SPOOL-TYPE VALVE AND ASSEMBLY METHOD OF SPOOL-TYPE VALVE Russian patent published in 2011 - IPC F15B13/02 

FIELD: engines and pumps.

SUBSTANCE: spool-type valve includes body with radial holes and slot, spool valve installed in the body with shank and axial slots separated with plugs installed in spool valve opposite radial holes of body and made in the form of pins and forming throttle edges with radial holes of the housing, as well as turn restrictor arranged in slot of body. Slot is made in it in the plane passing through hole axis for spool valve; turn restrictor is made in the form of cylindrical bar installed in hole of shank, made in the plane passing through spool valve axis; at that, diametre d of bar corresponds to width of slot of body, and length H of bar is determined by the formula: , where r -radius of spool valve; H - length of cylindrical bar; R - radius of body; at that, angle between slot axis and axes of radial holes in plane projection perpendicular to hole axis for spool valve corresponds to angle between axis of cylindrical bar and axes of plugs of spool valve in the same plane projection. Manufacturing method of spool-type valve includes making of slot in body, primary installation of spool valve into the body and fixture of spool valve relative to the body, making of radial holes both in the body and in the spool valve, removal of spool valve from the body and making on its belts in plane of radial holes of axial slots, installation into radial holes of spool valve of plugs, heat treatment and final machining of the appropriate cylindrical surfaces of spool valve and body, and repeated installation of spool valve into the body. Slot is made in the plane passing through axis of hole for spool valve; prior to primary installation of spool valve into the body a hole is made in spool valve shank in the plane passing through spool valve axis with diametre corresponding to width of slot in the body; process pin is installed in the above hole and it has the length exceeding spool valve diametre; at that, at primary installation of spool valve into the body the pin is installed into the body slot; process pin is removed from the hole prior to heat treatment and final machining, and cylindrical bar with diametre similar to that of process pin is installed prior to repeated installation of spool valve into the body; after that, cylindrical bar is fixed in shank of spool valve. The above features of the device and method provide alignment of spool vale in body hole at simultaneous elimination of barring of spool valve in circular direction.

EFFECT: improving sensitivity of spool-type valve.

2 cl, 2 dwg