Condensate Drain Valve with Float Backup for Boiler Overpressure
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Solution Overview
Problem
Existing draining valves for condensate in condensation boilers are inadequate as they fail to prevent smoke passage when there is no condensate and can be overwhelmed by excessive condensate flow, leading to potential overpressure issues that prevent proper drainage.
Innovation Solution
A draining valve with a floating shutter and a secondary draining channel that opens when a predetermined force is exceeded, ensuring condensate drainage even under high pressure conditions, while preventing smoke passage through the use of a toroidal float and check valve mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a float-type draining valve is used to prevent smoke passage, then smoke prevention is improved, but the valve fails under exceptional overpressure forces from abundant condensate feeding
Solution Approach 1:
The draining valve is segmented into two independent channels: a first draining channel controlled by a float for normal operation, and a second draining channel controlled by a check valve for overpressure conditions. This segmentation allows each channel to handle specific scenarios, ensuring reliable smoke prevention while maintaining drainage capability under exceptional conditions.
Solution Approach 2:
The check valve acts as an intermediary mechanism that activates only when the float mechanism fails under overpressure. It provides a backup drainage path that opens under exceptional forces, preventing condensate backup while maintaining the primary float-controlled channel for normal smoke prevention operation.
2Object-affected harmful factors
If a siphon is used to prevent smoke evacuation through the discharge duct, then smoke prevention is improved, but the siphon becomes ineffective when condensate is absent
Solution Approach 1:
The float-type draining valve is a self-activating mechanism that automatically opens or closes based on the presence of condensate. When condensate is present, the float rises to open the draining channel; when absent, it closes to prevent smoke passage. This self-service capability ensures adaptability across different operating conditions without requiring external control.
Solution Approach 2:
The valve operation is based on parameter changes in the condensate level. The float responds to changes in condensate presence by changing its position, which in turn changes the state of the draining channel from closed (smoke prevention) to open (condensate drainage), providing adaptability to different operational states.
3Object-affected harmful factors
If the draining channel is closed in the absence of condensate to prevent smoke passage, then smoke prevention is improved, but condensate drainage is blocked when overpressure forces prevent float rise
Solution Approach 1:
The drainage system is segmented into two channels: the first channel remains closed during normal operation to prevent smoke passage, while the second channel serves as a backup that opens under overpressure conditions. This segmentation ensures that smoke prevention is maintained during normal operation while drainage productivity is restored when exceptional conditions occur.
Solution Approach 2:
The check valve is pre-positioned and spring-loaded to provide beforehand cushioning against overpressure failures. When exceptional forces prevent the float from rising, the check valve's pre-configured mechanism activates to open the second draining channel, cushioning against the potential failure of the primary drainage path and maintaining condensate drainage productivity.
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 solution effectively prevents smoke passage and ensures condensate drainage in all operating conditions, including high condensate flow scenarios, maintaining boiler functionality and safety.
Implementation Method 1
a float is provided therebetween. This float is configured so that, in the absence of condensate, the draining channel is closed, thus avoiding the presence of an open channel that can be travelled by smoke, and that in the presence of condensate, it rises, thereby opening a draining channel
Implementation Method 2
the floating shutter is further configured to selectively provide a secondary draining channel when, in the second lowered position, a force higher than a predetermined value acts on the first, or upper face
Data Source
Figure 1~2
Figure 3~4
AI summary
A draining valve for draining the condensate of a condensation boiler, the valve extending along an axis A and comprising a body valve; a condensate feeding inlet and a condensate draining outlet on opposite sides of the body valve along the axis A; a floating shutter housed inside the body valve and selectively movable relative to the body valve along the axis A between a first raised position in which it opens a main draining channel and a second lowered position in which it is in abutment against the draining outlet and closes the main draining channel; wherein the floating shutter is also configured for selectively opening a secondary draining channel when in the second lowered position a force higher than a predetermined value acts on the first face.