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Alfa Laval CPM Constant-Pressure Modulating Valve

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Control the Pressure of your System

CPM Constant-Pressure Modulating Valve

Application
CPM1CPMI-2, CPMI-D60 and CPMO-2 are sanitary constant-pressure valves for use in stainless steel pipe systems.

CPMI-2 and CPMI-D60 (Constant-Pressure Modulating Inlet) maintain a constant pressure in the process line at the inlet side of the valve.
Typical applications of CPMI-2 and CPMI-D60 are after separators, heat exchangers etc. and as overflow valves.

CPMO-2 (Constant-Pressure Modulating Outlet) maintains a constant pressure in the process line at the outlet side of the valve. Typical applications of CPMO-2 are before filling/bottling machines etc.

Working principle
CPMI-2, CPM-I-D60 and CPMO-2 are remote-controlled by means of compressed air. The valves operate without a transmitter in the product line and require only a pressure regulating valve for the compressed air and a pressure gauge in the product line (see fig. 3).

A diaphragm/valve plug system reacts immediately to any alteration of the product pressure and changes position so that the preset pressure is maintained.

CPMI-2 and CPM-I-D60 open at increasing product pressure and vice versa. CPMO-2 closes at increasing product pressure and vice versa (see fig. 3).

Standard Design
The CPMI-2 and CPMO-2 consist of a valve body with valve seat, cover, a valve plug with a diaphragm unit and a clamp.

The diaphragm unit consists of a stainless steel disc which is divided into sectors and of flexible diaphragms which are placed on each side of the sectors.

The cover and the valve body are clamped together. The valve body and the seat are welded together.

The CPM-I-D60 consists of upper and lower valve bodies, an inlet tube, a cover, a valve plug with diaphragm unit and clamps.

The diaphragm unit consists of two flexible diaphragms supported by 12 stainless steel sectors in between them.

The cover and the valve bodies are clamped together.
CPM2
Pressure drop/capacity diagrams
CPM-2, Kv 23
CPM3
Example 1:
Pressure drop p = 200 kPa.
Flow Q = 8 m3/h.
Select: CPM-2, Kv 23 which at working point will be 48% open.

Example 2:
CPMI-2:
Pressure drop p = 300 kPa.
Flow Q = 1 m3/h.
Select: CPMI-2, Kv 2/15 which at working point will be approx. 35% open equal to about 50% of the regulating area.

Example of using the diagram:
1. Pressure drop p = 300 kPa.
2. Flow = 50m3/h.
The intersection is on the 50% curve.

Note!
Always try to get as close as possible to the 50% open curve. If the
CPM-I-D60 is too big select from the CPMI-2 curves.

Technical data
Max. product pressure: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1000 kPa (10 bar).
Min. product pressure: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0 kPa (0 bar).
Temperature range: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-10C to 95C (EPDM).
Temperature range with upper diaphragmin PTFE/EPDM: . . . . . . . . . . .-10 C to +140 C. (Higher on request).
Air pressure (CPMI-2/CPMO-2): . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0 to 800 kPa (0 to 8 bar).
Air pressure (CPM-I-D60): . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0 to 600 kPa (0 to 6 bar).
Flow Kv 23, fully open (Dp = 1 bar): . . . . . . . . . . . . . . . . . . . . . . . . . .Approx 23 m3/h.
Flow Kv 7 (p = 1 bar): . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Approx 7 m3/h.
Flow Kv 9 (p = 1 bar): . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Approx 9 m3/h.
Flow Kv2/15, low capacity (p = 1 bar): . . . . . . . . . . . . . . . . . . . . . . . .Approx 2 m3/h.
(Alternative size) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .(regulating area). Approx. 15 m3/h. (CIP area).
Flow range Kv60, fully open (p = 1 bar) (CPM-I-D60) . . . . . . . . . . . . . .Approx 60 m3/h.

Materials
Productwetted steel parts: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Acid-resistant steel, 1.4404 (316L).
Other steel parts: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Stainless steel, 1.4301(304).
Lower diaphragm: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .PTFE covered EPDM rubber
Upper diaphragm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .NBR

Air Connections
R 1/4" (BSP), internal thread.

Dimensions (mm)
CPM3
Options
A. Male parts or clamp liners in accordance with required standard.
B. Air pressure regulating valve kit, 0-8 bar.
C. Air throttling valve for adjustment of regulating speed for the CPM-2 valve.
D. Booster for product pressure exceeding the available air pressure. (Product pressure = 1.8 x air pressure).
E. US 3A version available on request for CPM-2 valves only

Material grades CPM-2
F. Upper diaphragm of PTFE covered EPDM and O-ring of FPM covered EPDM, (for temperature 95-140C).
G. Both diaphragms of solid PTFE and O-ring of FPM (for temperatures above 140C).

Material grades CPM-I-D60
H. Upper diaphragm of PTFE covered EPDM.
I. Valve body seal rings of NBR or FPM.
J. Guide O-ring of FPM (for temperatures above 95C).

Ordering
CPM-2
Please state the following when ordering:
- Valve type. (CPMI-2 or CPMO-2).
- Plug size (Kv 23, Kv 7, Kv 9 or Kv 2/15).
- Diaphragm type if not standard.
- Connections if not welding ends.
- Options
 
CPM-I-D60
Please state the following when ordering:
- Valve type CPM-I-D60.
- Diaphragm type if not standard.
- Connections if not welding ends.
- Air pressure regulating valve if required.
- Other options.
Note!
For further details, see also instructions IM 70775 and IM70779
CPM4
Fig. 3. CPMI-2 with pressure regulating valve and pressure gauge.
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