Differential Pressure Valve With Diaphragm Status Indication
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Solution Overview
Problem
Differential pressure control valves in hydronic installations lack visibility into the diaphragm's position and do not facilitate easy un-blocking when the diaphragm becomes stuck, hindering efficient operation.
Innovation Solution
Incorporation of a hand wheel, presetting screw, indicator element, and diaphragm un-blocker element that allow for visual indication of diaphragm status and easy un-blocking by rotating and axially moving components, ensuring the diaphragm's position is visible externally and can be un-blocked without manual intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a traditional differential pressure control valve is used, then the valve provides differential pressure control function, but the diaphragm position is not visible from the exterior and un-blocking is difficult
Solution Approach 1:
An indicator element is introduced as an intermediary component that visually transmits the diaphragm's position status from the interior to the exterior of the valve. The indicator element is coupled to the diaphragm assembly and provides external visibility of the diaphragm's blocked or unblocked state without requiring direct observation of internal components.
Solution Approach 2:
The indicator element is designed to automatically reflect the diaphragm's position status without requiring external monitoring devices or complex sensing systems. The indicator's position directly corresponds to the diaphragm's state, providing self-indicating functionality that eliminates the need for additional information transmission mechanisms.
2Ease of operation
If the diaphragm becomes blocked in traditional valves, then operational disruption occurs, but manual intervention is required for un-blocking
Solution Approach 1:
The valve stem is designed to perform self-service un-blocking of the diaphragm through its own axial movement during normal valve operation. When the valve stem moves axially, it automatically pushes the diaphragm to unblock it, eliminating the need for external manual intervention and reducing maintenance time.
Solution Approach 2:
The un-blocking function is merged with the existing valve stem movement mechanism. The same axial movement that operates the valve also serves to unblock the diaphragm, combining two functions into one motion and eliminating the need for separate un-blocking operations.
3Loss of information
If the indicator element is made axially moveable to indicate diaphragm status, then visual indication is provided, but the mechanism complexity increases
Solution Approach 1:
The indicator element is designed to move axially automatically in response to the diaphragm's position without requiring external actuation or complex mechanical linkages. The indicator's axial movement is directly coupled to the diaphragm's blocked or unblocked state, providing self-indicating functionality that minimizes additional mechanism complexity.
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
Enables clear visualization of diaphragm status and easy un-blocking, ensuring consistent differential pressure control and preventing operational disruptions due to stuck diaphragms.
Implementation Method 1
a spring acting with a first end against the diaphragm housing and with a second end against a spring nut attached to the valve stem
Implementation Method 2
The diaphragm is attached to the valve stem and acts on the valve stem depending on the differential pressure across the diaphragm
Implementation Method 3
The diaphragm of such differential pressure control valves is made from elastic material so that the diaphragm can stick to the diaphragm housing thereby causing a blocking of the diaphragm
Data Source
Figure 1
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AI summary
Differential pressure control valve (10) comprising: a valve housing (11) providing an inlet (12), an outlet (13) and a valve seat (16); a valve plunger (17) mounted to a valve stem (21) and acting together with the valve seat (16); a diaphragm housing (22) and diaphragm (23), whereby the diaphragm (23) is attached to the valve stem (21) and defines pressure chambers inside the diaphragm housing (22); a presetting unit comprising a spring (28) acting with a first end against the diaphragm housing (22) and with a second end against a spring nut (27), whereby the spring nut (27) is moveable relative to the valve stem (21) in order to define the spring force acting on the diaphragm (23) through the valve stem and thereby a presetting value for valve; whereby said presetting unit further comprises a hand wheel (34), a presetting screw (35) and an indicator element (36), whereby by rotating the hand wheel (34) the presetting screw (35), the indicator element (36) and the valve stem (21) are rotatable causing a relative movement between the valve stem and the spring nut thereby adjusting the presetting value; and whereby said indicator element (36) is also axially moveable relative to the valve stem (21) in a way that when the diaphragm (23) is unblocked the indicator element (36) is moveable relative to the valve stem (21) until the indicator element reaches the valve stem, and that when the diaphragm (23) is blocked the indicator element (36) is blocked by the valve stem (21). (Figure 1)