초록 ▼

The control valve described is a three-position valve that has been designed for use in decoking operations. The hollow body of the valve has been fitted with a sleeve that includes: a plurality of apertures adjacent the inlet of the valve that are arranged in communication with a first outlet; a se

The control valve described is a three-position valve that has been designed for use in decoking operations. The hollow body of the valve has been fitted with a sleeve that includes: a plurality of apertures adjacent the inlet of the valve that are arranged in communication with a first outlet; a second plurality of apertures that are spaced from the first apertures and arranged to be in communication with the second outlet of the valve; and, a plurality of relatively large perforations that extend through the sleeve and are located between the two sets of apertures and in communication with the first outlet. An elongated valve member is movably located within the sleeve. The valve member has a passageway extending therethrough so that when the valve member is in a first position, the fluid communicates from the inlet to the second outlet of the valve providing restricted flow permitting the pump connected therewith to continue to recirculate the fluid utilized in decoking through the second set of apertures. In a second position of the valve member, the decoking fluid flows through the first apertures purging and filling the decoking lines and simultaneously flowing through the valve member outwardly through the second set of apertures for recirculation as required. In the third position of the valve member, the perforations in the sleeve are open and the second set of apertures are closed so that substantially unrestricted flow is provided through the perforations to the first outlt from the valve to provide the necessary volume and pressure to perform the decoking operation.

대표청구항 ▼

An improved flow control valve comprising: a hollow valve body having an inlet port and first and second outlet ports; sleeve means mounted in said body having an open end located adjacent said inlet port, a closed end located adjacent said second outlet port, a plurality of first apertures near sai

An improved flow control valve comprising: a hollow valve body having an inlet port and first and second outlet ports; sleeve means mounted in said body having an open end located adjacent said inlet port, a closed end located adjacent said second outlet port, a plurality of first apertures near said open end extending through said sleeve means and arranged to be, at times, in communication with said inlet port, a plurality of second apertures extending through said sleeve means and arranged to be, at times, in communication with said second outlet port, and a plurality of perforations extending therethrough adjacent said first outlet and between said first and second apertures; an annular valve seat in said body encircling said inlet port; an elongated valve member movably located in said sleeve, said valve member having a longitudinally extending passageway therethrough providing communication between the open and closed ends of said sleeve and being of sufficient length to close said perforations, said valve member being engageable with said valve seat to prevent flow from said inlet port to said first outlet port; valve operating means operably connected with said valve member for moving said valve Member to a first position in engagement with said seat wherein said first apertures and perforations are closed to flow and said second apertures are open permitting restricted flow from said inlet port to said second outlet port, to a second position wherein said first and second apertures are open permitting restricted flow from said inlet port to both said outlet ports while preventing flow through said perforations, and to a third position wherein said perforations are open and said second apertures are closed permitting substantially unrestricted flow from said inlet port through said perforations into said first outlet port while preventing flow through said second apertures into said second outlet port.