Steam Engine Control Valve Annular Sealing Design
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Solution Overview
Problem
Conventional control valves for steam engines experience high leakage and wear due to high temperatures and pressures, leading to incomplete closure and system malfunctions, especially during cold starts and operation.
Innovation Solution
A control valve design featuring an annular contact surface between a conical valve body and a flat valve seat, with a tapered surface forming a thin, easily manufacturable and repairable contact area, utilizing an elastic element for axial movement and steam pressure for closing force, and a decoupled valve train for precise control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional valve design is used in high temperature and pressure steam engines, then the valve can control steam flow, but the valve element experiences excessive force and wear leading to leakage
Solution Approach 1:
The invention applies local quality by creating a conical contact surface specifically at the valve body and seat interface, while the rest of the valve components maintain conventional designs. This localized conical surface concentrates the closing force and distributes wear, improving sealing reliability without requiring the entire valve structure to be redesigned for high wear resistance.
Solution Approach 2:
The invention uses a conical (curved) contact surface instead of a flat valve body and seat interface. This curved geometry allows for gradual force distribution and self-aligning characteristics that reduce peak stresses and wear at the sealing interface, thereby improving reliability under high temperature and pressure conditions.
2Duration of action of stationary object
If the valve body and seat are made harder to reduce wear, then durability improves, but manufacturing complexity and cost increase
Solution Approach 1:
Instead of hardening the entire valve body and seat, the invention applies local quality by making only the contact surfaces conical in geometry. This localized geometric modification is simpler and less costly to manufacture than applying hard coatings or heat treatments to the entire component, while still achieving the desired wear resistance at the critical sealing interface.
Solution Approach 2:
The conical contact surface geometry provides inherent self-aligning and load-distributing properties that reduce wear during operation. This geometric design achieves durability through form rather than material modification, avoiding the need for complex hardening processes or expensive wear-resistant alloys, thus maintaining ease of manufacture.
3Productivity
If steam is injected at high pressure quickly, then engine efficiency improves, but the piston ring seal experiences high demands leading to leakage
Solution Approach 1:
The invention segments the steam flow control into two functional zones: the conical contact surface that manages the high-pressure steam flow and the piston ring seal that manages the lubricating oil. By isolating these functions spatially and functionally, the valve design allows high-pressure steam injection without compromising the seal's ability to prevent oil leakage, thus maintaining both productivity and reliability.
Solution Approach 2:
The conical contact surface acts as an intermediary between the high-pressure steam flow and the piston ring seal. It provides a controlled interface that manages the steam flow dynamics, reducing the direct impact on the seal and allowing the seal to focus on its primary function of preventing oil leakage while the steam injection maintains high power output.
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 reliable and permanent sealing of steam flow, reducing wear and leakage, while allowing for easy maintenance and production, with the valve body and seat materials providing sufficient hardness and durability to withstand high thermal stresses.
Implementation Method 1
a valve body (52) which is guided translationally along a central axis CA of the control valve and is preferably subjected to force against the valve seat by means of an elastic element
Implementation Method 2
an axial end of the valve body (52) facing the valve seat (51) has a surface chamfered towards the central axis of the valve body, thereby forming an annular contact surface with the valve seat
Implementation Method 3
utilizing an elastic element for axial movement and steam pressure for closing force
Data Source
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AI summary
The present invention relates to a control valve 50 for controlling and/or regulating a fluid flow, in particular a steam flow, in a steam engine 1, comprising: a valve seat 51, a valve body 52 which is guided translationally along a central axis CA of the control valve 50 and is preferably subjected to force against the valve seat 51 by means of an elastic element 54, wherein an axial end of the valve body 52 facing the valve seat 51 has a surface 52A chamfered towards the central axis of the valve body 52, thereby forming an annular contact surface with the valve seat 51, or an axial end of the valve seat 51 facing the valve body 52 has a surface 51A chamfered towards the central axis of the valve seat 51, thereby forming an annular contact surface with the valve body 52.Furthermore, the present invention relates to a steam engine 1 comprising the control valve 50 and to a combined heat and power plant comprising the steam engine.