Alwa-R (V4220) Backflow preventer
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| 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 |
|---|
| mm | inch | | | |
|---|
| 15 | R1/2 | internal threads | 5.1 | V4220YY015  |
| 20 | R3/4 | internal threads | 10.6 | V4220YY020 |
| 25 | R1 | internal threads | 17.1 | V4220YY025 |
| 32 | R1 1/4 | internal threads | 29 | V4220YY032 |
| 40 | R1 1/2 | internal threads | 35.1 | V4220YY040 |
| 50 | R2 | internal threads | 64.5 | V4220YY050 |
| DN size | Port diameter | Port connection type | Kvs value | Type |
|---|
| mm | inch | | | |
|---|
| 15 | G3/4 | external threads | 5.1 | V4220XX015 |
| 20 | G1 | external threads | 10.6 | V4220XX020 |
| 25 | G1 1/4 | external threads | 17.1 | V4220XX025 |
| 32 | G1 1/2 | external threads | 29 | V4220XX032 |
| 40 | G1 3/4 | external threads | 35.1 | V4220XX040 |
| 50 | G2 3/8 | external threads | 64.5 | V4220XX050 |
| DN size | Port diameter | Port connection type | Kvs value | Type |
|---|
| mm | inch | | | |
|---|
| 15 | R1/2+G3/4 | internal and external threads | 5.1 | V4220XY015 |
| 20 | R3/4+G1 | internal and external threads | 10.6 | V4220XY020 |
| 25 | R1+G1 1/4 | internal and external threads | 17.1 | V4220XY025 |
| 32 | R1 1/4+G1 1/2 | internal and external threads | 29 | V4220XY032 |
| 40 | R1 1/2+G1 3/4 | internal and external threads | 35.1 | V4220XY040 |
| 50 | R2+G2 3/8 | internal and external threads | 64.5 | V4220XY050 |
| DN size | Port diameter | Port connection type | Kvs value | Type |
|---|
| mm | inch | | | |
|---|
| 15 | G1 | external threads | 5.1 | V4220KK015 |
| 20 | G1 1/4 | external threads | 10.6 | V4220KK020 |
| 25 | G1 1/2 | external threads | 17.1 | V4220KK025 |
| 32 | G2 | external threads | 29 | V4220KK032 |
| 40 | G2 1/4 | external threads | 35.1 | V4220KK040 |
| 50 | G2 3/4 | external threads | 64.5 | V4220KK050 |
| DN size | Port diameter | Port connection type | Kvs value | Type |
|---|
| mm | inch | | | |
|---|
| 15 | — | flanges | 5.1 | V4220FF015 |
| 20 | — | flanges | 10.6 | V4220FF020 |
| 25 | — | flanges | 17.1 | V4220FF025 |
| 32 | — | flanges | 29 | V4220FF032 |
| 40 | — | flanges | 35.1 | V4220FF040 |
| 50 | — | 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 |
