Automated Valve Stem Lubrication via Actuator Feedback
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Solution Overview
Problem
Valve stem malfunctions due to freezing from corrosion and contamination, particularly in large municipal systems like the New York City wastewater system, where periodic lubrication of valve stems and actuators is difficult to maintain due to numerous gates and hard-to-reach locations.
Innovation Solution
An at least partially automated valve stem lubrication system that includes a lubricant source and control system, where a pump connected to a power source automatically supplies grease to valve stem surfaces upon receiving specific input signals, such as actuator movement or position information, ensuring consistent lubrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If periodic manual lubrication is implemented, then valve stem freezing is prevented, but maintenance difficulty increases due to numerous gates and hard-to-reach locations
Solution Approach 1:
The valve stem lubrication system performs lubrication automatically using its own actuator motor to drive the pump, eliminating the need for external manual intervention. The system serves itself by utilizing existing operational movements to trigger and power the lubrication process.
Solution Approach 2:
The patent replaces manual mechanical lubrication with an automated electromechanical system. The motor-driven pump delivers lubricant automatically based on control signals, substituting human-operated mechanical grease guns with an electrically controlled delivery system.
2Productivity
If automated lubrication system is implemented, then maintenance efficiency improves, but device complexity increases
Solution Approach 1:
The valve actuator motor serves multiple functions: it operates the valve stem and simultaneously powers the lubrication pump. This multi-functionality eliminates the need for a separate power source, reducing overall system complexity while maintaining automated lubrication capabilities.
Solution Approach 2:
The patent combines the lubrication system with the existing valve actuator assembly. The pump, lubricant reservoir, and control components are integrated into the actuator housing, merging two separate systems into one unified structure.
3Loss of substance
If lubrication is applied only during manual maintenance, then lubricant consumption is controlled, but valve stem protection consistency deteriorates
Solution Approach 1:
The system applies lubrication periodically based on valve actuation cycles rather than continuous operation. The pump delivers lubricant at specific intervals triggered by actuator movement, ensuring protection is applied regularly without excessive lubricant consumption.
Solution Approach 2:
The control system monitors valve actuator operation and uses this feedback to trigger lubrication delivery. When the actuator moves the valve stem, the control system detects this motion and automatically activates the pump to deliver lubricant to the contact surfaces.
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 system effectively prevents valve stem freezing by ensuring consistent lubrication, even in hard-to-reach locations, reducing maintenance challenges and extending the lifespan of valve actuators and stems.
Implementation Method 1
a pump, connected to a source of power, is in fluid communication with the lubricant... the pump pumps lubricant onto a valve stem surface area
Data Source
AI summary
An at least partially automatic valve stem lubrication system including a source of grease lubricant, a pump and an at least partially automated control system, the control system structured and arranged such that lubricant is pumped onto a valve stem surface area as a function of the receipt of certain inputs.