Liquid purification or separation – Flow – fluid pressure or material level – responsive – Discharge of treated material
Patent
1987-04-20
1989-02-28
Castel, Benoit
Liquid purification or separation
Flow, fluid pressure or material level, responsive
Discharge of treated material
210136, 2102572, 137109, B01D 1300, C02F 144
Patent
active
048083020
ABSTRACT:
The present invention comprises improvements in the design of a control valve for a reverse osmosis water purifier system that prevents the unstable oscillations and waste water leakage exhibited by control valves of the prior art. To eliminate the unstable oscillations caused in prior art valves by back pressure in the pure water delivery line of the purifier system, the present invention incorporates the improvement of an additional hydraulic passage from the squeeze water outlet of the control valve to the back of the control valve's pilot valve diaphragm. The back pressure maintained on the pilot diaphragm by the squeeze water acts as a dampening force preventing the closure of the pilot valve, and hence the adjacent squeeze valve, as a result of back pressure built up in the pure water delivery line during dispensing. A second improvement consists of changing the interconnection between the control valve's diverter valve, drain, and back pressure area of the pilot diaphragm such that the back pressure on the diaphragm can drain away only when the diverter valve is opened in response to the pressure attained in the pure water delivery line when the spigot is closed. In the prior art valves the drain line was connected directly to the back pressure area of the pilot diaphragm.
In another embodiment of the invention, a piston and matching seat is used to replace the diaphragm of the pilot valve.
REFERENCES:
patent: 3794173 (1974-02-01), Bray
patent: 4021343 (1977-03-01), Tyler
patent: 4176063 (1979-11-01), Tyler
patent: 4391712 (1983-07-01), Tyler et al.
patent: 4482456 (1984-11-01), Grayson
patent: 4585554 (1986-04-01), Burrows
patent: 4604194 (1986-08-01), Entingh
Castel Benoit
Jordan Richard D.
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