초록 ▼

The invention provides a self-cleaning inlet head for a fluid, operable in a first, draining, mode and in a second, backflushing, mode, including a body having a front end and a rear end; a piston slidably mounted in the body and having having a front face and a rear face; a first space extending be

The invention provides a self-cleaning inlet head for a fluid, operable in a first, draining, mode and in a second, backflushing, mode, including a body having a front end and a rear end; a piston slidably mounted in the body and having having a front face and a rear face; a first space extending between the rear end of the body and the rear face of the piston and a second space extending between the front face of the piston and the front end of the body; a bore connecting the first space and the second space; a valve mounted in the first space for closing off the bore during the second mode of operation; an aperture for access of the fluid from outside the head into the second space in the first mode of operation, and for exit from the second space in the second mode of operation, wherein, at the onset of the second mode of operation, the valve closes off the bore and subsequently moves the piston, thereby initiating a mechanical shearing action loosening any occluding matter in the aperture. The mechanical action is followed by an hydraulic flushing action.

대표청구항 ▼

A self-cleaning inlet head for a fluid, operable in a first, draining, mode and in a second, backflushing, mode, comprising: a substantially cylindrical body having a front end and a rear end, said rear end having means for connection to a draining and backflushing tube; piston means slidably mounte

A self-cleaning inlet head for a fluid, operable in a first, draining, mode and in a second, backflushing, mode, comprising: a substantially cylindrical body having a front end and a rear end, said rear end having means for connection to a draining and backflushing tube; piston means slidably mounted in said body and having a piston rod extending towards said front end, said piston means having a position of rest towards which it is urged by a biasing spring, said piston means having a front face facing said front end and a rear face facing said means for connection; a first space extending between said means for connection and the rear face of said piston means, and a second space extending between the front face of said piston means and the front end of said body; at least one bore at least passing through said piston means and connecting said first space and said second space; valve means mounted in said first space and provided with means preventing it from closing off said means for connection to said draining and backflushing tube during said first mode of operation, but permitting it to close off said at least one bore connecting said first and said second space during said second mode of operation; at least one aperture as a means for access of said fluid from outside of said head into said second space whilst being strained in said first mode of operation, and for exit from said second space whilst flushing said at least one aperture in said second mode of operation, wherein, at least at the onset of said second mode of operation, said valve means closes off said at least one bore and subsequently moves said piston means and said piston rod, thereby initiating a mechanical shearing action loosening any occluding matter in said at least one aperture, said mechanical action being followed by a hydraulic flushing action, as soon as said piston means has moved from said first space into said second space.