RU1798574C - Shut-off gate valve - Google Patents

Abstract

Use: to shut off the flue gas flow. SUMMARY OF THE INVENTION: Inside a housing with a flowing part, a slide is arranged vertically movable by means of a lifting device with flexible rods made in the side sinuses of the housing. One of the ends of the bellows-type sealing system is attached to the end-face sealing system with pressing springs and pressing actuators according to the number of springs, the other to the body. The gate is made of two halves, each of which is attached to the opposite ends of the same wires with the formation of a kinematic pair with an oppositely directed movement. In the lateral sinuses of the body along the slide, on two sides of each sinus, rails are reinforced. On each half of the gate from two sides corresponding to the rails of the side, the roller bearings are pivotally attached. The bellows-type sealing system is installed outside the flow passage. Another sealing system is made on each half of the gate from two sides, 5 silt. (L C

Description

The invention relates to shutoff valves and can be used to shut off the flow of flue gases passing through large diameter pipelines in a desulphurization plant for thermal power plants.

: The aim of the invention is to increase reliability and reduce energy consumption by reducing the resistance to movement of the gate .;

Figure 1 shows a longitudinal section of the valve along the axis of the flow; figure 2,3 is a cross section of a valve; in Fig.5.5 is a longitudinal section across the axis of the stream. Moreover, in FIGS. 1,2 and 4, the valve is shown in the closed position, in FIG. 3 and 5 in the open position ..;

The valve comprises a housing 1. On both sides of the opening of the housing, flow parts 2 and 3 are fastened. With locking seal systems

organs - the gate of the upper 4 and the gate of the lower 5, which are located in the internal cavities of the casing and close the openings of the flowing parts with the valve closed and move to the upper and lower ducts of the casing with the valve open. Rails 6 are installed on the side axles of the casing on both sides, which the roller bearings 7 are pivotally attached to the sliders. A cover 8 with drive sprockets 9 and a drive mechanism 21 is mounted on the upper flange of the housing 1. Slide rails 4 and 5 are attached to opposite ends of the same flexible t - load chains 10 thrown through the drive sprockets 9, thereby forming a kinematic pair with opposite directional movement. The sprockets rotate in opposite directions and, when the valve opens, the upper gate 4 moves from the middle

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the opening of the housing is up, and the lower gate 5 is down. When closing the valve, the movement of the gates is the opposite. The masses of gates with this system are mutually compensated - they are hung out by a chain link,

The sealing system of the locking elements is made on both sides in the form of movable frames 11 having two ducts with elastic end seals 12 located around the flow parts. The frames are connected to the body of the flowing part by drives 13 (pneumatic or electromagnetic) and have two rollers 14, with the help of which they move along the brackets 15.

Between the drive housings and the frame, precompressed springs 16 are located which pressurize the movable frames to the gates when the flow portions of the valve are closed, or press the movable frames to each other when 1 flow portions of the valve are open. The frame boxes are sealed with respect to the flow parts by a bellows type sealing system 17 mounted outside the flow part. In order to prevent solid inclusions from the gas stream from entering the duct sealing system, protective annular visors 18 are made, and an additional annular protective visor 19 is mounted coaxially inside the first visor 18 to the outlet end of the flow part upstream of the gate.

100% tightness of the valve in the closed position is achieved by supplying locking air with a pressure greater than the pressure in the blocked duct to the internal cavity of the housing through the nozzle 20.

The movement of the sliders 4 and 5 when opening or closing the valve is carried out only after turning on the actuators 13, which press the movable frames from the sliders or from each other and form a gap between the movable frame seals and the sliders: -; . :. /.

Shutter gate valve operates as follows.

To open the valve, compressed air is supplied to the pneumatic actuator 13 (in the case of an electromagnetic actuator, an electrical impulse), while the movable frames 11 with the mechanical seals 12 are pulled away from the gates, after which the actuator 21 of the sprockets 9 is turned on. the gate into the upper cavity of the housing, and the lower 5 into the lower cavity. The movement of the gate occurs using roller bearings 7, moving along the rails 6. After removal

the pressure (or electrical pulse) from the actuators 13, the frames 1-1 are pressed against each other by the seals 12 under the action of the springs 16 (see Fig. 3). The valve closes in the reverse order of opening. The execution of the gate of two halves connected by chain links in a kinematic pair with an oppositely directed movement and mutual compensation of masses, as well as the use of roller bearings, articulated

connected to the halves of the gate allows to significantly reduce the effort expended when opening and closing the valve, and accordingly to reduce the cost of electricity. The location of the sealing systems outside the flow part significantly reduces the degree of wear of the seals. The use of protective visors prevents solid flue gas from entering the seal systems. All this significantly increases the reliability of the entire system.

Claims (1)

SUMMARY OF THE INVENTION A shut-off gate valve for large-diameter pipelines, comprising a housing with a flow part, inside of which is vertically movable by means of a lifting device with flexible rods made in the housing sinuses, a gate, an axial axially displaceable sealing system with pressing springs and pressing actuators according to the number of springs, as well as a bellows-type sealing system, one of the ends of which is attached to the end sealing system, and the other to the housing, about t l and often with the fact that the gate is made of two halves, each of which is attached to opposite ends of the same rods with the formation of a kinematic pair with opposite directional movement, in the side sinuses during the movement of the gate with two rails are reinforced on the sides of each sinus, on each half of the gate, from two sides of the rails corresponding to the rails are the roll supports, the bellows-type sealing system installed outside the flow part, and the end sealing system is made on each half of the gate from two sides. : Ј:. Щ.  / 6G pnnehioi unanimously about HDUDUX  Wv W.986il  vr the valve is closed, the position is slammed from the open position Yal A 9 g AND 1Q L it an hour / 3 x And in Jo thirteen 4 l-for I well Jt d5 Yu I Jl S h