Alfa Laval Unique SSV Single Seat Valve

 

 

Concept
Unique SSV meets the highest demands of your process in terms of hygiene and safety. It is built on a well-proven platform from an installed base of more than one million valves.

 

Working principle
The valve is a pneumatic seat valve in a hygienic and modular design for a wide field of duties, e.g. as a shut-off valve with two (2) or three (3) ports or as a change-over valve with three (3) to five (5) ports. The valve is remote-controlled by means of compressed air. It has few and simple moveable parts which results in a very reliable valve and low maintenance cost.

 

Standard design
The Unique Single Seat Standard valve comes in a one or two body configuration. To ensure a high degree of flexibility the valve seat between the two bodies in the Change-over version is loose. The valve features an optimized life span of the seals through a defined compression design. The actuator is connected to the valve body using a yoke and all components are assembled with clamp rings.

 

 

Temperature
Temperature range . . . . . . . . . . . . . -10ºC to +140ºC (EPDM)

 

Pressure
Max. product pressure . . . . . . . . . . 1000 kPa (10 bar)
Min. product pressure . . . . . . . . . . . Full vacuum
Air pressure . . . . . . . . . . . . . . . . . . 500 to 700 kPa (5 to 7 bar)

 

Actuator function
- Pneumatic downward movement, spring return.
- Pneumatic upward movement, spring return.
- Pneumatic upward and downward movement (A/A).

 

 

Materials
Product wetted steel parts: . . . . . . . . 1.4404 (316L)
Other steel parts . . . . . . . . . . . . . . . 1.4301 (304)
External surface finish . . . . . . . . . . . Semi-bright (blasted)
Internal surface finish . . . . . . . . . . . . Bright (polished), Ra < 0.8 μm
Product wetted seals: . . . . . . . . . . . EPDM
Other seals . . . . . . . . . . . . . . . . . . NBR

 

Options
A. Male parts or clamp liners in accordance with required standard.
B. Control and Indication: IndiTop, ThinkTop or ThinkTop Basic.
C. Product wetted seals in HNBR or FPM.
D. Plug seals HNBR, FPM or TR2 plug (floating PTFE design).
E. External surface finish bright.

 

Note!
For further details, see instruction ESE00202.

Other valves in the same basic design
The Unique SSV valve range includes several purpose built valves.

Below listed are some of the valve models available.
- Reverse acting valve.
- Long stroke valve.
- Manually operated valve.
- TankOutletvalve.
- Two Step valve.
- Tangentialvalve.

The actuator comes with a 5 years warranty

 

 * = only available with replaceable elastomer plug seal.
1) For exact A1 - A4 dimensions, please refer to informations in CAS.

Please note!
Opening/closing time will be effected by the following:
- The air supply (air pressure).
- The length and dimensions of the air hoses.
- Number of valves connected to the same air hose.
- Use of single solenoid valve for serial connected air actuator functions.
- Product pressure.

Air Connections Compressed air:
R 1/8" (BSP), internal thread.

 

Note!
For the diagrams the following applies:
Medium: Water (20°C)
Measurement: In accordance with VDI2173
Pressure drop can also be calculated in CAS.

Pressure drop can also be calculated with the following formula:
Q = Kv x . p
Where
Q = Flow in m3/h.
Kv = m3/h at a pressure drop of 1 bar (see table above).
p = Pressure drop in bar over the valve.
How to calculate the pressure drop for an ISO 2.5" shut-off valve if the flow is 40 m3/h
2.5" shut-off valve, where Kv = 111 (See table above).
Q = Kv x . p
40 = 111 x . p