Excess pressure regulator / back pressure sustaining valve - PREDEX | ARI | Philippopoulos s.a.
Excess pressure regulator / back pressure sustaining valve - PREDEX | ARI | Philippopoulos s.a.

Excess pressure regulator / back pressure sustaining valve - PREDEX | ARI

Take Control with the Excess Pressure Regulator / Back Pressure Sustaining Valve - PREDEX | ARI

Maximize the safety and efficiency of your industrial piping systems with the Excess pressure regulator / back pressure sustaining valve - PREDEX | ARI. This advanced valve is designed to keep your system pressure balanced, preventing costly downtime and protecting sensitive equipment from excessive pressure.

Features & Benefits of Excess Pressure Regulator / Back Pressure Sustaining Valve - PREDEX | ARI

  • Consistent Pressure Management: Automatically maintains steady back pressure in your pipelines, safeguarding your valuable machinery from harmful surges.
  • Reliable Safety: Delivers quick and efficient response to excess pressure, reducing the risk of leaks or bursts to ensure a safe workplace.
  • Easy Installation: User-friendly design allows for straightforward integration into any industrial setup, minimizing installation time and costs.
  • Minimal Maintenance: Built with durable materials that withstand demanding conditions, saving you on maintenance and replacement expenses.
  • Accurate Performance: Engineered for precise regulation, this valve delivers stable and reliable performance, even under fluctuating loads or variable flow rates.
  • Versatile Application: Suitable for a broad range of industrial uses, including steam, air, water, and neutral gases, making it a flexible solution for many processes.
  • Enhanced Efficiency: Helps optimize overall system operation, supporting energy savings and consistent process quality.

The PREDEX | ARI valve offers simplicity without sacrificing technical value. Its intuitive mechanism senses system pressure and springs into action to maintain the desired level, automatically adjusting as needed. This proactive protection means less stress for your team and more uptime for your business.

Choose the Excess pressure regulator / back pressure sustaining valve - PREDEX | ARI for a smart, effective way to control pressure in your industrial operations. Put reliability, safety, and efficiency first—because your system deserves the best protection.

Standard (Options)
  • DIN
Connection (Options)
  • Flanged
Material (Options)
  • EN-JL 1040 (GG25) Cast iron
  • EN-JS 1049
  • 1.0619+N
Pressure Rating (Options)
  • PN 16

Datasheet and documents

Description

✅ Self-operated, proportional control
✅ Rolling diaphragm actuator for accurate pressure adjustment
✅ Available in nominal diameters DN15 - DN150
✅ Adjustable inlet pressure ranges from 0.2 to 16 bar
✅ Pressure-balanced stainless steel bellows for precise regulation
✅ Optional PTFE soft-seated plug for enhanced sealing (max 200°C)
✅ Low-noise operation with optional flow divider


Technical Specifications

Valve Types & Configurations

  • Excess pressure regulator with diaphragm actuator UDA
  • Straight-through design for minimal pressure loss
  • Bellows-sealed spindle for improved reliability


Material Options & Pressure Ratings

Model Nominal Pressure (PN) Material Nominal Diameter (DN) Inlet Pressure Range (bar)
12.705 PN16 EN-JL1040 DN15-150 0.2 - 16
22.705 PN16 EN-JS1049 DN15-150 0.2 - 16
23.705 PN25 EN-JS1049 DN15-150 0.2 - 16
34.705 PN25 1.0619+N DN15-150 0.2 - 16
35.705 PN40 1.0619+N DN15-150 0.2 - 16

Other materials and custom versions available upon request.


Flow Performance & Dimensions

DN (Size) Kvs Value (m³/h) Seat-Ø (mm) Travel (mm) Face-to-Face Dimension (mm)
DN15 3.2 18 4 130
DN20 5.0 22 5 150
DN25 8.0 25 6 160
DN32 12.5 32 8 180
DN40 20.0 40 8 200
DN50 32.0 50 10 230
DN65 50.0 65 11 290
DN80 80.0 80 13 310
DN100 125.0 100 16 350
DN125 190.0 125 19 400
DN150 280.0 150 22 480

Shut-off Class: Leakage Class I (DIN EN 1349 / DIN EN 60534-4) – ≤ 0.05% of Kvs value


Pressure & Temperature Ratings

Material PN Rating Temperature Range Max Operating Pressure (bar)
EN-JL1040 PN16 -10°C to 120°C 16
EN-JS1049 PN16 -10°C to 250°C 16
EN-JS1049 PN25 -10°C to 250°C 25
1.0619+N PN25 -60°C to 450°C 25
1.0619+N PN40 -60°C to 450°C 40

Note: For temperatures above 250°C, a water seal pot must be installed to protect the diaphragm actuator.


Actuation & Control Mechanism

Diaphragm Actuator – UDA 40 to UDA 400

  • Rolling diaphragm for sensitive pressure control
  • Spring-loaded mechanism for self-regulating pressure adjustment
  • Actuator sizes:
    • UDA 400: Large capacity (high control accuracy)
    • UDA 250 / 160 / 80 / 40: Compact versions for various pressure ranges
  • Diaphragm materials:
    • EPDM (-40°C to +110°C) – Suitable for water, steam, and gases
    • NBR (-40°C to +100°C) – Suitable for oils and neutral gases


Applications

✔ Pressure regulation in steam & condensate systems
✔ Gas and vapor regulation in pipelines
✔ Pump protection by preventing excessive pressure buildup
✔ Overpressure prevention in heat exchangers and boiler systems
✔ Control of pressure fluctuations in industrial processes


Installation & Operation

  • Designed for simple, inline installation
  • Pressure setting easily adjustable via spring tension
  • Available with DIN EN 1092-1/-2 flanges
  • Optional flow restrictor for noise reduction

Tests and Certification

DGRL 2014/68/EU (PED Pressure Equipment Directive)