Actuator Mounting Kit for Valve Stem Alignment
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Solution Overview
Problem
Retrofitting existing piping systems with automated control systems often results in misalignment issues between the actuator shaft and the valve stem, leading to residual stress, wear, and potential breakage or leakage due to angular offsets and displacement components, which increases maintenance costs and system reliability concerns.
Innovation Solution
A kit comprising a mounting bracket, alignment bushing, valve stem driver, and seals ensures precise alignment and secure mounting of the actuator to the valve stem, preventing off-axis movement and reducing stress on the valve stem by using a mounting bracket that aligns with the valve body and a bushing that aligns the valve stem, thereby ensuring accurate rotation and minimizing wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If an actuator is retrofitted to an existing valve using the valve's flange, then the valve can be automated, but misalignment between the actuator shaft and valve stem occurs due to the valve stem not being centered between the threaded holes
Solution Approach 1:
A mounting bracket is introduced as an intermediary component between the valve flange and the actuator. The bracket includes a first mounting surface that attaches to the valve flange and a second mounting surface that attaches to the actuator, with a mounting axis that can be offset from the valve stem axis to compensate for misalignment
Solution Approach 2:
The mounting bracket is made adjustable along the mounting axis, allowing the position of the second mounting surface to be varied to achieve proper alignment. This dynamic adjustment capability enables the system to accommodate different misalignment conditions
2Extent of automation
If the actuator shaft is misaligned with the valve stem, then the automated control system can be installed, but residual stress and bending moments are placed on the valve stem
Solution Approach 1:
The mounting bracket serves as a mediator that absorbs and compensates for misalignment, preventing the transmission of bending moments and residual stress to the valve stem. The bracket's adjustable design allows it to accommodate offset conditions without imposing stress on the valve stem
Solution Approach 2:
The mounting bracket is designed in advance to compensate for potential misalignment issues. By providing an adjustable mounting mechanism before installation, the system prevents stress problems rather than addressing them after they occur
3Ease of operation
If manual handles are used on valves, then the system remains manually operated, but alignment inaccuracies do not cause focused wear problems
Solution Approach 1:
The mounting bracket acts as an intermediary that enables automated operation while eliminating the focused wear problems associated with misalignment. The adjustable design ensures proper alignment between the actuator shaft and valve stem, preventing the concentrated stress that would otherwise occur with automated systems
Data Source
AI summary
An actuator mounting kit and method for mounting an automatic valve actuator to a manually operated valve. The mounting kit includes a mounting bracket and a stem driver. The mounting bracket is connectable to the valve and has a bottom portion with a stem aperture through which a valve stem is extendable and a tongue matingly engageable with a slot of the valve body. The mounting bracket has an upper portion with a driver aperture aligned with the stem aperture. The stem driver has a first end matingly engageable with the valve stem and a second end extendable through the driver aperture in a way that the actuator is matingly engageable with the second end of the stem driver when the actuator is connected to the upper portion of the mounting bracket.