SU1204824A1 - Controllable check valve - Google Patents

Description

The invention relates to mechanical engineering, in particular to hydraulic shut-off bodies installed in hydraulic systems of mine mechanized roof supports.

The purpose of the invention is to expand the functionality by providing work from different sources.

The drawing shows a controlled check valve, a slit.

The controlled check valve includes a housing 1, in the central bore of which a saddle 2 is installed, a shutter 3 with a seal 4 separating the cavities of high 5 and low 6 pressure.

On the side of the high pressure cavity 5, the end of the shutter 3 is covered by a safety sleeve 7, which is pressed by the spring 8 to the Topiiy of the seat 2.

On the side of the low pressure cavity 6, there is a discharge piston 9, in the through hole of which another discharge piston 10 is installed with a seal 11, which with its ends rests on one side against the end 12 of the shutter 3, and on the other - on the end 13 of the additional discharge piston 14 installed in the bore of the nozzle 15.

The end 13 of the additional discharge piston 14 and the end 16 of the discharge piston 9 form an insulating chamber 17. On the side of the low pressure cavity, there is also a spring 18 designed to return the discharge pistons to their original position.

The fitting 15 has a working channel 19 for applying pressure to the end 20 of the additional piston 14.

In case 1, there is a working channel 2, through which the working fluid is supplied, and a working channel 22 to which the consumer is connected (the nopiii is not a hydrostatic cavity, is not shown in the drawing).

0

five

0

is shown), the working channel 23 for connecting the camera to the isolation chamber with a drain or control line (not shown).

The valve operates as follows.

When advancing sections with active-support, the control fluid is fed through the end 20 of the additional working piston 14 and into the low pressure cavity 6, the pressure of which is limited by a retaining valve (not shown),

 By the action of fluid pressure, the additional discharge nopujenb 14, by the discharge port portion 10, moves the shutter 3 to the lowest position -. between each other, a high pressure cavity 5 connected to the piston position of the hydroresistance and a low pressure cavity b, while the pressure of the fluid in the cavity 6 drops to the setting pressure 11 of the supporting valve. With a pressure drop of 3–11 °; 1 ° 5 below the setting pressure of a deportable valve, hydraulic piston cavity is fed through the working channel 21.

At the end of the advancement of the lining section and the cessation of fluid supply by means of springs 18 and 8, as well as by means of pressure of fluid in the cavity of high pressure gap 3, the discharge pistons 10 and 14 return to their original position, locking the piston cavity of the hydraulic arm.

When discharging the hydrostack, the working fluid is supplied to the insulating chamber 17 through the working channel 23, and the low pressure cavity 6 is connected to the flow chamber. Under the pressure of the working fluid, pump 16 of the discharge piston 9 and pump 13 of the discharge piston 14 move and interlace the gate 3, connect the low pressure cavity 6 with the pressure of the high pressure 5, and therefore, the hydraulic piston cavity connected to a drain.

Claims (1)

CONTROLLED CHECK VALVE, comprising a housing with working channels and a cylindrical bore with a cylindrical shutter placed in it and two unloading pistons mounted concentrically one inside the other, arranged to form a control cavity and with the possibility of alternating interaction with the shutter, characterized in that, for the purpose of expansion the functionality of the valve by ensuring operation from different sources, it is equipped with an additional unloading piston installed in the control cavity with axially with said pistons and interacting with the internal piston when pressure is applied to the control cavity.