Low noise water-control valve for hydraulic and sanitary pipes

A valve preventing water hammers within a water-sanitary installation comprising

• a valve body having a cylindrical shape and provided with teeth made at an inner surface of the valve body;
• a piston holder having a cylindrical shape closed at a first end, wherein the piston holder is inserted movably in an axial direction into the valve body;
• a spiral furnished in and enclosed by an inner wall of the piston holder in a region of the first end;
• second spiral teeth shifted by 90.degree. in relation to each other and furnished on a bottom head surface placed at a second end of the piston holder and enclosed by the piston holder;
• at least two spring-type teeth coupled with the teeth of the valve body and enclosed by the piston holder to prevent overwinding of the valve;
• a leading spiral spindle provided with a thread at a first end and provided with a rim having a first spiral teeth shape matching the second spiral teeth of the piston holder, wherein the leading spiral spindle is inserted rotatably into the piston holder and is screwed into the spiral of the piston holder by means of the thread of the leading spiral spindle;
• a valve seat holder enclosing a rubber seal, wherein the valve seat holder is attached to the valve body and is provided with grooves furnished in an inner wall of the valve seat holder;
• a piston valve attached to the first end of the piston holder and provided with piston teeth cooperating with at least one groove of the valve seat holder, wherein the piston valve moves towards the valve seat holder during a closing of a valve and wherein said piston teeth slip within the at least one groove when the piston valve is seated on a seat of the rubber seal to prevent overtightening of the piston valve against the seat;
• and
• a key passing through a piston holder wall securing the leading spiral spindle against falling out from the piston holder.

A valve for preventing water hammers within a water-sanitary installation comprising

• a valve body having an outer cylindrical surface, an inner cylindrical surface, said valve body having a first axial end and a second axial end;
• a piston holder having an outer cylindrical surface and an inner cylindrical surface, with an inner spiral thread on the inner cylindrical surface of the piston holder, a first axial end, and a second axial end, wherein the piston holder is inserted in an axial direction into the valve body such that the first axial end of the piston holder is disposed inside the first axial end of the valve body and such that the second axial end of the piston holder is disposed inside the second axial end of the valve body;
• a spindle disposed inside the inner cylindrical surface of the piston holder and having an outer spiral thread for engaging the inner spiral thread of the piston holder, wherein the spindle is inserted rotatably into the piston holder end is screwed into the inner spiral thread of the piston holder by means of the thread of the spindle;
• a rim attached to the spindle;
• a first spiral tooth attached to a first axial face of the rim;
• a second spiral tooth attached to an axial face of the second axial end of the piston holder, and disposed facing the first spiral tooth attached to the rim;
• two inner teeth disposed on the inner cylindrical surface of the valve body and projecting inwardly from the cylindrical surface of the valve body;
• two outer teeth disposed on the outer cylindrical surface of the piston holder, wherein the inner teeth and the outer teeth are disposed such as to engage each other upon rotation of the piston holder in the valve body and such as to furnish a slipping motion sound when no further common rotation of the valve body and of the piston holder occurs and a relative end position of the valve body and of the piston holder has been reached while an overtightening of a piston valve against a seat is prevented.