Applications
•
Primary Pressure Control
•
Overpressure Protection (Monitor)
•
Underpressure Protection
(Standby)
•
Relief Valve
•
Backpressure Control
•
Power Plant Type Applications*
•
When Unique "Bleed to Pressure
System"
BPS
™ feature can be
utilized
•
Any large downstream systems
(city gate stations, inter-system
pressure limiting)
•
Suction control to reciprocating
compressors*
•
Double-stage cut (working moni-
tor regulator*
•
High Gain systems that require
fast stroking speed (power plants,
fertilizer plants)*
Guidelines for Usage
Large Volume Control Valve Actuators:
Control Valves that require large volume
actuators may require Model VB-250
Volume Boosters to ensure adequate
stroking speed. Volume Boosters are
typically required for Becker RPDA and
LPDA Series actuators size 12T or larger
(2200 in
3
)
Bleed to Pressure System:
The HPP-4
Positioner is typically utilized for applica-
tions with a discharge pressures of 350
psig or less in order to ensure adequate
speed of operation. Bleed to pressure
system eliminates atmospheric emis-
sions by keeping discharge gas in the
piping system.
High Gain Systems:
Power plant feeds
and other similar systems require fast
stroking speed in order to satisfy re-
quired “gain” of the system. The VB-250
Volume Boosters are applied based
upon actuator size and required stroking
speed.
CVE Globe Pattern Control Valves:
The
Becker HPP series positioners are com-
patible with the Globe style control valve,
but require a minimum of 2” of actuator
stroke for proper feedback and opera-
tion. This makes it impossible to use
this positioner with most globe valves
smaller than 4” port size.
Compatible Actuators:
•
Becker RPDA Actuators (Rotary Pis-
ton Double-Acting)
•
Becker LPDA Actuators (Linear Pis-
ton Double-Acting)
•
Other manufacturer’s double-acting
piston actuators*
*consult Becker for additional informa-
tion
Retrofit Compatibility:
Optimum performance is achieved by
pairing the HPP-4 with genuine Becker
control valve actuators. Should you al-
ready have existing control valve actuator
(s) in service, the addition of a Model
HPP-4 can improve performance and
eliminate atmospheric bleed emissions if
using the BPS (Bleed to a pressure sys-
tem) feature.
Some Compatible Actuators:
•
Bettis T-Series Piston Actuators
•
Fisher Type 470 Piston Actuators
•
Fisher Type 1061 Piston
HPP-4
3
September 1999
HPP-4 Positioner
Instruction Manual
