Gate valve with non-rising spindle

Abstract

FIELD: valve engineering.SUBSTANCE: invention can be used as a dual-function shut-off and control device primarily for large-diameter pipelines. A gate valve shut-off and control device with a non-rising spindle comprises a housing with inlet and outlet pipes, in which spring-loaded seats with sealing fields are installed, interacting with the mating fields of a flat gate valve. The damper has a central channel in which the threaded part of the spindle is located, interacting with the lead nut installed in the upper part of the channel, and the smooth part of the spindle is sealed in the central channel of the upper cover, equipped with a stand with a bearing assembly for fastening the spindle, the upper end of which is connected to the drive. When the device is closed, the lower end of the damper interacts with a stabilizer that is spring-loaded relative to the lower cover, which is hermetically connected to the body. The central vertical channel in the damper is made through. The seat in the outlet pipe is tightly installed. On the spindle above the seal cover there is an indicator with a reflector that interacts contactlessly once per revolution of the spindle with a phototachometer mounted on a bracket rigidly fixed to the cover posts.EFFECT: shut-off and control device of large diameters with minimized height parameters.2 cl, 4 dwg

Description

[0001] The invention relates to mechanical engineering, namely to valve engineering, and can be used as a two-functional shut-off and control device primarily for large-diameter pipelines.

[0002] A device is known, see RU 2506483 F 16K 3 / 312, containing a housing with inlet and outlet pipes with spring-loaded seats placed in them, constantly in contact with a damper controlled by a retractable spindle, the lower end of the damper interacts with a stabilizer controlled by a spring mechanism located in the lower cover of the housing.

[0003] A gate valve device is also known, see RU 2244862 F 16K 3 / 02, containing a housing with inlet and outlet pipes with spring-loaded seats placed in them, which are in constant contact with a long gate valve, controlled by a retractable spindle, sealed relative to a cover connected to the housing and equipped with a stand, in the upper part of which a running nut controlling the spindle is movably and rotary mounted.

[0004] The disadvantages of both devices include their large dimensions, due to the tall housing, the spindle sealing assembly, and the spindle extension, which is at least as long as the gate valve. Such height parameters for devices with nominal bores, such as 550 mm and above, require specific metal structures, including platforms for servicing during operation.

[0005] Also known is a gate valve type device (see RU 2240462 F16k 41 / 04) a prototype comprising a housing with inlet and outlet pipes with spring-loaded seats placed in them, interacting with a gate valve having a central internal channel in which a running nut is secured, interacting during the lifting of the gate valve with a non-retractable spindle with a sealed seal in the cover, on which a manual drive is installed rigidly connected to the spindle.

[0006] The disadvantage of this device is its one function - locking, that is, the lack of a function for regulating the working environment and the lack of a valve stroke indicator, which reduces its consumer properties.

[0007] The technical problem solved by the present invention is the creation of a shut-off and control device of large diameters with minimal height parameters.

[0008] The stated task is achieved in that a gate valve shut-off and control device with a non-rising spindle, comprising a housing with an inlet and outlet branch pipes, in which spring-loaded seats with sealing fields are installed, interacting with the mating fields of a flat gate valve, having a central channel, in which a threaded part of the spindle is located, interacting with a running nut installed in the upper part of the channel, and the smooth part of the spindle is sealed in the central channel of the upper cover, equipped with a rack with a bearing assembly for fastening the spindle, the upper end of which is connected to the drive, wherein the lower end of the gate valve, when closing the device, interacts with a stabilizer, spring-loaded relative to the lower cover, hermetically connected to the housing, wherein the central vertical channel in the gate valve is made through, and the seat in the outlet branch pipe is installed hermetically rigidly,on the spindle above the gland cover, an indicator with one or more reflectors is installed, which interacts contactlessly once per revolution of the spindle with a phototachometer mounted on a bracket rigidly fixed to the cover posts.

[0009] Fig. 1 shows a longitudinal section of the gate valve shut-off and control device. Fig. 2 shows a cross-section of the gate valve shut-off and control device. Fig. 3 shows reference I in Fig. 2. Fig. 4 shows a section along A-A in Fig. 3.

[0010] The gate valve shut-off and control device comprises a body 1 with an inlet pipe 2 and an outlet pipe 3. A seat 4 is installed in the inlet pipe 2, spring-loaded relative to the body 1, and a seat 5 is installed in the outlet pipe, rigidly and hermetically connected to the body 1, for example, by welding. The sealing fields of the seats 4 and 5 are in constant contact with the gate 6, which has a central vertical channel 7, in which a non-retractable spindle 6 is placed through a running nut 9, installed in the upper part of the channel 7 of the gate 6. The smooth part of the spindle 8 is sealed with a gland seal 10, placed in the upper cover 11, on the posts 12 of which a bearing unit 13 is located, closed by a cover 14. The end of the spindle 8 protruding from the cover 14 is made with an element 15 (for example, a square) for connection with a manual or electric drive placed above the cover of the gland 16.An indicator 17 with a reflector 17-1 is fixed to the spindle 8, which is contactlessly coupled with a phototachometer 18 secured to a bracket 19. In order to increase the accuracy of the working medium flow regulation, several reflectors 17-1 may be mounted on the indicator 17, which contactlessly interact with the phototachometer once per spindle revolution, thereby setting the required position of the gate valve. The lower end of the gate valve 6, when closed, interacts with a stabilizer 20, which is spring-loaded relative to a lower cover 21 connected to the housing 1; the shoulders of the stabilizer 22, when the gate valve 6 is raised, contact the grooves 23 of the seats 4 and 5.

[0011] Operation of a gate valve with a non-rising spindle in the locking mode (function)

[0012] When the gate valve 6 is raised, the running nut 9 contacts the cover 11. By turning the hand drive (the flywheel is not shown in the figure) clockwise, the gate valve 6 is lowered downwards until the stabilizer 20 touches the bottom of the lower cover 21. Under the action of the pressure of the working medium and the spring-loaded seat 4 installed in the inlet pipe 2 of the body 1, the gate valve 6 fits tightly against the sealing field of the seat 5 fixed in the outlet pipe 3 of the body 1, sealing the valve. The device is closed. In this case, the phototachometer 18 shows the mark "0" and transmits it to the remote control station (screen).

[0013] The device is opened in reverse order, by turning the drive counterclockwise. The spindle speed is displayed on the control screen. The device shutter is open.

[0014] Operation of a gate valve with a non-rising spindle in the control mode (function)

[0015] Flow control of the working fluid typically begins with the damper in the closed position. The phototachometer and control screen read "0" as the spindle speed.

[0016] By rotating spindle 8 counterclockwise, gate 6 rises together with spring-loaded stabilizer 20 until shoulders 22 touch grooves 23 in saddles 4 and 5. The number of revolutions of spindle 8 will appear on the control screen.

[0017] From this moment on, the process of regulating the working environment begins.

[0018] Knowing the thread pitch of spindle 8 and the diameter of the passage channel of seats 4 and 5, it is not difficult to determine the stroke of the valve, and therefore the required throughput depending on the number of spindle revolutions.

[0019] The operator, controlling the drive either manually or remotely, sets the required number of spindle revolutions 8 on the control screen to obtain the required throughput.

[0020] When the gate valve 8 is fully raised, the device is fully bore, and the spindle 8 occupies the entire internal space of the channel 7 of the gate valve along its entire length.

[0021] Thus, due to the fact that the vertical channel in the gate valve is made through, which ensured that the threaded part of the spindle could be completely accommodated with smaller dimensions of the gate valve, and the absence of a retractable part of the spindle made it possible to place a travel indicator of the gate valve between the gland and the drive and control it to obtain the required throughput capacity remotely, using a phototachometer, this is especially important for production, for example, in closed areas of nuclear power plants.

[0022] All this together certainly reduces the overall dimensions of the shut-off and control device with a non-rising spindle and improves its consumer properties.

Claims

1. A gate valve shut-off and control device with a non-rising spindle, comprising a housing with an inlet and outlet branch pipes, in which spring-loaded seats with sealing fields are installed, interacting with the mating fields of a flat gate valve, having a central channel, in which a threaded part of the spindle is located, interacting with a running nut installed in the upper part of the channel, and the smooth part of the spindle is sealed in the central channel of the upper cover, equipped with a rack with a bearing assembly for fastening the spindle, the upper end of which is connected to the drive, wherein the lower end of the gate valve, when closing the device, interacts with a stabilizer, spring-loaded relative to the lower cover, hermetically connected to the housing, characterized in that the central vertical channel in the gate valve is made through, and the seat in the outlet branch pipe is installed hermetically rigidly, an indicator with reflector,non-contacting interaction once per revolution of the spindle with a phototachometer mounted on a bracket rigidly fixed to the lid posts, 2. A gate valve shut-off and control device with a non-rising spindle according to claim 1, characterized in that several reflectors are installed on the indicator, which interact contactlessly once per revolution of the spindle with a phototachometer mounted on a bracket rigidly fixed to the lid posts.

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