CA1296904C - Injector valve - Google Patents
Injector valveInfo
- Publication number
- CA1296904C CA1296904C CA000579778A CA579778A CA1296904C CA 1296904 C CA1296904 C CA 1296904C CA 000579778 A CA000579778 A CA 000579778A CA 579778 A CA579778 A CA 579778A CA 1296904 C CA1296904 C CA 1296904C
- Authority
- CA
- Canada
- Prior art keywords
- secondary flow
- flow channel
- injection chamber
- injector
- chamber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Abstract
INJECTOR VALVE
ABSTRACT OF THE DISCLOSURE
An injector valve for injecting proportional quantities of a first liquid into a second liquid flowing through the body of the valve which is provided with spaced apart primary and secondary flow channels and with an inlet port and an outlet port common to the flow channels. The secondary flow channel is provided with a Venturi, with a throat generally intermediate the ends thereof. The throat area defines an injection chamber in the form of an annular enclosure coaxial with the secondary flow channel, and with the axial length of the injection chamber being substantially coextensive with that of the Venturi throat. The ratio of the length of the injection chamber to the diameter of the secondary flow channel at points immediately adjacent the ends of the throat is approximately 2:1, while the ratio of the cross-sectional area of the annular chamber to that of the secondary flow channel at the ends of the chamber is approximately 4:1.
ABSTRACT OF THE DISCLOSURE
An injector valve for injecting proportional quantities of a first liquid into a second liquid flowing through the body of the valve which is provided with spaced apart primary and secondary flow channels and with an inlet port and an outlet port common to the flow channels. The secondary flow channel is provided with a Venturi, with a throat generally intermediate the ends thereof. The throat area defines an injection chamber in the form of an annular enclosure coaxial with the secondary flow channel, and with the axial length of the injection chamber being substantially coextensive with that of the Venturi throat. The ratio of the length of the injection chamber to the diameter of the secondary flow channel at points immediately adjacent the ends of the throat is approximately 2:1, while the ratio of the cross-sectional area of the annular chamber to that of the secondary flow channel at the ends of the chamber is approximately 4:1.
Description
1~9~gO4 INJECTOR V~LVE
B~CKGROUND OF T~IR INVENTION
The present invention relates generally to an improved injector valve, and more particularly to an injector valve for injecting a proportional quantity of a first liquid into a second liquid flowin~ through the valve. The injector valve means of the present invention is particularly adapted for injecting small quantities of fluid into a major flow channel, such as injecting high dilution ratios in the range of 150:1. The injector valve means of the present invention is particularly adapted for use with water as the main flow constituent, with the water being maintained at relatively high pressures and high temperatures including temperatures in excess of 200~F., and up to temperatures in the range of 210F. The injector valve of the present invention is particularly adapted for use in combination with systems requiring modest amounts of a fluid to be injected therein at relatively high pressures and temperatures.
In the past, injector valves have been designed which include rather complicated and complex flow means. The preferred technique for injection is to dilute the fluid to be injected into the main flow, to such an extent that relatively high quantities of the fluid to be injected are employed. Such an arrangement contributes to inconvenience in application, particularly when it is desired to use mobile or porta~le pumps and systems, such as portable spray systems or the like.
SUMMARY OF THE INVENTION
The present invention utilizes a conventional valve body, preferably fabricated from stainless steel, with the valve body having main inlet and outlet ports at opposed ends thereof.
Parallel and dual flow channels are provided, with the primary r~
lZ~69Q~
flow cl~nnel beincJ utili~ed to maintain cap~city and pressure, ~nd with tlle secondary flow chanilel being used to introduce a fluid to be injected into the overall stream. The arrangement has been found to be particularly adapted for use with water at relatively elevated temperatures and pressures.
The improvement of the present invention relates essentially to the design of the injection chamber which is utilized in combination with the secondary flow channel. This injector chamber is defined by axially spaced apart first and second inwardly tapered flow channels which converge at their smaller diameter ends to form a modified Venturi arrangement. The Venturi is provided with an open throat zone which is disposed in the region between the converging tapered zones. This open Venturi throat, in turn, defines an injection chamber for introducing the fluid to be injected into the overall stream. The injection chamber is in direct communication with an injection port, with the injectin port providing the third port in the overall valve body.
By way of further definition, the injection chamber is in the form of a generally annular enclosure formed within the valve body, and with the annular enclosure being generally coaxial with the secondary flow channel. The length of the injector chamber is substantially coextensive with that of the throat of the Venturi, and is preferably in the range of approximately two times the diameter of the secondary channel at points immediately adjacent the ends or walls of the injection chamber. Furthermore, the ratio of the cross-sectional area of the annular chamber to that of the secondary flow channel at the edges of the wall defining the injection chamber is approximately 6:1. Preferably, the lZ969~
annulal chamher is concentric with the bore of the channel, although other configurations may be advantageously employed.
In order .o reduce the tendency of the heated water to flash within the valve and to maintain maximum efficiency, the primary flow channel is smooth and free of obstructions.
Furthermore, it is generally of constant diameter from the inlet to the outlet. The secondary channel, as indicated earlier, has tapered portions converging toward the mid-point thereof, with the region between the ends of the converging tapers being spaced apart to form the injector chamber.
In terms of flow pattern, as contrasted to the definition of the valve body, the secondary channel has a diameter or cross-sectional area which converges from the inlet port to the mid-point where it joins the injector chamber, and further has a diverging or increasing cross-sectional diameter from the juncture with the injector chamber and toward the outlet port. As a result of this configuration and design, the valve structure has been found to be well adapted for use when precise high dilution ratios are required, and where water at high temperature and high pressure are being utilized.
Therefore, it is a primary object of the present invention to provide an improved injector valve which is particularly designed to inject fluids in precise quantities and at high dilution ratios, and to function with water at relatively high pressures and temperatures in excess of about 200F.
It is a further object of the present invention to provide an improved injector valve which is designed for injecting a proportional quantity of a first liquid in very precise quantities into a flow of a second liquid where these flow rates are well defined and controlled, and wherein spaced apart distinct primary ~Z9~904 and secondary flow channels are provided, and with the primary flow channel havlng an outer periphery which is substantially smooth and cylindrical, and with the secondary flow channel having an outer periphery which forms a Venturi with an injection chamber at the throat of the Venturi.
Other and further objects of the present invention will become apparent to those skilled in the art upon a study of the following specification, appended claims, and accompanying drawing.
IN THE DRAWING
Figure 1 is an exploded view of an injector valve prepared in accordance with the present invention; and Figure 2 is a vertical sectional view taken along the line and in the direction of the arrows 2-2 of Figure 1.
DESCRIPTION OF THE PREFERRED EMBODIMENT
In accordance with the preferred embodiment of the present invention, and with particular attention being directed to Figures 1 and 2 of the drawing, the injector valve generally designated 10 comprises a valve body 11 having a pair of flow channels extending therethrough, including a primary flow channel 12, and a secondary flow channel 13. Inlet and outlet ports are provided as at 14 and 15, with the ports being in common for the primary and secondary flow channels 12 and 13 respectively. As indicated, inlet and outlet ports 14 and 15 are preferably threaded so as to receive inlet and outlet conduits.
A third port is provided, such as injection port 17.
Injection port 17 may be provided with an adaptor block (not shown) so as to accommodate fittings for the fluid to be injected into the main flow. Conventional screws or cap screws may be employed to attach such an adaptor block to body 11.
lZ~69C~
With attention being redirected to Figure ~ of the drawing, secondary flow channel 13 which extends between inlet 14 and outlet 15 is provided with a pair of hardened stainless steel inserts having inner tapered cores, such as inserts 21 and 22.
The inner ends of the inserts 21 and 22 are in inwardly converging relationship, one to another, forming the continuous secondary flow channel 13, as indicated at 23 and 24. The inwardly convering tapers may be expressed as converging and diverging with respect to the fluid passing therethrough, and thereby forming a Venturi with an open throat area as at 25 therebetween. The open throat æone of the Venturi, as indicated, is disposed in a region between the spaced apart inserts and defines generally an injection chamber. The injection chamber is in direct communication with injection port 17, thereby providing a means of introducing fluid into the secondary flow channel 13 as defined by segments as at 23 and 24.
As indicated, the injection chamber is in the form of a generally annular enclosure, and is preferably arranged coaxially with the secondary flow channel. The injection chamber has an axial length which is, of course, substantially coextensive with the length of the Venturi throat. With respect to the dimensional relationships, the ratio of the cross-sectional area of the annular chamber to that of the secondary flow channel at the smaller end of the tapered area is approximately 10:1.
Furthermore, the ratio of the axial length of the injection chamber to the diameter of the secondary flow channel at the smaller end of the taper is approximately 2:1. By way of design configurations and constraints, it has been found that the ratio of the cross-sectional areas of the annular chamber to that of the secondary flow channel is the more important.
lZ9~04 ~ s has been indicated, the injector valve of the preGent inventioll is preferab]y fabricated from hardened stainless. For most flow arrangements, particularly for a valve deliveriny approximately 4 to 5~ gallons per minute of diluted or working solution at a pressure of approximately 100(, arid 1100 psi at 200F., a diameter for the taper channel .t the converged or smaller end is in the range of approximately 0 035 inch for a flow rate of 4 gpm and 0.040 inch for a flow rate of 5 gpm, it being generally important that this dimension not be exceeded substantially for these design and capacity objectives and goals.
Additionally, it is generally desired that the diameter of the primary jet or primary flow channel be smaller than the diameter of the secondary ~et or secondary flow channel by approximately 0.004 inch.
The primary flow channel, as indicated, is cylindrical and of uniform diameter through its length. Also, it is desired that the surfaces of the primary and secondary flow channels are smooth and free of burrs or other anomalies, and that all entry and discharge ports to the primary flow channel have the radius as specified above. Conformance to these specifications thus reduces or eliminates the tendency of the heated aqueous fluid to flash, particulariy at temperatures of 200F.
It will be appreciated, of course, that those s~illed in the art may depart from the specific design arrangements set forth herein without departing from the spirit and scope of the present invention.
What is claimed is:
B~CKGROUND OF T~IR INVENTION
The present invention relates generally to an improved injector valve, and more particularly to an injector valve for injecting a proportional quantity of a first liquid into a second liquid flowin~ through the valve. The injector valve means of the present invention is particularly adapted for injecting small quantities of fluid into a major flow channel, such as injecting high dilution ratios in the range of 150:1. The injector valve means of the present invention is particularly adapted for use with water as the main flow constituent, with the water being maintained at relatively high pressures and high temperatures including temperatures in excess of 200~F., and up to temperatures in the range of 210F. The injector valve of the present invention is particularly adapted for use in combination with systems requiring modest amounts of a fluid to be injected therein at relatively high pressures and temperatures.
In the past, injector valves have been designed which include rather complicated and complex flow means. The preferred technique for injection is to dilute the fluid to be injected into the main flow, to such an extent that relatively high quantities of the fluid to be injected are employed. Such an arrangement contributes to inconvenience in application, particularly when it is desired to use mobile or porta~le pumps and systems, such as portable spray systems or the like.
SUMMARY OF THE INVENTION
The present invention utilizes a conventional valve body, preferably fabricated from stainless steel, with the valve body having main inlet and outlet ports at opposed ends thereof.
Parallel and dual flow channels are provided, with the primary r~
lZ~69Q~
flow cl~nnel beincJ utili~ed to maintain cap~city and pressure, ~nd with tlle secondary flow chanilel being used to introduce a fluid to be injected into the overall stream. The arrangement has been found to be particularly adapted for use with water at relatively elevated temperatures and pressures.
The improvement of the present invention relates essentially to the design of the injection chamber which is utilized in combination with the secondary flow channel. This injector chamber is defined by axially spaced apart first and second inwardly tapered flow channels which converge at their smaller diameter ends to form a modified Venturi arrangement. The Venturi is provided with an open throat zone which is disposed in the region between the converging tapered zones. This open Venturi throat, in turn, defines an injection chamber for introducing the fluid to be injected into the overall stream. The injection chamber is in direct communication with an injection port, with the injectin port providing the third port in the overall valve body.
By way of further definition, the injection chamber is in the form of a generally annular enclosure formed within the valve body, and with the annular enclosure being generally coaxial with the secondary flow channel. The length of the injector chamber is substantially coextensive with that of the throat of the Venturi, and is preferably in the range of approximately two times the diameter of the secondary channel at points immediately adjacent the ends or walls of the injection chamber. Furthermore, the ratio of the cross-sectional area of the annular chamber to that of the secondary flow channel at the edges of the wall defining the injection chamber is approximately 6:1. Preferably, the lZ969~
annulal chamher is concentric with the bore of the channel, although other configurations may be advantageously employed.
In order .o reduce the tendency of the heated water to flash within the valve and to maintain maximum efficiency, the primary flow channel is smooth and free of obstructions.
Furthermore, it is generally of constant diameter from the inlet to the outlet. The secondary channel, as indicated earlier, has tapered portions converging toward the mid-point thereof, with the region between the ends of the converging tapers being spaced apart to form the injector chamber.
In terms of flow pattern, as contrasted to the definition of the valve body, the secondary channel has a diameter or cross-sectional area which converges from the inlet port to the mid-point where it joins the injector chamber, and further has a diverging or increasing cross-sectional diameter from the juncture with the injector chamber and toward the outlet port. As a result of this configuration and design, the valve structure has been found to be well adapted for use when precise high dilution ratios are required, and where water at high temperature and high pressure are being utilized.
Therefore, it is a primary object of the present invention to provide an improved injector valve which is particularly designed to inject fluids in precise quantities and at high dilution ratios, and to function with water at relatively high pressures and temperatures in excess of about 200F.
It is a further object of the present invention to provide an improved injector valve which is designed for injecting a proportional quantity of a first liquid in very precise quantities into a flow of a second liquid where these flow rates are well defined and controlled, and wherein spaced apart distinct primary ~Z9~904 and secondary flow channels are provided, and with the primary flow channel havlng an outer periphery which is substantially smooth and cylindrical, and with the secondary flow channel having an outer periphery which forms a Venturi with an injection chamber at the throat of the Venturi.
Other and further objects of the present invention will become apparent to those skilled in the art upon a study of the following specification, appended claims, and accompanying drawing.
IN THE DRAWING
Figure 1 is an exploded view of an injector valve prepared in accordance with the present invention; and Figure 2 is a vertical sectional view taken along the line and in the direction of the arrows 2-2 of Figure 1.
DESCRIPTION OF THE PREFERRED EMBODIMENT
In accordance with the preferred embodiment of the present invention, and with particular attention being directed to Figures 1 and 2 of the drawing, the injector valve generally designated 10 comprises a valve body 11 having a pair of flow channels extending therethrough, including a primary flow channel 12, and a secondary flow channel 13. Inlet and outlet ports are provided as at 14 and 15, with the ports being in common for the primary and secondary flow channels 12 and 13 respectively. As indicated, inlet and outlet ports 14 and 15 are preferably threaded so as to receive inlet and outlet conduits.
A third port is provided, such as injection port 17.
Injection port 17 may be provided with an adaptor block (not shown) so as to accommodate fittings for the fluid to be injected into the main flow. Conventional screws or cap screws may be employed to attach such an adaptor block to body 11.
lZ~69C~
With attention being redirected to Figure ~ of the drawing, secondary flow channel 13 which extends between inlet 14 and outlet 15 is provided with a pair of hardened stainless steel inserts having inner tapered cores, such as inserts 21 and 22.
The inner ends of the inserts 21 and 22 are in inwardly converging relationship, one to another, forming the continuous secondary flow channel 13, as indicated at 23 and 24. The inwardly convering tapers may be expressed as converging and diverging with respect to the fluid passing therethrough, and thereby forming a Venturi with an open throat area as at 25 therebetween. The open throat æone of the Venturi, as indicated, is disposed in a region between the spaced apart inserts and defines generally an injection chamber. The injection chamber is in direct communication with injection port 17, thereby providing a means of introducing fluid into the secondary flow channel 13 as defined by segments as at 23 and 24.
As indicated, the injection chamber is in the form of a generally annular enclosure, and is preferably arranged coaxially with the secondary flow channel. The injection chamber has an axial length which is, of course, substantially coextensive with the length of the Venturi throat. With respect to the dimensional relationships, the ratio of the cross-sectional area of the annular chamber to that of the secondary flow channel at the smaller end of the tapered area is approximately 10:1.
Furthermore, the ratio of the axial length of the injection chamber to the diameter of the secondary flow channel at the smaller end of the taper is approximately 2:1. By way of design configurations and constraints, it has been found that the ratio of the cross-sectional areas of the annular chamber to that of the secondary flow channel is the more important.
lZ9~04 ~ s has been indicated, the injector valve of the preGent inventioll is preferab]y fabricated from hardened stainless. For most flow arrangements, particularly for a valve deliveriny approximately 4 to 5~ gallons per minute of diluted or working solution at a pressure of approximately 100(, arid 1100 psi at 200F., a diameter for the taper channel .t the converged or smaller end is in the range of approximately 0 035 inch for a flow rate of 4 gpm and 0.040 inch for a flow rate of 5 gpm, it being generally important that this dimension not be exceeded substantially for these design and capacity objectives and goals.
Additionally, it is generally desired that the diameter of the primary jet or primary flow channel be smaller than the diameter of the secondary ~et or secondary flow channel by approximately 0.004 inch.
The primary flow channel, as indicated, is cylindrical and of uniform diameter through its length. Also, it is desired that the surfaces of the primary and secondary flow channels are smooth and free of burrs or other anomalies, and that all entry and discharge ports to the primary flow channel have the radius as specified above. Conformance to these specifications thus reduces or eliminates the tendency of the heated aqueous fluid to flash, particulariy at temperatures of 200F.
It will be appreciated, of course, that those s~illed in the art may depart from the specific design arrangements set forth herein without departing from the spirit and scope of the present invention.
What is claimed is:
Claims (4)
1. In an injector valve means for injecting a proportional quantity of a first liquid into a second liquid flowing through said valve and comprising a valve body having primary and secondary flow channels extending along the length thereof and with inlet and outlet ports in said valve body common to said flow channels and an injector port in communication with liquid flowing through said secondary flow channel; the improvement comprising:
(a) said secondary flow channel having first and second axially spaced apart diametrical converging zones between said inlet and outlet ports with each converging zone having an inner tapered core, and with the tapers defining a Venturi in said secondary flow channel with an open Venturi throat zone disposed in the region between said diametrical converging zones and defining an injection chamber;
(b) said injection chamber being in direct communication with said injector port; and (c) said injection chamber being in the form of a generally annular enclosure in said valve body arranged coaxially with said secondary flow channel, and with an axial length substantially coextensive with that of said injection chamber.
(a) said secondary flow channel having first and second axially spaced apart diametrical converging zones between said inlet and outlet ports with each converging zone having an inner tapered core, and with the tapers defining a Venturi in said secondary flow channel with an open Venturi throat zone disposed in the region between said diametrical converging zones and defining an injection chamber;
(b) said injection chamber being in direct communication with said injector port; and (c) said injection chamber being in the form of a generally annular enclosure in said valve body arranged coaxially with said secondary flow channel, and with an axial length substantially coextensive with that of said injection chamber.
2. The injector valve means as defined in Claim 1 being particularly characterized in that said first and second diametrical converging zones are formed in first and second inserts respectively lodged in axially spaced apart relationship within said secondary flow channel.
3. The injector valve means as defined in claim 1 being particularly characterized in that the ratio of the cross-sectional area of the annular chamber to that of the secondary flow channel at the smaller end of each of said tapers is approximately 8:1.
4. The injector valve means as defined in Claim 1 being particularly characterized in that the ratio of the length of the injection chamber to the diameter of the secondary flow channel at the smaller end of each of said tapers is approximately 2:1.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US22337188A | 1988-07-25 | 1988-07-25 | |
| US07/223,371 | 1988-07-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1296904C true CA1296904C (en) | 1992-03-10 |
Family
ID=22836233
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000579778A Expired - Fee Related CA1296904C (en) | 1988-07-25 | 1988-10-11 | Injector valve |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1296904C (en) |
-
1988
- 1988-10-11 CA CA000579778A patent/CA1296904C/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |