Key Benefits and Advantages
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Quick-Change Trim Package: One of the most significant advantages of the Type 1290 is its modular trim design. The entire internal trim assembly can be removed and replaced quickly, significantly reducing maintenance downtime and labor costs.
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Easy In-Line Maintenance: The regulator is designed so that all internal parts can be inspected or replaced without removing the valve body from the piping. This “top-entry” accessibility is critical for systems that cannot afford long periods of inactivity.
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In-Service Travel Inspection: Includes a visual travel indicator that allows operators to see the position of the valve plug while the unit is in operation. This feature facilitates easy troubleshooting and performance monitoring without interrupting the process.
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High Accuracy: As a pilot-operated system, the 1290 offers a high degree of sensitivity and a narrow proportional band. It can maintain tank pressures within a few inches of water column, which is essential for protecting low-pressure storage vessels.
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Proven Technology: Built upon decades of Fisher regulator engineering, the 1290 utilizes field-proven components to ensure reliability in harsh chemical and terminal environments.
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Self-Contained Operation: The system is powered by the process gas itself, eliminating the need for external air or electric power sources, which simplifies installation in remote tank farm locations.
Technical Properties
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Operation: Pilot-operated backpressure/relief control.
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Application: Vapor recovery (out-breathing) and low-pressure gas management.
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Body Sizes: Available in standard sizes suited for high-volume vapor headers, typically NPS 1 through NPS 6.
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Pressure Capabilities: Engineered to sense very low pressures (inches of water column) while handling higher pressure drops across the valve.
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Materials: Available in a variety of alloys, including stainless steel, to handle corrosive vapors and atmospheric conditions.
Field of Application
The Type 1290 is a cornerstone of environmental protection and safety in bulk storage facilities. It is used wherever vapor emissions must be captured rather than vented.
Primary Industries and Uses:
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Tank Terminals: Managing the “out-breathing” of large storage tanks during liquid pump-in operations.
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Chemical Processing: Capturing volatile organic compound (VOC) vapors from process vessels.
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Oil and Gas: Integrated into vapor recovery units (VRU) to manage gas flow from stock tanks.
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Refineries: Backpressure control for low-pressure gas collection systems and flare headers.
