DE1919662A1 - Screw-down shut-off valve - Google Patents

Description

Hansa MetalIwerke AG ", Stuttgart - Möhringen, Sigmaringerstr «107

Nieder3Chraub «» Shut-off valve

In Niederschraub-Absperrvent Hen liquid flow noises occur on "the * pressure on the difference between 2ufIuS- and outlet pressure dependent and when. kleiinen Öfjfriungsweiten are particularly strong "These disturbing FiIießgerSusche stir from the fact that takes place after the valve seat, a sudden strong cross-sectional extension to the discharge chamber towards ^ the greater fails, the less & r closing body dt vpm valve seat is lifted off and separation vortices, which are often accompanied by cavitation, to Consequence.

The invention is based on the object of creating a leather screw shut-off valve that is as quiet as possible. According to the invention, this object is achieved in a screw-down shut-off valve in that for flow calming and thereby for noise damping on the end face facing the valve seat

00984 4/09 83 _{0RleiNAL INSPECT} ED

de, s valve closing body is attached to the outside of a valve seat having cylindrical collar at least approximately free of play leading package of narrowly spaced thin Ring disks are arranged, which successively releases the expansion path j, enlarging the opening stroke opposite the valve seat.

Now is after the relatively narrowed flow opening on Valve seat of the Oruckabfalf delayed and thus immediately after a counterpressure built up on the valve seat, the "WlrbeibJ! dung undXavi station suppressed *

Good results have been achieved with embodiments in which the ring disks have an outside diameter of about twice is as large as the clear width at the valve seat * and the thickness of the annular disks and their axial spacings about l / i $ to i / o of the radial The width of the ring disks is »

The ring disk pack is preferably dimensioned in the axial direction so that that when the valve is fully open it moves all the way out over the valve seat is. As a result, the effect of the ring disk pack is essentially limited to the opening area in which the flow noise predominantly occur.

The ring disks can be made of metal or plastic be,

. ORIGINAL INSPECTED

009844/0983

The invention is described below with reference to an embodiment of a screw-down shut-off valve according to the invention shown in the drawing explained.

The valve housing denoted by 1 contains a valve seat 2 into which an inlet bore 3 located in the valve axis runs out can. The drainage opening 6 opens laterally from the drainage space 4. The valve seat 2 is assigned a valve body 7 with a flat seat surface, which receives a sealing washer 8 cooperating with the valve seat in an end-face recess. The valve closing body 7 has a rear, externally square hollow extension 9 ₃ which leads non-rotatably in the upper valve part 10 screwed into the valve housing and in which a threaded part 11 of the ₃ axially immovable valve spindle, which can be rotated with the operating handle, can be screwed. In the exemplary embodiment, the operating handle 12 is provided as a cap handle reaching down over the upper valve part.

On the end face of the valve closing body facing the valve seat 7 is a whole with 14 designated package of ring discs 15 is attached, which may be one piece with them by spacers are kept at a distance. In the exemplary embodiment, the annular disks 15 are lined up on pins 17 that are fixed on the valve body 7 and braced together on this. This is done at the free ends

009BU / 0983 BADORlGiNAL

at least three pins 17 formed a head 18 by welding or riveting. The inner diameter of the ring disk pack 14 is chosen so that the disk pack is guided at least approximately free of play on the collar having the valve seat 2.

The ring disks 15 can be made of metal or plastic. If the valve closing body 7 itself is made of plastic, so the alignment pins 17 can be attached to the plastic closing body be molded in one piece or cast from metal.

The outer diameter D of the annular discs 15 is in Ausführungsbeispiei about twice as large as the clear width d of the valve seat 2 »The strength s and the mutual distances h of the annular discs amount in the embodiment about l / lO of the clear width d on the valve seat,

. During the opening stroke, those located between the annular disks 15 are

Column one after the other for the outflow of the exiting via the valve seat 2 Liquid released to drain space 4.

009844/0983 BAD OWGlNAU

Claims (1)

Expectations ι 1 "] Niederschraub shut-off valve characterized in that the flow calming and noise attenuation at the valve seat (2) end face facing the valve closing body (7) on the outside is at least approximately free of play leading to a valve seat (2) having cylindrical collar (5} package (14} held by axial intervals in small * (h) thin annular discs (1 S) ISTJ arranged releases the enlarging during the opening opposite the valve seat successively di ^ n ,, RELAX-flow gaps 2 »Niederschraub-Absperrventif according to claim l _t characterized in that the annular discs (15) have a Äußendurchmesser (D), which is about twice as large as the clear width (d) Pam valve seat (2) and its thickness (s ) and their axial distances (h) about l / l2 to l / a of their radial width (b) amounts to »· 3 »Screw-down shut-off valve according to claims 1 and 2, characterized in that that the annular disk package (14) is dimensioned in its axial direction so that it is completely over the valve seat when the valve is fully open (2) is moved out. 4, screw-down shut-off valve according to claims 1 to 3, characterized in that that the annular disks (15) are made of metal. BAD ORlGlNAL '00 98 4 4 / "0 9 83 -K- 5. screw-down shut-off valve according to claims 1 to 3, characterized marked that the ring disks (15) are made of plastic » 009844/0983