DE1775748A1 - Valve - Google Patents

Description

Müller-Bore MpI - Ingo Gralfs Diplo-Phys. Cr ₀ Manits Dipl.-öhoau Dr. Deuxsl

Patent attorneys

Brauns ehwei ρ ;, den ^ ^r i, Septssiber 1968 Our reference: Li / Lie - Ii 817 ·

53-3.0hinei & fcri ek ■ Ivlokveld N. ¹ /. . Kxjverheids-straau 67 *
G ο udat Hi sder.lande

! "- •• iority: Srankrsich, 23- Teptiaber 19'67, No: 122 088

The invention relates to a valve with a housing that " with one pass and one ^ n axial to de ::. By"

gaag sliding sealing part is provided ο

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Versions of the type mentioned are well known , but it is extremely difficult to design such valves and to manufacture them so that they can operate under very high pressure conditions and pressure. IJECerenzen are absolutely tight and easy to operate. According to a well-known principle, V-intilo are provided with a Druckoitslasiung, which the ^T Jrückmittelotrom: aib Hi? .Fe a provided with a pressure compensation

BAD ORIEiNAL

mm *

Shut off the sealing cap. '? D thereby achieved wiii characterized in that two mutually GK of the pressure compensation ^"ij ~"'^"J" genüberliegende equal areas of the ^'J ~ sealing piston can be acted upon by the pressure. Through such a pressure equalization, the forces necessary for actuating the valve are indeed produced. However, such valves do not meet the requirements that arise at low pressures, since high pressures require large forces, i.e. those necessary for sealing generate specific surface pressure.,

Even with the depressurized valves it is extremely difficult, in addition to an absolutely tight seat of the valve also low actuation force required to achieve, especially with those valves, which oane special wide devices are under * open and close repeatedly at full pressure have to"

The invention is based on the object of a valve au create a tight fit under all pressure conditions and with all differential pressures has as well as can be actuated with low forces and repeatedly open and under full pressure closes =

109883 / 0S62 bad ORIGINAL

According to the present invention, this object is achieved by that the sealing part or the edge part of the passage cooperating with it is annular Has recess that a sealing ring is arranged in the recess, the circumference of the Recess protrudes and sealingly against the seat surface, like the inner surface of the passage or the Outer surface of the sealing part, and that a channel is provided which the recess with the High pressure side of the passage connects and with the Recess is connected at a point that is radially inside or outside of the sealing ring »

Because of the connecting channel that goes into the recess opens at a point away from the sealing surface of the ring, becomes the sealing ring due to the high pressure to the outside against the seat pressed- · Accordingly, the sealing ring is pressed by the Pressure medium, which is to be shut off by the valve, is pressed into a fixed sealing time so that a & absolute seal is achieved.

The recess and the sealing ring can be arranged in a movable sealing part, however, it is just as conceivable that this would take place

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177S748

which are housed in the housing.

Make another embodiment of the invention is a second sealing ring made from a material with greater resilience than that of the first sealing ring consists in the recess radially between the first sealing ring and the inner wall of the recess opposite the sealing surface, these two * te sealing ring causes the first sealing. ' ring with the valve position open, in which there is no differential pressure, already approximates in its necessary to produce the seal

Position "is. As soon as this construction the sealing part moves into the valve passage and closes the seat, acts on the Inside the first sealing ring lying pressure on the second sealing ring, which is thereby compressed in the axial direction and due to its resilience expands radially and together with the high pressure medium against the first O-ring presses. ,

In this construction, the annular recess is preferably connected to the the opposite side of the high pressure side of the

109883/0502

SAD ORIGINAL

Gang connected, the second channel with the recess at a point radially between the first sealing ring and the opposite inner wall the recess is in connection, whereby the two channels on opposite sides of the »wide Sealing ring open into the recess »This arrangement not only has the advantage that äfl the valve can be used as desired in a specific line system, since each side of the valve can be connected to the high pressure side. * can, but there is also the past.] - »that the second sealing ring is axially compressed with great certainty and radial forces on the first sealing

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ring exert There is an unbalanced connection between the space under the sealing ring and the inlet and outlet of the valve; provided _Λ and the second sealing ring prevents a leakage flow through the channels in every position j that the second sealing ring is pushed in the opposite direction by the high pressure medium entering the recess through eirie-i channel λ pray in the opposite direction, © direction? urged, the other channel is closed by the second sealing ring. Of course, the connection of the two channels with the recess must be designed in such a way that their openings pass through the second sealing

1Ö9883 / 0B62

6AD ORtGiK ¹ AL

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and at the same time it is prevented that a leakage flow can develop from the recess along the sides of the sealing ring. Preferably, the inclination of the oblique sides is selected of the trapezoidal cross-section of the recess so that the resultant force is generated \ by acting on the inside of the first seal ring high pressure is limited to a value which is sufficiently large to cause the seal , but is too small to push the sealing ring out of the recess, this hatred is of great importance when working with high bridges. Due to the high differential pressure, the first sealing ring would be pressed outwards with great force, which would make it more difficult to open the valve. However, it is a condition of these valves that they must open and close sequentially.

Damage to the valve seat or the sealing ring cannot occur. The stronger the slope is, the greater the resistance to the outward movement of the sealing ring is opposed.

109883/0562

ring are lockable. The openings of the channels are preferably in the opposite one arranged inner corners of the recess.

The two seal rings can irgendwel- consist chen suitable materials »ι wherein the selection of the material depends, in which

Pressure range the valve is to be used. The second sealing ring, designed as an O-ring can be made of soft, resilient material. The first sealing ring is made also made of flexible material, which, however, has a considerably greater strength and Hardness than that of the inner ring. However, it is also possible to have both rings from another Manufacture material, for example made of metal, because 'Tetall also have an elastic, yielding effect can. ·

The part of the annular recess in which the first sealing ring is arranged is expedient, provided with a trapezoidal cross-section, of which the short side of the parallel sides is close to the Sealing side. This shape makes the first sealing ring movable to the outside

10 * a * 3 / O $ f3

The part of the recess in which the second sealing ring is arranged to have a trapezoidal cross-section, the longer the parallel sides of the base of the other trapezoidal part of the recess corresponds to » This has the advantage that the second sealing ring is deformed in such a way that the second Pressure acting on the sealing ring creates a radial component that is radially outward against the inside aes first sealing ring works. The trapezoidal cross-sectional parts are preferably the recess isosceles.

Instead of a '0-shaped cross-section, the second sealing ring can also be designed differently in cross section, for example trapezoidal.

The invention is illustrated in the drawing by a pressure-relieved valve, for example, and is described in detail below with reference to the drawing.

Fig. 1 shows a cross section through a pressure relieved valve according to the invention.

10 ^ 883/0562

2 and 3 show on an enlarged scale to illustrate the sealing effect Area of the sealing part in its closed position.

The valve shown in Fig. 1 has a valve

valve housing 1 with a sealing part 2, the M

axially into a cylindrical passage 3 can be pushed and pulled out of this c

To move the sealing part 2, a spindle 4 is provided, which can be moved with the aid of a Handwheel 5 can move. The handwheel 5 is attached to a support sleeve 6, which has an internal screw thread is provided, which is engaged with a threaded end 7 of the spindle 4 «

stands. '™

The valve spindle 4 is designed as a rod which, with the aid of the screw thread parts 6 and 7 is reciprocable without any rotational movement to execute. The rod has a serrated surface, illustrated by the lines 8 is provided with a correspondingly toothed

10 * 0 * 3/01 * 2

Part 9 of an extension piece 10 of the sealing part 2 is in engagement.

The sleeve 6 is rotatably mounted in the housing 1 by means of a ball bearing 11 · When the hand. wheel 5 is rotated in a direction _t in which the rod or spindle 4 moves to the left % pushes the sealing part into the cylinder. See seat 3 * The seal is in a cylinder bore 12 'provided in the housing 1 and sealed against the bore with the aid of sealing rings 13 and 14. The sealing rings can be designed as O-rings or as lungs with a different cross-sectional shape The sealing part has a central channel 15 so that in the closed position the pressure of the medium acts not only on the face of the sealing part but also in the space 16 on the rear side of the sealing part, the surfaces of the head 17 and the extension piece 10 are the same, the sealing part is easy to move despite high pressure differences «

The section of the sealing part which effects the seal is designed as a head 17 with channels 18 which

I09t83 / 0562

connect the space in front of the head with channel 15, and is attached to the pipe part 2 via a screw thread 19. Between the head 17 and one King 20 is an annular space in which a sealing ring 21 made of relatively stiff, resilient Ί-aterial is embedded. this room has in the 'Juer-, cut the shape of an isosceles trapezoid. On the inside of the sealing ring 21 is a 0 - J ing 22 arranged, which is provided with a trapezoidal cross-section space under the sealing ring 2'i is not filled, but against the inner surface of the sealing ring 21 and the inner surface of the ring-shaped recess 23j which is formed by the * outer surface 24- of the sealing part 2 is formed According to the invention, there is a Connection between the inlet side and the Aus-3sB *? Eiti? d>? 8 valve uad the inlet space 23 »This Connection is established through channels 25 and / or 26

In the closed position shown in Figs. 2 and 3, the sealing ring 21 lies against the inner surface of the cylindrical passage 3. In Fig. 3 is the State illustrated in which the right Geite of the sealing band part is acted upon with ^ jerk, wherein

109883/0662

12 ·

the pressure medium via the channel 25 into the space 23 penetrates and presses the ring 22 to the left «If there is a pressure difference, the ring 22 is deformed, as shown in Fig. 2 »This deformation not only ensures complete sealing of the connection and the channel 26, but also causes a radially outward force through which the Sealing ring 21 radial ^ epjen the cylindrical Situ 3 is pressed »

Figure 3 illustrates de :; State _T in which there was high pressure on the left hand side. In this case, the Hing 22 is pressed into the right corners of the ring area under the sealing ring 21, whereby the connection 28 and the channel 25 are sealed. As described above, the deformation of the ring 22 causes a radially outwardly directed force which presses the sealing ring 21 against the cylindrical seat 3.

These radial forces are large enough to ensure a good seal, but they do not make it difficult the opening of the valve and are not a hindrance to the closing process, as they do not yet exist,

109883/0562

as long as the poetry is not yet effective »That valve according to the invention described above is at Pressures up to 600 atmospheres have been tested and has proven to be absolutely tight and was very easy to operate.

The invention is however also applicable to valves which are not depressurized _s or valves which are operated in tfeise other than in the embodiment shown in Fig. 1 Construction "

if in another embodiment of the invention Valve of the sealing part arranged in the housing the drawing can also be used. The part 2 shown in FIGS. 2 and 3 is then installed the housing and part 3 of the sealing part.

The invention is also applicable to valves in which the pressure direction of the sealing ring against the The seat is not in a radial plane,

109883/0862

Claims (1)

Expectations 1ο valve with a housing that has a passage and a sealing part which is axially displaceable to the passage is provided, characterized in that that the sealing part (2) or that cooperating with this wall part of the passage (3) a has annular recess (23) that a sealing ring (21) is arranged in the recess (23) is, which protrudes at the periphery from the recess (23) and sealingly against the seat surface, like the inner one Surface of the passage (3) or the outer surface of the sealing part (2), and that a. channel iet provided that the recess (23) with the 1 · High pressure side of the passage connects and with the recess is connected at one point, which lies radially to your sealing ring (21) inside or outside - 2. Valve according to claim 1, characterized in that a second sealing ring (22), which consists of a Material of greater flexibility than that of the first sealing ring (21) consists, radially between the first sealing ring (21) and the opposite inner wall of the recess is arranged, 109883/0562 ♦ -15 - β valve after. Claim 1 or 2, characterized in that the annular recess (23). via a second channel with the side of the passage (3) opposite the high pressure side is connected, the second channel with the recess (23) at a point radially between the first sealing ring (21) and the opposite inner wall of Auseparut \ g (2. ^) in connection stands, and that the two channels on opposite one another Site of the second division of the third ring (22) open into the recess (23). 4ο valve according to one of claims 1 to 3 »thereby characterized in that the valve is depressurized, v.cbe.i the opposite equal surfaces of the axially displaceable sealing part (2) are subjected to the same pressure. "Valve according to one of the preceding claims, characterized in that the part of the annular Recess (23) which receives the first sealing ring (21) has a trapezoidal cross section, the narrower of the two being parallel Pages is arranged on the seal side. 109883/0562 8AD 6ö valve according to claim 5, characterized in that the inclination of the inclined sides of the trapezoidal cross-section of the recess (23) is chosen so that the resulting force generated by the high pressure acting on the inside of the first sealing ring (21) is applied to one vVert is limited, which is large enough to effect the seal, but too small to press the sealing ring (21) out of the recess (25) _o 7ο valve according to one of the preceding claims, characterized in that the part of the recess (23) in which the second sealing ring (22) is arranged is, has a trapezoidal cross-section, of which the longer of the parallel sides of the Base side of the other trapezoidal part of the recess (23) corresponds. 8. Valve according to one of claims 5 to 7 »characterized in that the trapezoidal cross-sectional parts the recess (23) are isosceles. 109883/0562 Blank page