Data Sheet for Product

Technical Instructions Flowrite VF599 Series Three-Way Valves
Document Number 155-160P25 2-1/2 to 6-inch Flanged Iron Body
June 14, 2019
Page 8 Siemens Industry, Inc.
Sizing
The sizing of a valve is important for correct system operation. An undersized valve
will not have sufficient capacity at maximum load. An oversized valve may initiate
cycling and the seat and throttling plug can be damaged because of the restricted
opening. Correct sizing of the control valve for actual expected conditions is
considered essential for good control.
Some variables which must be determined are:
• The medium to be controlled: water, etc.
• The maximum inlet temperature and pressure of the medium at the valve.
• The pressure differential that will exist across the valve under maximum load
demand.
• The maximum capacity the valve must deliver.
• The maximum line pressure differential the valve actuator must close against.
• See AB-1 Control Valve Selection and Sizing (155-285) for further
recommendations.
See Table 6 and Table 7 for valve capacities.
Mounting and
Installation
• Install the valve so that the flow follows the direction of the arrow indicated on the
valve body identification tag.
• For best performance, install the valve assembly with the actuator above the valve
body. The valve and actuator can be installed in any position between vertical and
horizontal. Siemens Building Technologies does not recommend installing the valve
assembly below horizontal or upside down.
• If installing a service flange, see Table 13 for proper placement.
• For flange dimensions and bolt hole information, see Cast Iron Flange Dimensions
for 2-1/2 through 6-inch Valves Technical Bulletin (140-0038 [TB 248]. Allow
sufficient space for servicing the valve and actuator. See Table 12 for valve body
dimensions. See Table 11 and Figure 5 for dimensions of the service envelope
recommended around the actuator.
• A lower seat tool is required for removing a three-way valve. See Table 10 for part
numbers.
NOTE: Instructions for field mounting an actuator, spring adjustments, wiring
diagrams, and start-up are covered in the Technical Instructions and
Installation Instructions for each actuator.
Table 10. Three-Way Valve Lower Seat Tool.
Part Number
Valve Size
Inches (mm)
599-09144
2-1/2 (65)
599-09145
3 (75)
599-09146
4 (100)
599-09147
5 (125)
599-09148
6 (150)