Pulsafeeder Pre-Engineered Skid Systems - Manual (Page 15)

Pre-Engineered Skid Systems
Installation, Operation and Maintenance Manual
PES00039, Rev. B System Components and Settings Page 15
Setting Valves and Pulsation Dampener
If furnished with your Pulsafeeder Pre-Engineered Skid System, the Pressure Relief Valve, Back
Pressure Valve and Pulsation Dampener will be pre-set at the factory in accordance with Table 1
located in the Appendix of this manual. These pressure settings are related to the piping and
components furnished with your skid as well as the pump(s) if furnished with the skid. Your system
requirements may require changes to these settings, and the valves will have to be re-set after
maintenance such as diaphragm replacement. A general description and the setting procedures for
these components are as follows:
Pressure Relief Valve (PRV)
A Pressure Relief Valve must always be used with a chemical
metering system that uses a positive displacement pump. This
device is designed to protect the pump and system from over-
pressurization, and it must be set to relieve at the maximum
allowable pressure for the weakest point in the total system.
This may be in your piping on the discharge side of the skid.
It is extremely important that you determine this pressure
limitation and set the PRV accordingly.
Most Pulsafeeder skid systems include a Pressure Relief Valve
(PRV) and suction header where the PRV is directly connected
from the discharge header to the suction header. If your skid
system does not include a suction header, or if you are
providing your own PRV, relief flow from the pressure relief
port on the PRV must be directed to either the suction source or
a separate receptacle. This is usually done with tubing.
Back Pressure Valve (BPV)
The Back Pressure Valve enables the pump to work against a constant pressure and will also function
as an anti-siphon valve. This is especially important for injection systems that operate at low pressures
or where there may be fluctuations in injector system pressure. The BPV is typically set at 50 PSIG,
but a lower set pressure may be required depending upon your pump and your system configuration.
Refer to Table 1 in the Appendix of this manual for recommended pressure settings.
Pressure
Relief Valve
Suction
Header
Discharge
Header
Pressure
Gauge
Figure 12
Skid Component Locations
Skid Discharge
Valve
Back Pressure
Valve
Pulsation
Dampener