An axial-flow single-seat valve with automatic impurity removal for the valve seat

Abstract

The invention provides an axial-flow single-seat valve with automatic impurity removal for the valve seat, which includes a valve body, a valve cover and a valve stem. A valve seat is installed in the water outlet channel, the valve cover is sealed and installed on the valve stem installation port, and the valve stem is slidably arranged in the valve stem installation port, and it is characterized in that it also includes a guide piece and a valve core group, The spool set passes through the guide and is connected to the bottom end of the valve stem through a transmission mechanism. The movable end of the spool set is arranged at the water outlet channel and cooperates with the valve seat. By using the separate spool, the inner spool moves relative to the outer spool to generate negative pressure in the adsorption chamber of the outer spool, and the impurities accumulated at the piston body are sucked into the outer spool, and the inner spool continues to move to drive the outer valve. When the core is detached from the valve seat, the flushing chamber of the outer valve core is passed into the liquid medium, and the liquid medium washes away the impurities in the adsorption chamber, thereby eliminating the damage of the impurities to the valve core.

Description

technical field [0001] The invention relates to the technical field of valves, in particular to an axial-flow single-seat valve with an automatic impurity removal valve seat. Background technique [0002] The opening and closing part of the single-seat valve is the valve core. The valve core of the single-seat valve moves linearly with the valve stem to open or close the gate. When the valve core is lifted and closed, the valve core is affected by the pressure of the fluid medium on one end surface. A large pressure will be generated on it, which needs to be resisted by the spool, and when the spool of the single-seat valve is lifted and opened, it is easy to generate eddy current phenomenon at the outlet flow channel, and the noise is large. [0003] Patent No. CN200810244539.6 discloses a single-seat regulating valve that can withstand a large pressure difference, including: a valve body, a valve cover and a valve stem. The valve body is provided with a valve cavity and a ...

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Problems solved by technology

[0004] Although the above-mentioned patents form a valve stem cavity between the valve stem, valve core and stuffing box, and a balance channel connecting the water inlet and the valve stem cavity is opened in the valve core, the disadvantage of small pressure difference of the valve core is reduced, but This invention still cannot solve the problem that when the spool of the single-seat valve is lifted and opened, impurities are easy to accumulate at the outlet channel and damage the spool

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