Water safety system

• US 5,503,175 A
• Filed: 12/22/1994
• Issued: 04/02/1996
• Est. Priority Date: 12/22/1994
• Status: Expired due to Fees

• Current Assignee: David C.H. Grant, Paul W. Ravilious
• Original Assignee: David C.H. Grant, Paul W. Ravilious
• Inventors: Grant, David C. H., Ravilious, Paul W.
• Primary Examiner(s): Nilson, Robert G.
• Application Number:
  US08/361,541
• Time in Patent Office: 467 Days
• Field of Search: 137/1, 137/456, 137/459, 137/460, 137/624.11, 137/624.12, 200/81.9 M
• US Class Current: 137/1
• CPC Class Codes: E03B 7/071 Arrangement of safety devices in domestic pipe systems, e.g. devices for automatic shut-off
• CPC Class Codes: G01F 1/24 with magnetic or electric coupling to the indicating device
• CPC Class Codes: G01M 3/2807 for pipes G01M3/2892, G01M3/30 take precedence
• CPC Class Codes: G01P 13/002 with electrical coupling to the indicating devices
• CPC Class Codes: Y02A 20/15 Leakage reduction or detection in water storage or distribution
• CPC Class Codes: Y10T 137/0318 Processes
• CPC Class Codes: Y10T 137/7723 Safety cut-off requiring reset
• CPC Class Codes: Y10T 137/7727 Excessive flow cut-off
• CPC Class Codes: Y10T 137/86397 With independent valve controller

Abstract

A water safety valve, system and method for detecting and shutting off water flow due to leaks or breaks in a water line in which the water flow is at a very low rate on the order of three to five fluid ounces per minute but having the capability of passing large flows of three hundred to five hundred times this amount. The system provides an automatic fluid shut off with an over-ride timer with an automatic return to normal operation when a predetermined period has expired. It further allows simple shut off and activation of the system with a single conveniently located control.

Claims

1. A water safety valve for detecting water flow due to leaks or breaks in a water line, comprising;

a) a housing having a top, a bottom and an encompassing side wall;

b) a central axial bore opening at said top and extending from said top toward said bottom and stopping a short distance from said bottom;

c) an inlet port extending into said housing and opening into said central axial bore, said inlet port having a top and bottom;

d) an outlet port in said side wall and opening into said central axial bore, said outlet port having a top and bottom;

e) said outlet port spaced above said inlet port and below said top of said housing;

f) a stop in said central axial bore adjacent said top of said inlet port;

g) said central axial bore being of substantially uniform diameter from the top of said housing to adjacent the top of said inlet port;

h) means for sealing said bore at the top of said housing;

i) a piston of uniform diameter slidable within said central axial bore including a switch actuator, said piston having a top and a bottom and an encompassing side wall;

j) switch means in said housing adjacent said top of said housing and actuatable by said piston;

k) said piston having a length extending from said stop to a distance above said top of said outlet port;

l) said piston when resting on said stop having its top spaced below said means for sealing said bore to form a first chamber between said piston top and said means for sealing said bore and a second chamber between said bottom of said piston and said bottom of said housing;

m) a first fluid by-pass means in said piston extending from the top of said piston and exiting out of said piston side wall above said bottom of said piston and in substantial communication with said outlet port during slidable movement of said piston in said bore for moving fluid from said chamber into said outlet port;

n) said piston having a clearance with said central axis bore of about between 0.003 and 0.006 inches;

o) said piston having a non-switch actuating position at rest on said stop below said switch means, and a switch actuating position adjacent said switch means; and

p) whereby when there is no water flow in said line, said piston will substantially close off said outlet port and when there is minimal water flow in said line, said piston will move upwardly discharging water from said chamber into said first fluid by-pass means and into said outlet port permitting said piston to rise to permit said actuator to actuate said switch means causing said water flow in said line to be shut down.

2. A device as recited in claim 1, wherein:

a) said housing is one piece and generally cylindrical.

3. A device as recited in claim 1, wherein:

a) said inlet port extends into said side wall of said housing.

4. A device as recited in claim 1, wherein:

a) said piston is made of a generally non-corrosive material.

5. A device as recited in claim 4, wherein:

a) said piston is brass.

6. A device as recited in claim 1, further comprising:

a) a water line fitting in each of said inlet and outlet ports.

7. A device as recited in claim 1, wherein:

a) said sealing means including a removable plug.

8. A device as recited in claim 1, wherein:

a) said encompassing side wall of said housing having first and second groves;

b) said first and second groves having a partition therebetween; and

c) said switch means movably mounted to said partition adjacent said top of said housing.

9. A device as recited in claim 8, wherein:

a) said first and second groves each extending from said top of said housing toward said bottom of said housing.

10. A device as recited in claim 1, wherein:

a) said switch means includes a first magnetically operated reed switch.

11. A device as recited in claim 10, wherein:

a) said switch means includes a second magnetically operated reed switch positioned in parallel with said first reed switch.

12. A device as recited in claim 11, wherein:

a) said switch actuator includes a magnet.

13. A device as recited in claim 1, and further comprising:

a) a piston anti-rotational means in said housing.

14. A device as recited in claim 13, wherein:

a) said piston anti-rotational means includes a slot extending from said top of said piston and stopping a short distance from said bottom of said piston; and

b) a pin set in said housing and extending into said central axial bore, said pin engagable with said slot.

15. A device as in claim 1, wherein:

a) said first fluid by-pass means including a slot in said side wall of said piston.

16. A device as recited in claim 1, further comprising:

a) a second by-pass means leading from said second chamber to said outlet port and including an adjustment means for controlling the flow of water through said second by-pass means from said second chamber to said outlet port.

17. A device as recited in claim 16, wherein:

a) said flow control adjustment means includes a needle valve.

18. A device as recited in claim 16, wherein:

a) said side wall of said housing includes an opening for receiving said flow control adjustment means.

19. A water safety system for detecting and shutting off water flow due to leaks or breaks in a water line, comprising:

a) a electro-mechanical first valve connected in the water line having an open and closed position, said first valve, when in said open position permits water to flow through the water line, and when in said closed position prevents water from flowing through the water line;

b) a flow detector having a sensor, said flow detector connected in the water line in series with said first valve for detecting water flow in the water line so that upon water flow detection, said sensor is actuated;

c) an electrical control unit connected to a power supply, said electrical control unit interconnecting said flow detector with said first valve, said control unit responsive to said flow detector detecting water flow;

d) said electrical control unit including a first variable delay timer for delaying for a first preselected period of time the closing of said first valve when said flow detector has detected water flow;

e) said electrical control unit having means for closing said first valve during water flow when said first preselected period has expired; and

f) said electrical control unit including a second variable delay timer for interrupting said first variable delay timer and maintaining said first valve in an open position for a second preselected period of time beyond said first preselected period of time.

20. A system as recited in claim 19, wherein:

a) said electrical control unit including a first reset for resetting said first variable delay timer when said second variable delay timer is activated.

21. A system as recited in claim 20, wherein:

a) said electrical control unit including a second reset for resetting said first variable delay timer when said second preselected period of time of said second variable delay timer has expired.

22. A system as recited in claim 21, further comprising:

a) a third reset for re-opening said first valve and resetting said first variable delay timer.

23. A system as recited in claim 22, further comprising:

a) manually controlled second and third valves, each having open and closed positions, said second and third valves coupled in series with said flow detector and said first valve, said flow detector and said first valve positioned intermediate said second and third valves; and

b) said second and third valves when in said closed position permits the uncoupling and removing of said flow detector and said first valve from the system.

24. A system as recited in claim 23, further comprising:

a) a by-pass water line connected in parallel with said flow detector and said first valve, said by-pass water line having a manually controlled fourth valve connected therein, said forth valve having open and closed positions, so that upon closing said second and third valves and uncoupling and removing said flow detector and said first valve and opening said fourth valve permits water to flow through said by-pass water line.

25. A system as recited in claim 19, further comprising:

a) an backup power supply connected to said electrical control unit.

26. A method for detecting and shutting off water flow due to leaks or breaks in a water line, comprising the steps of:

a) providing an electro-mechanical first valve having open and closed positions, connected in the water line;

b) providing a flow detector connected in the water line in series with the first valve for detecting water flow in the water line, the flow detector having a sensor;

c) providing an electrical control unit for interconnecting the flow detector with the first valve, said control unit responsive to the flow detector detecting water flow in the water line;

d) providing a first variable delay timer in the electrical control unit for delaying for a first preselected period of time the closing of the first valve when said flow detector has detected water flow;

e) providing the electrical control unit with a means for closing the first valve during water flow when said preselected period has expired;

f) opening the first valve to permit water to flow in the water line;

g) detecting water flow in the water line with the flow detector;

h) actuating the sensor in the flow detector;

i) activating the first variable delay timer in the control unit in response to the sensor being actuated;

j) closing the first valve during water flow when the first preselected period has expired to prevent water from flowing in the line; and

k) providing a second delay timer in the electrical control unit for interrupting the first delay timer for maintaining the first valve in an open position for a second preselected period of time beyond the first preselected period of time.