Control valve

A control valve for a steam power plant comprising:

• a hollow valve body having an inlet and an outlet;
• a cylindrical valve bonnet in said housing;
• a cylindrical plug guide extending from an end of said bonnet within said housing and secured to said bonnet by a plurality of short bolts extending longitudinally through a portion of the plug guide and threaded into the end of the valve bonnet, said plug guide having an opening therethrough in communication with the inlet of said valve body and a free open end in communication with the outlet of said valve body;
• a valve seat secured to the free open end of the plug guide between the end of the plug guide and the outlet of the valve body by a plurality of long bolts extending longitudinally through the valve seat and a portion of the plug guide and threaded into the plug guide so that the plug guide and valve seat can be removed as a single unit.

In a steam power plant system a control valve for controlling the flow of the steam comprising:

• a hollow valve body having a steam inlet at one side and a steam outlet at one end;
• a cylindrical valve bonnet in said housing;
• a cylindrical plug guide extending from an end of said valve bonnet toward said steam outlet and secured to said valve bonnet by a plurality of short bolt extending longitudinally through a portion of the plug guide and threaded into the end of the valve bonnet, said plug guide having an opening therethrough in communication with the interior of the valve body;
• a valve seat secured to the end of the valve guide by a plurality of long bolts extending longitudinally through the valve seat and a portion of the plug guide and threaded into the plug guide and located at said steam outlet in the valve body so that the plug guide and valve seat can be removed as a single unit;
• a valve plug slidably mounted in said plug guide;
• and
• means for moving said valve plug into and out of engagement with the valve seat to control the flow of steam through said valve.