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Piping Systems & Welding

Plastic Valves and Piping Systems

Low Torque AV Gaskets (1/2" – 12")

Asahi valve gaskets offer a unique double convex ring design that gives optimum sealing with only 1/3 the torque commonly required with flat faced gaskets. Asahi/America offers EPDM gaskets from 1/2" to 12"; PTFE-bonded EPDM gaskets in sizes from 1/2" to 12"; and PVDF-bonded EPDM gaskets from 1/2" to 10".

AV low torque gaskets provide a bubble tight seal for flanged valve and piping connections. They feature a small bolt torque requirement for ease of installation and for accommodating a variety of thermoplastic valves, piping and fittings. All styles include two molded concentric sealing rings for confident sealing abilities. The sulfur-cured rubber is made to fit with flat faced flanges and is available with either a PVDF or PTFE laminated sealing surface for aggressive chemical or high purity installations.

Backing Rings (Euro Grey: 1/2" – 12"; Black: 1/2" - 24")

Two Backing Ring

Flange connections are an essential part of every piping system. For detachable connections to butterfly valves or transitions to other materials, Asahi/America’s backing rings, installed with plastic stub end flanges, are the ideal solution to provide a force-locking connection offering superior safety for any system.


Data Sheets


Ideal Applications Include:

Chemical processing, bleach plants, aquariums, mining, water treatment, landfills, swimming pools, power plants

AV Gasket Sizes:

1/2" – 12"


EPDM, PVDF-bonded EPDM, PTFE-bonded EPDM

Bolt Patterns:

ANSI 150#

Backing Rings Sizes:

Euro Grey: 1/2" – 12"

Black: 1/2" - 24"


PP with steel insert

Bolt Patterns:

ANSI 150#

JIS and DIN also available


AV Gaskets

  • PTFE- or PVDF-bonded EPDM for maximum corrosion resistance and high fluid purity
  • Perfect sealing at low bolt tightening torque ratings for longer gasket life
  • Ideal for plastic piping systems, as well as metal or plastic-lined metal systems
  • Sulfur cured
  • Approximately 1/3 of the bolt tightening torque compared with flat or envelope type gasket
  • PTFE-bonded gasket available for the most corrosive applications
  • PVDF-bonded gasket ideal for the following:
    • Semiconductor industry due to its purity
    • Aggressive chemicals (strong acids, bases, halogens)
    • Volatile media (fluids that generate gas): PVDF has a permeability of about 1/50th of PTFE
  • Proprietary laminating process for bonding to EPDM that allows for the greater elasticity required for low torque gaskets

Backing Rings

  • Fiberglass reinforced PP coated steel
  • Available in UV resistant black or Euro grey PP
  • Sized specifically for DIN metric piping
  • Standard stock of ANSI 150# bolt pattern
  • JIS and DIN patterns available