Balanced Valve Trim for Regulator Velocity Control
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Solution Overview
Problem
Regulator valves often become oversized for changed operating conditions, leading to potential damage from extreme velocities at the valve seat when operating near fully open or closed states, especially under higher pressure conditions, and existing solutions like smaller valve seats compromise performance.
Innovation Solution
A modified balanced valve trim with a reduced orifice size and internal pressure balancing mechanism, allowing the valve disk assembly to operate further away from the seat ring, reducing extreme velocities and maintaining control across a range of inlet pressures without altering the actuator or valve body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the regulator valve is sized for higher flow rates, then it can handle peak demand, but the valve operates near fully open state causing extreme velocities and potential damage to sealing surfaces
Solution Approach 1:
The valve trim is segmented into multiple components: a valve disk assembly with balanced bore, a cage with restricted orifice, and a seat ring. This segmentation creates separate functional zones that control fluid flow in stages, reducing velocity at the seat while maintaining overall flow capacity.
Solution Approach 2:
The cage with restricted orifice acts as an intermediary element between the valve disk and seat ring. It controls and regulates the fluid flow, reducing the velocity of fluid reaching the seat area and preventing direct high-velocity impact on sealing surfaces.
2Stress or pressure
If the regulator valve is sized for higher pressure conditions, then it can maintain pressure regulation, but the valve operates near fully closed state causing extreme velocities and potential damage to sealing surfaces
Solution Approach 1:
The balanced bore in the valve disk assembly creates counterbalancing pressure forces. Fluid pressure acts on both sides of the valve disk, creating a balanced force system that reduces the net force on the sealing surfaces and prevents extreme velocity conditions during pressure regulation.
Solution Approach 2:
The valve trim design dynamically balances pressures across the valve disk assembly. The restricted orifice in the cage and balanced bore work together to create dynamic pressure equalization, preventing static high-pressure conditions that would cause extreme velocities at the seat.
3Object-affected harmful factors
If a smaller valve seat is used to reduce velocity, then damage to sealing surfaces is reduced, but valve performance and flow capacity are compromised
Solution Approach 1:
The solution moves the velocity reduction mechanism from the seat area to the cage orifice and balanced bore. Instead of reducing seat size, the design creates a three-dimensional flow control system that reduces velocity through restricted orifices and balanced pressure zones while maintaining full seat diameter for optimal sealing and flow capacity.
4Adaptability or versatility
If the valve operates near fully open or closed states, then it can handle varying flow demands, but extreme velocities occur causing damage to sealing surfaces
Solution Approach 1:
The restricted orifice in the cage and balanced bore create preliminary flow control before fluid reaches the seat. This preliminary action reduces fluid velocity and balances pressure before the valve disk approaches the seat, preventing extreme velocity conditions even when the valve operates near fully open or closed states.
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 enables the regulator valve to maintain effective operation under lower volume flow conditions without damaging the sealing surfaces, reducing wear and maintaining performance across varying flow rates without the need for resizing the valve or actuator.
Implementation Method 1
a first effective pressure area is formed at the first end of the interior space, and a second effective pressure area is defined at the second end of the interior space. The second effective pressure area opposes the first effective pressure area.
Data Source
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AI summary
A balanced valve trim, a regulator valve with a balanced valve trim, and methods for modifying a regulator valve with a balanced valve trim assembly to accommodate different volume flow rates through the regulator valve are disclosed.