Patents by Inventor Rajesh Krithivasan
Rajesh Krithivasan has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
-
Patent number: 11971111Abstract: A pressure relief valve includes the following features. A housing defines an inlet and an outlet. The housing defines a flow passage between the inlet and the outlet. A seat can be defined by the housing. The seat defines a throat flow area. A plunger is configured to rest upon the seat. The plunger blocks the flow passage when in a closed position. The plunger is configured to actuate between a fully open position and the closed position. The plunger and the seat can at least partially defining a curtain flow area. A bias directs the plunger towards the seat. A ratio of the throat flow area to the curtain flow area is sized for sonic or supersonic flow velocities during critical flow conditions and subsonic velocities during subcritical flow conditions.Type: GrantFiled: October 7, 2022Date of Patent: April 30, 2024Assignee: Dresser, LLCInventors: Rajesh Krithivasan, Richard Klimas
-
Patent number: 11959557Abstract: An evacuation unit is configured to remove entrapped fluid from a flow control. These configurations may incorporate devices that can passively discharge fluid in response to loss of system pressure. These devices may use gravity or spring-assist as mechanisms to move fluid out of spaces in the device. This feature mitigates risks that the entrapped fluid freezes and expands, which can cause damage to metal components and lead to extensive downtime of process lines. As an added benefit, the features can reduce product costs or complexity because the proposed designs avoid the need for additional, peripheral “accessories,” like pumps or heating elements, resident at the location of the flow control.Type: GrantFiled: August 31, 2022Date of Patent: April 16, 2024Assignee: Dresser, LLCInventors: Rajesh Krithivasan, Richard John Klimas, Jr., Jason Glen Knudson
-
Publication number: 20240117890Abstract: A pressure relief valve includes the following features. A housing defines an inlet and an outlet. The housing defines a flow passage between the inlet and the outlet. A seat can be defined by the housing. The seat defines a throat flow area. A plunger is configured to rest upon the seat. The plunger blocks the flow passage when in a closed position. The plunger is configured to actuate between a fully open position and the closed position. The plunger and the seat can at least partially defining a curtain flow area. A bias directs the plunger towards the seat. A ratio of the throat flow area to the curtain flow area is sized for sonic or supersonic flow velocities during critical flow conditions and subsonic velocities during subcritical flow conditions.Type: ApplicationFiled: October 7, 2022Publication date: April 11, 2024Inventors: Rajesh Krithivasan, Richard Klimas
-
Publication number: 20240068586Abstract: An evacuation unit is configured to remove entrapped fluid from a flow control. These configurations may incorporate devices that can passively discharge fluid in response to loss of system pressure. These devices may use gravity or spring-assist as mechanisms to move fluid out of spaces in the device. This feature mitigates risks that the entrapped fluid freezes and expands, which can cause damage to metal components and lead to extensive downtime of process lines. As an added benefit, the features can reduce product costs or complexity because the proposed designs avoid the need for additional, peripheral “accessories,” like pumps or heating elements, resident at the location of the flow control.Type: ApplicationFiled: August 31, 2022Publication date: February 29, 2024Inventors: Rajesh Krithivasan, Richard John Klimas, JR., Jason Glen Knudson
-
Publication number: 20220349491Abstract: Systems, devices, and methods of modulating a pressure relief valve are provided. A modulating pilot valve assembly can receive an inlet pressure of an inlet of a pressure relief valve and can receive a dome area pressure of a dome area of the pressure relief valve. The modulating pilot valve assembly and the pressure relief valve can be configured to maintain a leak-tight seal until reaching a pilot valve pressure set point, at which the modulating pilot valve assembly instantly reduces the dome area pressure instantly, via a biasing mechanism of the modulating pilot valve assembly causing the pressure relief valve to initially open and thereafter to progressively reduce the dome area pressure in proportion to an increase in the inlet pressure and to cause the pressure relief valve to open in proportion to the increase in the inlet pressure.Type: ApplicationFiled: April 29, 2021Publication date: November 3, 2022Inventor: Rajesh Krithivasan
-
Publication number: 20220349486Abstract: Systems, devices, and methods of modulating a pressure relief valve are provided. A modulating pilot valve assembly can receive an inlet pressure of an inlet of a pressure relief valve and can receive a dome area pressure of a dome area of the pressure relief valve. The modulating pilot valve assembly and the pressure relief valve can be configured to maintain a leak-tight seal until reaching a pilot valve pressure set point, at which the modulating pilot valve assembly instantly reduces the dome area pressure instantly, via a biasing mechanism of the modulating pilot valve assembly causing the pressure relief valve to initially open and thereafter to progressively reduce the dome area pressure in proportion to an increase in the inlet pressure and to cause the pressure relief valve to open in proportion to the increase in the inlet pressure.Type: ApplicationFiled: April 29, 2021Publication date: November 3, 2022Inventor: Rajesh Krithivasan
-
Patent number: 11306838Abstract: A pilot-operated pressure relief valve nozzle assembly and associated systems and methods are provided. In an exemplary embodiment, the nozzle assembly includes a body having an elongate shaft with an inner lumen extending therein and a flange at one end of the elongate shaft and having an annular notch formed therein. The annular notch is configured to seat an annular ring, and the annular notch includes an annular groove formed therein that enables communication between a first bore extending through the flange from the inner lumen to the annular groove and a second bore extending through the annular ring, thus allow the first and second bores to be radially offset from one another.Type: GrantFiled: March 27, 2020Date of Patent: April 19, 2022Assignee: DRESSER, LLCInventors: Richard J. Klimas, Jr., Rajesh Krithivasan, Orie Woodman Van Doran, Vigneshwar Shaliwan Wali
-
Publication number: 20210301935Abstract: A pilot-operated pressure relief valve nozzle assembly and associated systems and methods are provided. In an exemplary embodiment, the nozzle assembly includes a body having an elongate shaft with an inner lumen extending therein and a flange at one end of the elongate shaft and having an annular notch formed therein. The annular notch is configured to seat an annular ring, and the annular notch includes an annular groove formed therein that enables communication between a first bore extending through the flange from the inner lumen to the annular groove and a second bore extending through the annular ring, thus allow the first and second bores to be radially offset from one another.Type: ApplicationFiled: March 27, 2020Publication date: September 30, 2021Inventors: Richard J. Klimas, JR., Rajesh Krithivasan, Orie Woodman Van Doran, Vigneshwar Shaliwan Wali
-
Patent number: 10641668Abstract: A safety valve is outfit with sensors to monitor performance. The safety valve may include valve mechanics comprising a closure component moveable relative to a seat. The device may also have a pre-load unit coupled with the closure component. The pre-load unit may utilize a coiled compression spring to generate spring force to keep the closure component in contact with the seat. A strain gauge may be disposed on the compression spring to measure strain, for example, shear strain in the compression spring. Analysis of this data may predict set pressure (or “set point”). This prediction may, in turn, form a basis for an alert or other indicator that the safety valve requires maintenance or repair.Type: GrantFiled: January 23, 2018Date of Patent: May 5, 2020Assignee: Dresser, LLCInventors: Roger Dale Danzy, Rajesh Krithivasan
-
Patent number: 10480696Abstract: A locking collar quick union connection comprises a split ring and a locking collar sub assembly. The locking collar sub assembly includes a collar, a locking ring, and a locking screw. The locking ring includes outer threads that engage inner threads formed on a larger inner diameter portion of the collar. The split ring includes outer threads that engage inner threads formed on a smaller inner diameter portion of the collar. The locking screw rotationally locks the locking ring to the locking collar.Type: GrantFiled: December 1, 2015Date of Patent: November 19, 2019Assignee: FORUM US, INC.Inventors: Douglas Brian Leeth, Roger Lane Suter, Rajesh Krithivasan, Joseph David Gober
-
Publication number: 20190226926Abstract: A safety valve is outfit with sensors to monitor performance. The safety valve may include valve mechanics comprising a closure component moveable relative to a seat. The device may also have a pre-load unit coupled with the closure component. The pre-load unit may utilize a coiled compression spring to generate spring force to keep the closure component in contact with the seat. A strain gauge may be disposed on the compression spring to measure strain, for example, shear strain in the compression spring. Analysis of this data may predict set pressure (or “set point”). This prediction may, in turn, form a basis for an alert or other indicator that the safety valve requires maintenance or repair.Type: ApplicationFiled: January 23, 2018Publication date: July 25, 2019Inventors: Roger Dale Danzy, Rajesh Krithivasan
-
Publication number: 20170152978Abstract: A locking collar quick union connection comprises a split ring and a locking collar sub assembly. The locking collar sub assembly includes a collar, a locking ring, and a locking screw. The locking ring includes outer threads that engage inner threads formed on a larger inner diameter portion of the collar. The split ring includes outer threads that engage inner threads formed on a smaller inner diameter portion of the collar. The locking screw rotationally locks the locking ring to the locking collar.Type: ApplicationFiled: December 1, 2015Publication date: June 1, 2017Inventors: Douglas Brian LEETH, Roger Lane SUTER, Rajesh KRITHIVASAN, Joseph David GOBER
-
Patent number: 9273788Abstract: A pressure relief valve for cryogenic service includes: a fluid inlet and a fluid outlet; a nozzle disposed within the fluid inlet, said nozzle having a nozzle groove radially formed on an exterior cylindrical surface of the nozzle and an outwardly disposed ledge having a lower ledge surface comprising a portion of an exterior surface of the nozzle groove and an upper ledge surface comprising a seat; a substantially cylindrical closure disc with a lower portion including a groove formed on an exterior radial surface of the cylindrical body, an outwardly disposed lip having an upper surface comprising a portion of an interior surface of the groove, said lip of the closure disc having a lower closure surface. The lip of the closure disc being adapted to deflect downward and inward in response to a cryogenic thermal gradient applied across the lip.Type: GrantFiled: July 3, 2013Date of Patent: March 1, 2016Assignee: Dresser, Inc.Inventor: Rajesh Krithivasan
-
Publication number: 20140000728Abstract: A pressure relief valve for cryogenic service includes: a fluid inlet and a fluid outlet; a nozzle disposed within the fluid inlet, said nozzle having a nozzle groove radially formed on an exterior cylindrical surface of the nozzle and an outwardly disposed ledge having a lower ledge surface comprising a portion of an exterior surface of the nozzle groove and an upper ledge surface comprising a seat; a substantially cylindrical closure disc with a lower portion including a groove formed on an exterior radial surface of the cylindrical body, an outwardly disposed lip having an upper surface comprising a portion of an interior surface of the groove, said lip of the closure disc having a lower closure surface. The lip of the closure disc being adapted to deflect downward and inward in response to a cryogenic thermal gradient applied across the lip.Type: ApplicationFiled: July 3, 2013Publication date: January 2, 2014Applicant: DRESSER INC.Inventor: Rajesh Krithivasan
-
Patent number: 8505572Abstract: A pressure relief valve for cryogenic service includes: a fluid inlet and a fluid outlet; a nozzle disposed within the fluid inlet, said nozzle having a nozzle groove radially formed on an exterior cylindrical surface of the nozzle and an outwardly disposed ledge having a lower ledge surface comprising a portion of an exterior surface of the nozzle groove and an upper ledge surface comprising a seat; a substantially cylindrical closure disc with a lower portion including a groove formed on an exterior radial surface of the cylindrical body, an outwardly disposed lip having an upper surface comprising a portion of an interior surface of the groove, said lip of the closure disc having a lower closure surface. The lip of the closure disc being adapted to deflect downward and inward in response to a cryogenic thermal gradient applied across the lip.Type: GrantFiled: December 29, 2010Date of Patent: August 13, 2013Assignee: Dresser Inc.Inventor: Rajesh Krithivasan
-
Publication number: 20120167992Abstract: A pressure relief valve for cryogenic service includes: a fluid inlet and a fluid outlet; a nozzle disposed within the fluid inlet, said nozzle having a nozzle groove radially formed on an exterior cylindrical surface of the nozzle and an outwardly disposed ledge having a lower ledge surface comprising a portion of an exterior surface of the nozzle groove and an upper ledge surface comprising a seat; a substantially cylindrical closure disc with a lower portion including a groove formed on an exterior radial surface of the cylindrical body, an outwardly disposed lip having an upper surface comprising a portion of an interior surface of the groove, said lip of the closure disc having a lower closure surface. The lip of the closure disc being adapted to deflect downward and inward in response to a cryogenic thermal gradient applied across the lip.Type: ApplicationFiled: December 29, 2010Publication date: July 5, 2012Inventor: Rajesh Krithivasan
-
Patent number: D987032Type: GrantFiled: March 27, 2020Date of Patent: May 23, 2023Assignee: Dresser, LLCInventors: Richard J. Klimas, Rajesh Krithivasan, Orie Woodman Van Doran, Vigneshwar Shaliwan Wali