MIXING VALVE
A mixing valve (10) includes a valve body (12) having a hot fluid inlet (14), a cold fluid inlet (16), a mixed fluid outlet (18), and a cavity (20) in the valve body (12) between the inlets (14, 16) and the outlet (18). Mixing valve (10) includes a liner (30, 130, 230, 430, 530, 630, 730, 830) positioned in valve body (12) and a valve member (40, 140, 240, 340, 440, 540, 640, 740, 840) movable therein between a first position restricting the flow of hot fluid and a second position. Liner (30, 130, 230, 430, 530, 630, 730, 830) includes a downstream valve seat (74, 174, 274, 474, 574, 674, 774) that, when engaged by valve member (40, 140, 240, 340, 440, 540, 640, 740, 840), restricts flow of hot fluid past valve member (40, 140, 240, 340, 440, 540, 640, 740, 840).
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This application is a nationalization of and claims the benefit of co-pending PCT Application Number PCT/US02/27056 having International Publication Number WO 03/019315 A1 filed 23 Aug. 2002, which claims the benefit of U.S. Application Ser. No. 60/314,803 filed 24 Aug. 2001.
FIELD OF THE INVENTIONThis disclosure relates to mixing valves. More particularly, this disclosure relates to valves for mixing a first fluid with a second fluid.
BACKGROUND AND SUMMARYMixing valves having valve bodies configured to combine flows of hot and cold fluids to provide a controlled mixed fluid temperature are known. Examples of such mixing valves using thermostatic control are shown in U.S. Pat. Nos. 6,315,210, 5,647,531, 5,379,936, 5,323,960, 5,203,496, and 5,011,074, the disclosures of which are hereby expressly incorporated by reference herein, the applicant/inventor in the present application being an inventor in each of these patents.
A mixing valve includes a valve body having a hot fluid inlet, a cold fluid inlet, and a mixed fluid outlet. The valve body includes a cavity between the inlets and the outlet. In one embodiment, a first seat and a second seat are in the cavity, and a valve member in the cavity is movable between a first position engaging the first seat and a second position engaging the second seat.
In one aspect of the disclosure, a liner in the cavity includes the first and second seats. In another aspect of the disclosure, the valve member includes a weep opening to permit restricted flow of at least the hot fluid. In another aspect of the disclosure, the valve member includes a plurality of spaced apart mixing fins.
In another aspect of the disclosure the mixing valve includes a liner in the cavity, the liner including a hot liner inlet and a cold liner inlet. In one implementation of this aspect, the second seat is between the cold liner inlet and the first seat. In another implementation of this aspect, the cold liner inlet is between the first seat and the second seat. In another implementation of this aspect, the valve member is a poppet-style valve member and the hot liner inlet is a bore in a floor of the liner.
Additional features will become apparent to those skilled in the art upon consideration of the following detailed description of illustrative embodiments exemplifying the best mode of carrying out the drop leaf support apparatus as presently perceived.
Referring now particularly to
As shown in
As shown in
In thermostatic mixing valves, such as that shown in
As shown in
Referring now to
Liner 130 includes an upstream region 166 having a first seat 168. Illustratively, a floor 172 of liner 130 provides first seat 168. However, other configurations are possible within the scope of this disclosure. Hot liner inlet 136 is shown in
Valve member 140 includes a generally cylindrical portion 182 having a downstream end 184 and an upstream end 176. Upstream end 176 engages first seat 168 to close hot liner inlet 136. As valve member 140 moves toward engagement with first seat 168, cylindrical portion 182 covers hot liner inlet 136, restricting flow of hot fluid into valve body. Valve member 140 further includes a disc 188 coupled to downstream end 184 of cylindrical portion 182 with a connection member 190. Disc 186 includes an engagement surface 192 facing downstream to engage seating surface 180 of second seat 174.
When the temperature of the mixed fluid increases, thermally responsive fluid 50 expands, moving valve member 140 in an upstream direction. As valve member 140 moves upstream, valve member 140 moves toward a first position shown in
To prevent lock-up of valve 10, a weep opening Or port 194 may be formed in disc 186 as shown in
It is within the scope of this disclosure to provide a weep opening such as weep port 194 in a wide variety of valve configurations.
Referring now to
Referring now to
Fins 331 of
Referring now to
Referring now to
Valve member 540 is a “poppet” style valve member. Valve member 540 includes disc 586, a centering portion 502 extending from an upstream end 576 of disc 586, and a connection member 590 extending from engagement surface 592 of disc 586. Connection member 590 extends beyond second seat 574 to engage an actuator (not shown). During thermostat failure, first spring 555 biases valve member 540 such that engagement surface 592 of valve member 540 engages seating surface 580 of second seat 574, and these two surfaces engage to restrict the flow of hot fluid. In normal operation, when the mixed fluid temperature increases, the thermostat assembly moves valve member 540 in upstream direction 25 toward a first position in which upstream end 576 of disc 586 engages first seat 568, closing hot liner inlet 536.
As shown in
As shown in
Referring now to
Upper piston 781 is generally cylindrical in shape and has an upstream end 783 and a downstream end 785. Upstream end 785 includes inlet ports 787 to permit flow of hot fluid from the hot liner inlet 736 through upper piston 781. A central opening 789 is formed in upstream end 783 and receives connection member 790 therein. A flange 791 is coupled to connection member 790 and provides an engagement surface 793 which contacts upstream end 783 so that upper piston 781 and valve member 740 move together. Sides 795 of the generally cylindrical upper piston 781 are formed to include cold inlet holes 797 so that when sides 795 otherwise cover cold liner inlet 738, flow of cold fluid enters through cold inlet holes 797.
Cold liner inlet 738 is illustratively somewhat oversized compared with other cold liner inlets previously disclosed herein. In axial length, cold liner inlet has a length L2 that approximates the axial length L1 of upper piston 781. As such, when valve member 740 is seated against first seat 768, cold fluid flows through cold inlet holes 797 and between downstream end 785 and the downstream end of liner 730. When valve member 740 is seated against second seat 774, cold fluid flows through cold inlet holes 797 and inlet ports 787 in upstream end 785 of upper piston 781. Thus, valve member 740 permits flow of cold fluid from cold liner inlet 738 regardless of the position Of upper piston 781.
Referring now to
In operation, as the thermostat moves valve member 840 to close hot liner inlet 836, frustoconical region 843 cooperates with beveled interior edge 833 to center second o-ring 849 with hot liner inlet bore 836 as second o-ring 849 approaches the bore. Second o-ring 849 seats against the axially inwardly-facing walls that define hot liner inlet 836 to restrict flow of hot fluid therethrough. Upon failure of the thermostat, a spring (not shown) biases valve member 840 in a downstream direction 27 to a position wherein disc-shaped structure 835 is in hot liner inlet bore 836, and first o-ring 839 seats against the axially inwardly-facing walls that define hot liner inlet 836 to restrict flow of hot fluid therethrough. Because first and second o-rings 839, 849 seat against the inwardly facing wall of the bore, assembly is simplified as valve member 840 can be simply “dropped in” liner 830.
It should be understood that some of the valve members—as drawn in
Although a mixing valve has been described in detail with reference to certain preferred embodiments, variations and modifications exist within the scope and spirit of the invention as described and defined in the following claims.
Claims
1-45. (canceled)
46. A mixing valve comprising
- a valve body providing a first fluid inlet, a second fluid inlet, a mixed fluid outlet, and a cavity defined by at least one internal wall, the cavity being in communication with the inlets and the outlet, and
- a valve member movable along a central axis in the cavity between a position restricting flow from at least one of the fluid inlets and a position permitting flow through both of the inlets, the valve member including a central region and a plurality of spaced apart mixing fins each extending from the central region and including a surface that is non-parallel to the axis to facilitate mixing of the first and second fluids.
47. The mixing valve of claim 46, wherein each fin includes a generally radially outwardly facing front, a left side and an opposite right side each extending between the front and the valve member, the surface extending between a bottom edge of each of the left and right sides, the bottom edge of one of the left and the right sides being axially upstream of the bottom edge of the other side.
48. The mixing valve of claim 46, wherein the surface of each mixing fin is perpendicular to the axis.
49. The mixing valve of claim 46, wherein the surface of each mixing fin faces radially inwardly and axially upstream.
50. A mixing valve comprising
- a valve body providing a first fluid inlet, a second fluid inlet, a mixed fluid outlet, and a cavity having a longitudinal axis, the cavity defined by at least one internal wall, and the cavity being in communication with the inlets and the outlet,
- a first valve seat extending from the at least one internal wall,
- a second valve seat extending from the at least one internal wall, and
- a piston in the cavity and movable along the axis, the piston including a piston bore extending longitudinally therethrough and having a first piston end, a second piston end, a middle region between the ends, an engagement surface at the first piston end bordering the piston bore and engaging the first seat to block flow of the first fluid through the piston bore, a failure shutoff surface at the second piston end movable to engage the second valve seat, the first fluid entering the piston bore between the first valve seat and the engagement surface, the piston formed to include a slot therein positioned axially closer to the engagement surface than to the failure shutoff surface to facilitate mixing of the first and second fluids.
51. The mixing valve of claim 50, further comprising a liner including the first and second valve seats.
52. The mixing valve of claim 50, wherein the piston includes a plurality of spaced apart surfaces non-parallel to the axis and arranged to at least partially face the direction of flow of fluid through the piston bore to encourage turbulent flow through the piston.
53. The mixing valve of claim 52, wherein the plurality of surfaces is perpendicular to the axis through the cavity.
54. The mixing valve of claim 52, wherein at least a portion of at least one of the plurality of surfaces is sloped, having a radially extending component and an axially extending component.
55. A piston for use in a fluid mixing valve, the piston comprising:
- a main body region and
- a plurality of spaced apart fins extending from the main body region, at least a portion of the fins configured to lie non-parallel to the direction of flow of at least one fluid through the valve.
56. The piston of claim 55, wherein each fin includes a surface generally perpendicular to the axis.
57. The valve member of claim 55, wherein the only connection between each of the plurality of fins is the main body region.
58. The valve member of claim 55, wherein an axis extends longitudinally through the piston, each of the plurality of fins includes a surface nonparallel to the axis, a front region, a left side and an opposite right side, each side extending between the front region and the main body region, the surface extending between a bottom edge of each of the left and right sides, the bottom edge of one of the left and the right sides being axially upstream of the bottom edge of the other side.
59. The valve member of claim 58, wherein each of the plurality of fins includes a radially outwardly facing front surface, and the only connection between each of the plurality of structures is the main body region.
Type: Application
Filed: May 19, 2020
Publication Date: Mar 11, 2021
Applicant: Magarl, LLC (Naples, FL)
Inventor: Kevin B. Kline (Whitefish Bay, WI)
Application Number: 16/878,203