Lawrence M Dulac

US Patent:

6698714, Mar 2, 2004

Filed:

Jul 17, 2001

Appl. No.:

09/907201

Inventors:

Lawrence M. Dulac - Deerfield NH 03037

International Classification:

F16K 5100

US Classification:

251148, 285 2, 137 71, 122504

Abstract:

A fluid safety discharge system for a relief valve having an inlet and an outlet includes a bushing frictionally engaging the relief valve outlet. The relief valve outlet is internally threaded for engaging with a threaded device, such as a discharge line. The bushing may contain a separate body and engagement region for use with hard-plumbed discharge lines. Optionally, an adapter may be used for retrofitting the bushing to an existing relief valve.

US Patent:

6823887, Nov 30, 2004

Filed:

Feb 8, 2002

Appl. No.:

10/071432

Inventors:

Lawrence M. Dulac - Manchester NH 03109

International Classification:

F16K 1700

US Classification:

137334, 137341, 137487, 251 50, 251 54

Abstract:

A water supply shut off system includes a water pressure delay device which delays the transmission of any apparent change in water pressure between the input and the output side of the valve to the control input of the valve. This delay allows the input and output pressures to have a chance to generally equalize without falsely tripping the device. The water supply shut off system can also include a thermal expansion/contraction device that allows thermal expansion and contraction of a fluid medium, such as water, when the shut off device is used with a device to be protected such as a hot water heater.

US Patent:

7117887, Oct 10, 2006

Filed:

Mar 26, 2004

Appl. No.:

10/811108

Inventors:

Lawrence M. Dulac - Deerfield NH, US

International Classification:

F16K 31/12
G05D 16/02

US Classification:

137494, 13750538, 13762417

Abstract:

An apparatus is adapted to be secured to a pressure regulator, relief valve, or any other valve and allows the user to control the position of the valve. According to one embodiment, the pressure regulator remains fully open until a desired maximum fill pressure within a boiler is reached. Upon reaching the maximum fill pressure, the valve is automatically and substantially instantly closed. Consequently, the pressure within the boiler never exceeds the maximum allowable pressure of the pressure relief valve, thereby preventing the accidental discharge of hot, high-pressure water from the boiler. Moreover, because the valve remains fully open until the maximum fill pressure is achieved, the amount of time to fill the boiler is substantially reduced. According to another embodiment, a relief valve remains fully closed until a maximum pressure is exceeded, whereby the valve is substantially instantly fully opened.

US Patent:

20100139789, Jun 10, 2010

Filed:

Dec 4, 2008

Appl. No.:

12/328086

Inventors:

Lawrence M. Dulac - Deerfield NH, US

International Classification:

F16K 15/00

US Classification:

137535

Abstract:

A relief valve comprises a housing having a supply line inlet, for allowing fluid to enter the housing and a fluid supply outlet configured for allowing fluid to exit the housing. The fluid exiting the housing flows proximate and against a valve seat, thereby, flushing the valve seat. The relief valve also includes a relief outlet having an inlet region and an outlet region and a valve mechanism. The valve mechanism includes a valve seat configured for operation between a first, closed position closing the inlet region of the relief outlet inlet region thereby preventing fluid from exiting the relief outlet, and a second, open position opening the inlet region of the relief outlet inlet region, thereby allowing fluid to exit from the housing through the relief outlet.

US Patent:

20110168277, Jul 14, 2011

Filed:

Mar 23, 2011

Appl. No.:

13/069955

Inventors:

Lawrence M. Dulac - Belmont NH, US

Assignee:

Larco LLC - Belmont NH

International Classification:

F16K 17/38
F16K 51/00
F16K 17/04

US Classification:

137468, 251148, 137535

Abstract:

A safety discharge system comprises a pressure relief valve having an inlet, designed to mate with an outlet of a heating appliance, and a relief outlet, wherein at least the inlet of the pressure relief valve and the outlet of the heating appliance include a threaded region, and wherein the threaded region is threaded with a reverse or left handed thread.

US Patent:

60218088, Feb 8, 2000

Filed:

Apr 6, 1998

Appl. No.:

9/055838

Inventors:

Lawrence M. Dulac - Manchester NH

International Classification:

F16K 3112

US Classification:

137487

Abstract:

A water supply shut off valve system is used with a fluid storage tank, such as a hot water heater, to automatically shut off a fluid supply to the storage tank as a result of a pressure drop in the storage tank caused, for example, by a leak or rupture. A fluid supply shut off valve system comprises a shut off valve, such as a normally closed diaphragm valve, coupled to a supply inlet, for controlling the supply of fluid through the supply line to the storage tank. The shut off valve system further comprises a fluid monitoring device (FMD) fluidly coupled to the supply line and to the shut off valve, for monitoring the tank pressure and causing the shut off valve to remain closed when the tank pressure drops to ambient pressure. The FMD generally includes a body portion having a passageway and an actuation mechanism disposed in the passageway for opening and closing a fluid path through the FMD. When the actuation mechanism is in the normally open position, pressure is relieved from the shut off valve through the fluid path, allowing the valve to open and close.