MXPA01001074A - Two-way check valve - Google Patents

Abstract

The check valve has rotationally symmetric outer boundaries with a transverse plate separating a first portion which is intended to be within a first air space and a second portion which is intended to be within a second air space. Two internal passageways are formed within the interior of the check valve, each with an opening in the first portion and another opening in the second portion. The first and second portions each include a circular channel with flared walls into which one of the openings is formed. Each circular channel includes an O-ring which serves as a valve to control flow into the respective internal passageway.

Description

TWO-WAY STEP VALVE BACKGROUND OF THE INVENTION Field of the Invention This invention relates to a two-way through valve, so that the air flow of an air space is through a first passage, while the air flow into the air space is through a second passage. The first and second passage include openings which are selectively closed by means of o-rings. Description of the Prior Art In the prior art, flow restrictors or passage valves, which are unidirectional, have been provided. Bidirectional flow valves and flow limiters, as well as many of the unidirectional and flow restrictor flow valves, tended to have a complicated structure with high concurrent manufacturing and maintenance costs. In addition, some of these devices had not been closed at the moment when the plunger stopped moving and had not satisfactorily provided the consistency of the execution, due to the safety in the movement of the lip seal. Similarly, many of these devices could not be self-cleaning, due to that, maintenance costs increased more.

Furthermore, in the prior art, the damping action may be dependent on the lip seal which is fixed against the face of the plunger in a consistent manner. This action may be prone to accumulate lubricants, debris and moisture that get caught in the "sandwich" action. In addition, a linear action must occur to move the lip seal from the closed position to a non-closed position. The representative prior art includes U.S. Patent No. 5,762,103, entitled "Step Valve with Tilt O-Ring", issued June 9, 1998 to Gregoire; U.S. Patent No. 5,660,205 entitled "One Way Valve", issued August 26,. 1997 to Epstein; U.S. Patent No. 5,126,722 entitled "Lubrication Point Monitor", issued on June 30, 1992 to Kamis; U.S. Patent No. 4,549,565 entitled "Reconnection of the Rupture Disc Assembly", issued October 29, 1985 to Short III; Patent of the United States NO. 4,497,749 entitled "Step Valve for Ammonia Injector Apparatus", issued February 5, 1985 to Astrauss; U.S. Patent No. 4,428,566 entitled "Two-Tube Hydropneumatic Shock Absorber", issued January 31, 1984 to Bean et al .; U.S. Patent No. 4,237,935 entitled "Hydraulic Pressure and Fluid Insulating Safety Valve", issued December 9, 1980 to Delmonte et al .; U.S. Patent No. 4,214,607 entitled "Limiter of Unidirectional flow ", issued on July 29, 1980 to Bouteille; and U.S. Patent No. 4,111,228 entitled "Breathing Valve, Especially for Anesthesia Circuits", issued September 5, 1978 to Simionescu. OBJECTIVES AND SUMMARY OF THE INVENTION It is therefore an object of this invention to provide a bidirectional bypass valve. It is therefore another object of this invention to provide a bidirectional bypass valve, which has a simple design. Therefore, another objective of this invention is to provide a bidirectional valve, which has reduced maintenance requirements. Therefore, a further object of this invention is to provide a bidirectional bypass valve, which can be configured in a self-cleaning configuration. Still another object of the present invention is to provide a bidirectional bypass valve, which closes at the moment when the plunger stops moving. Therefore still another objective of the present invention is to provide a bidirectional valve which has execution consistency. Therefore, another objective of the present invention is to provide a bidirectional bypass valve, which is economical to manufacture. These and other objectives are achieved by providing a bidirectional bypass valve with a unitary body with two parts separated by a transverse plate and two passages through them. The first part is intended to be in communication with a first airspace, while the second part is intended to be in communication with a second airspace. A first of these passages leads from an opening in a circular channel, in which an O-ring is hooked in the first part, towards an opening at the end of the second part. Also, the second of the passages leads from an opening in a circular channel in which an O-ring is engaged in the second part, towards an opening at the end of the first part. The O-rings selectively open and close the openings in the passages in response to pressure differences between the first and second airspaces. BRIEF DESCRIPTION OF THE DRAWINGS The additional objects and advantages of the invention will become apparent, from the following description and claims, and from the attached drawings, wherein: Figure 1 is a cross-sectional view of the valve of the passage of the present invention. Figure 2 is a cross-sectional view of the through valve of the present invention, shown in a common installation position. Figure 3 is a bottom perspective view of the through valve of the present invention. Figure 4 is a top perspective view of the through valve of the present invention. DETAILED DESCRIPTION OF THE PREFERRED FORM OF EMBODIMENT Referring now to the drawings in detail, where like numerals refer to like elements in all the various views, one can observe that Figure 1 is a cross-sectional view showing the outer contours and internal detail of the step valve 10 of the present invention. While the outer contours are generally rationally symmetric with respect to the axis of rotation 1000, the interior detail is asymmetric. The bypass valve 10 includes the central transverse disc plate 12 with the upper part 14, which extends upwards thereof, ending in the upper surface 16, and the lower part 18 extends downwards thereof, ending in the lower surface 20 (the terms "upper" and "lower" are relative, and refer to the orientation illustrated in the various figures). The upper part 14 includes toroidal walls 22 which are formed immediately above the central transverse disc plate 12. The toroidal walls 22 protrude slightly outwards, while the walls 22 extend away from the central transverse disc plate 12. The lip 24 is formed above the toroidal walls 22, thereby forming the first circular closing channel 26 outward, adjacent to the toroidal walls 22. The walls of inwardly converging sides 28 extend upwardly from the lip 24 with toroidal plate 30 and terminates in the upper surface 16. The circular retaining lip that projects downwardly 34, is formed in the dowel walls 32 downwards, adjacent from the upper surface 16. The lower position 18 includes the cylindrical section 38 with the second circular closing channel 44, which is formed adjacent upwards from the lower surface 20 and the third circular closing channel 40 which is formed adjacent down from the central transverse disc plate. The lower part 18 also includes tapered walls 45 which are formed between the second circular closing channel 44 and the lower surface 20. The third circular closing channel 40 includes the inner wall 42, which is parallel with the outer wall of the section cylindrical 38. However, the second circular closing channel 44 includes the inner wall 46, which protrudes slightly, so that it has a slightly smaller diameter, while the inner wall 46 extends upwards in the direction towards the plate. central transverse disc 12.

The first internal passage 62 includes an opening 64 in the lower surface 20, with a vertical arrow extending upwards 66 which leads to the upper diagonal arrow 68 and to the opening 70 in the first circular closing channel 26. Likewise, the second inner passage 50 includes an opening 52 in the upper surface 16, with a vertical arrow extending downwards 54, leading to the lower diagonal arrow 56 and an opening 58 in the second circular closing channel 44. Figures 3 and 4 are perspective views, which show the openings 52, 58, 64 and 70. In order of position or location, the first and second O-rings 72, 76 respectively, openings 70, 58, are formed in the part of the first and second channel of circular closure 26, 44, which have a slightly reduced diameter due to the projection of the walls 22, 46 respectively. As shown in Figure 2, a commonly installed position is observed, wherein the first O-ring 72 is installed and engaged within the first circular closing channel 26, the second O-ring 76 is installed and engaged within the second circular closing channel 44, and the third O-ring 74 is installed and engaged within the third circular closing channel 40. The first and second O-rings 72, 76 have some "play" within the first and second circular closing channels 26, 44, so as to selectively close and open the openings 70, 58, respectively. However, commonly, the third O-ring 74 is firmly attached within the third channel of. circular closure .40 without significant "game" within it. Commonly, the plate 100 in Figure 2 separates the first air space 200 from the second air space 202. The bypass valve 10 is inserted and fitted within the opening 102 of the plate 100, firmly engaging the third O-ring 14, and maintaining the separation between the first and second airspace 200, 202. Additionally, the hose 300, which commonly provides a clean air or clean gas, extends around the cylindrical pin 32. The circular retaining lip projects toward At the bottom 34, it engages the hose 300 and tends to prevent removal of the hose 300 from the cylindrical shank 32. As the pressure in the second airspace 202 increases, the second O-ring 76 is pushed against the opening 58, thereby closing the second internal passage 50. The projection of the inner wall 46 within the second circular closing channel 44 assists in the proper positioning of the second O-ring 76. Simultaneously, the pressure The first internal passage 62 will be increased, by pushing the first O-ring 72, which is ordinarily placed against the opening 70 in the first circular closing channel 26, by means of the action of the toroidal walls 22, away from the opening 70, thereby allowing the air pressure in the second airspace 202 to decrease, until it equals the air pressure in the first airspace 200. When a second airspace 202 pulls a vacuum or reduced air pressure with respect to the first air gap 200, the reduced air pressure in the first internal passage 62 pulls the first O-ring 72, causing the first O-ring to close in front of the opening 70. However, due to the pressure in the second internal passage 50 (which is in communication with the air or gas provided by hose 300.}. is larger than in the second airspace 202, the second O-ring 76 moves away from the opening 58 allowing the pressure in the second airspace 202 to equalize. The second internal passage 50 opens inside the hose 300, which provides a source of clean air. Therefore the bypass valve 10 allows clean air to flow from the hose 300, through the second internal passage 50 to the second air space 202. The bypass valve 10 further allows dirty air to flow from the second air space 202, through the first internal passage 62 and within the first airspace 200. Furthermore, the minimal movement of the o-rings 72, 76 allows the internal passages 50, 62 to remain free, by eliminating any "sandwich" effect during the operation . Therefore, most of the various objectives and advantages mentioned above are effectively achieved. Although a simple preferred embodiment of the invention was deployed and described in detail herein, it should be understood that this invention is not in any way limiting thereby and its field will be determined by that of the appended claims.

Claims (10)

1. CLAIMS '1. A bypass valve comprising: a first and second part; a plaque that separates that first part from the second; a first internal passage including a first opening in that part and a second opening in the second part; a second internal passage, including a third, opening in that first part, and a fourth opening in the second part; that first part that includes the shape of the first valve to selectively open and close said first opening; and the second part including the shape of the second valve for selectively opening and closing the fourth opening.
2. 2. The bypass valve of Claim 1, wherein the external contours of the bypass valve are rationally symmetric with respect to an axis of revolution and wherein said plate is perpendicular to the axis of revolution.
3. The bypass valve of Claim 2, wherein a first circular channel is formed in said first portion, and wherein the first opening is formed within the first circular channel.
4. The bypass valve of Claim 3, wherein a second circular channel is formed in the second part, and where the fourth opening is formed within the second circular channel.
5. The bypass valve of Claim 4, wherein the shape of the first valve comprises a first O-ring in the first circular channel, and wherein the second valve form comprises a second O-ring in the second circular channel.
6. The step valve of Claim 5, wherein the inner walls of the first and second circular channels are tapered, thus tending to place the first O-ring in front of the first opening and with the tendency to place the second O-ring in front of the fourth opening.
7. The bypass valve of Claim 6, wherein the first circular channel and the second circular channel are somewhat wider than the first and second O-rings, respectively, therefore allowing the "play" of the first O-ring and the second O-ring inside the first circular channel and said second circular channel, respectively.
8. The bypass valve of Claim 7 wherein the second opening is formed at one end of the second part, and wherein the third opening is formed from one end of the first part.
9. 9. The bypass valve of Claim 8 further includes a third circular channel substantially adjacent to said plate and a third O-ring within that third circular channel for maintaining a closure between a first air space into which the first air gap is inserted. part and a second airspace into which the second part is inserted. The bypass valve of Claim 9, wherein the first part includes a spigot for receiving a hose, the spike includes a protruding detent lip for engaging the sheath.