Rotary valve

A rotary valve kit comprising:

• a main valve body including a body, a seat disposed in said body, a valve body disposed in said body, said valve body being rotatable through said seat, a stem entering said body and imparting opening and closing motions to said valve body, and an attaching-detaching part slightly projecting from said body at a position where said stem enters said body and having an upper flat fitting surface on which a plurality of threaded screw holes are formed, said main valve body being a common component part;
• an operating part adapted to operate said valve body;
• at least two of a first component part, a second component part, and a third component part, wherein
• said first component part includes a first coupling part adapted to be detachably fastened at one end to said attaching-detaching part via a baffle fitting and a screw and another end of said first coupling part being mountable on said operating part to join said attaching-detaching part and said operating part, said first coupling part having a long cylindrical shape and a flange-shaped mounting part at said another end adapted to have said operating part mounted therewith,
• said second component part includes a second coupling part adapted to be detachably fastened at one end to said attaching-detaching part via a baffle fitting and a screw and an another end of said second coupling part being mountable on said operating part to join said attaching-detaching part and said operating part, said second coupling part having a short cylindrical shape and a flange-shaped mounting part at said another end adapted to have said operating part mounted therewith,
• said third component part includes a third coupling part having a short cylindrical shape and adapted to be detachably fastened at one end to said attaching-detaching part via a baffle fitting and a screw adapted to accommodate said stem thereon, said third coupling part being adapted to allow motion of said operating part therein along a length of said third coupling part, wherein an outer periphery of said stem and an inner periphery of said third coupling part form an empty part, a spring being disposable between said operating part and said third coupling part, said spring being adapted to urge said operating part to a position away from said main valve body within said third coupling part, a stopper part disposed in the empty part and adapted to form a rotation restricting area for said operating part, and an engaging part disposed in the empty part and adapted to lock said valve body in one of a wholly open, a wholly closed, and an intermediate open position, and wherein
• said rotary valve kit selectively constitutes a long-neck rotary valve when said first component part is combined with said main valve body and said operating part, a short-neck rotary valve when said second component part is combined with said main valve body and said operating part, and a non-neck rotary valve when said third component part is combined with said main valve body and said operating part.