Core Technical Advantages
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Bi-Directional Flow Flexibility: The 122A is engineered to handle both diverging (one inlet, two outlets) and converging (two inlets, one outlet) service. This makes it a highly flexible component for pneumatic piping, capable of switching between two different pressure sources or diverting a single source to different downstream headers.
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Multi-Media Compatibility: While primarily used for gaseous service, its high-capacity design allows it to handle liquid service as well, particularly gas-loaded liquids.
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High-Capacity Throughput: Despite its compact footprint, the 122A is designed for high flow rates, ensuring that downstream actuators or relays receive a full-volume pressure signal without the lag caused by restrictive internal porting.
Ease of Operation and Maintenance
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Convenient Installation: The valve features a simple, inline design with 1/4-inch NPT connections, allowing it to be mounted directly into the piping without the need for complex brackets or specialized mounting hardware.
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Visual Leak Detection: The spring case includes a 1/8-inch NPT vent. This acts as a diagnostic port—if the internal diaphragm fails, air will escape through this vent, providing an immediate visual or audible signal to maintenance personnel.
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Simplified Maintenance: The 122A is designed for top-entry maintenance. Most internal parts can be inspected or replaced by simply removing the spring case, meaning you do not have to remove the entire valve body from the process piping, significantly reducing downtime.
Technical Specifications
| Feature | Details |
| Action Type | Snap-acting (Non-throttling) |
| Flow Service | Gaseous (Diverge/Converge), Liquid (Converge), Gas-loaded Liquid (Diverge) |
| Maximum Inlet Pressure | 10.3 bar (150 psig) |
| Input Signal Range | Dependent on spring selection (e.g., 0.2 to 4.5 bar) |
| End Connections | 1/4 NPT |
| Construction | Aluminum body and spring case; Nitrile or Fluorocarbon internals |
Xi’an Yunrui Trading Co., Ltd. Technical Support
Xi’an Yunrui Trading Co., Ltd. is a major Fisher Valves supplier, providing a comprehensive range of original Emerson automation solutions. We leverage deep technical expertise to provide professional support and model selection guidance for procurement and engineering projects. By optimizing our supply chain, we provide a distinct pricing advantage, ensuring we offer highly competitive prices while assisting clients in optimizing processes and achieving digital upgrades.
If you are experiencing hunting in your pneumatic sequence and suspect the deadband of your switching valve is too narrow, please contact our technical team for a tuning consultation.
