Van bướm ASAHI - Type 57 (DN40 - DN350)

Van bướm ASAHI - Type 57 (DN40 - DN350)

Butterfly valves are named for the wing-like action of the flow-controlling disc, which operates at right angles to the flow. The disc has about the same diameter as the connecting pipe, and the flow is straight through, with a low pressure drop. Maintenance is easy due to the small number of moving parts. The butterfly valve can be used either as an on/off or modulating type of valve. Asahi/America has recently developed the advanced Type 57 Valve, which has no metal to media or environment contact whatsoever. These valves may be operated manually, electrically, or pneumatically.



New Design Features

  • Flange Stopper - Prevents over-compressing liners due to improper installation
  • Absorption Channel - Never worry about an over-tightened liner causing excessive stem torque
  • Spherical Disc - Gain higher Cv and extended valve life cycle as a result of new disc design
  • Plasgear Plastic Gear Operator - The first industrial, non-metallic gear box - Offers superior corrosion resistance

Features and Benefits

  • Standard model (1 1/2"DN40 - 14"DN350) has PVC body and PP disc for better chemical resistance at temperatures higher than can be achieved with PVC.
  • Our 316/403 stainless steel shaft has full engagement over the entire length of the disc and is a non-wetted part, totally isolated from the media.
  • Only solid and abrasion-resistant plastic disc and elastomeric liner are wetted parts.
  • ISO bolt circle on top flange - no body or stem modifications required for accessories.

Typical Applications

  • Chemical Processing
  • Water & Wastewater
  • Landfills
  • Irrigation
  • Food Processing
  • Mining

Available Actuators

  • Series 79 Pneumatic
  • Series 92 & 94 Electric
  • Series 83 Electromni


  • Pneumatically and electrically actuated with accessories
  • Alternate discs:

(I) PVC : 1 1/2" - 14"
(III) PVDF : 1 1/2" - 14"

  • Gear operators for 1 1/2" - 6"
  • Lug style (stainless steel 304 or 316) as blocking and end-of-line applications
  • Stems in 316 stainless steel, titanium, Hastelloy C® etc.
  • 2" square nut on stem
  • 2" square nut on gear operator
  • Stem extensions (single stem and two-piece stem)
  • Locking devices (gear type - standard on lever)
  • Chain operators
  • Manual limit switch
  • Tandem arrangements (patented by A/A, Inc.)


Thông số kỹ thuật


Sizes:Lever: 1-1/2" - 8"
Gear:  8" - 14"

Models:Wafer Style

Operators:Lever and gear

Bodies:PVC, PP and PVDF

Discs:PVC, PP and PCDF

Seats:EPDM or FKM and Nitrile®

Seals:EPDM or FKM and Nitrile®

Stems:403 and 316 stainless steel, titanium, Hastelloy C®