In many cases of valve repair, the liquid seal valve repair maintenance category are special valves Oulei Si valve repair factory in Jiangyin to introduce you to: the structural characteristics of the new single valve plate multi-process liquid seal valve, the valve through the valve plate a combination of independent liquid seal chamber can be provided in the closure of the valve plate to the independent liquid seal chamber injection fluid, forming a reliable blocking means, so as to avoid pumping blind plate blocking operation, which is a liquid seal of the special features of the valve.
Overview of the liquid seal valves
? Reliable cut off gas piped airflow usually blind plate sealing butterfly valve or gate valve, flapper, eyes, valves, and one of the fan-shaped valve combination to cut off device, or dual-board shut-off valve as isolation device. This paper describes a multi-process liquid seal new single valve plate valve shut-off valve to replace the eye valve, fan-shaped valves and dual plate.
Analysis of liquid seal valve
? Modular partition device used between the body flange or pipe flange rigid blocking plate, insert or extract rigid blocking plate must be used manually or mechanically loosen - clamping seal pair, medium cut off. After the pipeline is put into use, sealing butterfly valve, gate valve or flapper valve seat may sediments affect the sealing of the valve plate, vice between the valve seat when the valve is closed tight fit. Thus, pumping blocking blind board operation, or opening and closing the eyes valve or fan-shaped valve will be harmful gases to escape, causing the operating strength, high risk. In addition, the sealing parts of the modular partition means, the mechanical structure is complicated.
? Dual-board cut off valve cut off after the pipeline is put into use, the device seat may have sediments affect the sealing of the valve plate, vice between the valve seat when the valve is closed tight fit, by continuously from both sides of the valve plate and valve cavity formed injection fluid, to ensure that the sealing deputy division of the liquid static pressure is greater than the pressure of the gaseous medium, thereby to ensure that the gas medium does not leak to the side of the partition. The dual-board cut valve manufacturing difficult, especially the two valve plate concentric assembly precision grinding and sealing surfaces. Valve two valve plate by link transmission mechanism synchronization flip or lift a single block of failure affecting the the valve valve plate opening and closing, thereby increasing the workload of valve repair.
? In order to overcome the shortcomings of modular and dual-board cut-cut off device exists, the design of a multi-process liquid seal new single valve plate valve (referred to as liquid seal valve, the same below), the valve has applied for national invention patent (Application No. 2009103037153) .
? Liquid seal valve works
? Liquid seal valve consists of the valve body, the valve plate, the valve seat, the transmission mechanism of the valve plate, the upper partition and the upper separator drive mechanism (Figure 1). Independent of the liquid seal chamber is provided in the valve body to each other by the upper partition and the valve body under the floor nested composition. On the separator is inverted cup-shaped, the overall vertically directional movement, the upper partition is provided with an annular multilayer separator. A lower bottom plate of the valve body is cup-shaped, fixed does not move, under the bottom plate is also provided on the annular multilayered separator.
? Valve is closed, the first to close the valve plate, and then on a separator driven by the drive mechanism, so that the annular upper spacer multilayered separator downward movement by the upper insert the next on the floor of an annular between the multilayered separator, separator multilayer partition and on the floor below the ring, the ring multilayered separator nested within each other to form a multi-process liquid seal cavity. Open a valve, by observing whether relief port / liquid seal relief valve to the atmosphere after the height of the viewport diffuse gas medium continuous escape, to determine whether the valve seat and the valve plate sealing vice snug fit. Sealing of the valve seat and valve plate Vice unable snug fit, and then open the liquid injection valve to the liquid seal Intrathoracic fluid, bring the liquid along the inside annular partition overflow to the outside, until the liquid from relief port / liquid seal , to stop pouring the height observation mouth overflow. The height of the liquid seal liquid seal cavity to ensure the gas medium does not leak into the side of the partition.
? Open the valve, the first discharge valve to open the valve at the liquid discharge port, the liquid within the lumen of the liquid seal Cheng drained and then turn off the discharge valve, and subsequently closing the diffusing port / liquid seal height observed the valve in the mouth. Then driven by the transmission mechanism on the upper portion of the separator to move the valve body, so that the annular upper spacer multilayered separator is formed under the floor of the annular multilayered separator separated from the nested structure, the valve body can become smooth gas The flow channel, and finally to open the valve plate.
(A) valve open state (b) the valve closed state.
? 1. 2. Valve body 3 of the valve plate. Upper spacer drive means 4 on the partition plate 5 of the transmission mechanism of the valve plate 6 Seat
? A-gas inlet B-Note D-gas outlet of the liquid supply port C-level gauge port E-elution port, a liquid seal height viewport Fn-liquid discharge port
? Liquid seal valve structure design
? Depending on the design and installation requirements, liquid seal valve vertical, horizontal and horizontal - vertical structure. Corresponding to the vertical section, the horizontal section installed in the pipeline, and turning segments. The vertical-type gas inlet height direction of the axis of the subject, the axis of the gas outlet of the height direction can be adjusted according to the installation of the actual demand, i.e., in the practical applications, can save on the pipe 1 to 2 elbow. The horizontal type subject to the axis of the gas inlet in the horizontal direction of the axis of the horizontal direction of the gas outlet may be disposed anywhere within the range of ± 90 °. Horizontal - vertical type in the horizontal direction of the gas inlet / outlet horizontal axis may be anywhere within the range of ± 180 °, are arranged in the horizontal direction of the gas inlet / outlet height can be adjusted according to the installation of the actual demand, the practical application, can also be saved pipeline 1 to 2 elbow.
? Set gas flows, liquid seal chamber is arranged in the valve plate. The valve body in any one gas flow path cross-sectional area not less than the pipe cross-sectional area. Since the liquid seal chamber is to be vertically separated nested structure, the flow path is not the valve opening of the gas valve is closed after the liquid seal cavity when the normal gas flow passage, so that the valve body sizes greatly reduced.
? The number of passes of the liquid seal chamber may be any number of processes, usually from 2 to 6 process. On the partition plate and the lower base plate corresponding to the upper annular multilayered separator for any multilayer, typically 2 to 6 layers of separators. The liquid seal cavity design effective liquid seal height corresponding to different gas medium specification must comply with the requirements specified. To gas, for example, must comply with the GB 6222 - 2005 for effective liquid seal height requirements, the effective height of the liquid seal gas calculated pressure plus at least 5 000 Pa. Multi-process design of the liquid seal chamber, the actual pour height
Where Hi --- the actual height of the liquid injection, mm
? Hs --- effective height of the liquid seal (ie gas calculation pressure of at least plus 5 000Pa / liquid seal liquid density), mm
The? N --- multi-process liquid seal valve drive number
? S --- on the nesting of the separator with the lower floor, the gap between the lower edge of the upper partition and the lower base plate, mm
The vertical-type (a) (b) horizontal type (c) horizontal - vertical type
Single valve plate of different types of multi-way fluid valve closure
? Multi-process liquid seal greatly reduced so that the actual height of the injection fluid, highly effective liquid seal premise, reducing the quality of the operation of the valve. Optional liquid sealing fluid should be chemically stable at room temperature and under atmospheric pressure, non-volatile or low-volatile liquid not be cut off the base material of the gaseous medium and the liquid seal chamber reacts, and should have a better flame retardancy. Common liquid seal liquid water and fluorine oil. Fluorine oil such as the selection of a higher density, the volume of the valve can be further reduced.
? Liquid seal valve body wall thickness not less than the corresponding installation of the pipe wall thickness. The material of the valve body of the material with the corresponding mounting conduit to the same or better than the material of the pipe. Since the liquid seal cavity design in the valve body, repair or replacement is not convenient, therefore, constitute a liquid seal cavity parts of the central tube, partitions and other parts of the material have to be better than the material of the valve body, such as the use of 304, 316 or 316L stainless steel, the thickness of the various components must be greater than the body wall thickness.
? Liquid seal valves Summary:
? Liquid seal valve is used to cut off the gas piped gas stream has a lot of features.
? ① using the separate liquid seal chamber, avoiding the use of the process, a sediment from the seat obstructs brought close fit between the vice and the valve seat of the valve plate sealing the gas leakage of the medium impact.
? (2) in the liquid seal chamber using the design of the nested structure to be vertically separated to form a multi-process liquid seal, in a smaller space, to ensure a sufficient height of the liquid seal, reducing the valve sizes, reducing the quality of the valve itself and the operation quality.
? ③ valve is suitable for installation in different parts of the pipeline, such as the horizontal segment of the vertical segment or elbow, to meet the demand for design and installation, particularly suitable for large diameter gas pipeline, as well as in the small space layout applications.
? ④ mechanical structure is simple, the manufacturing cost is reduced.
? ⑤ run low failure rate, repair and maintenance is simple and convenient.
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