Systems, methods, and apparatus for leak detection and prevention

• US 9,759,345 B2
• Filed: 12/14/2007
• Issued: 09/12/2017
• Est. Priority Date: 12/19/2006
• Status: Active Grant

• Current Assignee: Lalit Savla
• Original Assignee: Lalit Savla
• Inventors: Savla, Lalit
• Primary Examiner(s): CHAUDRY, ATIF H
• Application Number:
  US11/956,564
• Publication Number:
  US 20080143540A1
• Time in Patent Office: 3,560 Days
• Field of Search: 137312, 137 781, 137385, 251228, 251231, 251232, 251248, 251251, 251252, 251 89, 251 92, 251 93, 251114, 340605, 73 407
• CPC Class Codes: F16K 31/02 electric F16K31/004 takes precedence; magnetic
• CPC Class Codes: F16K 31/05 specially adapted for operating hand-operated valves or for combined motor and hand operation
• CPC Class Codes: F16K 31/055 for rotating valves
• CPC Class Codes: F16K 35/06 using a removable actuating or locking member, e.g. a key F16K35/10, F16K35/12 take precedence
• CPC Class Codes: G01M 3/16 using electric detection means G01M3/045, G01M3/06, G01M3/12, G01M3/20, G01M3/24, G01M3/26 take precedence
• CPC Class Codes: G01M 3/18 for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
• CPC Class Codes: Y10T 137/1842 Ambient condition change responsive
• CPC Class Codes: Y10T 137/5762 With leakage or drip collecting
• CPC Class Codes: Y10T 137/7256 Locks against rotary motion

Abstract

A leak detection and prevention system includes a gear motor linkage assembly. The gear motor linkage assembly includes a gear motor and a gear motor controller/driver module that controls operation of the gear motor. The gear motor linkage assembly also includes a push lever attached to a shaft of the gear motor, the push lever in a home position, wherein when a signal indicating that a leak has been detected is received the gear motor controller/driver module controls the gear motor to rotate the push lever so that the push level non-captively engages a handle of a valve and pushes the handle to a closed position, then the gear motor controller/driver module controls the gear motor to rotate the push lever to the home position.

Claims

1. A leak detection and prevention system for coupling to a valve that is manually operable by an attached handle, the system comprising:

a gear motor linkage assembly including a motor and gear box;

a push lever initially in a home position and coupled to a shaft of the motor;

a motor controller/driver module configured to

receive a signal indicating that a leak has been detected,

upon receiving such signal to control the motor to drive the push lever so that the push lever non-captively engages the handle of the valve and pushes the handle to a closed position, and

thereafter to control the motor to return the push lever, disengaging it from the valve handle, to the home position; and

at least one leak detection sensor configured to activate a transmitter that transmits the signal indicating the presence of a leak upon encountering appropriate fluid.

2. The system of claim 1, wherein the leak detection transmitter is a wireless transmitter.

3. The system of claim 1, wherein the valve is a ball valve.

4. The system of claim 1, wherein the valve is a gate valve.

5. The system of claim 1, wherein the valve can be manually operated when the push lever is in the home position.

6. The system of claim 1, wherein the motor controller/driver module is further configured to detect the handle of the valve is in a closed position, including configuration to detect an increase in current to the gear motor.

7. The system of claim 1, wherein the motor controller/driver module is further configured to detect the push lever is in the home position, including configuration to detect an increase in current to the gear motor.

8. The system of claim 1, further comprising a feedback device configured to indicate a position of the handle of the valve.

9. The leak detection and prevention system of claim 1 wherein at least one leak detection sensor comprises a detection circuit configured to measure a resistance between at least two detection probes and to actuate a switch to activate the transmitter when the resistance between the at least two detection probes is below a predetermined value.

10. The leak detection and prevention system of claim 1 wherein at least one leak detection sensor is configured to impose a current drain on a power source only when a leak is detected.

11. A motor controller/driver module for interfacing with a valve that is manually operable by an attached handle, the module comprising:

a motor drive logic module configured to respond to a signal indicating presence of a leak by generating commands to actuate a gear motor to drive a push lever coupled to a shaft of the gear motor from an initial home position to non-captively engage and push the attached handle of the valve in a closing direction, to respond to a first current analysis signal by generating commands to reverse the gear motor direction to drive the push lever toward the home position, and to respond to a second current analysis signal by generating commands to stop the gear motor;

a motor driver module configured to receive the commands and responsively control power to the gear motor to cause the shaft of the gear motor to rotate in suitable directions; and

a current analysis module configured to monitor a level of current supplied to the motor, to provide the first current analysis signal for the motor drive logic module upon detecting a first current spike indicating that the push lever coupled to the gear motor shaft has reached a first stop, and to provide the second current analysis signal for the motor drive logic module upon detecting a second current spike indicating that the push lever coupled to the gear motor shaft has reached a second stop in home position.

12. The motor controller/driver module of claim 11, wherein the signal indicating the presence of a leak is received from a leak detection sensor.

13. The motor controller/driver of claim 11, wherein the push lever non-captively engages a handle of a ball valve.

14. The motor controller/driver of claim 11, wherein the push lever non-captively engages a handle of a gate valve.

15. A valve comprising:

a ball valve with a manually operable handle;

a gear motor;

a motor controller/driver module that controls operation of the motor,

a push lever coupled to a shaft of the motor such that when the motor is suitably driven the push lever non-captively engages and drives the handle of the valve;

a feedback device capable of communicating with the motor controller/driver module to provide an indication of a position of the valve handle enabling the motor controller/driver module to move the valve handle to a desired position.

16. The valve of claim 15, wherein the feedback device is an optical encoder.

17. The valve of claim 15, wherein the feedback device is a potentiometer.