A crack resistant valve plate assembly is provided for use in a slide gate valve. The valve plate assembly includes a refractory valve plate having an orifice positioned along its longitudinal center line, and truncated corners for focusing a clamping force toward the center line in the vicinity of the orifice to prevent the formation and spreading of cracks. The angular orientation of each of the truncated corners varies with respect to the position of the orifice along the longitudinal center line. Specifically, each of the truncated corners are orthogonal to a line extending from a point tangent with the orifice, across the center line, and through an intersection lines drawn parallel to the converging lengthwise and widthwise plate edges that is spaced from the edges a distance equal to one-half of the maximum diameter of orifice that the plate can effectively operate with.
The invention relates to a refractory plate (1) for a slide gate valve, having a pouring hole (3), circumscribed by a circle C of center (4), at least a portion of the edges (15, 16, 17, 18) of the plate (1) are angularly oriented so as to focus the clamping forces optimally in the throttling area and around the pouring hole.
The present invention relates to a slide valve for use in high pressure, high temperature, erosive environments. The slide valve includes a valve housing, a liner defining a flow passage within the valve housing through which a medium which contains fluidized iron oxide particles can pass, a stationary valve member fixed relative to the flow passage, and a valve member movable relative to the flow passage and to the stationary valve member for restricting and/or blocking flow through the flow passage. The movable valve member has an orifice therein and is movable between a first position wherein the orifice is aligned with the flow passage and a second position wherein the orifice is non-aligned with the flow passage. The valve is in a fully closed position when a solid portion of the movable valve member closes the flow passage. In a partially open or partially closed positions a solid portion of the movable valve member partially obstructs the flow passage.
The object of the present invention is a clamp for clamping device for a refractory plate in a seating of a slide valve in a casting installation, the said clamp having on one hand a thrust zone whereon it can receive a clamping force tending to push the clamp against a refractory plate located in the seating and, on the other hand, two ends of which each is capable of being applied against one edge of the refractory plate. The clamp is characterised in that it is capable of being elastically deformed in that each of its two ends is conformed such that it bears against the corresponding edge of the refractory plate when a clamping force is applied to the clamp also bears against the wall of the seating under the effect of expansion of the plate or a greater clamping force. One of the advantages of the clamp, and in that the clamp is also deformed such that the clamp according to the invention is that it adapts automatically to the geometry of the plate which it is required to immobilise, so that variations in shape between plates due to their fabrication process do not cause any clamping problems.
A gate valve includes a valve body having a cylindrical passage defining a flow path through the valve, a gate for controlling fluid flow through the valve and a replaceable wear-resistant flow-path liner for in the flow path. The flow-path liner includes a plurality of replaceable wear-resistant inserts, including wear sleeves lining ports of the valve body, valve seats and a gate insert for a flow path bore through the gate. Each replaceable valve seat has a wiper ring for cleaning the gate when it opens and closes. By regularly inspecting and replacing worn-out inserts, the service life of the gate valve can be prolonged and the expense associated with replacing or rebuilding the valve body is avoided.
A gate valve includes a valve body having a cylindrical passage defining a flow path through the valve, a gate for controlling fluid flow through the valve and a replaceable wear-resistant flow-path liner for in the flow path. The flow-path liner includes a plurality of replaceable wear-resistant inserts, including wear sleeves lining ports of the valve body, valve seats and a gate insert for a flow path bore through the gate. Each replaceable valve seat has a wiper ring for cleaning the gate when it opens and closes. By regularly inspecting and replacing worn-out inserts, the service life of the gate valve can be prolonged and the expense associated with replacing or rebuilding the valve body is avoided.
