Pressure-Actuated Irrigation Valve With Low-Loss Threshold Opening
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Solution Overview
Problem
Conventional irrigation systems face issues with inconsistent water distribution due to high-pressure requirements for valve activation and the use of complex structures that disrupt water flow, leading to uneven watering and potential valve malfunctions from impurities in rural water sources.
Innovation Solution
The development of pressure-actuated valves with a housing, piston, and U-cup seals that prevent water from flowing until a threshold pressure is reached, ensuring simultaneous activation of all sprinklers and minimizing pressure loss, using a biasing mechanism and air vents to maintain smooth operation and prevent sticking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional stop valves are used to prevent water from exiting until threshold pressure is reached, then water distribution consistency is improved, but the valves require extremely high pressure levels to open and cannot be used in large systems
Solution Approach 1:
The patent changes the pressure threshold parameter by using a spring mechanism with adjustable compression force. The spring is compressed by a piston that moves in response to water pressure, and the valve opens when the pressure overcomes the spring force. By adjusting the spring compression, the opening pressure can be set to appropriate levels for large irrigation systems rather than requiring extremely high pressures.
Solution Approach 2:
The patent replaces the conventional complex mechanical valve structure with a simpler spring-piston mechanism. The spring provides the closing force while the piston responds to water pressure, creating a more reliable and easier-to-manufacture valve that doesn't require extremely high pressure thresholds.
2Reliability
If conventional stop valves with complicated internal structures are used, then valve closure function is achieved, but water flow is disrupted resulting in uneven and inconsistent delivery to sprinkler heads
Solution Approach 1:
The patent segments the valve into simple functional components: a piston that responds to pressure, a spring that provides closing force, and a seat that provides sealing. This segmentation eliminates complicated internal structures while maintaining reliable valve closure function.
Solution Approach 2:
Instead of using complex internal passages and mechanisms to achieve valve closure, the patent inverts the approach by using a simple piston-spring assembly that pushes against a seal. The valve opens by default when pressure overcomes the spring force, and closes when pressure drops, eliminating the need for complicated internal structures.
3Reliability
If conventional valves with O-ring seals are used, then sealing function is provided, but the seals stick or get jammed preventing valve opening and are exposed to impurities causing damage
Solution Approach 1:
The patent extracts the sealing function from the valve's internal mechanism by using a piston with a seal that contacts a seat. The seal is protected from impurities because it only contacts the smooth seat surface, not the external environment. The sealing action is separated from the moving parts that could stick or jam.
Solution Approach 2:
The patent introduces a protected sealing interface where the piston seal contacts a stationary seat. This intermediary sealing arrangement protects the seal from impurities in the water and prevents sticking by maintaining a controlled, clean contact surface between the seal and seat.
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
Ensures consistent water distribution to all areas by activating all sprinklers simultaneously at a predetermined pressure, reducing pressure loss and minimizing the risk of valve malfunction from impurities, thus maintaining even watering and extending the lifespan of irrigation systems.
Implementation Method 1
a biasing mechanism in the chamber for biasing the piston against the stop until the water pressure in the water passage is at least equal to a threshold pressure
Implementation Method 2
Cup seals are preferred over O-rings to seal the movable piston within the chamber because cup seals involve less friction with the sides of the chamber, thereby allowing the piston to travel more smoothly
Data Source
AI summary
The present invention provides unique pressure actuated valves and related methods that may be used in applications where a plurality of fluid emission devices are provided on a plurality of lines containing fluid under pressure, in order to prevent fluid from escaping from the fluid emission devices until a consistent threshold or predetermined level of fluid pressure is obtained in the lines, without causing significant water pressure and/or flow loss through the valves. Valves of the present invention include a housing having an upper body and a lower body that may be coupled together to form an inner chamber, the lower body having an inlet in communication with a source of fluid under pressure, the upper body having an outlet in communication with a fluid emission device. A hollow movable fluid transmission piston is provided in the chamber for communicating between the inlet and outlet. The chamber formed between the upper and lower bodies may be provided with cup seals at opposite ends of the chamber to reduce friction and prevent fluid from entering therein, and a side air vent. A wider lower end of the piston is urged toward the lower housing body using a biasing mechanism, which pushes an O-ring at the lower end against a stop to prevent fluid from entering into the hollow center of the piston. When fluid with a sufficient pressure is provided from the source, it pushes the O-ring away from the stop and against the urging of the biasing member, allowing fluid to flow around the stop, through the center of the piston, and out through the upper body into the fluid emission device. The vent in the chamber allows air inside the chamber (surrounding the biasing mechanism) to escape so that there is no added air pressure within the chamber to be overcome by the fluid pressure.