Reliable flush valve

#A conventional flush valve of a plumbing system as used for flushing a toilet or urinal as shown in FIG. 1 includes: a diaphragm valve F formed in a central portion of a valve body communicated with an inlet pipe I for supplying water W therein, a solenoid S normally closing a valve opening V and operatively opened by a controller having a sensor A when detecting the presence of a person using the toilet or urinal for discharging flush water from the drain pipe D having a listed atmospheric vacuum breaker U mounted therein.

#Upon opening of the solenoid valve S, the water W will flow through an orifice O formed in the diaphragm valve F, a valve opening V, and a central opening C in a stem T of the diaphragm valve F to be finally drained through the drain pipe D. The diaphragm stem T is reciprocatively moved and guided in a central hole H recessed in a central body portion, having a sealing ring R retained on the stem T for water sealing.

#However, the conventional flush valve of FIG. 1 has the following drawbacks:

#FIG. 1 is a sectional drawing showing a conventional flush valve.

#FIG. 2 is a sectional drawing of the present invention when normally closed.

#FIG. 3 shows an opened valve of the present invention for flushing purpose.

#As shown in FIGS. 2-5, a flush valve of a plumbing system comprises: a valve body 1; a diaphragm valve 2 flexibly mounted in the valve body 1; a filter 3 and a magnet 3a provided in the valve body 1 for filtering off dirts, particles and rust carried in the water flow; a limit valve 4 flexibly secured in the valve body 1 and juxtapositioned to the diaphragm valve 2; a manual relief valve 5 and an electrically operated relief valve 6 diametrically mounted on the valve body 1 for respectively controlling the opening of the diaphragm valve in a pre-set time period manually or automatically; a controller 7 mounted on the valve body 1 for controlling the electrically operated relief valve 6; and a self-regulating valve 8 resiliently mounted in an outlet pipe 12 of the flush valve.

#The flush valve of the present invention may be provided for flushing a toilet, a urinal, a sprinkler or water-spraying system or any plumbing systems automatically or manually, not limited in the present invention.

#The valve body 1 includes: an outer barrel 10 connected with an inlet pipe 11 for supplying water W therein; an outlet pipe 12 having a listed atmospheric vacuum breaker 13 formed on the outlet pipe 12; an inner barrel 14 disposed within the outer barrel 10 having an inlet port 101 defined between the inner and outer barrels 14, 10 and communicated with the inlet pipe 11; an upper cover 15 secured on an upper portion of the outer barrel 10 having the diaphragm valve 2 formed between the upper cover 15 and the inner and outer barrels 14, 10; an upper chamber 16 defined between the diaphragm valve 2 and the limit valve 4; an uppermost chamber 17 defined between the limit valve 4 and the upper cover 15; a top housing 18 secured on a top portion of the valve body 1 above the upper cover 15 for mounting the manual relief valve 5, the electrically operated relief valve 6 and the controller 7 in the top housing 18; and a relief port 19 annularly formed in a peripheral portion of the outer barrel 10 fludically communicated with the uppermost chamber 17 through the manual relief valve 5 and the electrically operated relief valve 6 and having a discharge passage 191 connected between the relief port 19 and the outlet pipe 12.