Pulsafeeder Pulsar Shadow - Manual (Page 8)

3
PULSAlarm Leak Detection
The PULSAlarm leak detection reagent head assembly consists of reagent head, leak detection
diaphragm, suction and discharge check valves, vacuum bleed port, and optional pressure switch and
gauge. If your pump is equipped with this option, refer to Appendix I on page 33 for further
information.
A sealed system must be maintained at all times during pump operation, whether leak
detection is required or not. If the proper level of vacuum, between 10 in and 26 in. (250mm to
650mm) Hg, or a sealed pressure system is not present, decreased flow and/or diaphragm
damage will occur. Please note that the factory setpoint for actuation of the vacuum switch is 6
in (152mm) Hg (vacuum) or 5 psig (pressure).
2.2.2 Pump Head/Piston assembly
The pump head/piston assembly is
installed on the eccentric box. This
assembly contains the hydraulic
system consisting of the pump head,
cylinder, piston assembly, and three
hydraulic valves:
PTP (Push-To-Purge)
HPV (Hydraulic Performance Valve)
HBV (Hydraulic Bypass Valve).
The PTP valve is situated at the top
of the pump head and automatically
removes gases from the hydraulic
system during normal operation.
Momentary manual actuation of the
external valve button overrides
automatic operation to validate
priming or to determine diaphragm
integrity.
The HPV automatically maintains the
required hydraulic oil volume by
replacing any oil lost past the piston
or through the PTP valve.
The HBV protects the pump from
over-pressurizing by relieving any
excess pressure in the pump’s
hydraulic system.
Figure 4
HYDRAULIC
PERFORMANCE
VALVE (HPV)