The sealing element is the most important aspect of a pipe connection. Viega press fittings offer three high-quality elastomer sealing elements that are harmonized precisely to specific media, pressures and temperatures in order to provide perfect operation for a long-term industrial application. With a range of uses that varies from compressed air to corrosive chemicals, Viega sealing elements are designed to suit nearly any application.
EPDM Sealing Element
The EPDM (Ethylene Propylene Diene Monomer) sealing element is used in applications like potable water, process water, hydronic heating, fire sprinkler and compressed air. Viega press fittings with green and orange Smart Connect feature dots indicate an EPDM sealing element. It has an operating temperature from 0ºF to 250ºF (-18ºC to 120ºC). EPDM with 316 stainless is approved by NSF-61.
HNBR Sealing Element
The HNBR (Hydrogenated Nitrile Butadiene Rubber) sealing element is well suited for applications that include propane, diesel and fuel oil, as well as other various industrial gases. Viega press fittings have yellow Smart Connect feature dots that indicate an HNBR sealing element. Its operating temperature is from -40ºF to 180ºF (-40ºC to 82ºC). It is specifically designed to meet the requirements of ANSI/CSA LC-4 for CSA approvals for distribution of fuel gas systems.
FKM Sealing Element
The FKM (Fluoroelastomer) sealing element is recommended for applications such as solar, district heating, low-pressure steam, various chemicals and compressed air systems. Viega press fittings with white dots indicate an FKM sealing element. It has an operating temperature from 0ºF to 284ºF (-18ºC to 140ºC) with the capacity to withstand heat spikes up to 356ºF (180ºC).
All Viega ProPress fittings are designed with cylindrical pipe guides to keep the pipe straight and protect the sealing element during assembly. Fittings that do not have cylindrical pipe guides risk making an unsecure connection. Without the pipe guides, installers can damage the sealing element. Viega fittings are pressed before, after and on top of the sealing element in a single step, which creates a permanent connection, secure.