Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
  • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
  • F16K1/24—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with valve members that, on opening of the valve, are initially lifted from the seat and next are turned around an axis parallel to the seat

Definitions

• the present invention resides in a valve system, and in particular to a valve system that is applicable for use in a gas stream.
• valves particularly those valves that are used in a gas stream, provide an efficient seal to prevent gas leakage.
• Typical valves that are used in such systems include a leaf valve or a plate valve.
• Such valves usually involve a simple one step action to move the valve from a closed to an open position.
• a plate valve such movement is usually a rotational movement wherein the plate is associated with a shaft, and rotation of the shaft causes the rotation of the plate.
• O-rings or other such seals are either positioned around the plate or valve disk itself, to ensure an adequate seal. In time, such seals may wear, or alternatively simply fail to seal the valve adequately due to the imprecise nature of the valve.
• a flange may be associated with a pipe or channel through which the gas, or other such fluid will flow.
• the flange will assist in the sealing of the valve by abutting against the plate when in a closed position. Again, the effectiveness of such sealing may be inhibited given the imprecise positioning of the valve relative to the flange, and fail to provide a positive seal for the gas stream.
• the present invention resides in a valve system comprising; an elongate valve body having a flange at one end,
• valve plate operable between an open and closed position, forming a seal with the said flange in the closed, position
• a valve plate support structure including;
• valve plate a cam seated within an abutment plate housing, and operable to effect movement of the valve plate
• the mechanism of the present invention allows for an efficient valve seal mechanism, sufficiently effective to provide a positive seal against gas flowing through a gas stream.
• the cam is constructed of a hardened material such as steel or the like.
• the form of the cam provides the valve plate support structure with the capability to undergo rotational and linear movement through operation of the valve system.
• the cam is seated in the abutment plate housing that houses an aubutment plate.
• the abutment plate is preferably constructed of a hardened steel, and has a flat surface that is able to interact with the rotation of the cam.
• the abutment plate itself may be included as an addition to the housing so that it can be removed and replaced if worn, or formed integrally with the housing.
• the abutment. plate provides a smooth surface to interact with the cam.
• the cam should be seated such that it is capable of rotational and linear movement within the abutment plate housing. The linear movement of the cam may also be a function of the positioning of the shaft through the cam.
• the rotation of the cam is limited by the form of the cam and the influence of the abutment plate.
• the cam is substantially ring shaped having at least a shaped portion, preferably a flatened surface on the outer circumference of the ring, that limits the rotational capability of the cam.
• the form of the cam should allow it to rotate in a planer orientation, through the influence of rotation of the shaft, until such time that the shaped portion meets the abutment plate wherein further rotation of the shaft results in a linear movement of the cam.
• the cam should also be seated within a cam housing associated with the valve plate.
• the cam housing should be so formed so that the cam can be secured into the housing, such that rotation or linear movement of the cam results in the same movement of the cam housing.
• the cam housing may be formed integrally with the valve plate such that resultant movement of the cam housing results in the same movement of the valve plate.
• the cam housing and the abutment plate housing substantially enclose the cam.
• the cam itself may be formed integrally with the cam housing. It is preferred however, that the cam is formed separately of the cam housing, as ' it allows for replacement of this cam, should it become worn.
• the valve plate itself is housed within a valve body, having at least a flange at one end of the valve body.
• a positive seal for the valve may be achieved by the linear movement of the valve plate toward the flange to seal against the flange.
• the valve system may also include a washer, preferably made of teflon, primarily to assist in the movement of the valve plate.
• the teflon washer is placed to surround the cam and to move with the cam. The washer is then able to provide a smooth surface for the relative movement between the valve plate and the mechanism that has secured the abutment plate housing to the valve body. O-rings associated with this securing mechanism, or the abutment plate housing will slide over the surface of the washer and provide an adequate seal for the valve system.
• the flange itself may be angled so that the valve plate is actually forced into a slightly truncated cone.
• O-rings or other resilient sealing means surrounding either the flange or the plate assist in sealing the valve.
• the O-ring is housed within an anular groove surrounding the outer circumference of the plate. The linear movement of the plate forces the plate into the angled flange providing a positive seal of the flange with the seal.
• the valve plate may be bevelled or shaped toward the outer circumference of the valve plate, to assist in forming the positive seal within the flange.
• the shaft is associated with the cam and is passed through the cam.
• the shaft preferably has a concentric axis with the abutment plate housing and an eccentric axis with the cam.
• the shaft is however connected to the cam, preferably by a key or such like, into a slot in the inner circumference of the cam.
• the cam will then rotate with the shaft, until such time that the shaped or flatened portion of the cam interacts with the abutment plate and prevent further rotation of the cam.
• the eccentric axis of the shaft and the cam the form of the shaped portion of the cam and of prevailing forces, further rotation of the shaft will result in a linear movement of the cam.
• Rotation of the shaft may be actuated by any standard means.
• rotation is mechanically actuated, for example by a hydraulic or pneumatic piston device or such like.
• the shaft may be manually driven.
• the shaft preferably interconnects two such valve plate support structures.
• the valve plate contains a rib along its back surface through which the shaft may pass.
• the rib provides strength for the valve plate and in conjunction with the shaft, also provides a pivotal axis upon which the valve plate can rotate.
• Figure 1 illustrates an exploded view of the valve system according to the invention.
• FIGS 2, 3 and 4 illustrate schematically the movement of the cam upon rotation of the shaft.
• Figure 5 illustrates a cross-sectional view of the valve system in a closed position.
• Figure 6 illustrates an actuating mechanism for the valve system.
• the valve system has a substantially cylindrical valve body 1 having a flange 2 and 3 associated at either end.
• a valve plate 4 is operable within the valve body to move from an open position, which will allow gas or such fluid to pass through the valve, to a closed position.
• the valve plate has a valve plate support structure to determine the movement of the plate.
• the support structure consists of a shaft 5 which passes through two support brackets 6, the brackets being located and fixed around apertures 8 through the valve body 1.
• the support bracket 6 also supports an abutment plate housing 10- that contains an abutment plate 12 and secures this to the valve body.
• the abutment plate housing is so formed to seat the cam 14.
• the cam is also formed to seat within cam housing 16.
• the shape of the cam 14 is so formed to key into the cam housing 16.
• Flatened surface 24 assists in securing the cam within the cam housing as it is secured by corresponding surface 24a.
• a washer 18 is included to assist in the smooth movement of the valve plate.
• the shaft itself passes through the cam and cam housing and through a rib 7 at the back of valve plate 4.
• the rib 7 provides strength and support for the valve plate, and also a pivotal axis for the valve plate.
• Shaft 5 includes a key 20 which is located within a slot 23 within the interior surface of the cam 14. This is better illustrated in figures 2 to 4. These figures better illustrate the movement of the cam upon rotation of the shaft.
• Figure 2 illustrates the valve in an open position with the cam 14 located within the abutment plate housing
• the shaft 5 has a concentric axis to the abutment plate housing 10, but an eccentric axis to the cam 14.
• the cam has a shaped section 21 resulting in flatened surface 22 on its outer perimeter.
• the shaft is able to rotate the cam through the connection of key 20 within slot 23.
• Figure 3 illustrates rotation of the shaft through approximately 90°, and consequential rotation of the cam through the same angle. Although not illustrated in this particular drawing, this will result in a 90° rotation of the valve plate, moving the valve plate from an open to a closed position. The movement of the valve plate is initiated through rotating of the cam housing 16, best illustrated in figure 1. At this point, abutment plate 12 has met with the shaped portion 21, and flatened surface 22 preventing the cam from further rotation.
• Figure 4 illustrates further rotation of the shaft through approximately 5°, and as a consequence of the eccentric axis with the cam, and of the shaped portion 21, the cam undergoes linear movement.
• linear movement of the cam as it is secured into cam housing 16 results in the same movement being applied to the cam housing and the valve plate. This will result in a linear movement forward of the valve plate to a sealed, closed position as it is pressed into flange 2.
• Figure 5 illustrates a cross-sectional view of the valve in a closed position as illustrated in figure 4 and is located in an anular groove.
• O-ring 26 is surrounding the outer perimeter of plate 4.
• Flange 2 has an angled surface 25, and rotation of shaft 5 results in the linear movement of cam 14, which is secured into housing 16, toward flange 2.
• the angle of the flange surface consequently wedges the outer surface of valve plate 4, and O-ring 26 into the flange.
• the valve plate 4 has a bevelled edge 33, to assist in forming an adquate seal Such linear movement of the plate provides a positive seal for the valve system.
• An end cap 29 is located at the end of shaft 5 and is positioned to hold the abutment plate housing, cam and cam housing in place. O-rings 31 and 34 assist in providing a seal around the valve plate support system.
• the valve plate is also formed against washer 18.
• the O-rings 31 are able to slide against the smooth surface of the washer, to assist in smooth movement of the valve plate- relative to the securing means 35, and to provide a more effective seal within the inner working of the valve system.
• Figure 6 illustrates a pneumatic actuating device 28 with arm 30 connected to shaft 5. Actuation of this device results in a rotation of the shaft 5 and consequently opening or closing of the valve system.
• the present valve system provides improved sealing for a gas stream or the like given, the dual movement of the valve plate. Such dual movement of the plate is achieved through a single movement of the actuating means. There is therefore provided an valve system providing a positive seal for such purposes.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Lift Valve (AREA)
• Sliding Valves (AREA)
• Mechanically-Actuated Valves (AREA)

Applications Claiming Priority (3)

Publications (2)

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ID=3775730

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• 1992
  • 1992-10-02 CA CA002120483A patent/CA2120483C/fr not_active Expired - Fee Related
  • 1992-10-02 EP EP92920754A patent/EP0611430A4/fr not_active Ceased
  • 1992-10-02 WO PCT/AU1992/000530 patent/WO1993007408A1/fr not_active Application Discontinuation

Non-Patent Citations (2)

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