double grooves
Damper blade without seal but with perimeter gap of 3 mm

Materials and surfaces

Rotary knob, damper blade and bearings made of plastic, flame retardant (V-0) to UL 94

Galvanised sheet steel construction

Casing made of galvanised sheet steel

Stainless steel construction (A2)

Casing made of stainless steel 1.4301

Standards and guidelines

Hygiene conforms to VDI 6022
Casing air leakage to EN 1751, class C

Maintenance

Maintenance-free as construction and materials are not subject to wear

Technical information

Function, Technical data, QUICK SIZING, Specification text, Order code, Product relations

Schematic illustration of the VFR 00135860_0

① Damper blade
② Scale
③ Rotary knob
④ Rotary knob locking screw
⑤ Lip seal
⑥ Diagram with setting values

Functional description

For balancing the volume flow rates of duct sections and air terminal devices the differential pressure must be set on the flow adjustment dampers. The value to be set for a certain required volume flow rate at a given differential pressure can be taken from the diagram that each flow adjustment damper carries. This value can then be set using the rotary knob with the position indicator (stepless adjustment between 0 and 10).

Nominal sizes	80 – 250 mm
Volume flow rate range	20 – 485 l/s or 72 – 1746 m³/h
Minimum differential pressure	20 Pa
Maximum differential pressure	1000 Pa
Operating temperature	10 – 50 °C

Closed blade air leakage

Nominal size	Δp_st [Pa]
Nominal size	100		200		500
Nominal size	l/s	m³/h	l/s	m³/h	l/s	m³/h
80	9	32	13	46	20	72
100	13	45	18	64	28	101
125	16	58	23	82	36	130
140	17	61	25	89	39	140
150	18	66	26	93	41	148
160	21	76	30	107	47	169
180	19	69	27	98	43	155
200	21	74	29	105	46	166
224	22	80	32	114	50	180
250	25	89	35	125	55	198

Quick sizing tables provide a good overview of the room sound pressure levels that can be expected. Approximate intermediate values can be interpolated.

Quick sizing: Sound pressure level

Nominal size	Volume flow rate		Δp_st [Pa]
Nominal size	Volume flow rate		10	20	30	50	80	100	200
Nominal size	Volume flow rate		L_PA
Nominal size	l/s	m³/h	dB(A)
80	20	72	25	28	30	32	35	36	41
80	30	108	30	33	35	37	40	41	45
80	40	144	33	36	38	41	43	45	49
80	50	180	36	40	42	44	47	48	53
100	30	109	27	29	31	34	36	38	44
100	45	163	32	35	37	39	42	43	48
100	60	217	36	39	41	44	46	48	52
100	75	272	40	43	45	48	50	52	56
125	50	180	28	31	33	36	39	41	47
125	70	252	33	36	38	41	44	46	51
125	95	342	37	41	43	46	49	50	55
125	120	432	41	45	47	50	53	54	59
140	60	215	25	29	31	34	38	40	47
140	90	323	31	34	37	40	44	45	51
140	120	431	35	39	42	45	48	50	56
140	150	538	39	43	45	49	52	54	59
150	70	252	26	30	32	36	39	41	48
150	105	378	31	35	37	41	44	46	52
150	140	504	35	39	42	45	48	50	56
150	170	612	37	42	44	48	51	53	58
160	80	288	27	30	33	36	39	41	48
160	120	432	33	37	39	42	45	47	53
160	155	558	38	41	44	47	50	51	57
160	195	702	41	45	47	50	53	54	59
180	100	358	25	29	32	35	39	41	48
180	150	540	31	35	38	41	45	47	53
180	200	720	35	39	42	45	48	50	56
180	250	900	38	42	45	48	51	53	59
200	125	450	26	30	33	37	41	43	51
200	185	665	32	36	39	42	46	48	55
200	245	882	36	40	43	47	50	52	59
200	310	1116	39	44	46	50	54	56	62
224	155	557	24	28	31	35	39	41	47
224	230	828	28	32	35	39	42	44	50
224	310	1115	32	36	38	42	45	47	53
224	385	1386	34	38	41	44	48	49	55
250	195	702	24	28	32	36	41	43	52
250	290	1043	28	33	36	40	45	47	56
250	385	1386	31	36	40	44	49	51	59
250	485	1746	34	39	43	47	52	54	62

Circular flow adjustment dampers for the simple balancing of volume flow rates in air conditioning systems, for supply air and extract air, available in 10 nominal sizes.

Suitable for duct pressures up to 1000 Pa.

Ready-to-install unit consists of the casing with damper blade and rotary knob for the stepless adjustment of volume flow rates.

Spigot with lip seal, for circular connecting ducts to EN 1506 or EN 13180.

Casing air leakage to EN 1751, class C.

Special features

Diagram with setting values on each flow adjustment damper
Simple retrofit of an actuator is possible

Materials and surfaces

Rotary knob, damper blade and bearings made of plastic, flame retardant (V-0) to UL 94

Galvanised sheet steel construction

Casing made of galvanised sheet steel

Stainless steel construction (A2)

Casing made of stainless steel 1.4301

Construction

Galvanised sheet steel
A2: Stainless steel

Technical data

Nominal sizes: 80 to 250 mm
Volume flow rate range: 9 to 615 l/s or 32 to 2215 m³/h
Minimum differential pressure: 20 Pa
Maximum differential pressure: 1000 Pa

Sizing data

V _______________________ [m³/h]
Δp_st _______________________ [Pa]

Air-regenerated noise

L_PA _______________________ [dB(A)]

This specification text describes the general properties of the product. Texts for variants can be generated with our Easy Product Finder design programme.

Type
VFR Flow adjustment damper

Material
No entry: galvanised sheet steel
A2 Stainless steel

Nominal size [mm]
80
100
125
140
150
160
180
200
224
250

Actuator
       No entry: manual operation
       For example
E01       24 V AC/DC, 3-point, potentiometer
E03       24 V AC/DC, modulating, 0 – 10 V DC, potentiometer
M01       24 V AC/DC, 3-point, mechanical stops

Order example: VFR/160/M01

Nominal size	160 mm
Actuator	24 V AC/DC, mechanical stops

Variants, Attachments, Dimensions and weight, Product details

① Flow adjustment damper, variant VFR, with rotary knob

Attachments

Order code detail	Actuator	Supply voltage	Auxiliary switch
Min/Max actuators
E01	Actuator with potentiometers TROX/Gruner	24 V AC/DC	–
E02	Actuator with potentiometers TROX/Gruner	230 V AC	–
M01	Actuator with mechanical stops TROX/Belimo	24 V AC/DC	–
M02	Actuator with mechanical stops TROX/Belimo	230 V AC	–
Modulating actuators
E03	Actuator with potentiometers TROX/Gruner	24 V AC/DC	–

VFR

VFR

Nominal size	VFR m kg	VFR/.../E0* m kg	VFR/.../M0* m kg	ØD mm
80	0.5	0.8	0.7	79
100	0.6	0.9	0.8	99
125	0.7	1.0	0.9	124
140	0.8	1.1	1.0	139
150	0.8	1.1	1.0	149
160	0.8	1.1	1.0	159
180	0.9	1.2	1.1	179
200	1.0	1.3	1.2	199
224	1.2	1.4	1.4	223
250	1.3	1.6	1.5	249

Type VFR – The System 00137021_0

① Flow adjustment damper VFR with rotary knob
② Actuator E0* with potentiometers
③ Actuator M0* with mechanical stops

Installation details, Commissioning, Basic information and nomenclature

Access to attachments, attached on one side 00149821_0

Installation and commissioning

Any installation orientation
Volume flow rate setpoint can be set on external scale

Space required

Attachments	①	②	③
Attachments	mm
Without actuator	200	200	200
With actuator E0*	200	200	300
With actuator M0*	200	200	230

Diagram with setting values 00134305_0

Diagram to determine the setting values on site (example for nominal size 125)

Definition of noise

① Air-regenerated noise
② Case-radiated noise

Principal dimensions

ØD [mm]

Shut-off and flow adjustment dampers made of stainless steel: Outer diameter of the connecting spigot

Shut-off dampers made of plastic: Inside diameter of the connecting spigot

ØD₁ [mm]

Pitch circle diameter of flanges

ØD₂ [mm]

Outer diameter of flanges

ØD₄ [mm]

Inside diameter of the screw holes of flanges

L [mm]

Length of unit including connecting spigot

L₁ [mm]

Length of casing or acoustic cladding

n [ ]

Number of flange screw holes

T [mm]

Flange thickness

m [kg]

Unit weight including the minimum required attachments

Acoustic data

L_PA [dB(A)]

A-weighted sound pressure level of air-regenerated noise of the shut-off or flow adjustment damper, system attenuation taken into account

All sound pressure levels are based on 20 μPa.

Volume flow rates

V [m³/h] and [l/s]

Volume flow rate

Differential pressure

Δp_st [Pa]

Static differential pressure

Downloads

product information

Product data sheet Type VFR

VFR_PD_01_2017_03_DE_en Product data sheet 2,3 MB pdf

certificates

Certificate concerning statistical leakage tests

LC_v2_2024_10_DE_en Certificate 650 KB pdf
Declaration of conformity or declaration of incorporation Type VFR

Declaration of conformity or declaration of incorporation 93 KB pdf
Declaration of hygiene conformity Type VFR

VFR_HC_2024_05_DE_en Hygiene certificate 2 MB pdf

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VFR