Fluid handling – Systems – Sequentially progressive opening or closing of plural valves
Patent
1990-12-07
1993-02-23
Nilson, Robert G.
Fluid handling
Systems
Sequentially progressive opening or closing of plural valves
251360, 251364, 251900, F16K 144
Patent
active
051881500
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a valve for use in the control of fluid flow in a pipe system. The invention has particular application to a tap which is used for controlling the supply of mains-pressure water and, for convenience of reference, the invention is hereinafter described in the context of such application. However, it will be understood that the invention does in fact have broader application, to many different types of valve structures and various fluid pressures.
BACKGROUND OF THE INVENTION
Conventional taps as described in Australian Standards 1718-1988 and 3718-1988 comprise a metal body having an inlet end which is connectable to a supply pipe, an outlet end in the form of a spout, and a passageway extending between the inlet and outlet ends. An opening (hereinafter referred to as a valve port) is provided in the passageway, which is surrounded on its upper surface by an annular valve seat. A valve member is carried by a spindle which is engaged in threaded relationship with a spindle housing, and the spindle can be turned in one direction to drive the valve member against the valve seat and thereby "close" the tap. The tap is "opened" by turning the spindle in the opposite direction.
The valve member usually comprises a resilient washer which is carried on a loose jumper valve which is connected to its valve stem, and the stem is slidable in the spindle. Thus, when the tap is opened, the spindle is screwed in a direction away from the valve seat and the valve member is forced open against the spindle by water pressure.
The tap as above described would normally form one of a network of taps throughout a building. Thus, the water pressure which would be acting on the valve member in any one tap will be dependent upon the number of taps which are opened and closed in the network.
In some situations, taps are left permanently open, for example when they are attached via hoses or other pipes to domestic washing machines and/or dishwashers etc. In-line taps are also used to isolate certain areas of a building and/or to isolate toilet cisterns and hot water services. In these situations, where no water is flowing through the taps, a valve member may be fully open or closed, or be in a floating intermediate position. Then, should a sudden increase in water pressure occur, for example when a tap in another location is quickly turned off resulting in a shockwave being created within the pipe, the increased pressure will force the valve member to slam against the spindle or valve seat. The noise produced by this phenomenon is commonly referred to as water hammer and can be a source of considerable annoyance in a household or other situation because of the level of noise produced. Water hammer is just one of numerous problems which are prevalent in taps which utilize conventional valves. Some of the more common problems associated with conventional valves are listed as follows: compounded with wear and tear of the washer. tap, the valve seat of a tap is usually worn away as well as the valve washer. can also occur. water pressure as small movements of the tap handle and spindle result in coarse adjustments of water flow. which are left open for years suffer from washer deterioration. When these taps are eventually turned off they leak badly.
DISCLOSURE OF THE INVENTION
According to the present invention, there is provided a valve assembly for control of fluid flow in the pipes. The valve assembly comprises a valve body member, a valve seat member and an annular sealing member which is arranged to be located around the periphery of the valve seat member by a locating means. In use, the valve seat member and annular sealing member are separated from a valve seat, and when the valve body member is forced against the annular sealing member the annular sealing member then forms a seal with the valve body member and valve seat.
Preferably the valve body member comprises a valve disc and a valve stem.
Preferably the locating means comprises a peripheral groove in the valve seat membe
REFERENCES:
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patent: 2616653 (1952-11-01), Tarr
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patent: 2969951 (1961-01-01), Walton
patent: 3318577 (1967-05-01), Banks
patent: 3441051 (1969-04-01), Morse
patent: 3548869 (1970-12-01), Weise
patent: 3557837 (1971-01-01), Giwosky
patent: 3618893 (1971-11-01), Bois
patent: 4008298 (1977-02-01), Quantz
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