• The grooved piping concept is simple and reliable. The coupling housing performs several functions as an integral part of the pipe joint. It contains gasket, which is fully enclosed, reinforcing and securing it in position for proper sealing. The housing also engages on the pipe around the full pipe circumference and creates a unified joint while providing the advantages of mechanical joining.

• VISION gasket consists of bridge, ribs and lips. All these three parts are designed in accordance with Fluid Mechanical and elastic seal theory. The VISION gasket is pressure responsive, providing the sealing efficiently.

• The combination of VISION gasket characteristics creates a permanent, leak-tight triple seal on a variety of piping materials.

• Housing: Ductile Iron conforming to ASTM A536, Grade 65-45-12, refer to publication 14.01-1 for details. Other material is available upon special request.

• Housing Coating:

  North America: Orange Epoxy, Dipped

  Other Countries: Red Epoxy, Dipped or Powered

   Galvanized coating is also available.

• Gasket: EPDM rubber, more available gasket material options refer to page 7, or refer to “General Catalog”

• Bolts/nuts

  1/2(M12) and less, class 9.8 bolt is used for all couplings and mechanical tees. 

  5/8(M16) and larger, class 8.8 bolt is used. 

  Other materials are available upon special request.

  North America: White Zinc

  Other Countries: Gold Zinc.

VISION piping system provides both rigid and flexible joints. The Rigid coupling does not allow for movement, similar to a flange or welded joint. Flexible coupling allows for controlled liner and angular movement which accommodates pipeline deflection as well as expansion/ contraction

• Initial Seal:

  The gasket forms an initial seal as it is stretched over the pipe ends, similar as O-ring sealing principle.

• Secondary Seal:

   The gasket is then slightly compressed as the housings are tightened to secure the gasket lips in a firm seat on the pipe, between the grooves and the pipe ends, which forms a secondary seal.

• Final Seal:

  Line pressure serves to strengthen the seal through the combination of normal gasket resilience, housing reinforcement and the action of pressure downward to the lips, which forms a final seal.

  Dry Fire-fighting system is applicable for the frozen/ice-cold occasion. Preauction fire-fighting system is suitable for sensitive water area and easy frozen occasion. While there is the compressed air inside of the pipe under the frozen circumstance, the remaining water may be frozen and then destroy the joint, or the ice grain any block the sprinkler head. At the same time, condensing water would be presented while the dew point temperature is higher than ambient environment. The internal surface of pipeline will be corroded by condensing water if it still leaves in the pipe for long time. So G04 gasket is recommended to be used for Dry system and preauction system which to prevent the water remaining problem in the cavity of gasket.

   For the large pipe connection in Dry hydrant system and sprinkler system. UGS is highly recommended to be used. G08 gasket is able to prevent the cavity of gasket from water.