Vertical Slide Backwash Valve Sealing and Flow
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Solution Overview
Problem
Existing vertical slide backwash valves for swimming pools and spas experience hydraulic inefficiencies and seal wear due to S-shaped flow paths and radial seals, leading to increased pressure drop and potential leaks during filter and backwash modes.
Innovation Solution
A reconfigurable vertical slide backwash valve design featuring a sliding gate with a shelf gate gasket and sinusoidal flanges, allowing for straight-through flow in filter mode and curved flow in backwash mode, with enhanced sealing mechanisms to reduce friction and wear, and minimize the need for lubricants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If radial seals are used in vertical slide backwash valves, then sealing capability is improved, but friction and wear increase during actuation
Solution Approach 1:
The patent inverts the sealing approach by using a stationary seal at the discharge port instead of radial seals on moving pistons. The shelf gate gasket provides sealing against a stationary discharge port shoulder, eliminating the sliding friction that causes wear in conventional radial seal designs.
Solution Approach 2:
The patent extracts the sealing function from the moving spool assembly and places it at the stationary discharge port. This separation allows the seal to remain stationary during actuation, eliminating the friction and wear problems associated with moving seals.
2Device complexity
If S-shaped flow paths are used in vertical slide backwash valves, then valve structure is simplified, but hydraulic efficiency decreases and pressure drop increases
Solution Approach 1:
The patent segments the flow path into separate sections using a spool with distinct first and second sections. Each section handles a different flow path (filter mode or backwash mode), allowing straight-through flow geometry without requiring complex S-shaped routing while maintaining structural simplicity.
Solution Approach 2:
The patent uses a vertical spool configuration that moves up and down within the valve body, creating separate flow paths in the vertical dimension. This allows straight-through horizontal flow paths while using vertical spool movement to switch between modes, avoiding S-shaped routing.
3Force
If lubricant is applied to radial seals, then friction is reduced during actuation, but seal damage occurs due to dirt and debris attachment
Solution Approach 1:
The patent extracts the sealing function from the moving spool assembly and places it at the stationary discharge port. This separation allows the seal to remain stationary during actuation, eliminating the friction and wear problems associated with moving seals.
Solution Approach 2:
The stationary shelf gate gasket seals against a stationary discharge port shoulder, requiring no lubricant application. The design is self-sufficient, eliminating the need for external lubrication that could attract contaminants.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design provides hydraulic efficiency and reduced pressure drop in filter mode while minimizing seal wear and leaks, extending the lifespan of the valve and reducing maintenance needs.
Implementation Method 1
the shelf gate gasket compressingly engages the discharge port shoulder thus sealing the discharge port
Implementation Method 2
the sliding gate provides coaxial straight-through flow between the first filter port and the first pool port, and coaxial straight-through flow between the second pool port and the second filter port
Implementation Method 3
the sliding gate provides curved flow between the second pool port and the first filter port, and curved flow between the second filter port and the discharge port
Implementation Method 4
A reconfigurable vertical slide backwash valve design featuring a sliding gate with a shelf gate gasket and sinusoidal flanges, allowing for straight-through flow in filter mode and curved flow in backwash mode, with enhanced sealing mechanisms to reduce friction and wear
Data Source
AI summary
Provided is a backwash valve comprising a body including a central tube extending along a length of the body, a first pool port and first filter port axially aligned at a first position along the body length, a second pool port and second filter port axially aligned at a second position along the body length, and a waste port; and a sliding gate including a stem connected to a gate body, the gate body including first and second chambers separated by an internal wall; the sliding gate movable between a filter position wherein fluid communication is provided among the first filter port, first chamber, and first pool port, and a backwash position wherein fluid communication is provided among the first filter port, second fluid chamber, and second pool port, and between the second filter port and waste port.