| SPC-2 Sanitary Electro-Pneumatic
Modulating Valve |
 |
| SPC-2,
normally open (NO). |
Application
SPC-2 is a sanitary electro-pneumatic modulating 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
For Δp = 100 kPa (1bar).
** Recommended working area
| Note! |
For the diagram the following applies: |
| |
Medium: Water (20°C). |
| |
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 20°C or similar
liquids).
To select the Kv value it is necessary to calculate the Kvq value using
the following formula:
Where:
| Kvq |
= |
Kv value at specific flow and specific
pressure drop. |
| Q |
= |
Flow rate (m3/h). |
| Δp |
= |
Pressure drop over valve (bar). |
Technical data
Valve
| Max. product pressure: |
1000 kPa (10 bar). |
| Min. product pressure: |
Full vacuum. |
| Temperature range: |
-10°C to 140°C (EPDM). |
| Flow range Kv (Δp = 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: |
10°C below ambient temp. or lower. |
| Max. water content: |
7.5 g/kg. |
I/P converter
| Signal range: |
4 - 20 mA (standard). |
| Input resistance: |
200 Ω |
| 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. |
| Ambient temperature: |
-25°C to +70°C. |
Materials
Valves
| Product wetted steel parts: |
Acid-resistant steel, 1.4404 (316L). |
| Other steel parts: |
Stainless steel, 1.4301(304). |
| Product wetted seals: |
EPDM rubber. |
| Finish: |
Semi-bright. |
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) |
|
Size |
38 |
51 |
63.5 |
76.1 |
101.6 mm |
40 |
50 |
65 |
80 |
100 DN |
|
|
mm |
mm |
mm |
mm |
NO |
NC |
DN |
DN |
DN |
DN |
NO |
NC |
| A |
414 |
419 |
444 |
455 |
491 |
509 |
414 |
419 |
444 |
455 |
491 |
509 |
|
E |
55 |
62 |
67 |
84 |
96 |
96 |
55 |
62 |
67 |
84 |
96 |
96 |
| G |
49.5 |
62 |
82 |
87 |
134 |
134 |
49.5 |
62 |
82 |
87 |
134 |
134 |
|
H |
168 |
168 |
168 |
168 |
168 |
280 |
168 |
168 |
168 |
168 |
168 |
280 |
| OD |
37.9 |
50.8 |
63.5 |
76.1 |
101.6 |
101.6 |
41 |
53 |
70 |
85 |
104 |
104 |
|
ID |
34.9 |
47.6 |
60.3 |
72.1 |
97.6 |
97.6 |
38 |
50 |
66 |
81 |
100 |
100 |
| t |
1.5 |
1.6 |
1.6 |
2.0 |
2.0 |
2.0 |
1.5 |
1.5 |
2.0 |
2.0 |
2.0 |
2.0 |
|
M/ISO clamp |
21 |
21 |
21 |
21 |
21 |
21 |
|
|
|
|
|
|
| M/ISO male |
21 |
21 |
21 |
21 |
21 |
21 |
|
|
|
|
|
|
|
M/DIN male |
|
|
|
|
|
|
22 |
23 |
25 |
25 |
30 |
30 |
| M/SMS male |
20 |
20 |
24 |
24 |
35 |
35 |
|
|
|
|
|
|
|
M/BS male |
22 |
22 |
22 |
22 |
27 |
27 |
|
|
|
|
|
|
| Weight (kg) |
7.5 |
8.2 |
14.0 |
15.0 |
18.3 |
27.3 |
7.5 |
8.2 |
14.0 |
15.0 |
18.3 |
27.3 |
| Flow sizes/tube connections |
|
|
|
Tube connections (mm) |
Actuator (type no.) |
|
Kv |
Seat diam.
(mm) |
ISO |
DIN/DN |
NO |
NC |
| 0,5 E |
6 |
38 |
40 |
3277-5 |
3277-5 |
|
1,0 E |
10 |
38 |
40 |
3277-5 |
3277-5 |
| 2 E |
12 |
38 |
40 |
3277-5 |
3277-5 |
|
4 E |
14 |
38 |
40 |
3277-5 |
3277-5 |
| 8 E |
23 |
38 |
40 |
3277-5 |
3277-5 |
|
16 E |
29 |
38 |
40 |
3277-5 |
3277-5 |
| 32 E |
48.5 |
51 |
50 |
3277-5 |
3277-5 |
|
64 L |
51 |
63.5 |
65 |
3277-5 |
3277-5 |
| 75 L |
51 |
76.1 |
80 |
3277-5 |
3277-5 |
|
110 L |
72 |
101.6 |
100 |
3277-5 |
3277 |
Options
- - Male parts or clamp liners in accordance with required standard.
- - Aseptic version based on ARC diaphragm system.
- - 3A approved version (polished).
- - Explosion protection (EEX ia IIc T6) on request.
- - 3A (Sanitary Standard) labelling on request.
- - Lip seal of Nitrile (NBR) or Fluorinated rubber (FPM).
Ordering
Please state the following when ordering:
- - Valve size (Kv or flow and pressure drop).
- - Actuator version, NO or NC.
- - Connections if not welding ends.
- - Other options.
Note!
For further details, see also PD 65036 and instruction IM
70736.
a. SPC-2, normally open (NO).
b. SPC-2, normally closed (NC).
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