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Dwyer Butterfly Valve, Series WE20

Series WE20 Butterfly Valve

Brand: Dwyer Instruments, LLC
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Dwyer Butterfly Valve, Series WE20
The Series WE20 Butterfly Valves are offered in lug or wafer body styles and is equipped with a PTFE or EPDM liner.

The most critical aspect of the Series WE20 Butterfly Valves is the cartridge seat design, which alleviates installation problems associated with common "dove tail design" seats. Valve torques are lower and more consistent as the seat dynamics are not dependent on being coupled between two flanges.

Precision machining of the disc and body allow the cartridge design to maintain a tighter disc to seat tolerance, providing a perfect low torque seal each and every time the valve is cycled. The seat to disc seal is independent of flange support and capable of full rated dead end service. 

Actuators are directly mounted creating a compact assembly for tight spaces. Limit switches are able to be mounted directly to the valves allowing for remote position indication.

The Series WE20 can be configured with either an electric or pneumatic actuator. Electric actuators are available in weatherproof or explosion-proof, a variety of supply voltages and two-position or modulating control.

Two-position actuators use the supply voltage to drive the valve open or closed, while the modulating actuator accepts a 4-20 mA input for valve positioning. Actuators feature thermal overload protection and permanently lubricated gear train. 

The pneumatic double acting actuator uses an air supply to drive the valve open and closed. The actuator has two supply ports, with one driving the valve open and the other driving the valve closed.

Spring return pneumatic actuators use the air supply to open the valve, and internally loaded springs return the valve to the closed position.

The pneumatic double acting actuator uses an air supply to drive the valve open and closed. The actuator has two supply ports with one driving the valve open and the other driving the valve closed.

Spring return pneumatic actuators use the air supply to open the valve and internally loaded springs return the valve to the closed position. 

Also available is the SV3 solenoid valve to electrically switch the air supply pressure between the air supply ports for opening and closing the valve.

Actuators are constructed of anodized and epoxy coated aluminum for years of corrosion free service.
Features
  • Machined Flats Attach disc/stem - no pins
  • Phenolic backed cartridge seat design for extended service and ease of replacement
  • Extended neck for insulation - no fabricated extensions required
  • Capable of being configured to fit any application
  • Limit switches can be mounted to manual valves for remote monitoring

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Specifications

Brand

Actuator Type

  • Double-Acting
  • Handwheel
  • Pneumatic
  • Spring Return

Bearing Material

  • Nylatron

Duty Cycle

  • 85%

Enclosure, Body Material

  • Aluminum - Anodized
  • Ductile Iron
  • Epoxy Coated Aluminum End Caps
  • Powder-Coated Aluminum

Environmental Protection

  • Explosion-proof: Class I, Groups C & D, NEMA 7, Class II, Groups E, F, G, Division I & II
  • Hazardous Area
  • IP67
  • NEMA 4X
  • NEMA 7

Flange Size - 10” (DN 250)

  • 10” (DN 250) - 125#
  • 10” (DN 250) - 150#

Flange Size - 12” (DN 300)

  • 12” (DN 300) - 125#
  • 12” (DN 300) - 150#

Flange Size - 2-1/2” (DN 65)

  • 2-1/2” (DN 65) - 125#
  • 2-1/2” (DN 65) - 150#

Flange Size - 2” (DN 50)

  • 2” (DN 50) - 125#
  • 2” (DN 50) - 150#

Flange Size - 3” (DN 80)

  • 3” (DN 80) - 125#
  • 3” (DN 80) - 150#

Flange Size - 4” (DN 100)

  • 4” (DN 100) - 125#
  • 4” (DN 100) - 150#

Flange Size - 5” (DN 125)

  • 5” (DN 125) - 125#
  • 5” (DN 125) - 150#

Flange Size - 6” (DN 150)

  • 6” (DN 150) - 125#
  • 6” (DN 150) - 150#

Flange Size - 8” (DN 200)

  • 8” (DN 200) - 125#
  • 8” (DN 200) - 150#

Input

  • 4-20 mA

Media

  • Compatible Gases
  • Compatible Liquids

Mounting

  • NAMUR

NPT Connection

  • 1/2” NPT Female

O-Ring Material

  • EPDM - Wetted Material
  • PTFE - Wetted Material

Power Requirement

  • 110 Vac
  • 220 Vac
  • 24 Vac
  • 24 Vdc

Pressure Range

  • psi: 225 (kPa: 1,550, bar: 15.5)

Seat / Seal Material

  • EPDM - Wetted Material
  • PTFE - Wetted Material

Size

  • Line: 2” to 12”

Standard Features

  • Position Indicator & Two Limit Switches

Stem Material

  • 410 Stainless Steel - Wetted Material

Supply Pressure

  • psi: 40 to 115 (kPa: 270 to 790, bar: 2.7 to 7.9)

Supply Pressure - Maximum

  • psig: 120 (kPa: 800, bar: 8)

Temperature Range

  • -18° to 149° C (0° to 300° F)

Wetted Materials

  • 316 Stainless Steel

  • Gas or Liquid Flow Control

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