User Guide

599 Zone Valve Series: Two-Way and Three-Way Technical Instructions
Document No. 155-320P25
February 6, 2006
Siemens Industry, Inc. Page 5
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 can initiate cycling and
can damage the seat and throttling plug because of the restricted opening. Correct sizing
of the control valve for actual expected conditions is considered essential for good
control.
The following variables must be determined:
The medium to be controlled: hot or chilled water.
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 the Application Bulletin entitled Control Valve Selection and Sizing (140-0038) for
further recommendations.
See Tables 2 and 3 for valve capacities.
Mounting and
Installation
Install the valve so that the flow follows the direction of the arrow indicated on the valve
body.
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.
NOTE: It is not recommended to install the valve assembly so that the actuator is
below horizontal or upside down.
Allow sufficient space for servicing the valve and actuator. See Table 4 for valve body
dimensions.
NOTE: Instructions for field mounting an actuator, wiring diagrams, and start-up
are covered in the Technical Instructions for each actuator.
Service Kit
599-00599 AL50 - Zone valve support rings – 10 pack