Alwa-R (V4220) Backflow preventer

The Alwa-R is used as backflow preventer in potable water installations. The backflow preventer with an opening pressure of <=10 mbar stops water from flowing back through the valve. The valve insert is available as spare part and fits into all valve housings with dimensions according to DVGW. Alwa-R valves are available with various pipe connections. Alwa-K-R valves are equipped with larger external threads specially suitable for pipe connections of various plastic pipes. Valves with draining facility allow draining of the system over the valve.

For potable water systems.

Approvals	Alwa-R are DVGW-certified under registration-no. NW-6130AS2113 and low noise according to DIN 4109.
Materials	All parts with contact to the flow made of corrosion resistant red bronze, stainless steel or plastic
Body pattern	Y-pattern
Integrated non-return device	yes
Max. media temperature	90 ^oC
Static pressure	PN16

Additional description

Suitable connections see 'Connections for Alwa-Valves'.

DN size

Port diameter

Port connection type

Kvs value

Type

inch

R1/2

internal threads

5.1

V4220YY015

R3/4

internal threads

10.6

V4220YY020

internal threads

17.1

V4220YY025

R1 1/4

internal threads

V4220YY032

R1 1/2

internal threads

35.1

V4220YY040

internal threads

64.5

V4220YY050

DN size

Port diameter

Port connection type

Kvs value

Type

inch

G3/4

external threads

5.1

V4220XX015

external threads

10.6

V4220XX020

G1 1/4

external threads

17.1

V4220XX025

G1 1/2

external threads

V4220XX032

G1 3/4

external threads

35.1

V4220XX040

G2 3/8

external threads

64.5

V4220XX050

DN size

Port diameter

Port connection type

Kvs value

Type

inch

R1/2+G3/4

internal and external threads

5.1

V4220XY015

R3/4+G1

internal and external threads

10.6

V4220XY020

R1+G1 1/4

internal and external threads

17.1

V4220XY025

R1 1/4+G1 1/2

internal and external threads

V4220XY032

R1 1/2+G1 3/4

internal and external threads

35.1

V4220XY040

R2+G2 3/8

internal and external threads

64.5

V4220XY050

DN size

Port diameter

Port connection type

Kvs value

Type

inch

external threads

5.1

V4220KK015

G1 1/4

external threads

10.6

V4220KK020

G1 1/2

external threads

17.1

V4220KK025

external threads

V4220KK032

G2 1/4

external threads

35.1

V4220KK040

G2 3/4

external threads

64.5

V4220KK050

DN size

Port diameter

Port connection type

Kvs value

Type

inch

—

flanges

5.1

V4220FF015

—

flanges

10.6

V4220FF020

—

flanges

17.1

V4220FF025

—

flanges

V4220FF032

—

flanges

35.1

V4220FF040

—

flanges

64.5

V4220FF050

Description

Additional Product Type

Replacement valve insert for all valve housings to DVGW, for DN15

VS1402B015

Replacement valve insert for all valve housings to DVGW, for DN20

VS1402B020

Replacement valve insert for all valve housings to DVGW, for DN25

VS1402B025

Replacement valve insert for all valve housings to DVGW, for DN32

VS1402B032

Replacement valve insert for all valve housings to DVGW, for DN40

VS1402B040

Replacement valve insert for all valve housings to DVGW, for DN50

VS1402B050

Description

Additional Product Type

Draining valve, for DN15, DN20 and DN25

VA3401A008

Draining valve, for DN32, DN40, DN50, DN65 and DN80

VA3401A010

Insulation shells, for valves DN10 and DN15

VA2510C015

Insulation shells, for valves DN20

VA2510C020

Insulation shells, for valves DN25

VA2510C025

Insulation shells, for valves DN32

VA2510C032

Insulation shells, for valves DN40

VA2510C040

Insulation shells, for valves DN50

VA2510C050

Sampling valve with connection size G1/4 for building valves up to DN25

VA4250A008

Sampling valve with connection size G3/8 for building valves from DN32 to DN80

VA4250A010

Alwa-R (V4220) Backflow preventer

Alwa-R with internal threads

Alwa-R with external threads

Alwa-R with internal thread on inlet and external thread on outlet

Alwa-K-R with external threads for plastic pipe

Alwa-F-R with flanges

Service parts

Accessories