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Alfa Laval SPC-2 Regulating Valve

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Accurate Regulation of your Flow

SPC-2 Regulating Valve

Application
SPC1SPC-2 is a sanitary electro-pneumatic regulating valve for use in stainless steel pipe systems.

Typical applications of SPC-2 are control of pressure, flow, temperature, level in tanks etc.

Working principle
SPC-2 is remote-controlled by an electrical signal and compressed air.
The valve is available with a normally open (NO) actuator as standard but can be supplied with a normally closed (NC) actuator. The actuator can easily be changed from a NO-version to a NC-version or vice versa.

The IP-converter, which is an integrated part of the actuator, converts the electrical signal to a pneumatic signal. This signal conversion is extremely insensitive to pressure shocks.

The pneumatic signal is transmitted to the integrated positioner which operates by means of the force-balance principle, ensuring that the position of the actuator piston is directly proportional to the input signal. Signal range and zero point can be adjusted individually.

The actuator can be used for split-range operation by using a different measuring spring.

Standard Design
The valve consists of valve body, valve plug, lip seal, bonnet and an external actuator. The actuator with the bonnet is fitted to the valve body by means of a clamp.

The actuator has an integrated IP-converter and positioner which offers substantial advantages compared to externally fitted positioners. All the moving parts are enclosed in the actuator and therefore well protected against damage and dirt.

The actuator has few moving parts, and two main actuator sizes cover all valve sizes.

Capacity diagram
SPC2
Note! For the diagram the following applies:
Medium: Water (20C).
Measurement: In accordance with VDI 2173.
 
Pressure drop calculation
The Kv designation is the flow rate in m3/h at a pressure drop of 1 bar when the valve is fully open (water at 20C or similar liquids).
To select the Kv value it is necessary to calculate the Kvq value using the following formula:
SPC3
Where:
Kvq = Kv value at specific flow and specific pressure drop.
Q =Flow rate (m3/h).
p = Pressure drop over valve (bar).

Technical data
Valve
Max. product pressure: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1000 kPa (10 bar).
Min. product pressure: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Full vacuum.
Temperature range: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-10C to 140C (EPDM).
Flow range Kv (p = 1bar): . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.5 to 110 m3/h.
Max. pressure drop: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .500 kPa (5 bar).

Actuator
Air quality
Air connection: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6/4 air tube with air fitting R1/8" (BSP)
Max. pressure: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .600 kPa (6 bar).
Working pressure: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .400 kPa (4 bar).
Max. size of particles: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.01 mm.
Max. oil content: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.08 ppm.
Dew point: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10C below ambient temp. or lower.
Max. water content: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7.5 g/kg.

I/P converter
Signal range: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 - 20 mA (standard).
Input resistance: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .200 
Inductivity/capacitance: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Negligible.

Accuracy
Deviation: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .≤1.5%
Hysteresis: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .≤0.5%.
Sensitivity: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .<0.1%.
Influence of air supply pressure: . . . . . . . . . . . . . . . . . . . . . . . . . . . . .≤0.1% between 1.4 and 6 bar.

Air consumption at steady state condition: . . . . . . . . . . . . . . . . . . . . . .With 0.6 bar signal pressure and supply pressures up to 6
bar ≤100 In/h.

Protection class: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .IP 54.

Ambient temperature: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-25C to +70C.

Materials
Valves
Productwetted steel parts: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Acid-resistant steel, 1.4404 (316L).
Other steel parts: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Stainless steel, 1.4301(304).
Productwetted seals: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .EPDM.

Actuator
Actuator cases: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Aluminium with plastic coating.
Diaphragms: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .NBR with reinforced fabric insert.
Springs: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Stainless steel uncovered/spring steel epoxy resin coated.
Actuator stem: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Polyamide.
Screws, nuts: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Stainless steel, polyamide.
Other parts: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Stainless steel.

Dimensions (mm)
SPC4

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