초록 ▼

A valve which conditions steam from a relatively high pressure source, by simultaneously reducing the steam pressure and temperature to the level desired for a particular steam utilizing application. The steam conditioning valve allows the amount of steam flow to be adjusted over a wide range, and s

A valve which conditions steam from a relatively high pressure source, by simultaneously reducing the steam pressure and temperature to the level desired for a particular steam utilizing application. The steam conditioning valve allows the amount of steam flow to be adjusted over a wide range, and simultaneously adjusts the amount of desuperheating liquid in direct proportion to the selected steam flow. Steam flow control is accomplished by passing the steam through an array of orifices in a fixed sleeve mounted in a valve body. A piston is movable within the sleeve to selectably cover or uncover the orifices as desired to regulate the amount of steam flowing therethrough. Steam flowing through the uncovered orifices enters a throat region where the steam accelerates and is subjected to a flow of desuperheating liquid; this liquid flows through a passage concentric with the steam flow control piston, and the amount of liquid flow is controlled by the reciprocal position of the piston assembly. The regulated flow of steam may optionally pass through orifices in one or more concentric steam diffusers to reduce the steam pressure in stages maintaining a subcritical velocity.

대표청구항 ▼

A steam conditioning valve for adjusting a flow of steam and introducing a selectable flow of desuperheating water to the steam, comprising: a valve body having an interior wall defining a hollow interior region extending within the valve body along a longitudinal axis; said interior region having a

A steam conditioning valve for adjusting a flow of steam and introducing a selectable flow of desuperheating water to the steam, comprising: a valve body having an interior wall defining a hollow interior region extending within the valve body along a longitudinal axis; said interior region having a first end opening and a second end opening aligned on the longitudinal axis; a steam inlet opening in said valve body for connection to a source of steam and interrupting a side of said interior wall to admit steam into said interior region intermediate said first and second end openings; said valve body having an outlet throat region communicating with the interior region at one end opening; a hollow stationary sleeve located in the interior region of the valve body, said sleeve having a cylindrical inner surface axially aligned with the longitudinal axis within the valve body; said sleeve having an outer surface spaced apart from the interior wall defining the interior region of the valve body, the sleeve defining an annular space between the sleeve and the interior wall, the annular space surrounding the sleeve and communicating with the steam inlet opening to admit steam to the outer surface of the sleeve; said sleeve having first and second ends respectively engaging the first and second openings of the interior region and isolating the annular space, and thus the steam inlet opening, from said outlet throat region; a plurality of steam flow orifices extending through said hollow sleeve and arrayed along the longitudinal axis of the sleeve, the steam flow orifices allowing steam to enter the sleeve from the annular space and the steam inlet opening; a steam control valve slidably disposed within the hollow sleeve and operable from outside the valve body for axial movement between first and secondpositions within the sleeve along the longitudinal axis; the steam control valve including a blocking member having an end proximal to the outlet throat region and having a blocking surface in close sliding relation with the cylindrical inner surface of the hollow sleeve to block all the steam flow orifices when the steam control valve is at said first position, thereby preventing steam flow through the sleeve; the blocking surface configured to progressively unblock the steam flow orifices arrayed along the sleeve as the steam control valve moves from said first position toward said second position, thereby allowing a progressively greater amount of steam flow from the steam inlet opening to enter the outlet throat region through the hollow sleeve; said steam control valve further including a stem coaxial with said blocking member, the stem longitudinally extending to first and second end portions beyond the ends of the blocking member; a water flow passage extending within the stem; one end portion of the stem extending into the outlet throat region of the steam conditioning valve and having water spray orifices communicating with the water flow passage in the stem; means defining a liquid receiving chamber on the valve body in coaxial alignment with said longitudinal axis; a water inlet opening into said liquid receiving chamber for connection to a source of water; said other end portion of the stem extending in the liquid receiving chamber for reciprocal movement therein as the steam control valve moves between first and second positions; a plurality of water flow orifices extending through the other end portion of the stem into communication with the liquid receiving chamber and communicating with the water flow passage in the stem; the water flow orifices being longitudinally arranged along the other portion of the stem, in relation to the liquid receiving chamber, to lie outside the liquid receiving chamber when the steam control valve is at said first position, so that no water enters the water flow passage in the stem; and the water flow orifices being longitudinally arranged for progressive entry into the liquid receiving chamber as the steam control valve moves from the first to second positions, so that water is admitted to the outlet throat region through the water spray orifices for desuperheating the steam therein, in proportion to the amount of steam entering the throat region through the hollow sleeve.