DK143038B - PRESSURE EQUAL VALVE FOR BREATHING SYSTEMS - Google Patents

Description

(¾) (11) PUBLICATION MANUAL 1 ^ 3038

DENMARK (δ1), ntc '· 3 I ”I

r 16 K 24/02 § (21) Application No. 3758/7 ^ (22) Filed on 12, Ju ^ - · 197 ^ (24) Running day 12 Jul. 197 ^ (44) The application submitted and the petition published on 1 6. Π1 & Γ · 1 981

DIRECTORATE OF

PATENT AND TRADE BRANDS <30> Pnunted Bags Root from Death

12 Jul. 1973, 7309789, SE

(71) BJAERE-ELEMENT Ab, Industrivaegen, 260 91 - Foersloev, SE.

(72) Inventor: Sture Ericson, Vistorpsvaegen 17, 260 91 - Foersloev, SE.

(74) Authorized during the proceedings:

Patent law firm Magnus Jensens Eftf.

(64) Pressure equalizing valve for venting systems.

The present invention relates to an automatic pressure relief valve of the kind set forth in claim 1.

Known designs of this kind for venting of drainage pipes are based on conventional mechanical valves of, for example, the type disclosed in Swedish Patent Specification No. 85,867. Such known valves become useless after some time due to the aggressive environment which causes corrosion of the mechanical parts.

The object of the present invention is to provide a pressure relief valve for venting systems which, despite a simple and inexpensive construction, works reliably even after prolonged installation.

- 2 - U3038

This is achieved according to the invention by the construction of claim 1.

The valve shown can simply be made by inserting a 90 ° tube bend through a hole in the wall of the first tube and bonding it to obtain a good seal. On the upward opening of the pipe bend is placed the valve body, which may be part of an ordinary rubber ball, after which the lid is secured to the end of the pipe.

This simple construction is not only easy to manufacture, but also extremely reliable.

In the construction according to claim 2, it is achieved that the valve body can not be displaced to the side by means of negative pressure in the pipe so that it cannot resume the correct position at the mouth of the pipe bend.

If the valve is to be placed in a non-frost-proof room, for example a ceiling name, it is advantageous according to the invention that it be designed as described in claim 3.

The invention will now be explained in more detail in connection with the drawing, which shows a vertical section through a valve according to the invention.

The pressure relief valve consists, as shown, of a vertical pipe 1 with a cut-out 2 in the side. Through the cut, a pipe bend 3 is secured to the pipe 1, so that the mouth of the pipe bend in the pipe is horizontal and concentric with the pipe 1. The upper end of the pipe 1 is closed by a sealing, removable lid 4 and optionally coated with a porous material 5 such as polyurethane foam which prevents condensation and ice formation on the interior surfaces of the valve. The inner diameter of the pipe 1 is such that the valve can be mounted on a vent pipe not shown in the drawing.

The valve's only movable portion is preferably a hollow, semi-spherical rubber gasket 6 which covers the inner mouth of the tube bend 3. By underpressure in the system and thus in the pipe 1, the gasket 6 is lifted and allows air to enter the system.

When the pressure is equalized, the mouth of the pipe bend 3 is covered by the gasket 6, so that contaminated air cannot safely enter the system through the pipe bend 3.