Fluid handling – Systems – Multi-way valve unit
Reexamination Certificate
2000-07-17
2001-04-24
Fox, John (Department: 3753)
Fluid handling
Systems
Multi-way valve unit
C137S246000
Reexamination Certificate
active
06220294
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to an improved switching valve which has a valve body, a valve control stem, an upper control valve unit and a lower control valve unit, a seal cap and a locking cap. The valve body and the valve control stem are integrally formed of plastics. The lower control valve unit is provided with oil reservoir cavities and oil grooves so as to permit the upper control valve unit and the lower control valve unit to be lubricantly engaged with each other in rotation. The flexible seal cap has tapered flange and a concentrically-ribbed bottom surface so that it can be better sealed in operation. The assembly of the switching valve is simple and speedy and the operation thereof is smooth and durable.
It is well known that there are many prior art switching valves sold in markets all over the world. In general, are common the structures of those conventional valves mainly applied to faucets of all kinds. They are all made up of a valve body, a valve control stem, a seal ring, a retaining block, an upper control valve unit and a lower control valve unit, a small seal ring, a large seal ring and a side seal ring. Such prior valves have some disadvantages in practical use given as follows:
1. The valve body and the valve control stem are complicated in structure and must be assembled together piece by piece, resulting in high cost of production and difficulty in practical assembly It becomes difficult to mass produce such valves.
2. The large seal ring is easily deformed under high pressure, so the faucet is easily subject to leakage in use.
3. The retaining blocks are usually made of metal, resulting in a handle of a faucet being difficult to operate.
SUMMARY OF THE INVENTION
Therefore, the primary object of the present invention is to provide an improved switching valve wherein the main control valve body and the valve control stem are integrally made of plastics without further manual processing so that they can be easily assembled with speed and produced at low cost.
Another object of the present invention is to provide an improved switching valve wherein a flexible seal cap is used to better protect the valve from leaking in operation.
One further object of the present invention is to provide an improved switching valve which is provided with a flexible seal cap which permit a handle of a faucet to be operated with readiness and smoothness.
One still further object of the present invention is to provide a switching valve wherein an upper control valve unit and a lower valve unit that are smoothly engaged with each other by way of lubricating oil, permitting the valve to operate in a longer and smoother manner.
REFERENCES:
patent: 3831621 (1974-08-01), Anthony et al.
patent: 4651770 (1987-03-01), Denham et al.
patent: 5107884 (1992-04-01), Orlandi
Bacon & Thomas PLLC
Chung Cheng Faucet Co. Ltd.
Fox John
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