Bray Simple Set Max Pressure Independent Control Valve User Guide
- June 12, 2024
- Bray
Table of Contents
COMMERCIAL
Simple Set Max — Application Guide
Trapped Air Extraction In Pressure Independent Valves
Simple Set Max Pressure Independent Control Valve
During the normal operation of hydronic systems, pressure independent valves
may trap air in the pressure balancing part of the valve. If the air is not
removed, one of the effects is a valve that may pulsate with a mild or violent
shaking force. There are simple procedures for removing this trapped air in
the Simple Set Max pressure independent valves.
To vent trapped air, the valve needs to be cycled closed, wait 10-15 seconds,
and then open it. This exhausts air out of the diaphragm chamber and into the
pipe where it can later rise to a high point for extraction. In a building
with several valves, it is most convenient to perform this from a central
building automation control. We recommend sequentially closing one valve at a
time to minimize the disruption to occupants. If the building is not occupied
it is acceptable to cycle all of the valves at once as long as there is a
method in place to keep the system pressure differential to within the valve
differential pressure range.
Piping in Parallel
To achieve flows larger than specified valve capacity, it is recommended to
connect two valves in parallel leading to a common manifold. The valves should
be connected so that they utilize one common control signal in parallel (2-10
VDC) and the two valves will control the flow in an identical pattern. The
resulting flow will be double, controlled by an individual valve. The
alternative of using a split signal will be less stable, result in less
accurate flow and likely feedback signal errors.
Bray Controls Commercial Division
13788 West Road, Suite 200A
Houston, Texas 77041
BCDSales@Bray.com
Phone: 1-888-412-2729
www.braycommercialdivision.com
© 2021 Bray International, Inc.
09/14/22