Diaphragm valve - SW/BW | Zubi | Philippopoulos s.a.
Diaphragm valve - SW/BW | Zubi | Philippopoulos s.a.

Diaphragm valve - SW/BW | Zubi

Diaphragm Valve Zubi SW/BW

The Zubi SW/BW is a diaphragm valve with welded ends, available in straight-through type T85 or weir type T100. The body is monoblock cast, bidirectional, with a bolted bonnet and reinforced woven diaphragm construction. Connections are SW – Socket Welding or BW – Butt Welding, suitable for installations where permanent welding is preferred over flanges or threading.

Technical Specifications

  • Body Types: straight or weir.
  • Connections: SW and BW.
  • Body Material: GGG50 or CF8M / AISI 316, other materials upon request.
  • Bonnet: GG25.
  • Sealing: watertight shut-off.
  • Installation: permissible in any position, with maintenance accessibility check.
  • Manual straight version pressures: DN20–DN50 at 8 bar, DN65 at 6 bar. Actuated versions require datasheet verification.

Diaphragms and Media Compatibility

Available diaphragms: Butyl, aliment Butyl, reinforced Butyl, Natural Rubber, aliment Natural Rubber, EPDM, Hypalon, Neoprene, Nitrile, Silicone, Viton, and PTFE only in the weir version. Selection is based on chemical compatibility, temperature, pH, cycle frequency, and presence of solids. The SW/BW version is not available with rubber-lined body, making body material crucial in corrosive applications.

Applications

Used in water and wastewater, pulp & paper, power generation, mining, powder & bulk handling, chemical circuits, and food/beverage applications when contact materials are compatible with the medium.

Handling and Automation

Available with manual operation, pneumatic actuator air-open, air-close, or double acting, electric actuator, and gearbox. Options: position indicators, limit switches, solenoid valves, padlocks, mechanical limit switches, and positioner 4–20 mA.

Difference Between Straight and Weir

The straight-through version is preferred for freer passage. The weir version is chosen for shorter diaphragm travel and the ability to use PTFE diaphragm.

Description

Main Features

  • Monoblock body, one piece cast.
  • Socket Welding (SW) and Butt Welding (BW) options.
  • 100% tightness performance guaranteed.
  • The valve can be installed in any position.
  • High strength woven Diaphragm reinforced design.
  • Bolted bonnet design.
  • Easy maintenance: Three part design (Body, diaphragm and actuator) allows maintenance and actuator retrofitting without removing the valve body from the pipeline.
  • Bidirectional shut off design.

DIRECTIVAS

  • DIR 2006/42/CE (machinery)
  • DIR 2014/68/EU (PED) Fluid Group 1(b), 2 (Cat. I. mod. A)
  • DIR 2014/34/EU (ATEX) Area 2&22

Technical Data

FLANGE CONNECTION

  • SW (Socket Welding)
  • BW (Butt Welding)

SIZES & PRESSURES

  • Manual straight valves:
  • DN20 to DN50: 8 bar
  • DN65: 6 bar

For actuated valves, please refer to the appropriate datasheets.

TIGHTNESS

  • Watertight

MATERIALS

BODY  GGG50, CF8M (AISI316) Others on request.

DIAPHRAGM 

  • Butyl (BU) Blue
  • Aliment butyl (BUA)
  • Reinforced butyl (BUR)
  • Natural rubber (BL) White
  • Natural aliment rubber (BLA)
  • EPDM (EP)
  • Hypalon (HY) Green
  • Neoprene (NE) Red
  • Nitrile (NI) Yellow
  • Silicone (SI)
  • Viton (VI) Orange
  • PTFE (TE) (availabe in weir version)

*The abbreviations or the identification colours are in the flap of the diaphragm. *The pneumatic actuator diaphragm made in Natural rubber (BL).

BONNET GG25 Others on request.

ACTUATORS

Manual, air open actuator, air to close actuator, double acting actuator, electric, gear box.

ACCESSORIES AND OPTIONS

Position indicators, switches, solenoid valves, padlocks, mechanical limit switches, positioner 4/20mA.