Adjusting two-disk valve with an unloading arrangement

FIELD: the adjusting two-disk valve with an unloading arrangement is designed for using in the adjusting pipeline armature.

SUBSTANCE: in the body of the valve there is an immobile saddle with the passing profiled peripheral windows and a central channel in it and a slide. The valve is additionally provided with an analogous immobile saddle and a slide. The latter are installed symmetrically to the first saddle and the slide relatively to the axle of the sockets. The slides are connected between themselves with possibility of their simultaneous turn and possibility of an axle travel relatively to each other by means of the rods. The latter pass through the central channels of the immobile saddles. The unloading chamber is located between the immobile saddles and is formed with the help of a cylinder and a piston. The latter are located on the ends of the rods. The unloading chamber is connected with the pressure cavity of the valve by means of a longitudinal channel. The latter is fulfilled in the rod of one of the slides. Between the cylinder and the piston there is an element for preliminary compression of the slides to the saddles.

EFFECT: increases carrying capacity of the valve.

1 cl, 3 dwg

 

The invention relates to regulating valves, namely, devices that regulate the flow and cutting off the flow of liquid or gaseous media that are both at low and at high pressure, and can be used in the systems of heat, such as valves disc type on pipelines of thermal power plants.

Known floating disk valve, comprising a housing with a saddle, a spindle connected with flat swivel regulatory element located in the input cavity of the housing, and handling tool, made in one piece with the spindle, the area of cross-section of the shaft end receiving the input pressure is greater than or equal to the square of the regulatory element in the cross section (patent RU No. 2079028 C1, class F 16 K 39/04, op. 10.05.97 year).

A disadvantage of the known disk valve is that the bandwidth it directly depends on the size of the regulatory element. This is because the discharge means made in one piece with the spindle and to ensure that the efforts of the unloading valve cross-sectional area of the spindle in the area of the seal shall not be less than the cross-sectional area of the regulating element, which leads to a significant increase of the loads on the support site, increasing both the size of the spindle is a regulating element, and hence, the size and weight of the valve.

In addition, the performance of Windows in the saddle along the normal to the surface of the saddle and flat regulatory element leads to the formation of straight-line flow of the working fluid in the form of parallel jets coming under pressure from the pressure side of the pipeline, colliding with the force from the opposite surface of the drain cavity, which leads to the formation therein of erosion, and hence the wear of this surface.

Known regulatory disk valve with unloading device, which contains the set housing fixed saddle with bandwidth profiled peripheral Windows and a Central channel therein in contact with the spool, made with cutouts and connected with a spindle passing through the cover attached to the housing, a cylinder in which is situated a piston, narashima connected with the valve and forming with the latter the discharge chamber, communicated with the drain cavity, pie grooves on the sealing surface of the valve, forming together with the surface of the seat intermediate chamber is in communication with the Central channel of the saddle (patent RU No. 2099623 C1, class F 16 K 39/04, op. 20.12.97 year).

However, the throughput of the valve is limited to a maximum possible area of Windows in the saddle, which is less than 50% of the surface area of the saddle. In addition to the, this valve has a significant erosive wear of the flow area of the casing in the region of the outlet pipe due to execution of the Windows in the saddle along the normal to the surface of the saddle and flat regulatory element. Resulting in a rectilinear flow of the working fluid in the form of parallel jets coming under pressure in the discharge cavity of the pipeline and colliding with the force from the opposite surface of the drain cavity, resulting in the erosion and wear of this surface.

The technical result of the claimed invention is the improvement of the capacity of the valve and reducing the erosive wear of the outlet pipe casing through supply of additional valve seat with the valve.

To achieve the technical result in regulating the double-disc valve with unloading device containing within the enclosure fixed saddle with bandwidth profiled peripheral Windows and a Central channel therein in contact with the spool, made with cutouts and connected with a spindle passing through the cover attached to the housing, a cylinder in which is situated a piston, the discharge chamber, pie grooves on the sealing surface of the valve, forming together with the surface of the seat intermediate chamber communicated with the goals of the Central channel of the saddle, according to the invention, the valve is further provided with a similar stationary seat and a valve mounted symmetrically to the first saddle and the spool about the axis of the pipe, while the spools are connected with the possibility of their simultaneous rotation and for axial movement relative to each other by rods passing through the Central channels of the stationary seat, a discharge chamber, located between the fixed seat and is formed by a cylinder and a piston placed at the ends of the rods, and is in communication with the pressure cavity of the valve through the longitudinal passage in the shaft of one of the spools.

In addition, between the cylinder and the piston may be positioned element to preload spools to saddles.

The supply valve is additionally similar to a fixed seat with a valve installed symmetrically to the first saddle relative to the axis of the nozzle, provides an opportunity to ensure that the working environment at the same time from two sides relative to the valve seat, which increases the throughput of the valve almost doubled, without increasing its size.

The flow of the working medium passing through the window seats arranged symmetrically about the axis of the nozzle valve in the drain cavity directed towards each other, the cut is ltate which the mixing flow of the working medium takes place before as they reach the inner surface of the drain cavity. In the meeting place of the flows split into smaller, randomly oriented threads, and when reaching the inner surface of the drain cavity pressure environment weakens, causing the force of the blow flow on the inner surface of the drain cavity decreases, which reduces the erosive wear of this surface.

Connection spools together with the possibility of their simultaneous rotation by means of rods and their axial movement relative to each other provides pressure spools to saddles with a preset force, i.e. provides the estimated unloading spools and process flow control of the environment at the same time the two spools on both sides, which helps to increase the capacity of the valve.

The location of the discharge chamber formed by the cylinder and installed in it a piston placed at the ends of the rods, and also the camera position between the fixed seat and message her with the pressure cavity of the valve through the longitudinal passage in the shaft of one of the spools, provides unloading spools by the difference in surface areas spools and the piston surface with the same amount of pressure on these surfaces and the pressure differential between the pressure and the drain of the second cavities.

In addition, between the cylinder and the piston element, enabling them to interact with each other and preliminary preload spools to saddles in the absence of pressure in the valve body, increases the reliability of the valve and, therefore, provides the bandwidth.

The invention is illustrated by drawings, where:

figure 1 shows the described control valve, a longitudinal section;

figure 2 is a view As in figure 1, the valve in the closed position, in which the window seat is blocked by the spool;

figure 3 is a view As in figure 1, the valve in the open position, in which the cut spools combined with Windows saddles.

Regulating dual valve with unloading device includes a housing 1 (see figure 1), equipped with a pressure nozzles 2 and the drain 3 of the cavities. In the housing 1 is symmetrical relative to the axis of the nozzle valve has two fixed seat 4, and 5, each of which is placed a rotary disk valve 6 and 7 with cut-outs, respectively (see figure 2). Saddle 4 and 5 are equipped with carrying profiled peripheral Windows 8 (see figure 3) for the passage of the controlled environment and the Central channel 9. Windows 8 seats 4 and 5 and the slots in the spools 6 and 7 with their combination reported pressure 2 and the drain 3 of the body 1. The valves 6 and 7 are connected with the possibility of the simultaneous their rotation and for axial movement relative to each other by means of rods 10 and 11, respectively. The rods 10 and 11 pass through the Central channel 9 fixed seats 4 and 5. At the ends of the rods 10 and 11 between the fixed seat 4, and 5 are placed unloading chamber formed by the cylinder 12 and the installed piston 13. The piston 13 is connected to the cylinder 12, for example, by using mechanical teeth, which ensures synchronous rotation of the spools 6 and 7. Between the cylinder 12 and the piston 13 element is located, for example, the spring 14, which enable their interaction with each other and preliminary preload spools 6 and 7 to the valve seats 4 and 5. Unloading chamber communicated with the pressure cavity 2 of the valve through the longitudinal channel 15, made in one of the rods, for example in the stem 11 of the valve 7. The valve 6 is connected via a coupling 16 with the spindle 17, passing through the Central hole of the cover 18 mounted on the housing 1. The spindle 17 is used to transmit torque from the actuator (not shown) to the valve 6 in the regulatory process. The cross-sectional area of the piston 13 to ensure that the efforts of the discharge is determined on the basis that the force of the discharge, which is created by the difference in pressure between cavities 2 and 3, the valve does not exceed the efforts of the pressure spools 6 and 7 to the seat 4, and 5, respectively. Between each surface of the saddle 4 and 5 and the spool 6 and 7 formed intermediate chamber 19 and 20, respectively. Channels 9 seats 4 and connect the intermediate chamber 19 and 20 with drain cavity 3.

The valve works in the following way:

In the "closed" position (see figure 2) Windows 8 seats 4 and 5 is blocked by the spool 6 and 7. The spool is pressed against the seat by the pressure P1the working environment of the cavity 2. The working medium pressure in the intermediate chambers 19 and 20 is equal to the pressure P2in the drain cavity 3. The pressure of working medium in the cylinder bore 12 is equal to the pressure in the pressure cavity 2. The working environment is not supplied to the drain cavity. The valve is closed. The pressure difference (P1-R2in the pressure cavity 2 and the drain cavity 3, multiplied by the difference between the active areas of the spools 6 and 7 and the area of the piston 13, generates a force which presses the spool 6 and 7 to the valve seats 4 and 5 and provides unloading spools.

To bring the valve in the "open" position, the actuator rotates the spindle 17 and connected narashima with him through the clutch 16, the spool 6. Simultaneously with the valve 6 due to the rigid connection through the rods 10, 11, cylinder 12, the piston 13 is rotated and the spool 7. When the cut spools 6 and 7 are combined with Windows 8 seats 4 and 5 (see figure 3), there is formed a through passage, a pressure cavity 2 will be connected with the drain cavity 3. The working medium under pressure P1from the pressure cavity 2 of the housing 1 flows through the channels formed by the coincidence of Windows 8 in the seats 4 and 5 and cut spools 6 and 7, the drain cavity 3. The rotation of the spindle 17 change the angle regards the PTA spools 6 and 7, which, rotating, gradually open the Windows 8 seats 4. Thus, the change in the cross-sectional area of these channels, which ensures the regulation of fluid flow. Full opening of the valve is achieved with the full combination of Windows 8 with cutouts spools 6 and 7. Turning spools regulate the area of the bore of overlapping Windows.

To close the valve overlapping Windows 8 seats 4 and 5 occurs in the reverse sequence. The spindle motor 17 rotates the spools 6 and 7 so that they are located above the Windows 8 seats 4 and 5 and completely blocked them. The pressure of the working medium in the cavity of the cylinder 12 becomes equal to the pressure in the pressure cavity 2. The working environment is not supplied to the drain cavity. The valve is closed.

In the absence of pressure in the housing 1 of the valve spools 6 and 7 is pressed against the valve seats 4 and 5 by means of spring 14.

Thus, due to the presence of an additional seat with slide rigid connection between themselves and the location of the discharge chamber between the fixed seat allows you to double the throughput of the valve without increasing its dimensions, which greatly improves the operational readiness of the valve, increases its reliability and lasting performance in General by reducing the erosive wear of the surface SL the main cavity of the valve.

1. Regulating dual valve with unloading device containing within the enclosure fixed saddle with bandwidth profiled peripheral Windows and a Central channel therein in contact with the spool, made with cutouts and connected with a spindle passing through the cover attached to the housing, a cylinder in which is situated a piston, the discharge chamber, pie grooves on the sealing surface of the valve, forming together with the surface of the seat intermediate chamber is in communication with the Central channel of the saddle, wherein the valve is further provided with a similar stationary seat and a valve mounted symmetrically to the first saddle and the spool about the axis of the pipe, while the spools are connected with the possibility of their simultaneous rotation and for axial movement relative to each other by rods passing through the Central channels of the fixed seat, the discharge chamber is located between the fixed seat and is formed by a cylinder and a piston placed at the ends of the rods, and is in communication with the pressure cavity of the valve through the longitudinal passage in the shaft of one of the spools.

2. Regulating dual valve with unloading device according to claim 1, characterized in that between the cylinder and the piston element is located to preload spools to saddles.



 

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