Slide valve for a ventilation device

Abstract

The present invention relates to a valve device ( 1 ) for a ventilation installation. The valve device ( 1 ) comprises a vent surface ( 4 ) that is equipped with a plurality of vent apertures ( 5 ) and a slide valve ( 6 ) comprising a slide valve plate ( 7 ) equipped with a plurality of slide valve apertures ( 8 ). The valve plate formed such that it can be varied between taking a first position (I) at which the vent apertures ( 5 ) are covered by the slide valve plate ( 7 ), and taking a second position (II) at which at least some vent apertures ( 5 ) have surfaces that overlap with some slide valve apertures ( 8 ) such that an air flow is permitted through the valve device ( 1 ). The valve device ( 1 ) is designed such that when the slide valve plate ( 7 ) is positioned on that side of the vent surface ( 4 ) that normally has a relatively higher pressure, the high pressure side ( 9 ), than the other side, the low pressure side ( 10 ). The slide valve plate ( 7 ) is formed such that the force from the pressure difference between the high pressure side ( 9 ) and the low pressure side ( 10 ) is sufficient to retain the slide valve plate in its place at the vent surface ( 4 ) when it is in the first, closed position (I).

1 - 12 . (canceled) 
     
     
         13 . A valve device for a ventilation installation comprising at least one duct, where the valve device comprises a vent surface that is equipped with a plurality of vent apertures for passage of air in the duct, and a slide valve comprising a slide valve plate equipped with a plurality of slide valve apertures, said slide valve plate formed such that it can be varied between taking a first position (I) at which the slide valve is positioned on the vent surface such that the vent apertures are covered by the slide valve plate such that the valve device is closed and no flow is permitted through the valve device, and taking a second position (II) at which at least some vent apertures have surfaces that overlap with some slide valve apertures such that an air flow is permitted through the valve device and the valve device is designed such that the slide valve plate is positioned on that side of the vent surface that normally has a higher pressure, the high pressure side, than the other side, the low pressure side, wherein the slide valve plate is designed with respect to a weight and flexibility of the slide valve plate such that the force from the pressure difference of 100 Pascal between the high pressure side and the low pressure side is sufficient to retain the slide valve plate in its place at the vent surface when it is in the first, closed position (I) even if the slide valve plate is turned upside down. 
     
     
         14 . The valve device according to  claim 13 , wherein the slide valve plate has a thickness that falls below 1 mm, preferably below 0,7 mm and most preferably below 0,5 mm. 
     
     
         15 . The valve device according to  claim 13 , wherein the slide valve plate is made in a plastic material or a polymer. 
     
     
         16 . The valve device according to  claim 13 , wherein the slide valve plate has a Young's modulus that exceeds 2000 MPa. 
     
     
         17 . The valve device according to  claim 13 , wherein the slide valve plate is made in a homogenous piece of material. 
     
     
         18 . The valve device according to  claim 13 , wherein the slide valve plate is held in place against the vent surface only by the force from the pressure difference between the high pressure side and the low pressure side when the slide valve is in the first, closed position (I). 
     
     
         19 . The valve device according to  claim 13 , wherein the size and relative placement of the slide valve apertures of the slide valve plate corresponds to the vent apertures of the vent surface. 
     
     
         20 . The valve device according to  claim 13 , wherein the change of the valve device's position from first, closed position (I) to the second, open position (II) is executed by pulling the slide valve by means of a drawing arm attached to the front part of the slide valve plate, and that when the position of the slide valve is changed from the second, open position (II) to the first, closed position (I), is thus pushed by means of the drawing arm. 
     
     
         21 . The valve device according to  claim 13 , wherein the valve device is arranged to control the slide valve to shift between the two positions defined above, i.e. the first, closed position (I) and the second, open position (II), where the second, open position corresponds to that the valve device is completely open. 
     
     
         22 . The valve device according to  claim 20 , wherein the drawing arm is attached to both the front and rear part of the slide valve plate. 
     
     
         23 . The valve device according to  claim 20 , wherein the drawing arm is attached to a stiffened part that runs along the drawing direction of the slide valve plate from the front part to the rear part of the slide valve plate, for example a thin rod that runs over the whole slide valve and is attached to both ends.