초록 ▼

The mixing valve includes a plurality of flow regulating assemblies (A) each of which independently regulates the flow of one of a plurality of fluids. Each flow regulating assembly includes a pressure displaceable structure (22) which is physically displaced by changes in pressure and a movable val

The mixing valve includes a plurality of flow regulating assemblies (A) each of which independently regulates the flow of one of a plurality of fluids. Each flow regulating assembly includes a pressure displaceable structure (22) which is physically displaced by changes in pressure and a movable valving member (50) which is movable relative to a stationary valve seat (42) for adjusting the cross section of a flow path therebetween. The movable valving member is operatively connected with the pressure displaceable structure such that the cross section of the flow path varies generally in inverse proportion to the sensed pressure. A proportioning assembly (B) proportions back pressure from adjacent a mixed fluid outlet (132) between the flow regulating assemblies such that each flow regulating assembly regulates its fluid flow in accordance with the proportion of the back pressure accorded it. A mixed fluid selecting valve assembly C selectively connects the proportioning valve assembly with one of a plurality of mixed fluid outlets which have larger and smaller diameter sections to cause relatively low and high back pressures, hence, relatively high or low flow rates.

대표청구항 ▼

A mixing valve for selectively mixing a first incompressible fluid and a second incompressible fluid, the mixing valve comprising: means defining a first fluid inlet which is adapted to be connected with a source of the first incompressible fluid under pressure; a first regulating assembly operative

A mixing valve for selectively mixing a first incompressible fluid and a second incompressible fluid, the mixing valve comprising: means defining a first fluid inlet which is adapted to be connected with a source of the first incompressible fluid under pressure; a first regulating assembly operatively connected with the first fluid inlet means for regulating the rate of flow of the first fluid therethrough so as to maintain a generally constant first preselected pressure adjacent a means for defining a first regulator outlet, whereby the pressure and flow rate of the first incompressible fluid through the first regulator outlet is substantially independent of the pressure of the first incompressible fluid at the first fluid inlet; means for defining a second fluid inlet which is adapted to be connected with a source of the second incompressible fluid under pressure; a second regulating assembly operatively connected with the second fluid inlet means for regulating the flow of the second fluid therethrough so as to maintain a generally constant second preselected pressure adjacent a means for defining a second regulator outlet, whereby the pressure and flow rate of the second incompressible fluid through the second regulator outlet is substantially independent of the pressure of the second incompressible fluid at the second fluid inlet; fluid pressure proportioning means disposed between the first and second regulator outlets and a proportioning means outlet for selectively proportioning a back pressure at the proportioning means outlet between the first and second regulator outlets without controlling fluid flow therethrough, the proportioning means causing the first and second regulating assemblies to control the relative flow rates of the first and second incompressible fluids such that the first preselected pressure is maintained in the first regulator outlet and the second preselected pressure is maintained in the second regulator outlet, whereby the total flow rate of the first and second incompressible fluids mixed together and the back pressure in the proportioning means outlet remains substantially constant as the proportioning means varies the proportion of the first and second incompressible fluids; proportioning control means for selectively controlling the fluid pressure proportioning means to vary the proportioning of the back pressure between the first and second regulating assemblies, whereby the proportioning control means indirectly causes the first and second regulating assemblies to control the relative flow rates of the first and second incompressible fluids; mixed fluid flow rate selecting means for selectively restricting a flow path downstream from the proportioning means outlet, such that restricting the flow path tends to increase the back pressure in the proportioning means outlet causing the first and second regulating assemblies to decrease the fluid flow therethrough to hold the first and second preselected pressures and the back pressure substantially constant and such that enlarging the flow path tends to decrease the back pressure in the proportioning means outlet causing the first and second regulating assemblies to increase the fluid flow therethrough to hold the first and second preselected pressures and the back pressure substantially constant, whereby the mixed flow rate selecting means varies the total flow rate without varying the relative flow rates of the first and second incompressible fluids; whereby the proportioning means and the mixed fluid flow rate selecting means act on the mixed first and second incompressible fluid downstream from the first and second regulating assemblies to cause the first and second regulating assemblies to control the relative and total flow rates of the first and second incompressible fluids.