Technical Configuration Guide
The 67C series uses a specific lettering system to denote integrated features like filters and relief valves. Selecting the right suffix is essential for site safety and performance.
| Model Suffix | Integrated Features | Typical Use Case |
| C / CS | Base Regulator | Standard pressure reduction for clean air lines. |
| CR / CSR | Soft Seat Internal Relief | Prevents downstream overpressure in sensitive loops. |
| CF / CFS | Integrated 40-Micron Filter | Protects instruments from moisture and particulates. |
| CFR / CFSR | Filter + Internal Relief | The “all-in-one” choice for mission-critical positioners. |
Key Performance Advantages
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Smart Bleed™ Technology: This is a safety-critical internal check valve. If supply pressure is lost, the Smart Bleed system automatically exhausts the downstream (outlet) pressure. This prevents instruments from being trapped in an active state during a system failure.
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Extreme Temperature Resilience: While standard NBR seals handle -40°F, the specialized Arctic construction uses Silicone (VMQ) diaphragms to remain functional down to -76°F (-60°C).
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Compact & Panel-Ready: Its small footprint and optional panel-mounting nut make it the preferred choice for installation inside instrument cabinets or directly onto control valve actuators.
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Corrosion Resistance: All fasteners are treated for durability. For offshore or highly corrosive chemical environments, the 67CS Stainless Steel variants provide the highest level of material integrity.
Technical Specifications
| Feature | Aluminum (67C) | Stainless Steel (67CS) |
| Max Inlet Pressure | 250 psig (17.2 bar) | 400 psig (27.6 bar) |
| Connection Size | 1/4 NPT | 1/4 NPT |
| Body Weight | ~1.0 lb (0.5 kg) | 2.5 to 4.0 lbs (1.1 to 1.8 kg) |
| Max Emergency Outlet | 50 psi over setpoint | 50 psi over setpoint |
Xi’an Yunrui Trading Co., Ltd. Support
As specialists in Fisher instrumentation, Xi’an Yunrui Trading Co., Ltd. assists in selecting the exact elastomer (NBR, FKM, or Silicone) and configuration for your specific process conditions. We ensure your supply regulators are matched to your positioner requirements to prevent control loop oscillation.
