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15.2
Back Pressure Valve
The Pulsafeeder diaphragm backpressure valve creates constant backpressure. A PTFE
diaphragm, offering maximum chemical protection and service life, seals the spring and bonnet
from process fluid. This diaphragm seals directly on a replaceable seat. Be sure to install with
fluid flow in direction of arrow on valve body. If arrow is missing from plastic valve body, install
with flow exiting out center hole of valve body.
15.3
Pressure Relief Valve
Pressure relief valves should be utilized in any system to protect the pump and other process
equipment and piping from potentially damaging or unsafe pressures. It is critical that the
pressure relief valve be mounted in the discharge piping system before any other devices that
can potentially block or impede flow, or it cannot perform its intended function. The pressure
relief valve must be set to a pressure high enough to prevent unwanted fluid relief during
normal process conditions. A setting that is approximately 10-20% above normal operating
pressures is generally enough. The valve must also be set below the maximum pressure
capability of the lowest rated device in the system. For example, if a PulsaPro pump is rated
with a maximum pressure capability of 150 psi (approx. 10bar) but the piping within the system
is rated only to a maximum of 100 psi (approx. 7 bar) then the pressure relief valve must be set
to a value lower than 100 psi.
