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US 2010/0058534 A1Published application
Pressure balancing spool mixing valve
AssigneeWolverine Brass, Inc.
InventorsRobert Martin, Danny Li
Life of this patent
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Abstract
There is herein described a single handle pressure balancing spool valve for mixing user-adjustable hot and cold water flow to a fixture such as a shower or tub and to adjust the rate of mixed water flow. A rotatable disc with hot and cold intake openings and an outlet opening are provided which control the degree of covering on the inlet ports of the valve. Pressure balancing of inlet pressure is provided within the valve by means of a piston-cylinder assembly to compensate for fluctuations in water inlet pressure to avoid scalding of the user.
Claims8
A single control pressure balancing spool mixing valve comprising:
- an upper single control cartridge and a lower pressure control housing, said cartridge and housing being joined together axially;
- said control cartridge including an operating spindle extending axially therein and being rotatable about its longitudinal axis;
- a pivot pin extending through said spindle intermediate the ends of the spindle, whereby said spindle can pivot about said pin;
- said pressure control housing having a hot water inlet, a cold water inlet, and a mixed water outlet;
- moveable disc means adopted to proportion the amount of hot and cold water flowing through the valve to said mixed water outlet, said means being operatively connected to one end of said spindle for rotation therewith;
- said moveable disc having a recess on one surface thereof to receive said one end of said spindle, whereby movement of said spindle about said pin will cause lateral movement of said moveable disc;
- means on said moveable disc to control the volume of mixed water flow as a result of the pivoting of the spindle and the moveable disc;
- pressure balance means within said housing and in communicate with both the hot and cold water inlets to sense and compensate for any fluctuation in the pressure of either the hot or cold water.
5 more elements
Dependencies are inferred from the claim text.