Hayward Flow Control
www.haywardflowcontrol.com
1-888-429-4635
PBVRPVIOM Rev A 9/2015
Page 7 of 20
INTRODUCTION
Description:
Back Pressure Valve
The Hayward Series PBV, diaphragm back pressure valve, is used to
enhance the performance of chemical feed pumps and systems by
providing a constant discharge head pressure. These valves also function
as an anti-siphon valve. The diaphragm is held against the seat by the
internal spring. Back pressure is adjustable from 10 - 150 psi via the
adjustment screw. When the inlet pressure exceeds the preset pressure
the diaphragm lifts off the seat and the chemical flows to the injection point.
After each discharge stroke of the pump, as the pressure drops, the
diaphragm reseats itself.
Pressure Relief Valve
Hayward Series RPV, diaphragm pressure relief valve, is designed to
protect chemical feed pumps and systems from overpressure caused by
defective equipment or blockages in the chemical line. The 3 port design
allows chemical to flow through the valve via an internal chamber. When
the pressure in the chemical line exceeds the preset pressure of the valve
the diaphragm lifts off the seat and the chemical then flows out the bottom
port back to the chemical tank. Relief pressure is adjustable via the
adjustment screw in the top of the valve.
