DUAL TRIM VALVE CARTRIDGE AND SYSTEM
A valve system having a dual trim valve assembly capable of using a single valve assembly to provide fuel in a plurality of modes for at least a main burner operation mode and a parallel pilot operation mode.
The present invention relates to valve cartridges and valve assemblies used in conjunction with combustion applications used at oil and gas well sites, namely valves for control of fuel to main burners and pilots. More specifically, the present invention relates to a valve cartridge and assembly having dual trim capabilities for controlling the flow of main burner and pilot fuel.
BACKGROUNDCombustion applications are commonly used in association with oil and gas well sites for heater tanks, separators, treatment systems, amine re-boilers, and line heaters. Fuel being supplied to a combustion application is commonly channeled through a series of valves before the fuel reaches the combustion site. This series of valves may be referred to as a valve train.
Valve trains may include a number of components such as Y-strainers, regulators, safety shut-off valves, one or more control valves, gauges, manual shut-off valves, and various pressure sensors, pressure switches, and test points. A burner management system is commonly used for managing or controlling certain functions of combustion applications, including valve and valve assembly functions.
The valves and valve assemblies in the valve train are often used for controlling or directing the fuel to the combustion application, regulating gas pressure, regulating temperature at the combustion site, and controlling fuel flow. A control valve is an important part of the burner management system because it can be used to regulate fuel flow in response to changes in fuel pressure or changes in temperature levels at the combustion site. A pilot valve is also an important part of the burner management system because it can be used to regulate fuel pressure and control fuel flow appropriate for pilot and slip stream functions.
There are a number of disadvantages to valve train assembly, installation, and repair practices historically used at oil and gas well sites. One disadvantage is the large number of different parts that a serviceman must have onsite to assemble a valve train or have available when repairs are needed. Valve train configurations can vary widely depending on the applicable code-compliance, cost-sensitivity, and needs of the user. In particular, installation and configuration needs for control and pilot valves within a valve train may vary depending on needs of the user generally requiring independent installation and configuration of a control valve and a pilot valve. The position and configuration of control valves and pilot valves may vary depending on whether a burner application will be configured for slip stream or external pilot functions. The varying, separate and independent configurations of pilot and control valves may result in increased parts and labor for assembling valve trains and may result in more complex componentry for diagnostics and diagnostic procedures.
Thus, it is desirable to have an improved control valve and pilot valve assembly and system that is more compact in size, simple in construction and electrical connections, and makes assembly, diagnostic procedures, and control simpler to effectuate.
SUMMARY OF THE INVENTIONIt is an object of the present invention to provide an improved valve system for a combustion application. It is also an object of the present invention to provide an improved valve assembly for a valve system. It is yet another object of the present invention to provide an improved valve cartridge for a valve assembly.
According to one aspect of the invention a, valve assembly is provided having both control valve and pilot valve functionality. The valve assembly can include a dual trim valve cartridge which has a first trim assembly for control of fuel to a main burner and a second trim assembly for control of bypass fuel which may be directed to a pilot or through a slip stream configuration. The dual trim valve assembly can include a main body, the main body having both an inlet and one or more outlets. Within the main body there can be provided a first main valve control seat located as well as a second bypass valve seat. A main control plug can further be positioned within the main body and can be configured to selectively seal against the first main valve control seat for operation in a main burner supply mode which selectively opens or closes a main fluidic channel connecting the inlet to at least one outlet. A bypass control plug can be positioned within the main body and configured to seal against the first main valve control seat so as to selectively provide gas in a pilot supply mode which selectively opens or closes a bypass fluidic channel being separate and distinct from the main fluidic channel.
The dual trim valve can include a seat cartridge containing the first main valve control seat disposed within a perimeter portion of the seat cartridge, the seat cartridge also containing the second bypass valve control seat about a central portion.
The dual trim valve can also include a stem assembly having a stem shaft, wherein the bypass fluidic channel passing through a central portion of the stem shaft wherein the bypass control plug is situated about a distal end of the stem shaft and is configured to seal against the second bypass control seat within the main body so as to selectively seal the bypass fluidic channel by axially translating the stem shaft. The stem assembly can further include first and second stops provided along an outer circumference of the stem shaft at different axial heights, wherein the main control plug is slidingly engaged about an outer circumference of the stem shaft. The main control plug can be disposed between the first and second stops, wherein movement of the stem shaft in an axial direction causes the first stop to engage the main control plug and push the main control plug out of the first main valve control seat allowing for fluid communication through the main fluidic channel, and wherein movement of the stem in an opposing axial direction causes the second stop to engage the main control plug and push the main control plug into the first main valve control seat restricting or sealing fluid communication through the main fluidic channel.
The dual trim valve can further include a bonnet cartridge having a central aperture configured to receive a proximal end of the stem shaft, the bonnet cartridge being engageable with an interior portion of the main body. A spring can then be provided between the main control plug and the bonnet cartridge so as to abut against an interior portion of the bonnet cartridge and abut against the main control plug thus biasing the main control plug into the first main valve control seat.
In yet other aspects of the present invention, the invention can include various systems which utilize the dual trim control valve which operate in slipstream configurations and parallel pilot configurations, as well as methods of using the dual trim valve assembly and various related systems and configurations.
These and other aspects of the present invention are realized in various valve systems as shown and described in the following figures and related description.
Various embodiments of the present invention are shown and described in reference to the numbered drawings wherein:
It will be appreciated that the drawings are illustrative and not limiting of the scope of the invention which is defined by the appended claims. The embodiments shown accomplish various aspects and objects of the invention. It is appreciated that it is not possible to clearly show each element and aspect of the invention in a single figure, and as such, multiple figures are presented to separately illustrate the various details of the invention in greater clarity. Similarly, not every embodiment need accomplish all advantages of the present invention.
DETAILED DESCRIPTIONThe invention and accompanying drawings will now be discussed so as to enable one skilled in the art to practice the present invention. The drawings and descriptions are exemplary of various aspects of the invention and are not intended to narrow the scope of the appended claims.
Turning now to
It will be appreciated that pilots typically operate at a lower pressure than the main gas supply, e.g., at about 5 psi versus the main gas supply which may operate at about 20 psi. The pilot regulator 40 being located on the bypass gas flow line 50 so as to regulate the pressure for the reduced power slipstream configuration or the parallel pilot configuration as necessary to operate the burner/pilot from the main supply and associated pressure.
The main body 120 can also be provided with a main outlet 118 which supplies gas to a main burner (not shown), as well as with a bypass outlet (not shown) which can be configured to exit from the seat cartridge 300.
The main body 110 can also be provided with an inlet pressure port 122 which provides access, or a potential fluidic channel which is upstream from any valve control within the dual trim valve 100. Additionally, the main body 110 can also be provided with an outlet pressure port 126 which provides access, or a potential fluidic channel which is downstream from any valve control within the dual trim valve 100. The slipstream configuration, as discussed with reference to
This configuration also illustrates how in the sealed configuration the main control plug 450 is seated into the main valve control seat 334 and thus seals and prohibits the flow of gas from the inlet 114 to the outlet 118. The spring 230 can aide in providing a sealing force pushing against bonnet cartridge 200 thus pushing the main control plug 450 into the main valve control seat 224. The sealing force can be increased by providing a second stop 416 along the outer circumference of the stem shaft 410 above the main control plug 450, which, when pushed down can transfer force from the valve actuator (not shown) into the main control plug 450 and increase the sealing force between the main control plug 450 and main valve control seat 334.
The stem assembly 400 can include a stem shaft 410 having proximal and distal ends. The proximal end being the upper end which protrudes from the main body 120 of the valve assembly 100 and through the bonnet cartridge 200 for connecting to a valve actuator. The stem shaft 410 can be provided with the bypass fluidic channel 444 passing therethrough and out a bottom or distal end of the stem shaft 410. The outer circumference can be provided with various grooves for receiving various seals or components. These channels include a first stop groove 414 configured to receive a first stop 412. This first stop 412 operates to un-seat the main control plug 450 from the main valve control seat (not shown) as discussed above. The channels also include a second stop groove 414 for receiving the second stop 416 which operates to aid in pushing the main control plug 450 into the main valve control seat (not shown). A second seal groove 426 can also be provided and configured to receive a second stem seal 424. The second stem seal operates to seal between the stem shaft 410 and an interior portion of the main control plug 450 as the main control plug slides along the outer surface of the stem shaft 410. This seal prevents fuel/gas from leaking through from the inlet side of the main body to the outlet side of the main body by passing between the main control plug 450 and the stem shaft 410 particularly in the closed configuration.
The stem shaft can also be provided with a first seal groove 422 configured to receive the first stem seal 420. This seal operates to outer circumference of the stem shaft 410 against an interior portion of the seat cartridge. This seal is configured to prevent the flow of gas from the bypass fluidic channel 444 out of the bottom of the stem shaft 410 and into the main outlet portion of the main body.
The main control plug 450 is also provided with a main seal ring groove 454 configured to receive a main plug seal ring 452. The main plug seal ring 452 operates to aide in the sealing of the main control plug 450 against the main valve control seat (not shown). As discussed below, the main valve control seat can be tapered such that the main seal ring 452 contacts the main valve control seat prior to the material forming the body of the main control plug.
The spring 230 is mounted in compression between the bottom surface of the bonnet cartridge 200 and the main control plug 450 and operates to press press the main control plug 450 downward on the stem shaft 410 so as to bias the main control plug 450 in a downward direction toward the main valve control seat when assembled.
The seat cartridge can further include a lower sealing groove 346 configured to receive a lower cartridge O-ring 350. The lower cartridge O-ring 350 is configured to be drawn up as the threads engage and then seal against an outer portion of the valve's main body thus preventing gas from leaking out of the valve. The seat cartridge can also include an upper sealing groove 348 configured to receive an upper cartridge O-ring 352. The upper cartridge O-ring 352 is configured to seal the outer circumference of the seat cartridge against an interior surface of the valve main body so as to seal an inlet portion of the main body from the outlet portion of the main body and prevent gas from leaking around the seat cartridge, particularly in the closed configuration. It will also be appreciated that the downward force of the main control plug into the tapered surface of the main valve control seat can operate to provide a radial seal by compressing the main plug seal ring 452 against the interior surface of the main valve control seat 334.
The seat cartridge 300 can include a second bypass valve control seat 370 located at a lower and central portion of the seat cartridge body 310. The bypass valve control seat 370 can also include a bypass seat seal, which can be provided as a rubber or fibrous disc which operates to seal about the tip of the distal end of the stem shaft thus sealing any flow from passing through the bypass fluidic channel. When opened, i.e. when the stem shaft is pulled upward, fuel/gas can flow into the chamber created between the seat cartridge and the stem shaft and then flow out of the cartridge bypass channel 374. The cartridge bypass channel 374 can include a plurality of channels which can be configured to exit through a bottom end of the seat cartridge body 310. It will be appreciated that the seat cartridge body 310 can be provided with a female threaded portion about where the cartridge bypass channel 374 exits the seat cartridge body 310 such that necessary piping can carry the fuel/gas to a necessary downstream points, i.e. to a regulator and then to a parallel pilot, or back into the main gas supply for the slipstream configuration.
The above description is merely illustrative. Having thus described several aspects of at least one embodiment of this invention including the preferred embodiment, it is to be appreciated that various alterations, modifications, and improvements will readily occur to those skilled in the art. Such alterations, modifications, and improvements are intended to be part of this disclosure, and are intended to be within the spirit and scope of the invention. Accordingly, the foregoing description and drawing are by way of example only.
Claims
1. A dual trim valve apparatus, the apparatus comprising:
- a main body having an inlet and one or more outlets;
- a first main valve control seat located within the main body;
- a second bypass valve control seat also located within the main body;
- a main control plug positioned within the main body and configured to selectively seal against the first main valve control seat;
- a bypass control plug positioned within the main body and configured to seal against the first main valve control seat;
- a main fluidic channel connecting the inlet to at least one outlet, the main fluidic channel providing fluid communication between the inlet and the at least one outlet, the main fluidic channel being sealed when the main control plug is sealed against the first main valve control seat; and
- a bypass fluidic channel connecting the inlet to at least one outlet, the bypass fluidic channel providing fluid communication between the inlet and the at least one outlet, the bypass fluidic channel being configured to selectively seal when the bypass control plug is sealed against the second bypass valve control seat.
2. The apparatus of claim 1, further comprising:
- a seat cartridge containing the first main valve control seat disposed within a perimeter portion of the seat cartridge, the seat cartridge also containing the second bypass valve control seat about a central portion, the seat cartridge being engageable with an interior portion of the main body.
3. The apparatus of claim 2, wherein the seat cartridge further includes at least one fluidic channel configured to provide fluid communication from the bypass fluidic channel to an exterior portion of the seat cartridge.
4. The apparatus of claim 1, further comprising a stem assembly, the stem assembly further comprising;
- a stem shaft, having the bypass fluidic channel passing through a central portion thereof;
- first and second stops provided along an outer circumference of the stem shaft at different axial heights;
- wherein the bypass control plug is situated about a distal end of the stem shaft and is configured to seal against the second bypass control seat within the main body so as to selectively seal the bypass fluidic channel by axially translating the stem shaft; and
- wherein the main control plug is slidingly engaged about an outer circumference of the stem shaft, the main control plug being disposed between the first and second stops, wherein movement of the stem shaft in an axial direction causes the first stop to engage the main control plug and push the main control plug out of the first main valve control seat allowing for fluid communication through the main fluidic channel, and wherein movement of the stem in an opposing axial direction causes the second stop to engage the main control plug and push the main control plug into the first main valve control seat restricting or sealing fluid communication through the main fluidic channel.
5. The apparatus of claim 4, further comprising:
- a seat cartridge containing the first main valve control seat disposed within a perimeter portion of the seat cartridge, the seat cartridge also containing the second bypass valve control seat about a central portion, the seat cartridge being engageable with an interior portion of the main body.
6. The apparatus of claim 5, further comprising:
- a bonnet cartridge having a central aperture configured to receive a proximal end of the stem shaft, the bonnet cartridge being engageable with an interior portion of the main body; and
- a spring configured to abut against an interior portion of the bonnet cartridge and abut against the main control plug thus biasing the main control plug into the first main valve control seat.
7. The apparatus of claim 6, further comprising:
- an aperture in a sidewall of a central portion of the stem providing fluid communication between the inlet of the valve main body and the bypass fluidic channel passing through a central portion of the stem.
8. The apparatus of claim 5, further comprising:
- an outlet pressure port provided on the valve main body configured to selectively provide access to an interior portion of the outlet of the valve main body; and
- at least one fluidic channel provided within the seat cartridge, the at least one fluidic channel being configured to provide fluid communication from the bypass fluidic channel and into the outlet pressure port, or to an exterior portion of the valve main body.
9. An integrated dual trim burner and pilot valve system, the system comprising:
- a main body having an inlet, a main outlet, and a bypass outlet;
- a first main valve control seat located within the main body;
- a second bypass valve control seat also located within the main body;
- a main control plug positioned within the main body and configured to selectively seal against the first main valve control seat;
- a bypass control plug positioned within the main body and configured to seal against the first main valve control seat;
- a main fluidic channel connecting the inlet to at least one outlet, the main fluidic channel providing fluid communication between the inlet and the at least one outlet, the main fluidic channel being sealed when the main control plug is sealed against the first main valve control seat;
- a bypass fluidic channel connecting the inlet to at least one outlet, the bypass fluidic channel providing fluid communication between the inlet and the at least one outlet, the bypass fluidic channel being configured to selectively seal when the bypass control plug is sealed against the second bypass valve control seat; and
- an actuator configured to selectively open or close both the main fluidic channel and the bypass fluidic channel, the bypass fluidic channel being configured to open independently from the main fluidic channel.
10. The system of claim 9, further comprising:
- a stem assembly, the stem assembly further comprising; a stem shaft, having the bypass fluidic channel passing through a central portion thereof; first and second stops provided along an outer circumference of the stem shaft at different axial heights; wherein the bypass control plug is situated about a distal end of the stem shaft and seal against the second bypass control seat within the main body so as to selectively seal the bypass fluidic channel by axially translating the stem shaft; and wherein the main control plug is slidingly engaged about an outer circumference of the stem shaft, wherein movement of the stem shaft in an axial direction causes the first stop to engage the main control plug and push the main control plug out of the first main valve control seat allowing for fluid communication through the main fluidic channel, and wherein movement of the stem in an opposing axial direction causes the second stop to engage the main control plug and push the main control plug into the first main valve control seat restricting or sealing fluid communication through the main fluidic channel.
11. The system of claim 10, further comprising:
- a seat cartridge containing the first main valve control seat disposed within a perimeter portion of the seat cartridge, the seat cartridge also containing the second bypass valve control seat about a central portion, the seat cartridge being engageable with an interior portion of the main body.
12. The system of claim 11, further comprising:
- a bonnet cartridge having a central aperture configured to receive a proximal end of the stem shaft, the bonnet cartridge being engageable with an interior portion of the main body; and
- a spring configured to abut against an interior portion of the bonnet cartridge and abut against the main control plug thus biasing the main control plug into the first main valve control seat.
13. The system of claim 12, further comprising:
- an aperture in a sidewall of a central portion of the stem providing fluid communication between the inlet of the valve main body and the bypass fluidic channel passing through a central portion of the stem.
14. The system of claim 13, further comprising:
- a burner being connected to the main outlet of the valve main body configured to be operable in a slipstream configuration;
- an outlet pressure port provided on the valve main body configured to selectively provide access to an interior portion of the main outlet the valve main body;
- at least one fluidic channel provided within the seat cartridge being configured to provide fluid communication from the bypass fluidic channel and into the outlet pressure port, or to an exterior portion of the valve main body; and
- a regulator provided downstream of the bypass fluidic channel before the outlet pressure port.
15. The system of claim 13, further comprising:
- an external pilot burner being connected to the bypass outlet;
- at least one fluidic channel provided within the seat cartridge being configured to provide fluid communication from the bypass fluidic channel to the bypass outlet and thus to the parallel pilot burner; and
- a regulator provided downstream of the bypass fluidic channel before the parallel pilot burner.
16. A method of providing fuel to a pilot and burner system using an integrated dual trim burner and pilot valve system, the method comprising:
- providing a valve having an inlet and a main outlet and a bypass outlet, the valve also having a first main valve control seat located within the main body and a second bypass valve control seat also located within the main body, the valve also having a main control plug configured to selectively seal against the first main valve control seat as well as a bypass control plug configured to seal against the first main valve control seat; the valve also having a main fluidic channel connecting the inlet to at least one outlet, the main fluidic channel providing fluid communication between the inlet and the at least one outlet, the main fluidic channel being sealed when the main control plug is sealed against the first main valve control seat; the valve also having a bypass fluidic channel connecting the inlet to at least one outlet, the bypass fluidic channel providing fluid communication between the inlet and the at least one outlet, the bypass fluidic channel being configured to selectively seal when the bypass control plug is sealed against the second bypass valve control seat;
- providing a fluid fuel to the inlet;
- partially actuating the valve by pulling on a proximal end of a stem shaft, thus allowing fluid to pass through the bypass fluidic channel provided through an interior portion of the stem shaft and thus provide fuel to a downstream burner; and
- fully actuating the valve by further pulling on a proximal end of a stem shaft, thus causing a first stop to engage the main control plug and dislodge the main control plug from the first main valve control seat.
17. The method of claim 16, further comprising:
- sealing the main fluidic channel by partially pushing the stem shaft into the valve main body thus allowing a spring to reseat the main control plug into the first main valve control seat; and
- sealing the bypass fluidic channel by pushing the stem shaft such that a force from an actuator provides the force to cause the bypass control plug to engage and seal against the second bypass valve control seat.
18. The method of claim 16, further comprising:
- regulating the pressure of the fluid fuel passing through the bypass fluidic channel and to the downstream burner using a regulator provided between the bypass fluidic channel and the downstream burner.
19. The method of claim 18, further comprising:
- wherein the fluid fuel is provided to the inlet at a pressure between 15 and 35 psi; and
- regulating the pressure provided to the downstream burner to between 3 and 6 psi using the regulator provided between the bypass fluidic channel and the downstream burner.
20. The method of claim 18, further comprising:
- wherein the downstream burner is a main burner and the pilot bypass fluidic channel is configured to operate a burner in a slipstream configuration; and
- reintroducing fluid fuel flowing through the bypass fluidic channel into the main outlet so as to feed fuel to the main burner.
21. The method of claim 18, further comprising:
- wherein the downstream burner is an external pilot burner and the pilot bypass fluidic channel is configured to operate a burner in an external pilot configuration.
22. A dual trim valve cartridge comprising:
- a bonnet cartridge configured for receiving a stem assembly;
- a stem assembly having a first plug and a second plug; and
- a seat cartridge having a first seat and a second seat;
- wherein the first plug is configured to operatively engage the first seat and the second plug is configured to operatively engage the second seat.
23. The valve cartridge of claim 22, wherein the stem assembly includes a stem shaft, the stem shaft having a bypass fluidic channel passing through a central portion of the stem shaft.
24. The valve cartridge of claim 23, wherein the stem assembly and the seat cartridge are configured to permit the first plug to independently engage the first seat and the second plug to independently engage the second seat.
25. The valve cartridge of claim 23, wherein the first seat is disposed within the seat cartridge within a perimeter portion of the seat cartridge, and wherein the second seat is disposed within the seat cartridge about a central portion.
26. The valve cartridge of claim 22 further comprising a main body having an inlet and an outlet, wherein the bonnet cartridge and the seat cartridge are engageable within the main body.
Type: Application
Filed: Jul 1, 2015
Publication Date: Jan 5, 2017
Inventors: Mark R. Loveless (Mapleton, UT), Melvin Hal Parks (Pleasant Grove, UT), Justin W. Hatch (Spanish Fork, UT)
Application Number: 14/789,828