HPP-4 SeriesPneumatic Valve Positioner
HPP-4 pneumatic positioners provide accurate positioning of double-acting actuated control valves
Description: The Becker Model HPP-4 Double-Acting Positioner provides accurate valve
positioning when utilized with a double-acting piston actuated control valve. The HPP-
4 accepts a pneumatic instrument signal and positions the double-acting
actuator
proportionally. The HPP-4 Positioner may be utilized for most valve positioning
applications. HPP-4’s are available in both reverse acting and direct acting
configurations with a variety of different input signal ranges. The HPP-4 is typically
utilized when Bleed to Pressure System (BPS™) may be used to completely eliminate
atmospheric bleed emissions. Additionally, the HPP-4 is typically utilized for high
speed applications and large volume control
actuators that both require VB-250
volume boosters. HPP-4 Applications Pressure Control Flow Control Power Plant Type Pressure Control Power Plant Type Flow Control Surge Control Compatible Actuators RPDA Series (Small Volume Models) RPDA Series (Large Volume Models) RPSR Series LPDA Series (Small Volume Models) LPDA Series (Large Volume Models) LPSR Series
Figure 1.0 - BeckerModel HPP-4 shown LPDA Series Actuators: LD Series
High Gain Systems: HPP-4 Positioners may be utilized with LPDA Series Linear
actuators, but are not capable of accepting an
actuator with
stroke length less than 2”. This excludes usage of CVE Globe
valves of 4” nominal bore or less with HPP-4 Positioner.
Application Guidelines:
Power plant feeds and other similar systems require fast
stroking speed in order to satisfy required “gain” of the system.
For high gain applications, it is recommended that a Model
HPP-4 with Model VB-Series Volume Boosters be utilized. Large Volume Actuators: Large Volume Actuators are defined as
actuators with piston
displacement (volume) greater than 2000 in3 that typically
require high flow volume instrumentation. For
actuators larger
than 2000 in3, it is recommended that a Model HPP-4 with
Model VB-Series Volume Boosters be utilized. Engineered forthe Environment Figure 2.0 – HPP-4 Series Positioner
installed on Becker RPDA Series
Actuator The HPP-4 Series Positioner may be
utilized with any Becker double-acting
series
actuator for accurate positioning
of control valves. The HPP-4 is
designed to accept a pneumatic
instrument signal from an I/P transducer
or a pneumatic controller. The HPP-4 is
available in both reverse and direct
acting with a variety of instrument signal
input ranges. The configuration shown
above shows the HPP-4 mounted on a
Becker RPDA Series
actuator with an
optional NBV-100 to shutoff bleed when
the control valve is at both full-open and
full-closed positions. Additionally, the
HPP-4 is equipped with VB-250 Series
Volume Boosters to provide increased
flow capacity for large control valve
actuators and/or high speed
applications such as power plants. VB-250Volume BoostersSupply Gas System Model HPP-4 Positioner InstrumentSignal NBV
Becker Model RPDAPiston Actuator Control Valve(Ball Valve)Exhaust FLOW Schematic Legend: Instrument Signal Upstream Pressure (P1) Exhaust (Discharge) Supply Gas (Regulated) Intermediate Pressure HPP-4 0300 1 March 2000
