Butterfly valve - ZESA | ARI | Philippopoulos s.a.
Butterfly valve - ZESA | ARI | Philippopoulos s.a.

Butterfly valve - ZESA | ARI

ARI-ZESA® Wafer Butterfly Valve

The ARI-ZESA® is a soft-sealing wafer-type butterfly valve with elongated centering holes for installation between EN 1092-1 flanges. It is primarily used as an isolation valve in water networks, HVAC, cooling systems, industrial utilities, and process air applications.

Technical Specifications

  • Nominal Diameters: DN 25–600
  • Pressure: PN 6, PN 10, PN 16
  • Max Differential Pressure: 16 bar up to DN150, 10 bar from DN200–600
  • Body: Spheroidal Cast Iron 5.3106 / EN-GJS
  • Disc: Stainless Steel 1.4581, with alternative versions per DN
  • Shaft: 1.4021+QT, optionally 1.4571 or 1.4542
  • Leakage Test: EN 12266-1, leakage rate A

Seat Selection

Elastomer selection should be based on temperature, fluid, and chemical compatibility.

  • EPDM: -10 to +130 °C, suitable for water, cold/hot water, HVAC, and potable water with DVGW.
  • NBR: -10 to +80 °C, for air, inert gases, and applications with limited oil presence.
  • FPM: 0 to +150 °C, for specific chemicals or oily media; not recommended for hot water.

Actuation

ZESA can be delivered with lever, gearbox, chain gearbox, electric actuator, or pneumatic rotary actuator. Selection depends on operating torque, handling frequency, installation access, and automation signal.

ZESA vs. GESA

ZESA is wafer type and installed between two flanges. GESA is lug type with threaded holes and can be used when disconnection of one pipeline side or end-of-line valve function is required.

FAQs

Is it suitable for steam?
For continuous saturated steam, metal-sealed valves are usually preferred. ZESA should be evaluated based on temperature, pressure, and seat.

Does it require maintenance?
The design is maintenance-free without regular lubrication. In services with deposits, periodic operation and leakage checks are required.

Where is it commonly used?
In closed water circuits, cooling, air conditioning, pumping stations, utility networks, compressed air, and general industrial isolation lines.

Standard (Options)
  • DIN
Connection (Options)
  • Flanged (Wafer)
Material (Options)
  • EN-JS 1030 (GGG40) Ductile Iron
Pressure Rating (Options)
  • PN 6
  • PN 10
  • PN 16
Seat (Options)
  • EPDM
  • FPM
  • NBR
Actuator (Options)
  • Handwheel
  • Gearbox
  • Pneumatic
  • Electric

Datasheet and documents

Description

✅ Soft-sealing, maintenance-free design
✅ Excellent flow characteristics with optimized Zeta-values
✅ Double stem sealing for leak protection
✅ DVGW-certified for drinking water applications (EPDM version)
✅ Full insulation possible according to EnEV (Energy Saving Order)
✅ Wide range of actuators: manual, electric, and pneumatic

Technical Specifications

Valve Types & Configurations

  1. ARI-ZESA® (Wafer Type) – Butterfly valve with elongated eyelets
  2. ARI-GESA® (Lug Type) – Butterfly valve with threaded eyelets, suitable as pipe-end valve


Material Options

Component Material
Body EN-GJS-400-15 (Ductile Iron), EN-JS1030
Seat EPDM (-10°C to +130°C), NBR (-10°C to +80°C), FPM (0°C to +150°C)
Disc Stainless Steel 1.4581 / CuAl10Fe5Ni5-C (Optional for DN40-500)
Stem X20Cr13+QT (1.4021+QT) / X6CrNiMoTi17-12-2 (1.4571 for DN ≤ 300)


Pressure & Temperature Ratings

  • Nominal Pressure Ratings: PN6, PN10, PN16
  • Max Differential Pressure:
    • 16 bar (DN25-150)
    • 10 bar (DN200-500)
  • Flange Connections: DIN EN 1092-1
  • Leakage Test Compliance: DIN EN 12266-1 (Leakage Rate A)
  • Drinking Water Certification: DVGW (EPDM) DW-6201BR0244

Tests and Certification

DIN DVGW registration "water" for EPDM (DN25/32-500)
DIN EN 13774 (Stop valves for gas and water PN 4 till PN16)
DGRL 2014/68/EU (PED Pressure Equipment Directive)
GOST-R (Russia)

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