The PREDU 701 utilizes a direct-acting diaphragm to reduce network pressure. The PREDU P 702 employs a pilot and piston design to maintain more consistent downstream pressure despite fluctuating upstream pressure and flow rates.
PREDU 701 · PREDU P 702
Steam · Air · Industrial Fluids
Direct-acting or pilot-operated
ANSI 150 / 300 · NPT
Downstream pressure engineered for your process
A pressure reducing valve lowers high inlet pressure to a controlled operating pressure. ARI PREDU valves operate without an auxiliary electrical or pneumatic power supply. The PREDU 701 features a direct-acting diaphragm actuator, while the PREDU P 702 incorporates a pilot control to maintain more stable downstream pressure despite variations in flow or inlet pressure.
01
Self-Contained Pressure Reduction
Self-operated design providing precise downstream pressure control tailored to your process requirements.
02
Pressure Stability
PREDU P pilots the main valve disc to maintain precise pressure control, even under fluctuating demand.
03
ANSI End Connections
Available with ASME flanged and NPT threaded connections depending on the series and size.
04
Local Support and Technical Expertise
VAMECA engineers the selection based on your operating pressures, flow rate, and process fluid.
Three Configurations for Pressure Reduction
PREDU 701 for direct-acting pressure reduction, PREDU P 702 for pilot-operated regulation with flanged or NPT threaded connections.
DIRECT ACTING · ASME FLANGES
ARI PREDU 701 ANSI
Direct-acting, self-operated pressure reducing valve engineered with a DMA rolling diaphragm and stainless steel balancing bellows. Its ASME flanged body is specifically designed for reliable pressure reduction across steam, water, and compatible industrial fluid services.
Order
Direct-Acting
ANSI Class
Class 150 · Class 300
NPS Sizes
1″ to 6″
End Connection
ASME Flanges
For steam networks, thermal utilities, and industrial pressure-reducing stations.
PILOT-OPERATED · ANSI FLANGED
ARI-PREDU P 702
Pilot-operated pressure reducing valve for steam and air, engineered to maintain consistent downstream pressure despite fluctuating flow rates or inlet pressure. The piston and pilot control form a compact assembly, complete with fully documented ANSI flanges and pressure classes to ensure reliable local performance.
Order
Pilot-Operated
ANSI Class
Class 150 · Class 300
Nominal Sizes
½″ to 2″
End Connection
Flanges
Engineered for steam processes with fluctuating loads, heat exchangers, and thermal equipment.
PILOT-OPERATED · NPT THREADED
ARI PREDU P 702 NPT
Threaded version of the PREDU P pilot-operated pressure reducing valve, engineered for seamless pressure reduction integration into North American installations. Features NPT threading, a compact design, and precise downstream pressure control for steam and air applications.
Order
Pilot-Operated
ANSI Pressure Classes
150 · 300
NPS Dimensions
½″ to 2″
End Connection
NPT
For compact equipment, auxiliary steam systems, and compressed air circuits.
PREDU 701 or PREDU P 702: Which Valve Best Fits Your Application?
Both technologies automatically reduce pressure. Selection depends primarily on flow rate, supply pressure, and the required downstream precision.
Operating Principle
PREDU 701 · Direct Acting
The diaphragm acts directly on the valve plug to regulate downstream pressure.
PREDU P 702 · Flanges
Pilot-operated control designed to maintain steady, consistent pressure across variable flow rates.
PREDU P 702 · NPT
Same pilot-operated design in a threaded-connection configuration for smaller piping systems.
Selection Criteria
Upstream Pressure
Supply pressure and potential network variations.
Downstream Pressure
Desired setpoint and required stability at the point of use.
Flow Control and Fittings
Required flow rate, NPS, pressure class, flanged or NPT threaded connections.
Send us your upstream and downstream pressures, flow rate, and media. Our technical experts will size and select the optimal ARI-PREDU pressure reducing valve for your system.
ARI Pressure-Reducing Valves for Steam and Process Applications
PREDU pressure reducing valves are engineered for systems requiring precise operating pressure control between the distribution network and process equipment.
DESIGN AND FLOW CONTROL
Direct acting, pilot operation, and maintenance
Each ARI PREDU technology offers distinct features tailored for efficient operation and maintenance. Selection depends on your system's specific pressure requirements and actual operating conditions.
DMA Diaphragm and Bellows
Rolling diaphragm actuator, stainless steel balancing bellows, and downstream pressure control.
Precision Control
Heavy-duty piston, reversible disc, and internal pressure sensing port for simplified regulation and maintenance.
Noise Reduction and Protection Solutions
Series-dependent options including noise reduction cages, soft seats, and steam service trim.
Prepare Your ARI PREDU RFQ
Is this for an existing installation or a new project? These details ensure our technical specialists can prepare an accurate, tailored quote.
Process Fluid
Steam, air, or liquid
Please specify the process media and operating temperature.
Power Supply
Upstream Pressure
Specify the available pressure and its operating range.
Operating Instruction
Downstream Pressure
Specify the required outlet pressure for the pressure regulator.
Sizing
Flow Rate and End Connection
Please provide the flow rate, NPS, and ASME class or NPT thread specification.
Complete Your Pressure Reducing Station
VAMECA also supports your operations with STEVI control valves, CONA steam traps, and ARI engineered packaged systems for your steam networks.
Control & Regulation
ARI-STEVI
Control valves for precise flow, pressure, and temperature management.
Steam Blowdown
ARI-CONA
Steam traps engineered for automatic condensate drainage.
Steam Systems
ARI PREsys
Pre-assembled pressure reducing stations for industrial steam systems.
FAQ
Direct-acting, pilot-operated, ANSI classes, NPT connections, and steam applications.
Looking to install or replace an ARI PREDU pressure reducing valve?
Send us your inlet and outlet pressures, flow rate, and piping system details. VAMECA will help you select the right pressure reducing valve (PRV) and provide a technical quote in Canada.
A Dedicated Technical Representative in Quebec
A dedicated team ready to support your industrial requirements across Canada.
Technical Product Selection
Flow sizing and pressure-reduction technology selection.
Technical Documentation
ARI data sheets, connection specifications, and technical features for the selected model.
