A ceramic control valve may include a shell, a valve stem, a driving valve piece, a fixed valve piece, and a buffer member. The shell has an axial hole at the center portion thereof, and the axial hole comprises a first hole portion and a second hole portion. The lower end of the axial hole has an engaging periphery protruding from the inner periphery of the axial hole, and the first hole portion has at least a water outlet laterally penetrating through the shell. The valve stem comprises a driving end, an adjustment section, and a control shaft sequentially connected together, and a rotating base is securely engaged on the driving end, and the driving end is connected to the driving valve piece through the rotating base. The adjustment section has a plurality of peripheral grooves thereon, and each peripheral grooves comprises a torque adjustment ring disposed thereon.

A ceramic control valve may include a shell, a valve stem, a driving valve piece, a fixed valve piece, and a buffer member. The shell has an axial hole at the center portion thereof, and the axial hole comprises a first hole portion and a second hole portion. The lower end of the axial hole has an engaging periphery protruding from the inner periphery of the axial hole, and the first hole portion has at least a water outlet laterally penetrating through the shell. The valve stem comprises a driving end, an adjustment section, and a control shaft sequentially connected together, and a rotating base is securely engaged on the driving end, and the driving end is connected to the driving valve piece through the rotating base. The adjustment section has a plurality of peripheral grooves thereon, and each peripheral grooves comprises a torque adjustment ring disposed thereon.

A rough-in valve assembly comprising a valve body, wherein the valve body comprises a thermoplastic, the valve body comprises a first fluid inlet, a second fluid inlet, a first fluid outlet, and a second fluid outlet, the valve body comprises a valve chamber configured to receive a fluid mixing valve assembly, and the valve chamber is in fluid communication with the first fluid inlet, the second fluid inlet, the first fluid outlet, and the second fluid outlet. A rough-in valve body may comprise an engineering thermoplastic. A rough-in valve body may comprise an injection molded thermoplastic.