SU1114846A1 - Self-sealing disc valve - Google Patents

Abstract

A SELF-LAPPED DISK VALVE, comprising a body in which a seat and a locking and regulating body are located, permanently interacting with the seat and connected via a spindle to a discharge plunger installed in the chamber and forming its active surfaces with the internal surfaces of the cavity chamber, communicated with the drain and pressure parts of the pipeline, characterized in that, in order to increase durability and reduce drive power by creating an optimal force of pressing the valve y, a cutout is made in the shut-off and regulating organ, and in the saddle there is a groove and groove, whereby the groove in the closed position of the valve is connected to the pressure part of the pipeline, whereby the groove is made with an extended section, through which the notch in the shut-off and control organ the open position of the valve communicates with the drain part of the pipeline. (L

Description

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05 The invention relates to general engineering, in particular to regulating pipeline valves, and can be used in valves to control the high flow rates and pressure drops of a liquid or gaseous medium in various technological processes, for example, in thermal power plants to regulate the supply of water to steam boilers. A locking device is known, comprising a housing in which a saddle and a locking and regulating body are installed, which permanently interact with the saddle by means of a shaft with a pusher installed in an annular cavity made in the saddle 1. The disadvantages of this device are the complexity of construction, repair and increased wear when opening The closest to the invention in its technical essence and the achieved result is a self-sealing disc valve containing a body in which the seat and the locking and regulating body are constantly interacting with the seat and connected through the spindle with the discharge plunger installed in the chamber with forming its active surfaces with the internal surfaces of the cavity chamber, communicated with the drain and pressure parts of the pipeline 2. A disadvantage of the known valve is that, depending on the closure or the open position of the valve, the pressure of the valve is different (when the position is open, it is much smaller, when closed, it is more), and since the area of the active surface of the plunger for unloading is chosen from the condition of least effort, in order not to cause the valve to go off. organ from the seat, with the valve completely closing, the pressing force is much more optimal than that, which creates difficult conditions for the valve elements to open when it opens and leads to increased wear, i.e. reduces durability. In addition, the power consumption of the drive increases. The aim of the invention is to increase durability and reduce drive power by creating an optimal force to press the valve to the saddle. The goal is achieved by the fact that in a self-sealing disc valve, comprising a housing in which a saddle and a valve are located, which constantly interact with the saddle and are connected through the spindle with a discharge plunger installed in the chamber and forming its active surfaces with internal the cavity chamber surfaces, communicated with the drain and pressure parts of the pipeline, are cut in the shut-off and regulating body, and in the saddle there is an annular groove and a groove, through which the groove in the closed The valve position is communicated with the pressure part of the pipeline, the groove being made with a stretched section, 1 by means of which the groove in the open position of the valve is communicated with the drain part of the pipeline through a slot in the shut-off and regulating body. FIG. shows the proposed disc valve, longitudinal section; in fig. 2, section A-A in FIG. 1 (“Closed” position); in fig. 3 shows a section BB in FIG. 2; in fig. 4 shows a section B-B in FIG. i3; in fig. 5 shows section A-A in FIG. 1 (position "open"); in fig. b - section GG pa fig. 5; FIG. 7 is a section d-d in fig. 6; pas figs. 8 is a section E-E of FIG. 2; on (|) 9 shows a section of an Ж-Ж in FIG. 5. In the valve body 1, a fixed seat 2 and a valve body 3 permanently cooperating with it are installed. The valve seat 2 and the valve body 3 divide the pipeline into pressure 4 and drain 5 parts and have, respectively, bore holes 6 and cutouts 7 for skipping the working environment. The flat sealing surfaces of the seat 2 and the valve 3 are ground to each other. The shut-off and regulating body 3 is connected via spindle 8 with a discharge plunger 9 installed in chamber 10. Plunger 9 has two active surfaces 11 and 12, which form cavities 13 and 14, respectively, with internal surfaces of chamber 10. 15 with a drain part 5 of the pipeline, and a cavity 14 with a channel 16 with a pressure part 4. In the saddle 2 there is an annular groove 17, a groove 18 for communicating the groove 17 with the pressure part 4 of the pipeline and an extended section 19 in the annular groove 17 from its inner diameter . In the shut-off and regulating body 3, a slot 20 is made, which connects the lined section 19 of the annular groove 17 with the drain part 5 of the pipeline. Valve works as follows. An adjustable working medium under pressure PJ enters the pressure part 4 of the pipeline and through the channels formed when the holes 6 of the seat 2 coincide with the notches 7 of the shut-off and regulating body 3 enters the discharge part 5 of the pipeline. By turning the shut-off and regulating body 3 by means of pins 8 along its axis, the cross-sectional area of these channels is changed, thereby controlling the flow rate of the working medium. The differential pressure aP Pi-РЗ of the pressure and discharge parts of the pipeline, the locking control body 3 is pressed against the saddle 2, and the pressing force depends on the differential pressure LF, the area of the bore holes, the contact area

valve 3 with a saddle 2 and effort unloading Fpajpp.

The discharge force Fpajpp is determined by the differential pressure of the RR Rj. - P and areas of active surfaces 11 and 12 of the discharge plunger 9 and directed in the direction opposite to the direction of the force pressing the locking and regulating body 3 to the saddle 2. The unloading force Fpairp. it is received by plunger 9 and transmitted through the spindle 8 to the locking control body 3, reducing the force of pressing it against the saddle 2.

Since the pressing force Pp depends on the contact area of the valve 3 with the seat 2, and depending on the position of the valve Open or Closed, the pressure varies by a significant amount, the pressing force P, p changes from one position in, other. The choice of the areas of the active surfaces 11 and 12 of the discharge plunger 9 is carried out from the condition of the smallest pressing force Ffip of the valve 3 to the saddle 2, i.e. pressing force at the time of full opening of the valve, optimal Fnp, otherwise a shutoff of the control valve 3 from the seat 2 may occur. But in this case, in the closed position of the valve, the pressure of the lock valve 3 to the saddle 2 will be significantly greater than the optimum,

 in, ie-.oT ui soboi 1101 .. chp ||, 1i and .ch.ch- TJ details.1. and the growth of power priio. ;;..

To eliminate this in a bug. syyy; MOMeHt valve output from the closed Po.-K; Fifths of the rotation of the porn horns. Schrushayuschego organ 3, the groove 18 communicates the pressure part 4 of the pipeline with an annular groove 17. The working fluid inside it creates an additional unloading force unloading. acting directly on the shut-off regulator 3, reducing the pressure to press Fnp and bring it closer to the optimum. With further rotation of the valve 3 and opening the valve to half of the bore holes 6 groove

18 overlaps and the annular groove 17 is separated from the pressure part 4, and through the widened section 19 and the slot 20 communicates with the drain part 5 of the pipeline. As a result, the additional effort of unloading and in

when the valve is fully opened, it is equal to O, i.e. in both extreme positions, the pressing force Fpp is close to the optimum value.

Technical and economic efficiency lies in the fact that the proposed valve design creates the same working conditions when opening and closing its elements, eliminating their work with increased friction, and this, in turn, significantly improves their durability and reduces the valve drive power.

Fig-f

 Aa

one

7

V

5 B

FIG. 2

Phage.

3-6

/ 7

78

73

4

Phage. five

Dd

Fi-g6

17

18

Phage. 6

Phage. 7

17 j

20

FIG. 9

Claims (1)

SELF-SEALING DISK VALVE, comprising a housing in which a saddle and a locking-regulating body are located, constantly interacting with the saddle and connected through a spindle to a discharge plunger installed in the chamber and forming cavities connected with the drain and pressure parts of the pipeline with its active surfaces with the chamber inner surfaces , characterized in that, in order to increase durability and reduce drive power by creating optimal efforts to press the locking and regulating body to the saddle, the groove in the saddle-regulating body is made a slot, and in the saddle there is an annular groove and a groove, by means of which the groove in the closed position of the valve is in communication with the pressure part of the pipeline, the groove being made with an expanded section, through which the groove in the open position of the valve through the slot in the shut-off-regulating body communicated with the 9 drain part of the pipeline. 4 ^ QO 4 ^