A single-ported double seated valve mechanism comprising valve body means having an inlet and outlet communicated by a flow passage and a chamber positioned within said flow passage, a valve bonnet secured to said valve body means, a valve trim assembly fixedly secured to said bonnet and positioned within said chamber, said valve trim assembly further comprising a valve cage having an upper end and a base, said upper end being connected to said valve bonnet, a seat ring connected to said base of said valve cage, a first seal disposed within a recess in said seat ring, a second seal disposed within a recess in said upper end of said valve cage, and a valve stem,Instrumentation Ball Valves a valve plug and a spring positioned within said valve cage, said bonnet and said valve trim assembly being removable from said valve body means as a unit, said bonnet having a portion outwardly extending from said valve body means, said outwardly extending portion of said bonnet being sized to be received within said chamber within said valve body means,Balance Valves whereby said valve body means serves as a support or vise.
The valve mechanism of claim 2 including a valve actuator with an actuator stem, said actuator being attached to said valve body means in a position opposite said valve bonnet, said actuator stem operating said valve plug by pushing only, said actuator stem abutting said valve plug but not being fixedly attached to said valve plug.

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