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A valve assembly for plumbing installations. The valve assembly has a unitary valve body with three interconnected ports and a fluid control mechanism. Connector portions are formed about each port of the unitary valve body to thereby enable connection of the valve assembly into a fluid supply line

A valve assembly for plumbing installations. The valve assembly has a unitary valve body with three interconnected ports and a fluid control mechanism. Connector portions are formed about each port of the unitary valve body to thereby enable connection of the valve assembly into a fluid supply line and for connecting an appliance and various devices and fluid lines to the valve assembly. The fluid control mechanism of the valve assembly is constructed to direct fluid through the valve body and to enable the fluid flow to be shut off.

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That which is claimed is: 1. A valve assembly for plumbing installations comprising: a) a unitary valve body having an inner wall defining an inner cavity with a specified volume, a plurality of ports formed in said valve body and extending from said inner cavity, said ports being disposed in said

That which is claimed is: 1. A valve assembly for plumbing installations comprising: a) a unitary valve body having an inner wall defining an inner cavity with a specified volume, a plurality of ports formed in said valve body and extending from said inner cavity, said ports being disposed in said valve body at generally 90�� angles with respect to each other; b) an annular seal disposed in said inner cavity against said inner wall and around the opening of a single port to form a specified sealed port in said valve body; c) a rotatable member extending into said inner cavity and being operative generally axially perpendicular said sealed port and a plurality on non-sealed ports of said valve body; d) a lever member operative on the outside of said valve body and communicating with said rotatable shaft; e) a valve element fixed to said rotatable member, said valve element having a fluid blocking portion for sealing engagement against said annular seal of said sealed port, said valve element having a volume smaller than said specified volume of said inner cavity, whereby the movement of said lever member of said valve assembly allows fluid flow to be controlled at said sealed port while permitting continuous fluid communication through the remaining plurality of ports; f) means to fasten said lever member to said rotatable shaft; g) a device requiring a continuous fluid supply connected to one said non-sealed ports; and h) said inner cavity having a rear wall portion generally opposite said specified sealed port, wherein a washer is disposed against said back wall portion and wherein said valve element is disposed for rotation between said washer and said annular seal of said sealed port. 2. The valve assembly of claim 1, wherein said valve body has at least three ports. 3. The valve assembly of claim 2, wherein said valve body has four ports; wherein said specified sealed port is internally threaded, wherein a port opposite said rotatable shaft is internally threaded, wherein one said port has a hexagonal shape and wherein said port opposite said hexagonal shaped port is externally threaded. 4. The valve assembly of claim 1, wherein said device requiring a continuous fluid supply is a water hammer arrester or a pressure gauge device. 5. The valve assembly of claim 1, wherein each said port has a connector portion and wherein said connector portion of said valve body ports is selected from the group of ports consisting of a male threaded portion, a female threaded portion, NPSM, NPT, compression threaded portions, a copper sweat connection, a barb and a solvent weld joint. 6. The valve assembly of claim 1, wherein said lever member selectively rotates said valve element between an on and off position and wherein said valve body and lever member have formed cooperating stop members to permit said valve element to be rotated between said on and off positions. 7. The valve assembly of claim 1, wherein said valve body has three ports disposed at generally 90�� angles and wherein said rotatable shaft is disposed normal said three ports. 8. The valve assembly of claim 1, wherein said valve element is a generally spherical structure having intersecting channels therethrough forming a generally T-shaped configuration and wherein one said channel has an opening which aligns with said sealed port when said lever member is in the on position. 9. A valve assembly comprising: a) a unitary valve body having an internal cavity and at least three ports communicating with said internal cavity, said at least three ports defined by openings in said valve body, said internal cavity having a predetermined volume and an interior wall having a rear wall portion having a washer thereagainst; b) a rigid stem member and a movable ball valve element mounted on said rigid stem member for rotation in said internal cavity of said valve body, said ball valve element having a flow blocking portion, one said valve body port having an annular sealing element positioned against said interior wall in said internal cavity and forming one sealed port opposite said washer against said rear wall portion, said ball valve element being disposed in said internal cavity between said one sealed port and said washer against said rear wall portion, whereby said flow blocking portion of said movable valve element is arranged in said internal cavity to block flow to or from said one sealed port, said ball valve element having a volume smaller than said predetermined volume of said internal cavity to thereby allow fluid flow through said internal cavity and freely around said ball valve element between the other of said valve body ports; and c) a lever on the exterior of said unitary valve body, said lever connected to said rigid stem member to selectively rotate and move said flow blocking portion of said ball valve element with respect to said sealing element of said one sealed port, whereby said valve assembly controls fluid flow at said one sealed port and allows free fluid flow around said ball valve element between the other ports. 10. The valve assembly of claim 9, wherein said movable ball valve element has a generally round configuration having an axis of rotation and wherein said valve body has stop means to permit said lever to be rotated one quarter turn. 11. The valve assembly of claim 9, wherein said valve body is formed of a metallic composition and wherein said sealed port is internally threaded, wherein one port is externally threaded and wherein one said ports has a valve body portion about its opening in a formed hexagonal shape. 12. The valve assembly of claim 9, wherein said at least three ports comprise an inlet port, an outlet port and an auxiliary port and wherein a fluid receiving device is connected to said auxiliary port. 13. The valve assembly of claim 12, wherein said flow blocking portion is moved to block flow through said outlet port when in the off position and wherein said fluid receiving device is a water hammer arrestor or fluid pressure gauge. 14. The valve assembly of claim 9, wherein said at least three ports of said valve body have a connecting portion selected from the group of connecting portions consisting of a male threaded portion, a female threaded portion, NPSM, NPT, compression threaded portions, a copper sweat connection, a barb and a solvent weld joint. 15. A valve assembly for plumbing installations comprising: a) a unitary valve body having an internal cavity defined by an internal wall, a plurality of openings extending from said internal cavity, at least three said openings being ports for fluid flow, said ports comprising an inlet port, an outlet port and an auxiliary port, said internal cavity having a first volume, and one said port having an annular sealing member mounted against said internal wall and disposed in said internal cavity to form one sealed port and a plurality of fluid flow ports, said auxiliary port being one of said fluid flow ports; b) a rigid stem member having a movable valve element positioned in said internal cavity of said valve body, said valve element having a body with a second volume smaller than said first volume of said internal cavity, said valve element and having a flow blocking portion which is rotatable for sealing contact with said annular sealing member of said one sealed port; c) means to selectively rotate said rigid stem member and said flow blocking portion of said valve element body to and from sealing contact with said annular sealing member of said one sealed port; and d) a water hammer arrester mounted to said auxiliary port, whereby fluid flow is only controlled at said one sealed port and whereby fluid may freely flow through said internal cavity between said internal wall and said valve element body when said one sealed port is blocked and whereby fluid flow may be in communication with said water hammer arrester when said sealed port is blocked. 16. The valve assembly of claim 15, wherein said valve element is a ball valve having an axis of rotation, a spherical volume, a spherical surface area, a portion of which forming said flow blocking portion and being positioned generally normal said axis of rotation for sealing engagement with said annular sealing member of said one sealed port, said means to selectively move said flow blocking portion comprising a lever fixed to said rigid stem member, said valve body further having means to limit movement of said lever to rotate said flow blocking portion to and from said annular sealing member of said sealed port and wherein said valve element body has at least one channel with openings therethrough, one said opening for aligning with said sealed port, whereby rotation of said valve element body selectively rotates said flow blocking portion and said one opening of said at least one channel with respect to said one sealed port. 17. The valve assembly of claim 15, wherein said means to selectively rotate said rigid stem member and said valve element body is a control member connected to said rigid stem member, said control member being movable between an on and off position, said unitary valve body having stop means to permit said control member to be moved between said on and off positions. 18. The valve assembly of claim 15, wherein each said port has a connector portion and wherein said connector portion of said valve body ports is selected from the group of ports consisting of a male threaded portion, a female threaded portion, NPSM, NPT, compression threaded portions, a copper sweat connection, a barb and a solvent weld joint. 19. The valve assembly of claim 15, wherein said unitary valve body is formed of a metallic material, wherein said sealed port is internally threaded and wherein one said port is externally threaded.