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Industrial
Hygienic
Instrumentation

 


UNIQUE RV-ST REGULATING VALVE


IMPLEMENTATION
Unique RV-ST is a 2nd generation product of Alfa Laval single seat regulation valves. It has been designed to address the highest needs of hygienic and safe processes.  It is founded on a body that has achieved more than a million sales, and is ideal for use in high-flow hygienic liquid processes that require precise low rate control or pressure.

OPERATION PRINCIPLE
The valve is controlled by an electric, digital, pneumatic process control unit. It is a reliable valve with few parts that are easy to remove.

STANDARD DESIGN
It has been designed to reflect the reliable performance of years, and offers highly precise product control at standards with its special actuators and cone-shaped valve body that extensively uses stainless steel. It robust and long-lasting plastic body parts eliminate the breaking of metal. Valve body has been connected to the actuator shaft with a union fitting to prevent use of additional fittings, which has allowed complete integration. Product contact gaskets are standard gaskets that are used in the whole Unique series. Fittings at the end of the actuator or cylinder ensures perfect compatibility.


TECHNICAL DATA
Max. Product Pressure ............................... 10 bar (1000 kPa)
Min. Product Pressure ................................ Full Vacuum
Temperature Range .................................... 10°C to +140°C (EPDM)
Air Pressure ................................................ 5 - 7 bar (500 to 700 kPa)

PHYSICAL DATA
Parts that come into
contact with the product .............................. 1.4404 (316L)
External Coating ......................................... Semi-lustrous
Internal Coating .......................................... Lustrous,  Internal part Ra < 0.8 μm
Other Steel Parts ........................................ 1.4301 (304)
Gaskets ....................................................... EPDM
Other Gaskets ............................................. NBR


8692  POSITION GAUGE VISUAL TOP-LEVEL CONTROL
Signal Setting ............................. 0/4 20 mA and 0 to 5 5/10 V
Input Resistance ........................ 0/4 to 20 mA: 180 Ω
                                                     0 to 5/10 V: 19 Ω
Power Consumption ................... < 5 W
Cable Length ............................. 2 x M16 x 1,5 (cable-ø10mm)
Max.  Cable Diameter ................ 1.5 mm2





POSITION GAUGE
Material ....................................................... PPS, stainless steel
Coating......................................................... PC
Gaskets ....................................................... EPDM
Power voltage.............................................. 24 VDC +/- 10%
Operating Temperature ............................... 0 to 55 °C
Fitting Parts ................................................. ø6 mm  or 1/4”
 Protection Class ......................................... IP65 and IP67
Pos. Monitoring Module .............................. Contactless, Non-corrosive
Communication ........................................... Analogue


8694  POSITION GAUGE NON-VISUAL BASIC CONTROL
Signal Setting ............................. 0/4 to 20 mA
Input Resistance ......................... 180 Ω
Power Consumption ................... < 3,5W
Cable Length .............................. 2 x M16 x 1,5 (cable-ø10mm)                                         Max. Cable Diameter .................. 1.5 mm2




Valve Body Combinations



OTHER VALVES WITH THE SAME BASIC DESIGN
-  Hygienic Unique Single Seat Valves
-  Standard Valves
-  Reverse Moving Valves
-  Long Stroke Valve
-  Manual Valves
-  Aseptic Valves

OPTIONS
a. Male or clamp liner at standard dimensions
b.  HNBR or FPM for gaskets coming into contact with the product
c. Sustainable Actuator
d. Polished external surface coating
e.  Optional gaskets HNBR or FPM




PRESSURE DECREASE/CAPACITY DIAGRAMS


Valve Size 1.5”

Valve Size 2”



Valve Size 2.5”

Valve Size 3”



Valve Size 4”


Not:   Applicable rules for these diagrams:
          Average:  Water (20° C/68° F)
          Sizing: Compliant with VDI 2173


Alfa Laval recommends a maximum flow rate of 5 m/s in tubes and valves.





PRESSURE DATA
Table 1 - Shut-off Valves
Max. Pressure Without Leaking in Valve Seat in Bars
A: Air,   P: Product Pressure,   AC: Air Closed,   SC: Spring Closed


Use of Data to Determine Valve Size
After identifying the Kv factor for a specific application, find this factor on the previous page. Choose the curve that is the nearest to 50% impact.

If we use the example above, you can see the (49) Kv factor in the table on the previous page. You can see that a 2” valve intersects with 1 Kv curve. 2½” 1 curve, 3” 3 curve and 4” 3 curve is intersecting. In this example a 2” valve is the accurate choice because 49
Kv intersects nearest to 50% which is the ideal operating point. As an alternative, a 4” valve also appears near 50%.


Vana Boyutlandırma Akış Katsayısı (Kv)
Alttaki formül ve akış katsayısı değerleri uygulamalarınız için en doğru regülasyon vanasını seçmenize yardımcı olacaktır.

Su ve özgül ağırlığı 1.0 olan diğer ürünler için formül:

Kv =      Q     
        √Δ P


Özgül ağırlığı 1.0 dan farklı olan ürünler i.in formül:

Kv =         Q       
        √Δ P/SG
















Example of Kv Calculation:

Find the valve size required for 60 m3/h water.
Internal pressure 3 bars
External pressure 1,5 bar


Solution:
Internal Pressure (A) minus external pressure (B):
∆ P = 3 bar - 1,5 bar  = 1,5 bar


Where:
Q = Flow rate of product per hour (m3 )
SG = Specific Weight of Product
∆ P = Pressure loss inside the valve (bar)
(Internal Pressure – External Pressure)


Air Fittings Pressurized Air:
R 1/8” (BSP) internal gear actuator



ELECTRICAL CONNECTION