Brochure

F-27855-1058
Forta M900Axx-VB SR and
NSR Actuators
Applications
Schneider Electric Spring Return and Non-Spring Return Forta M900AxxVB series
linear actuators mount directly onto ½”…2” VB-7000 series and obsolete VB-9xxx
½”…1¼” 2-Way and 3-Way globe valve bodies. Applications include chilled or hot
water and steam, NEMA 1 or 2 (M900Axx-VB) or NEMA 4 (M900AxW-VB) models.
Field selectable input signals include reverse and direct acting, floating or propor-
tional 0…1 Vdc, 2…10 Vdc or 4…20 mAdc and proportional sequencing input signal
ranges.
Applicable Literature
• Schneider Electric Forta M900 Datasheet, F-27682
• Forta M900 Installation Instructions, F-27683
• AV-821 Installation Instructions, F-27701
• CA-28 Control Valve Sizing, F-13755
Valve and Actuator Selection Procedure
1. Determine the required flow coefficient (Cv/kvs).
Using the required flow and pressure drop for the application, determine the required
flow coefficient (consult CA28, F-13755 if necessary).
2. Determine valve body part number.
Select a 2-Way valve body from section 1.0 VB-7000 Valve Bodies having the
required flow coefficient, size, body pattern, end connection, and temperature/pres-
sure ratings appropriate for the application. Determine the desired loss of power
position of the valve (M900AR-VB Spring retract, M900 AE-VB Spring extend).
3. Select the Forta Actuator and appropriate spring-return action.
Using the required close-off pressure for the application and the appropriate spring-
return action, select a Forta actuator having sufficient close-off pressure on the valve
body selected in step 2. Additional Forta actuator specifications may be found in
Actuators and Linkages.
4. Determine the Assembly Part Number
If a complete factory valve and actuator assembly is required, consult the actua-
tor code of the Forta actuator selected in Step 3. For the complete assembly part
number:
• Change the valve body part number prefix from VB to VU.
• Insert the actuator code in the third field of the part number.
• Confirm the factory assembly is available.
Example
• Valve Body: VB-7253-0-4-4
• Actuator: M900AR-VB
• Complete Assembly: VU-7253-650-4-4
(Note: Not available as a factory assembly, order the valve body and actuator for field
assembly.)
Forta actuators are field configured for the desired control signal type and range plus
the desired action. Consult the appropriate Forta Installation Instructions for further
information.
3. VB-7000 Valve/Actuator
Assemblies
3. VB-7000 Valve/Actuator
Assemblies