Roger Dale Danzy
Engineering at Pearce Rd, Pineville, LA

5174321, Dec 29, 1992

Feb 4, 1992

7/830986

Roger D. Danzy - Pineville LA

Dresser Industries, Inc. - Dallas TX

G05D 1610

137 14

A testing system for a pilot operated, pressure relief valve of the type wherein movement of the pilot in response to a predetermined line pressure effects the opening of the pressure relief valve comprising a portable apparatus including a source of test fluid pressure, a flow regulating test valve connected to the test pressure source and a piston in the test valve movable in response to the rate of fluid flow through the test valve. The output end of the test valve is connected to a two branch line, one branch line connecting the test valve to the inlet passage of the pilot and the other branch line connecting the test valve to a trapped fluid pressure chamber of the relief valve which is vented by the opening movement of the pilot. A pressure gauge is also connected to the test valve and a plunger on the piston effects the isolation of the pressure gauge when the piston is moved by the increased flow produced through the test valve by the opening of the pilot.

5515884, May 14, 1996

May 18, 1994

8/245475

Roger D. Danzy - Pineville LA
John E. Fain - Pineville LA

Dresser Industries Inc. - Dallas TX

F16K 1708

137478

A safety valve for relieving excessive pressure in a fluid system including a valve body having a central chamber, a discharge flow nozzle connected into the chamber having a valve seat on the end of the flow nozzle in the chamber, a valve disc movably mounted in the chamber for movement between a closed position on the nozzle seat and an open position spaced from the nozzle seat, a valve disc holder connected with the valve disc having a deflecting rim circumscribing the valve disc seat provided with an internal outwardly divergent annular deflecting surface, a blowdown ring mounted on the nozzle having an inner ring portion provided with an outer frustoconical deflecting surface substantially parallel with and spaced from the valve disc holder deflecting surface, the blowdown ring including an outer cylindrical rim provided with circumferentially spaced semi-elliptical discharge ports and an internal cylindrical surface substantially parallel with and spaced from the outer cylindrical surface of the valve disc holder, and a spring connected with the valve disc holder for biasing the valve disc holder and valve disc closed. The blowdown ring is adjustable for changing the blowdown of the valve. The configuration of the valve disc holder and the blowdown ring deflecting surfaces provides chatter free operation.

2011030, Dec 8, 2011

Aug 11, 2011

13/207654

Roger Dale Danzy - Pineville LA, US

Dresser, Inc. - Addison TX

G06F 19/00

702 50

Techniques for monitoring operation of a relief valve containing an internal flow passage with a valve seat and valve plug disposed therein. The temperature of a fluid is sensed in the internal flow passage downstream of the seat. A valve temperature signal is generated representative of the temperature. The valve temperature signal is monitored to detect a rate of change in the temperature. The internal pressure of an inlet pressure line is sensed, connected to the internal flow passage upstream of the valve seat. A line pressure signal is generated representative of the internal pressure. The line pressure signal is compared against at least one expected line pressure value to determine a line pressure status. Operational status of the pressure relief valve is determined based at least in part on the detected rate of change of the fluid temperature and at least in part on the determined line pressure status.

5623962, Apr 29, 1997

Nov 3, 1995

8/552757

Roger D. Danzy - Pineville LA
George R. Holliday - Charlotte NC

Dresser Industries - Dallas TX

F16K 1708

137469

A pressure relief valve which has a body including first and second openings for connection in a line and an interior wall defining a flow-through passageway extending from the first opening to the second opening. The body further includes a chamber having an inlet port and an outlet, the inlet port providing fluid communication between the chamber and the passageway. A guide is removably secured to the body and defines a bore extending into the chamber and an open-ended portion extending away from the chamber. A spindle is slidably disposed in the bore between a first position in which the port is open and a second position in which the disc seats in and closes the port. In the second position, the face of the disc exposed to the fluid in the passageway is recessed from the internal wall a distance no greater than one half the diameter of the passageway. A retention nut is threadingly secured to a portion of the spindle extending into the open-ended portion of the guide. A spring is disposed in the open-ended portion of the guide and bears on the spindle for biasing the spindle in the first position while fluid pressure is less than a set pressure.

8000909, Aug 16, 2011

May 27, 2009

12/473105

Roger Dale Danzy - Pineville LA, US

Dresser, Inc. - Addison TX

G01L 7/00

702 50

Methods, systems, and programs for monitoring operation of one or more pressure relief valves, each relief valve containing an internal flow passage with a valve seat and valve plug disposed therein. The temperature of a fluid is sensed in the internal flow passage downstream of the valve seat. A valve temperature signal is generated representative of the temperature of the fluid downstream of the valve seat. The valve temperature signal is monitored to detect a rate of change in the temperature of the fluid downstream of the valve seat. The internal pressure of an inlet pressure line is sensed, connected to the internal flow passage upstream of the valve seat. A line pressure signal is generated representative of the internal pressure of the inlet pressure line. The line pressure signal is compared against at least one expected line pressure value to determine a line pressure status. Operational status of the pressure relief valve is determined based at least in part on the detected rate of change of the fluid temperature downstream of the valve seat and at least in part on the determined line pressure status.

5725015, Mar 10, 1998

Apr 29, 1996

8/642024

Michael Andrew Theodos - Alexandria LA
Roger Dale Danzy - Pineville LA

Dresser Industries, Inc. - Dallas TX

F16K 31124

137488

An assembly and method for controlling the opening of a safety relief valve exposed to a system fluid pressure and containing a control fluid which controls the opening of the safety relief valve. The assembly includes a pilot valve connected to the safety relief valve and adapted to respond to a predetermined pressure of the system fluid for permitting flow of the control fluid. A regulator receives the control fluid and operates to reduce the pressure of the control fluid a predetermined amount. The safety relief valve opens in response to the reduction of the control fluid pressure, and the remaining control fluid pressure modulates the opening of the safety relief valve.

4848729, Jul 18, 1989

Feb 1, 1988

7/151293

Roger D. Danzy - Pineville LA

Dresser Industries, Inc. - Dallas TX

F16K 146

251332

An improved valve seal is provided which utilizes a c-shaped secondary seal. The c-shaped seal is positioned between the valve disc and the valve seat. A retainer locates the c-shaped seal with respect to the disc, retains the seal against the disc and provides a pre-load on the seal as required.