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.
Alfa Laval is a leading global supplier of products and solutions within the key technology areas of heat transfer, separation, and fluid handling.
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.
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 Parts | 316L |
| Other Steel Parts | 304 |
| Lower Diaphragm | PTFE covered EPDM rubber (standard) Solid PTFE |
| Upper Diaphragm | Nitrile (NBR) standard PTFE covered EPDM rubber Solid PTFE |
| O-ring | Buna (standard) Fluorinated rubber (FPM) covered EPDM rubber |
| Finish | 32 Ra |
TECHNICAL DATA
| Max Product Pressure | 145 psi |
| Min Product Pressure | 0 psi |
| Max Product Viscosity | 500 cps |
| Temperature Range | 14 – 203°F |
| Temperature Range with PTFE/EPDM Upper Diaphragm | 14 – 286°F (higher on request) |
| Air Pressure | 0 – 116 psi |
| Air Connections | R ¼ inch (BSP), internal thread |
Pressure Drop/Capacity Diagrams
Dimensional Data
| Cv 27 | Cv 8 | Cv 2/18 | |
| A1 (in) | 7.96 | 7.96 | 7.96 |
| A2 (in) | 8.80 | 8.80 | 8.80 |
| OD (in) | 2.31 | 2.31 | 2.31 |
| ID (in) | 2.16 | 2.16 | 2.16 |
| t (in) | 0.073 | 0.073 | 0.073 |
| E (in) | 2.23 | 2.23 | 2.23 |
| F (in) | 0.83 | 0.83 | 0.83 |
| G (in) | 5.01 | 5.01 | 5.01 |
| H (in) | 9.24 | 9.24 | 9.24 |
| Tri-Clamp (in) | 0.96 | 0.96 | 0.96 |
| Seat Diameter (in) | 1.91 | 1.41 | 1.41 |
| Weight (lb) | 13.99 | 13.99 | 13.99 |
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 LavalSpare Parts
- Service Kits
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Kv23 Kv2/15 9611920218 - CPMI-2 Spare Parts
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Part Kv23 Kv2/15 Diagram Key Top Handle 9611992958 9611992958 1 Washer 9611992559 9611992559 2 Top 3135600034 3135600034 3 Washer 9611990786 9611990786 4 Screw 9611991222 9611991222 5a Clamp Handle 9612337001 9612337001 5b Clamp 9612335201 9612335201 6 Cover 3135600671 3135600671 7 Air Fitting 88139750 88139750 7a O-Ring, NBR 22340649 22340649 8 O-Ring, FPM 9611992253 9611992253 8 Guide 3135600722 3135600722 9 Upper Diaphragm, NBR 3135600142 3135600142 10 Upper Diaphragm, EPDM/PTFE 3135600144 3135600144 10 Upper Diaphragm, PTFE 9612305702 9612305702 10 Inner Ring 3135600631 3135600631 11 Support Sector 3135600621 3135600621 12 Outer Ring 9612305801 9612305801 13 Lower Diaphragm, EPDM/PTFE 9612306601 9612306601 14 Lower Diaphragm, PTFE 9612305701 9612305701 14 Valve Plug 9612305901 9612306101 15 Valve Body, Weld 9612334001 9612334201 16
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