FI71397B - ANORDNING VID VALVE AV VRIDSPJAELLSTYP - Google Patents

Description

ANNOUNCEMENT n λ t Q 7 (11) UTLÄGGNINGSSKRIFT f 'O? f (45) pn f.c.Mt Λ 3? i-.t! 3 12 1J2O (51) Kv.lk. * / lnt.CI.4 F 16 K 1/226 (21) Patent application - Patentansöknfng 781 102 (22) Application date - Ansökningsdag 11.OA.78 (Fl) (23) Start date - Giltighetsdag 11 .OA.78 (41) Made public - Blivit offentlig 15-10.78

National Board of Patents and Registration / 44) Date of display and publication. - 09.09.86

Patent and registration authorities V 'Ansökan utlagd och utl.skriften publlcerad (86) Kv. application - Int. ansökan (32) (33) (31) Privilege claimed — Begärd priority lA.0A.77

Sweden-Sweden (SE) 770A262-0 (71) (72) Jörg Lilljeqvist, Vesslevägen 16, 183 AO Täby-Enstapark,

Sweden i-Sverige (SE) (7A) Berggren Oy Ab (5A) Device in a flip-type valve -

Anordning vid ventil av vridspjällstyp

The present invention relates to a device in a pivot-type valve for a medium, preferably a high-pressure fluid, comprising a valve housing 1, a ratchet flap 3 rotatable in this respect and pivotable about an axis 2, arranged so as to be located in a plane passing through the axis in a plane parallel to but at a distance therefrom, a control device and a sealing element located next to the flap 3 and intended to co-operate with the circumferential seat surface 4 in the valve housing 1.

The invention is particularly intended for the so-called for throttle valves, in which the shut-off device or valve body is brought into sealing operation together with the valve seats by turning or axially displacing. However, the invention can also be advantageously used to provide good sealing in most types of valves.

In known valves, the valve body or shut-off device with its circumferential parts is brought in one step against the valve seat, against which it is firmly pressed. One cooperating sealing surface may have a rubber-like or other flexible part.

In this case, it is known that the tightness of the valve can be improved by compressing it in two steps. In addition, it is known that the tightness is improved if two valves are placed in succession or if the valve is provided with two bodies or shut-off devices with their own seats.

The disadvantage of all known valves is that the valve is not tight if the seat is damaged in any way. Another disadvantage is that when the system is closed on one side of the valve and then emptied, it is not possible to make sure in advance that the valve is tight on the other side.

Said disadvantages are eliminated by the device according to the invention, which is characterized by what is set forth in the appended claim 1.

If the first seat in the valve according to the invention is damaged, the leakage water can be discharged into the outlet pipe or the like through the drain passage and the associated valve. Since the drain passage is open, the differential pressure between the two sealing parts of the valve body and the drained line is removed. This has the advantage that even if both sealing parts are damaged, no significant leakage occurs.

The invention also provides the advantage that in connection with the closing of the valve on the other side and the emptying of the line, which is often necessary in the repair of leaks or the like, the tightness of the valve can be checked and ensured. Such a check is carried out by closing the valve and opening the drain channel between the sealing parts. If water leaks from the drain valve list, the valve will leak. If the amount is small, the valve can be assumed to be tight despite leaking seats as long as the drain valve is open.

Embodiments of a device according to the invention will be described below with reference to the accompanying drawing, in which Figure 1 shows a cross-sectional view of an embodiment of a valve according to the invention and Figure 2 shows a cross-sectional view of another embodiment of a valve.

The drawing only shows details that are important to clarify the operation.

A sealing surface is arranged in the valve housing 1, Fig. 1. In this case, it consists of a ring made of stainless material, which is welded to the housing 1. The valve housing is supported by a shaft 2 which supports the valve body 3, which in this case is a pivot flap. By means of means not shown, the valve body 3 can be turned to the closed and open position.

Sealing parts 5 and 6 are arranged in the valve body 3 acting as a closing device, which in the example shown are parts of a unitary unit made of rubber material or the like. Both sealing parts 5 and 6 are pressed in a closed position against the seat or sealing surface 4, whereby a sealing effect is obtained between the sealing parts 5 and 6 and the seat surface 4.

At least one drain channel 7 with drain valves 8 is arranged at the seat 4 between the two contact surfaces of the sealing parts 4 and 5.

The valve is basically closed as follows. The valve body 3 is turned to the closed position by means of the shaft 2, whereby the sealing parts 5 and 6 contact the seat surface 4 of the sealing valve housing 1 from the sealing part.

The valve 8 of the drain passage 7 is then opened in order to check, on the one hand, whether the valve is tight and, on the other hand, to provide a lower separation pressure over the second sealing part, which improves the sealing performance.

The second basic structure of the sealing elements is shown in Fig. 2. Here the sealing parts 5 'and 6' consist of two separate units separated by the intermediate part 9. Otherwise the valve is similar in structure to the structure according to Fig. 1.

This also applies to steering torques and the tightening of the components.

71 397 4

In another embodiment not shown, the sealing parts or the units forming them are arranged in the valve base, while the seat or sealing surface cooperating with them, which is preferably made of stainless steel, is arranged on the shut-off device, the flap or the valve body.

Control also takes place in this structure as described above.

The valves according to the invention can furthermore be connected to other sealing systems, for example means for post-sealing, according to Swedish Patent No. 353,789. Alternatively, sealing liquids, grease, etc. can be sprayed between the cooperating surfaces.

In addition, the sealing parts can be made of so-called instead of the rubber material shown in the lamella seals or the like or parts 5 and 6 formed in a similar manner.

The embodiments described herein are to be considered as examples only, as the idea of the invention may be used in valve structures other than those described above. The closing device also does not have to be a valve plate, but may just as well be a slider, a piston, etc. The device is also not limited to a radial seal, because the movable sealing element can equally move axially to seal between two radial surfaces or at any angle between radial and axial directions. .

Claims (7)

Apparatus for a valve of the pivot type, for a medium, for a fluid of the most suitable high pressure, comprising a valve housing (1), a relative flap (3) pivotable about the shaft (2) and arranged so as to be located through the shaft. in a plane parallel to but at a distance from the plane, a control device and a sealing element located next to the flap (3) and intended to co-operate with the circumferential seat surface (4) in the valve housing (1), characterized in that the sealing element there are two sealing parts (5 and 6) spaced apart in the direction of flow of the controlled medium, which in the closed position of the valve together with the seat surface (4) limit the space so that a closable channel (7) leaves said space, which closes the valve in the closed position, on the other hand, allows the medium to be removed from the space of the sealing test or to distribute the pressure between the sealing parts, and to bring the medium into the space for pressure testing of the sealing parts. Device according to Claim 1, characterized in that the sealing parts (5, 6, Fig. 1) of the sealing element consist of separate parts. Device according to Claim 1, characterized in that the sealing parts (5, 6, Fig. 2) of the sealing element are parts of one unit. Device according to Claim 1, characterized in that the closable channel (7) is arranged in the valve housing (1). Device according to Claims 1, 2 or 3, characterized in that the closable channel is arranged in a pivoting valve flap. 6 71397 5 71 397 Device according to claim 1, characterized in that the at least one sealing part is provided with means for post-sealing known per se, these means consisting of a pressure medium placed in a hollow space behind the sealing part and pressing the sealing part towards the seat surface. Device according to one of the preceding claims, characterized in that the parts of the sealing parts (5, 6) which cooperate at least with the opposite seat or sealing surface consist of a rubber material or the like.