Alfa Laval Unique SSV Long Stroke

The Unique Single Seat Long Stroke valve meets the highest demands of your process in terms of hygiene and safety. Built on the well-proven Unique SSV platform it is especially suitable for use with products containing particles and/or suspended solids and also with high-viscosity flows.

Working principle

The valve is a pneumatic seat valve in a hygienic and modular design 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 valve comes in a one or two body configuration. With its module built structure it is designed for flexibility and easy customization through the electronic configurator. 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.

Technical data

Temperature

Temperature range . . . . . . . . . . . . . -10°C to +140°C (EPDM)

Pressure

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

Valve body combinations

Actuator function

– Pneumatic downward movement, spring return.
– Pneumatic upward movement, spring return.
– Pneumatic upward and downward movement (AA).

Physical Data

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: ThinkTop and ThinkTop Basic
C. Product wetted seals in HNBR or FPM
D. TR2 plug (floating PTFE design)
E. Service tool for plug seals
F. 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 are some of the valve models available, though please use the Alfa Laval computer aided selection tool (Anytime configurator) for full access to all models and options.
– Reverse acting valve.
– Manually operated valve.
– Tank Outlet valve.
– Tangential valve.
The actuator comes with a 5 years warranty.

Dimensions (mm)

Please note!
Opening/closing time will be affected 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.

Pressure drop/capacity diagrams

Note!
For the diagrams the following applies:
Medium: Water (20°C)
Measurement: In accordance with VDI 2173
Pressure drop can also be calculated in Anytime configurator.
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.

2.5″ shut-off valve, where Kv = 111 (See table above).
Q = Kv x √∆p
40 = 111 x √∆p

Pressure data for Unique Single Seat Valve Long Stroke