RU2342579C2 - Sliding shutter - Google Patents

Abstract

FIELD: construction, conduit.

SUBSTANCE: invention pertains to pipe fitting and is intended for usage in pipelines transporting viscous working media. Sliding shutter contains a body frame with a passing channel for the working medium and under shutter space, lift gate with a through opening and front sealing faces, packing saddles, elastic packing rings and guides for the gate. Guiding plates are made integral with the packing saddles and are equipped with sealing faces for the gate. Elastic packing rings are placed on the gate. Additional packing rings are arranged on the periphery of the front sealing faces of the gate. The latter ones isolate from the flow part of the body frame under gate space along the entire length of the gate. Invention increases maintainability and ecological safety of the sliding shutter.

EFFECT: enhanced maintainability and ecological safety of the sliding shutter.

7 dwg

Description

The invention relates to pipe fittings intended for use on pipelines transporting viscous fluids.

Viscous fluids have a high pour point, which creates big problems when transporting them through pipelines. Direct-flow valves used on pipelines have a flow part made in the form of a pipe segment with a small coefficient of local hydraulic resistance. Along with this, the gate valve bodies contain a cavity in which the gate is located in its lowermost position. Viscous products transported through the pipeline, getting into this cavity and not having the possibility of further advancement through the pipeline, stagnate in it and harden, preventing the working movement of the gate.

Known gate valve, protected by German patent DE 4310124, IPC (2006) F16K 3/18; F16K 3/02, publication date - 09/29/1994. To prevent the ingress of the working medium into the internal cavity of the valve body, the sealing surfaces of the gate are equipped with hermetically welded thin sheet overlays-membranes. The containers formed by the membranes at the gate surfaces can be loaded with a pressure corresponding to the pressure of the working medium in the valve. Membranes are subjected to elastic deformation under the influence of pressure, due to which the casing space of the body is cut off from the flow cavity of the latter.

The disadvantages of the analogue are its high complexity, low manufacturability, maintainability and performance, due to the complexity of creating a metal seal using a metal membrane between the flow cavity of the body and its contiguous space. Metal membranes, being loaded from the inside with pressure, do not provide a flatness of fit to the body over its entire sealing surface, and also excessively wear these sealing surfaces due to their rigidity. To supply the working pressure to the submembrane tanks, the latter must be in communication with the flow part of the valve, which significantly reduces the overall tightness of the valve.

Known gate valve, protected by German patent DE 972087, IPC (2006) F16K 3/02; F16K 3/316, publication date 05/21/1959. The prototype gate valve comprises a housing with a through channel for the passage of the working medium, stationary sealing seats for the lifting gate made in the housing and an elastic seal installed in the grooves of the housing. The elastic seal is made in the form of an elastic ring of complex configuration, designed to simultaneously seal both the gate valve and the internal cavity of the housing from the ingress of the working medium.

The disadvantage of the analogue is its low maintainability and environmental safety, since in the event of wear of the valve elements, it is necessary to remove the valve from the pipeline in the field, which is accompanied by the discharge of the working medium into the surrounding space.

The prototype of the claimed device is a gate valve, protected by patent US 4281819, F16K 3/02, 08/04/1981. The prototype comprises a housing with a passageway for the working medium and under-head space, a lifting gate with a through passage and end sealing surfaces, sealing seats, elastic sealing rings and guide plates for the gate. The under-head space is communicated with the flowing part of the body through holes in the guide plates. The working medium that has got into the bogie space is discharged into the surrounding atmosphere through an opening in the bottom of the housing.

The disadvantage of the prototype is its low environmental safety when operating on oil pipelines.

The claimed invention solves the technical problem of improving the environmental safety of the slide gate valve.

The stated technical problem was achieved in a slide gate valve, comprising a housing with a passageway for the working medium and under-head space, a lifting gate with a through passage and end sealing surfaces, sealing seats, elastic sealing rings and guide plates for the gate. The guide plates are made integral with the sealing seats and are equipped with sealing surfaces for the gate, elastic sealing rings are located on the gate, while additional elastic sealing rings are installed on the periphery of the end sealing surfaces of the gate, isolating the under-cuff space from the flow part of the casing throughout the entire course of the gate.

The invention is illustrated by drawings, where

figure 1 shows a slide gate valve, a longitudinal section;

figure 2 is a view a of figure 1;

figure 3 is a view B of figure 1;

figure 4 is a view In figure 1;

figure 5 is a section along G-D of figure 2;

in Fig.6 - element D in Fig.5 without elastic sealing rings;

in Fig.7 - element D in Fig.5 with elastic sealing rings.

The gate valve comprises a housing 1 with a passage channel 2 for the working medium and a chipper space 3, elastic-rigid sealing seats 4 and 5 installed in the housing, a lifting gate 7 connected to the drive rod 6. The sealing seats 4 and 5 are provided with guide plates 8 and 9, on which the sealing surfaces 10 and 11 for the gate 7. are made. The gate 7 is provided with a through hole 12 for the working medium, end sealing surfaces 13 and 14, forming a shutter with the sealing surfaces 10 and 11. The gate 7 is made integral and includes the body of the gate 15, in which circumferential grooves 16 and 17 are made for elastic sealing rings 18 and 19 along the periphery of the end surfaces, and removable fasteners 20 and 21 for elastic rings 18 and 19. On the end sealing surfaces 13 and 14 of the gate 7 along the periphery of the through-passage bore 12, elastic sealing rings 22 and 23 are installed. Stiffeners 24 and 25 are made on the seats 4 and 5. Rigid adjusting stops 26 are installed in the housing 1 for pressing the seats 4 and 5 to the gate 7 and the elastic elements 27 dl I sealing the housing 1, as well as the elastic elements 28 for pressing the seats 4 and 5 to the gate 7. The body of the gate 15 includes parts 29, 30, 31 and 32.

Gate valve works as follows.

At the beginning of the closing of the slide gate valve, the slide gate 7 moves upward along the guide plates 8 and 9, sliding along their sealing surfaces 10 and 11. The working medium located in the cavity of the through passage 12 of the gate 7 and not falling into the discharge pipe (not shown), also attracted upward due to the presence of elastic sealing rings 18 and 19, also sliding on the sealing surfaces 10 and 11 of the guide plates 8 and 9. The ratio of the sizes of the elements of the slide gate is such that both end seals The entire surfaces 13 and 14 of the gate 7 throughout the entire course of the gate are in contact with the sealing surfaces 10 and 11. In the upper working position of the gate 7, the remaining working medium is held by the sealing elements of the shutter in a closed space formed by the sealing surfaces 10 and 11, 13 and 14, the cavity of the through-passage bore 12 of the gate 7, as well as elastic sealing rings 18 and 19. Due to this, the sealing of the under-casing space 3 is provided in any working position of the gate 7.

The exact location and rigidity of the guide plates 8 and 9 is ensured by preloading them using the adjusting stops 26 installed in the housing 1 and interacting with the stiffening ribs 24 and 25 of the seats 4 and 5. The adjusting stops 26 along with the elastic elements 28 provide a constant tight fit of the sealing surfaces 10 and 11 to the sealing surfaces 13 and 14 of the gate 7.

After the gate valve is opened, the working medium located in the cavity of the passage opening 12 of the gate 7 is washed out by the working medium into the discharge pipe.

In case of wear of the shutter elements (sealing surfaces 10, 11, 13, 14, elastic sealing rings 18, 19, 22, 23), the gate 7 in the assembly, the seats 4 and 5 are alternately removed from the gate valve body 1 and the worn parts are replaced with components and nodes without removing the valve body from the pipeline. The interchangeability of the gate elements ensures maintainability of the slide gate valve in the field without environmental pollution.

Claims (1)

Gate valve, comprising a housing with a passageway for the working medium and sub-gate space, a lifting gate with a through passage and end sealing surfaces, sealing seats, elastic sealing rings and guides for the gate, characterized in that the guide plates are integral with the sealing seats and provided sealing surfaces for the gate, elastic sealing rings are located on the gate, while on the periphery of the end sealing surfaces w Bera installed additional elastic sealing rings, insulating podshibernoe space from the flow of the body throughout the course of gate.

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