Control Valve Pressure Balance Spindle Vents
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Solution Overview
Problem
Conventional control valves for mixed water faucets fail to precisely control water temperature and output, suffer from sealing ring wear due to high water pressure, and exhibit instantaneous pressure balance leading to excessive regulation.
Innovation Solution
A control valve design that secures the fixed plate to the sleeve with a positioning block and sandwiches the sealing ring between the sleeve and fixed plate, uses a tubular spindle with pressure relief vents to regulate water pressure, and adjusts the flow rate through slots to balance water pressure, ensuring even water output and preventing part detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a pressure balance valve is used to stop hot water input when cold water pressure drops, then water pressure balance is achieved quickly, but the sealing rings cannot withstand the water pressure and are easily worn out causing water leaks
Solution Approach 1:
The pressure balance function is segmented into two stages: a fast-acting initial balance phase and a gradual fine-tuning phase. The valve body includes a first water inlet groove for cold water and a second water inlet groove for hot water, with the spindle controlling flow to each separately. This segmentation allows the system to achieve quick initial balance while distributing pressure loads to protect sealing rings from excessive wear.
Solution Approach 2:
The control valve employs dynamic pressure balance through the movable spindle that can adjust the opening of first and second adjusting slots. The spindle rotates to dynamically regulate the water flow rate of cold and hot water inlets, enabling the system to adapt to varying pressure conditions. This dynamic adjustment prevents instantaneous excessive pressure regulation that would otherwise damage sealing rings.
2Ease of manufacture
If the fixed plate is not secured to the sleeve, then assembly is simpler, but the fixed plate detaches from the sleeve causing malfunction
Solution Approach 1:
The attachment mechanism is segmented into modular components: a positioning block formed on the sleeve and a positioning hole formed on the fixed plate. This segmented design allows the fixed plate to be securely positioned and attached to the sleeve through the engagement of these features, preventing detachment while maintaining a relatively simple assembly process. The sealing ring is also segmented into a separate component that fits into a groove on the fixed plate.
3Ease of manufacture
If the sealing ring is not sandwiched between the sleeve and fixed plate, then assembly is easier, but the sealing ring detaches causing water leaks
Solution Approach 1:
The sealing ring is pre-positioned in a groove formed on the fixed plate before final assembly. This beforehand cushioning ensures the sealing ring is retained between the sleeve and fixed plate during operation, preventing detachment and water leaks. The groove structure provides a cushioning effect that absorbs any misalignment or movement, maintaining sealing effectiveness without requiring complex retention mechanisms.
4Device complexity
If the spindle has no pressure relief vents, then the structure is simpler, but the instantaneous water pressure deflects the spindle sideward causing imprecise control
Solution Approach 1:
Pressure relief vents are introduced as intermediary features on the spindle to manage instantaneous water pressure. These vents allow pressure equalization across the spindle, preventing sideward deflection caused by pressure imbalances. The vents serve as mediators that transmit pressure information and enable the spindle to maintain precise positioning without requiring a completely redesigned complex structure.
5Quantity of substance
If the water inlet chambers occupy large area of the fixed plate, then more water can be supplied, but the water output cannot be controlled evenly
Solution Approach 1:
The water inlet chambers on the fixed plate and the water outlet chamber on the movable plate are designed with specific area proportions (one-third of each plate's area). This local quality designation ensures that water flow is distributed evenly across the ceramic unit while maintaining adequate supply quantity. The proportional area allocation creates balanced flow characteristics that enable precise control of water output uniformity.
Data Source
AI summary
A control valve for a mixed water faucet includes a housing, two sealing gaskets, a control shaft, a ceramic unit, a sealing ring, a sleeve, a pressure balance unit, an adjusting cock, and a fastening member. The pressure balance unit includes a bushing and a spindle. The ceramic unit includes a fixed plate, a movable plate, and a protective jacket. Thus, the movable plate is rotatable relative to the fixed plate to change the connection area between the water outlet chamber of the movable plate and the water inlet chambers of the fixed plate so as to regulate the water flow rate and the mixed proportion of the cold water and the hot water.