Principals Of Operation; Diaphragm Valve Operation; Single Tank Normal Operation - Pentair THS Series Installation And User Manual

This manual covers installation and operating instructions for the optional diaphragm valve style
face piping kits for use with the THS SERIES
This manual contains critical safety information that must be furnished to the end user. Failure to
read and follow the instructions could result in serious personal injury and/or major property
damage.
Thank you for purchasing the diaphragm valve style face piping kit for your THS SERIES FILTER
VESSEL. They include features such as pneumatically actuated diaphragm valves, semi-automatic
or automatic backwash controller options, and pre-glued construction for ease of assembly.
This manual covers the installation of face piping for both one and two tank filter systems,
as well as installation of the semi-automatic and automatic controllers for the same. This manual
also covers operation of the semi-automatic controller, as well as a trouble-shooting guide to assist
with any problems which may occur during installation and operation. If you should have any
questions pertaining to the filter tank itself, please refer to the separate manual provided for the
tanks.
Please remember to use proper safety equipment and techniques when installing this
filtration system.

1 Principals of Operation

This section will familiarize you with how the face piping kit and valves work in order to
provide a means of backwashing the filter. It will cover how the diaphragm valves operate, the flow
of water in a single tank system in normal filtration and backwash modes, and a dual tank system in
normal filtration and backwash modes. Please note that the diagrams are for reference only,
and may not be representative of the actual face piping kit.

1.1 Diaphragm Valve Operation

During normal operation water enters one side of
the valve and exits the other. A shaft, which is
attached to a diaphragm at one end, and a throttling
cone and seal at the other, prevents water from
flowing out of the sideport. When the valve is
actuated, water is pumped into the top of the valve
from the controller. This water and pressure causes
the diaphragm to collapse onto the sealing surface
of the valve body. This moves the cone portion of
the shaft allowing water to exit out of the sideport,
while sealing off flow from the influent side of the
valve.

1.2 Single Tank Normal Operation

During normal filtration mode, water is
passed through the influent piping and
into the tank. Water is then passed
through the sand, which is what actually
filters the water. It is then passed
through the collection laterals at the
bottom of the tank. It then passes out
of the effluent pipe and continues on
through the rest of the filtration system.
Diaphragm Valve Face Piping Kit Installation Manual
5/31/12
®
FILTER VESSEL.
Pg. 2 of 52
Rev. F