CPM Constant Pressure Valves (CPMI / CPMO)
CPM valves are hygienic constant-pressure control valves designed to maintain a stable pressure setpoint using a diaphragm-controlled plug and pneumatic actuation. CPMI valves regulate inlet pressure, while CPMO valves regulate outlet pressure—ideal for protecting sensitive equipment and stabilizing downstream processes.
How it works
- Pneumatic control keeps a pressure setpoint using an air regulator and line pressure gauge.
- A diaphragm-controlled plug reacts to pressure changes and adjusts valve position.
- CPMI (Inlet): opens more when product pressure increases (and vice versa).
- CPMO (Outlet): closes more when product pressure increases (and vice versa).
Typical applications
- After separators and heat exchangers (inlet pressure control)
- As an overflow / back-pressure valve
- Before filling machines (outlet pressure control)
- Hygienic stainless-steel process lines in dairy, food & beverage
Models & Part Numbers (CPM)
Below are standard valve configurations and part numbers (OEM-style reference). Final selection depends on flow, setpoint pressure and system conditions.
CPM - Inch
Connection: Welding ends | Material: 1.4404 (316L) | Bottom diaphragm: EPDM/PTFE | Other seals: NBR
| Model | Denomination | Part No. | Notes |
|---|---|---|---|
| CPMI-2 | CPMI-2-W-51-Kvs 23 EPDM | 6-9612 30 5501 | Inlet pressure control |
| CPMI-2 | CPMI-2-W-51.0-Kvs 7 EPDM | 6-9612 30 5517 | Lower Kvs for finer control |
| CPMI-2 | CPMI-2-W-51-Kvs 2/15 EPDM | 6-9612 30 5503 | Special Kvs range |
| CPMI-D60 | CPMI-D60-W-76.1-Kvs 60 EPDM | 6-31356 6141 1 | Higher capacity inlet control |
| CPMO-2 | CPMO-2-W-51-Kvs 23 EPDM | 6-9612 30 5502 | Outlet pressure control |
| CPMO-2 | CPMO-2-W-51-Kvs 2/15 EPDM | 6-9612 30 5504 | Special Kvs range |
| CPMO-2 | CPMO-2-W-51-Kvs=9 EPDM | 6-9612 30 5518 | Mid Kvs option |
CPM - DIN
Connection: Welding ends | Material: 1.4404 (316L) | Bottom diaphragm: EPDM/PTFE | Other seals: NBR
| Model | Denomination | Part No. | Notes |
|---|---|---|---|
| CPMI-2 | CPMI-2-W-50-Kvs 23 EPDM | 6-9612 30 5505 | Inlet pressure control |
| CPMI-2 | CPMI-2-W-50-Kvs 7 EPDM | 6-9612 30 5519 | Lower Kvs option |
| CPMI-2 | CPMI-2-W-50-Kvs 2/15 EPDM | 6-9612 30 5507 | Special Kvs range |
| CPMO-2 | CPMO-2-W-50-Kvs 23 EPDM | 6-9612 30 5506 | Outlet pressure control |
| CPMO-2 | CPMO-2-W-50-Kvs 2/15 EPDM | 6-9612 30 5508 | Special Kvs range |
| CPMO-2 | CPMO-2-W-50-Kvs=9 EPDM | 6-9612 30 5520 | Mid Kvs option |
Accessories
Common accessories for pneumatic setup and stable regulation.
| Item | Description | Part No. |
|---|---|---|
| Air regulating kit | Range: 0–8 bar | Air regulating kit for CPM | 6-31356 0150 1 |
| Throttle valve | Throttle valve for CPM | 6-31356 0153 1 |
| Booster | Booster 3 for cover with thread | Booster for CPMI-2 D60 | 6-31356 0090 1 |
Selection Checklist
Send the following information to receive the correct valve type (CPMI/CPMO), Kvs option, connection standard and accessory recommendation.
Process data
- Liquid type (product / CIP media)
- Temperature range (process + cleaning)
- Required flow rate and variation range
- Target setpoint pressure and expected pressure fluctuations
- Installation point (after equipment / before filler)
Build & options
- Connection standard: Inch or DIN (welding ends)
- Elastomer / seal preference (based on CIP chemicals & temperature)
- Available compressed air and need for regulator/throttle
- Booster requirement (project dependent)
- Hygienic documentation requirements (if needed)
Need a quick selection?
Share your setpoint pressure, flow, temperature, media type and installation point—our team will recommend the best CPM configuration.
FAQ
What is the difference between CPMI and CPMO?
CPMI controls inlet pressure (often after equipment like separators/heat exchangers). CPMO controls outlet pressure (often before fillers or downstream sensitive sections).
Do I need a pressure transmitter in the product line?
In many hygienic setups, CPM regulation is handled through pneumatic setpoint control and a line pressure gauge—often without a product-line transmitter.
How do I choose the right Kvs?
Kvs depends on flow rate, system pressure losses, and required control sensitivity. Share your flow and pressure data to receive the best recommendation.
Request a Quote & Technical Support
Send your process details to receive a technical proposal and complete item list (valve + recommended accessories).
Lian Giti Namdar - Hygienic CPM Pressure Control
Please share: target pressure, flow rate, temperature, installation point (after equipment / before filler), and connection standard (DIN/Inch).