Cam-Actuated Pressure Valve for Staged Flow Without Wear
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Solution Overview
Problem
Existing valves for pressurized fluids are complex in construction and actuation, prone to wear and contamination, and do not effectively manage pressure and flow rates.
Innovation Solution
A valve design featuring a cam follower that moves along an axis between open, partially open, and closed positions, with a valve head and rod configuration that ensures fluid-tightness proportional to pressure and minimizes wear and contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If two concentric closure valves are actuated sequentially by a lever to achieve progressive opening, then the flow rate can be controlled, but the construction complexity increases due to the number of single pieces and assembly requirements
Solution Approach 1:
The patent merges two separate closure valves into a single integrated valve body with a unified sealing surface. The cam follower acts on one sealing surface to simultaneously control both the first and second closure valves, eliminating the need for two separate actuation mechanisms and reducing construction complexity while maintaining progressive opening capability.
Solution Approach 2:
The single valve body with unified sealing surface serves multiple functions: it acts as both the first and second closure valve, provides both levels of flow restriction, and is actuated by a single cam follower mechanism. This multi-functional design reduces the number of components while achieving the same flow control objectives.
2Ease of operation
If compression springs are used to promote valve closure, then the valve can return to closed position, but particulates are generated due to rotation and contact tribology
Solution Approach 1:
The patent removes the compression spring from the valve actuation mechanism entirely. Instead of using elastic recovery, the design employs a cam follower that is directly actuated by a lever, eliminating the source of particulate generation while maintaining the ability to return the valve to the closed position through controlled cam rotation.
Solution Approach 2:
The patent replaces the elastic mechanical system (compression spring) with a direct mechanical linkage system (cam follower and lever). This substitution eliminates the rotational friction and wear associated with spring compression and relaxation, thereby preventing particulate contamination of the pressurized fluid.
3Ease of operation
If two levers are used to actuate valves in multiple steps, then flow rate can be controlled in stages, but the actuation complexity increases
Solution Approach 1:
The patent combines the functionality of two separate levers into a single lever that actuates a cam follower. The cam profile itself provides the staged motion, allowing the valve to progress through different opening positions (first partially open, then fully open) in a single continuous lever movement, thereby reducing actuation complexity while maintaining staged flow control.
4Ease of operation
If relative sliding between valve head and valve seat surfaces is used for actuation, then the valve can open and close, but wear and particulate formation occur
Solution Approach 1:
The patent introduces a cam follower as an intermediary element between the lever and the valve head. The cam follower translates rotational lever motion into linear valve head motion without requiring sliding contact between the valve head and valve seat during actuation. The sealing surfaces only contact when the valve is in the closed position, minimizing wear and particulate formation while maintaining reliable actuation.
Data Source
AI summary
A valve comprising a valve body having an outflow pipe and comprising a valve seat which defines a first zone of the outflow pipe upstream of the valve seat and a second zone downstream of the valve seat, and a cam follower which is capable of moving with respect to the valve seat along an axis X between an open position, at least one partially open position and a closed position, and comprising a valve head which is capable of moving into abutment in a fluid-tight manner against an abutment surface of the valve seat, a rod which is fixedly joined to the valve head, in such a manner that there is defined a through-opening between a lateral surface of the rod and a corresponding internal surface of the valve seat which faces the lateral surface of the rod, characterized in that the through-opening is equal to a first value A when the cam follower is in the at least one partially open position and is equal to a second value B when the cam follower is in an open position, with B>A.