The basic pressure Reducing Valve structure is very similar for all valve manufacturers and consists of three main parts:
1. A valve body assembly, that incorporates a seat arrangement;
2. An internal trim, which consist of a plug, shaft and actuator (normally
diaphragm or piston);
3. A bonnet (or cover) assembly.
The differences between the different valves are in the body shape, actuator & guiding mechanism design and in some few cases