Alfa Laval® CPMI-2 Constant Pressure Modulating Inlet Valve

Alfa Laval Constant Pressure Modulating Inlet (CPMI) valves are sanitary constant-pressure valves for use in stainless steel pipe systems. The CPMI-2 valve maintains a constant pressure in the process line at the inlet side of the valve. Typical applications of this valve are after separators, heat exchangers, and as an overflow valve.

CPMI-2 is authorized to carry the 3-A symbol.

WORKING PRINCIPLE

The CPMI-2 is remotely controlled by means of compressed air. The valve operates without a transmitter in the product line and requires only a pressure regulating valve for the compressed air and a pressure gauge in the product line.

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 opens at increasing product pressure and vice versa.

Alfa-Laval-CPMI-2-reduced-increased-product-pressure
STANDARD DESIGN

The CPMI-2 consists 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 sector—and flexible diaphragms that 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 CPMI-2 meets 3-A standards.

MATERIALS
Product Wetted Steel Parts316L
Other Steel Parts304
Lower DiaphragmPTFE covered EPDM rubber (standard)
Solid PTFE
Upper DiaphragmNitrile (NBR) standard
PTFE covered EPDM rubber
Solid PTFE
O-ringBuna (standard)
Fluorinated rubber (FPM) covered EPDM rubber
Finish32 Ra
TECHNICAL DATA
Max Product Pressure145 psi
Min Product Pressure0 psi
Max Product Viscosity500 cps
Temperature Range14 – 203°F
Temperature Range with PTFE/EPDM Upper Diaphragm14 – 286°F (higher on request)
Air Pressure0 – 116 psi
Air ConnectionsR ¼ inch (BSP), internal thread

Pressure Drop/Capacity Diagrams

Alfa-Laval-CPM-2-Cv-27-pressure-drop
Alfa-Laval-CPMI-2-Cv-8-pressure-drop
Alfa-Laval-CPM-2-Cv-2-18-pressure-drop

Dimensional Data

Cv 27Cv 8Cv 2/18
A1 (in)7.967.967.96
A2 (in)8.808.808.80
OD (in)2.312.312.31
ID (in)2.162.162.16
t (in)0.0730.0730.073
E (in)2.232.232.23
F (in)0.830.830.83
G (in)5.015.015.01
H (in)9.249.249.24
Tri-Clamp (in)0.960.960.96
Seat Diameter (in)1.911.411.41
Weight (lb)13.9913.9913.99
Alfa-Laval-CPMI-2-dimensions

Options

ORDERING OPTIONS
  • Plug size (Cv 23, Cv 8, Cv 10, or Cv 2/18)
  • Diaphragm type if not standard
  • Connections if not welding ends
  • Optional equipment if needed
OPTIONAL EQUIPMENT
  • Male parts or clamp liners in accordance with required standard
  • Pressure gauge 0 – 87 psi, 1½ inch
  • Pressure gauge 0 – 145 psi, 1½ inch
  • Air pressure regulating valve kit, 0 – 116 psi
  • Air throttling valve for adjustment of regulating speed for the CPM-2 valve
  • Booster for product pressure (product pressure = 1.8 x air pressure) exceeding the available air pressure
  • 3-A Sanitary Standard labelling on request

Product Resources

See all resources by Alfa Laval

Spare Parts

CPMI-2 Spare Parts
PartKv23Kv2/15Diagram Key
Top Handle961199295896119929581
Washer961199255996119925592
Top313560003431356000343
Washer961199078696119907864
Screw961199122296119912225a
Clamp Handle961233700196123370015b
Clamp961233520196123352016
Cover313560067131356006717
Air Fitting88139750881397507a
O-Ring, NBR22340649223406498
O-Ring, FPM961199225396119922538
Guide313560072231356007229
Upper Diaphragm, NBR3135600142313560014210
Upper Diaphragm, EPDM/PTFE3135600144313560014410
Upper Diaphragm, PTFE9612305702961230570210
Inner Ring3135600631313560063111
Support Sector3135600621313560062112
Outer Ring9612305801961230580113
Lower Diaphragm, EPDM/PTFE9612306601961230660114
Lower Diaphragm, PTFE9612305701961230570114
Valve Plug9612305901961230610115
Valve Body, Weld9612334001961233420116

CPMI-2 Parts List

Service Kits
Kv23Kv2/15

9611920218

9611920218

CPMI-2 Parts List

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