|Unique 7710 Regulating Valve|
|Unique 7710 Regulating Valve |
The Unique 7710 RegulatingValve is an innovative new generation of Tri-Clover® single seat valves that are designed to meet the highest process demands of hygiene and safety. They’re built on a well-proven, platform from an installed base of more than one million valves.
The Unique 7710 is a sanitary air-operated seat valve with a flexible design. It can be configured as a shut-off valve with two or three ports. It’s ideal applications include the dairy, beverage, brewery, food, pharmaceutical, biotechnology and personal care industries.
The valve is remote-controlled by means of compressed air. It has few and simple moveable parts which results in a very reliable valve.
7710 Regulating Valves are designed to deliver years of reliable performance. They feature a broad selection of stainless steel, tapered valve stems and the unique actuators that ensure an outstanding degree of precise product control. Rugged and long-lasting plastic stem bushings eliminate metal-to-metal galling. The stems are threaded to the actuator shaft, eliminating the coupling between the stem and the actuator, thereby ensuring proper alignment. The plug seal is a standard seal from the Unique serie. Bushings at end of the actuator cylinder support stem also ensure perfect alignment. 32Ra finish is standard on the ID.
Other valves in the same basic design
- - Single Seat valve.
- - Reverse acting valve.
- - Long stroke valve.
- - Manually operated valve.
- - Aseptic valve.
Pressure data for Unique 7710 Series valves
|Table 1 - Shut-off valves|
Max. pressure in psi without leakage at the valve seat
|Actuator / Valve body combination and directionof pressure||Airpressure [psi]||Plugposition||Valve size |
|1½" ||2" ||2½" ||3" ||4" |
|A||= Air|| || || |
|P||= Product pressure|| || || |
|AC||= Air closes|| || || |
|SC||= Spring closes|| || || |
Flow Coefficients (Cv)
The following formula and flow coefficient values enable you to select the correct regulating valve for your application.
Formula for water and other products with a specific gravity equal to 1.0:
Formula for products with a specific gravity other than to 1.0:
GPM =Product flow rate in gallons per minute
SG =Specific gravity of product
∆P = Pressure drop across valve in psi
(inlet pressure minus outlet pressure)
Example of Cv Calculation:
Determine the proper size valve for 175 GPM of water.
Inlet pressure of 11 psi
Outlet pressure of 2 psi
Solution:Inlet pressure (A) minus outlet pressure (B):
DP = 11 psi - 2 psi = 9 psi
How to Use Data to Select Valve Size
After the Cv factor for a specific application has been calculated, locate the factor on the following page. Choose the curve closest to the 50% stroke.
Using the above example, refer to the chart on page 3 you will find that the Cv factor (58) is marked on the chart. You will find that a 2" valve crosses 1 Cv curve, 2½" 1 curve, 3" 3 curves and 4" 3 curves. The correct valve size to use is 2" because Cv 58 crosses the curve closest to the optimum operating point 50 %. Alternatively the 4" valve is also close to the 50%.
Pressure drop/capacity diagrams
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|For the diagrams the following applies:|| |
|Medium: Water (68° F/20° C)|
Measurement: In accordance with VDI2173
| || |
|-------- (dotted line) = Cv 58|| |
| ||1.5" ||2" ||2.5" ||3" ||4" |
|Weight (lb) |
|Air Connections Compressed air:|
R 1/8" (BSP) internal thread for actuator. 1/4" (NPT) for positioner
|Max. product pressure (depending on valve specifications):||145 psi (1000 kPa (10 bar)).|
|Min. product pressure:||Full vacuum.|
|Temperature range:||14°F to +284°F (EPDM).|
|Air pressure:||72.5 to 101.5 psi (500 to 700 kPa (5 - 7 bar)).|
|Positioner data:||See manual for positioner|
- - Pneumatic downward movement, spring return.
- - Pneumatic upward movement, spring return.
Valve Body Combinations
|Product wetted steel parts:||AISI 316L (internal Ra < 32 µ inch) |
|Other steel parts:||AISI 304|
|Plug seal:||EPDM (standard)|
|Optional plug seal:||HNBR or FPM|
|Other product wetted seals:||EPDM (standard)|
|Optional product wetted seals:||HNBR or FPM|
- - Weld ends or connection types other than Tri-Clamp.
- - Product wetted seals in HNBR or FPM.
- - Maintainable actuator.
- - External surface finish blasted.
Please state the following when ordering:
- - Size.
- - Connections
- - Valve body combination.
- - Actuator function: NC or NO
- - Cv values.
- - Options.
For further details, see instruction ESE00480ENUS.