Alfa Laval Unique RV-ST Safety Valve

Unique RV-ST is the third generation of Alfa Laval single seat regulating valves designed to meet the highest process demands of hygiene and safety. Built on a well-proven, platform from an installed base of more than one million valves, it is ideal for high volume, sanitary liquid processing applications where precision control of flow rate or pressure is required.

Working principle

The valve is remote-controlled by a digital electro-pneumatic process controller. It has few and simple moveable parts which results in a very reliable valve.

Technical Data

Temperature

Temperature range: . . . . . . . . . . . . . . . . .+5°C to +95 °C
Max. sterilisation temperature, dry steam: . .140 °C
*DN25 for gas applications is only available for set pressure up to 1.5 bar

Physical Data

Materials

Product wetted parts: . . . . . . . . . . . 1.4404 (316L)
Other steel parts: . . . . . . . . . . . . . . 1.4301 (304)
Seals: . . . . . . . . . . . . . . . . . . . . . . EPDM
External finish: . . . . . . . . . . . . . . . . Ra 1.5-2.5 µm
Internal finish . . . . . . . . . . . . . . . . . Ra 0.8 µm
Connections: . . . . . . . . . . . . . . . . . Liner/nut – male DIN 11851

Option:

Inductive sensor for feedback is available for standard and pneumatic lifting – see instruction manual for detail.

Dimensions:

Dimensions:

Opening and closing characteristics for incompressible fluids (Liquid)

Max. operating pressure (Pover):
10 % of set pressure or 0.1 bar, whichever is the greater.

Closing pressure (Pclose):
Maximum 15% or 0.3 bar below set pressure, whichever is the greater.

Opening and closing characteristics for compressible fluids (Gas)

Max. operating pressure (Pover):
10 % of set pressure or 0.1 bar, whichever is the greater.

Closing pressure (Pclose):
Maximum 15% or 0.3 bar below set pressure, whichever is the greater.

Blow-off performance chart

DN25 set pressure: 0.2 – 12.0 bar for liquids (water 20 °C)

Pressure range [bar]
A = 0.5 – 1.5
B = 1.6 – 2.5
C = 2.6 – 4.5
D = 4.6 – 7.0
E = 7.1 – 12.0

 

 

 

 

 

 

 

DN 25 set pressure: 0.2 – 1.5 bar for gases (air 20 °C)

Pressure range [bar]
A = 0.2 – 1.5

 

 

 

 

 

 

 

 

 

Blow-off performance chart

DN 40 set pressure: 0.2 – 12.0 bar for liquids (water 20 °C)

Pressure range [bar]
A = 0.2 – 1.0
B = 1.1 – 3.0
C = 3.1 – 7.0
D = 7.1 – 12.0

 

 

 

 

 

 

 

DN 40 set pressure: 0.2 – 12.0 bar for gases (air 20 °C)

Pressure range [bar]
A = 0.2 – 1.0
B = 1.1 – 3.0
C = 3.1 – 7.0
D=   7.1 – 12.0

 

 

 

 

 

 

 Blow-off performance chart

DN 50 set pressure: 0.3 – 12.0 bar for liquids (water 20 °C)

Pressure range [bar]
A = 0.3 – 0.9
B = 1.0 – 1.7
C = 1.8 – 2.9
D = 3.0 – 6.0
E = 6.1 – 12.0

 

 

 

 

 

 

DN50 set pressure: 0.3 – 12.0 bar for gases (air 20 °C)

Pressure range [bar]
A = 0.3 – 0.9
B = 1.0 – 1.7
C = 1.8 – 2.9
D = 3.0 – 6.0
E = 6.1 – 12.0

 

 

 

 

 

 

DN65 set pressure: 0.4 – 9.0 bar for liquids (water 20 °C)

Pressure range [bar]
A = 0.4 – 1.5
B = 1.5 – 3.0
C = 3.1 – 7.0
D = 7.1 – 9.0

 

 

 

 

 

 

 

DN65 set pressure: 0.4 – 9.0 bar for gases (air 20 °C)

 

Pressure range [bar]
A = 0.4 – 1.5
B = 1.6 – 3.0
C = 3.1 – 7.0
D = 7.1 – 9.0

 

 

 

 

 

 

DN80 set pressure: 0.3 – 8.0 bar for liquids (water 20 °C)

Pressure range [bar]
A = 0.3 – 0.9
B = 1.0 – 1.9
C = 2.0 – 3.3
D = 3.4 – 4.3
E = 4.4 – 8.0

 

 

 

 

 

 

DN80 set pressure: 0.3 – 8.0 bar for gases (air 20 °C)

Pressure range [bar]
A = 0.3 – 0.9
B = 1.0 – 1.9
C = 2.0 – 3.3
D = 3.4 – 4.3
E = 4.4 – 8.0

 

 

 

 

 

 

DN100 set pressure: 0.3 – 3.2 bar for liquids (water 20 °C)

Pressure range [bar]
A = 0.3 – 1.1
B = 1.2 – 1.8
C = 1.9 – 3.2

 

 

 

 

 

 

 

DN100 set pressure: 0.3 – 3.2 bar for gases (air 20 °C)

Pressure range [bar]
A = 0.3 – 1.1
B = 1.2 – 1.8
C = 1.9 – 3.2