The INVALCO Model CDM is a diaphragm-operated pressure switch for pneumatic or hydraulic control, fitted with one or two snap-acting three-way Micro Valves for on/off output to one or more circuits. Process pressure is applied to the upper diaphragm chamber and drives the stem down against the spring until the drive collar snaps the Micro Valve. For differential service, the lower pressure goes below the diaphragm and the higher pressure above it, limited to 100 psig static on either side. The Micro Valves are isolated from the diaphragm and each other, so different output pressures and media can share one pilot.
Key specifications
Micro Valve: Type 38F1, 3-way, 3/8" FPT, 1/8" orifice; 100 psig maximum working pressure
Materials: Aluminum diaphragm case and case; Micro Valve aluminum body, stainless trim, nitrile inserts and seals; stainless and brass stem and bushing
Differential service: 100 psig maximum static pressure on either side
Size: approx. 7" x 6.5"
How to specify / order
CDM-3801-B1 (one Micro Valve): part no. 80001208
CDM-3801-B2 (two Micro Valves): part no. 80001209
State the required actuating pressure and whether differential service is needed
Bulletin notes: SSIN014 Rev 0.2 does not list a spring range or actuating-pressure range, and the Micro Valve flow line gives no cfm value. The CDM uses a single spring (45002261). Confirm the operating range with the factory before ordering.
Pricing and lead time are quoted per configuration. Send the model code (or your application details), product, flow range, and pressure/temperature to Flow Measurement Services for a quote. Specifications summarized from Smith Meter (INVALCO) bulletin SSIN014 Rev 0.2 (10/18); confirm current data with the factory before ordering.
Smith Meter (formerly FMC Technologies / TechnipFMC Measurement Solutions), now manufactured by Guidant. Flow Measurement Services supplies and services Smith Meter equipment.