Fluid handling – Systems – Multi-way valve unit
Reexamination Certificate
2001-12-28
2003-09-30
Fox, John (Department: 3753)
Fluid handling
Systems
Multi-way valve unit
C137S100000
Reexamination Certificate
active
06626208
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to an improved check valve for use in a pressure balance faucet. It is mainly made up of a control valve body, a check valve block, a pair of positioning pins, two seal rings, a pair check valve sets and a valve mount. The check valve sets are secured to the check valve block which is housed between the check valve body and the valve mount that are in threaded engagement with each other. As the valve sets are worn out, they can be easily and quickly replaced by first dismantling the control valve body from the valve mount and then the check valve block being picked out by pincers to get the valve sets replaced with ease, speed in a DIY manner.
Referring to
FIG. 1
, a conventional check valve for use in a faucet is mainly made up of a valve body
10
and a pair of check valve sets
20
. The valve body
10
is a hollow housing with a water discharge control handle at the top and is equipped with a hot and cold water pipeline connector
11
at the right and left side of its bottom. The connectors
11
are provided with inner threads
12
respectively. To the top and bottom of the valve body
10
is symmetrically coupled a water outlet duct
13
. Each check valve set
20
has a connecting pipe
21
and a check valve
22
. The connecting pipe
21
is hollow tube and has an externally threaded section
212
at each end. The check valve
22
has a hollow mounting seat
221
which is provided with a through hole
222
at the center of one end with a plurality of ribs outside the through hole. A spiral spring
223
is disposed in alignment with the through hole
222
and has a valve rod
224
engaged with the center thereof and led through the through hole
222
. The valve rod
224
has one large step-like end to prevent the same from disengaging from the mounting seat
221
which is wrapped with a sleeve
225
. Inside the sleeve
225
the mounting seat
221
can be rotated. A seal ring
226
is attached to the right end of the sleeve
225
.
Such a prior art check valve structure has a following disadvantage in use: The mounting seat
221
, sleeve
225
and seal ring
226
are made of rubber or plastics, and they will become hardened or shrunk after long period of use. The check valves
22
are easily out of function as the spring
224
is in fatigue. The check valves
22
of the check valve sets
20
must be replaced with the wall
30
partially removed, and the wall
30
must be repaired later the replacement. The cost of such a replacement is too high to be acceptable and the time is wasted.
SUMMARY OF THE INVENTION
The primary object of the present invention is to provide an improved check valve for use in a pressure balance faucet whose worn out parts can be easily and quickly replaced without structural damage of the wall around the fixed faucet.
Another object of the present invention is to provide an improved check valve for use in a pressure balance faucet wherein the check valve can effectively stop reverse flow of hot or cold water by way of a spring biased valve rod which can seal a stop hole of a sleeve of the check valve.
REFERENCES:
patent: 4314673 (1982-02-01), Rudelick
patent: 4457452 (1984-07-01), Symmons
patent: 4750519 (1988-06-01), Chao-Chun
patent: 5492149 (1996-02-01), Loscheder
patent: 5725010 (1998-03-01), Marty et al.
patent: 6021952 (2000-02-01), Antoniello et al.
patent: 6109288 (2000-08-01), Al-Hamlan
Fox John
Kuching International Ltd.
Troxell Law Office PLLC
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