Flange inside form has been finely standardized by us to make sure while torquing
pressure on gasket which shows up as tightening torque comes as much earlier to
gasket reaching flange thread start as possible.
Threads on flange are rolled.Form at thread start of flange prior to rolling has
been standardized to yield a shape and configuration that results in minimal hooking.
Our rubber gasket compound formulation and process parameters have been standardized
to yield high resilience.For a constant applied torque our gasket flows less into
flange thread start and at same time has high resilience to spring out when torque
Our rubber gasket formulation and imparted physical properties allow enough pre-torque
generation with plug gasket seat when inserted into plug that helps in extracting
gasket out of flange thread whatever little it penetrates at the time of unscrewing
Our plug thread end towards gasket side has been standardized by feathering it out,not
only does it increase tool life at time of thread rolling but also it fills crevices
in flange thread start to restrict gasket entry into it.
Combination of our special plug geometry around gasket seat finely controlled and
standardized,gasket dimensions and properties,flange inside curl shape yields flow
path to gasket against applied torque that results in minimal gasket flow into flange
S M Saraf
Patent for Hybrid Plug