In automated control systems, a stable and clean air supply is essential for the long-term operation of instruments. Fisher 67CFR and 67CFSR series filter regulators, manufactured by Emerson, have become the industry standard in global process control due to their superior pressure regulation accuracy and rugged industrial design.
Xi’an Yunrui Trading Co., Ltd. currently maintains a large stock of 67CFR and 67CFSR units. Whether you require a standard 0-60 psi range or a high-pressure 0-125 psi output, we offer competitive pricing and immediate worldwide shipping.
Large inventory of Fisher 67CFR and 67CFSR filter regulators ready for rapid dispatch from Xi’an Yunrui Trading Co., Ltd.
What are Fisher 67CFR and 67CFSR?
These products are direct-operated filter regulators used to provide constant air supply pressure to pneumatic positioners, transducers, and other control devices. The primary differences lie in their construction and internal features:
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67CFR: The standard filter regulator featuring internal relief. It releases minor downstream overpressure to protect expensive downstream instrumentation.
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67CFSR: Constructed with stainless steel or specialized corrosion-resistant coatings, making it ideal for harsh environments such as offshore platforms and chemical plants.
Fisher 67CFR and 67CFSR Genuine original equipment designed for durability in demanding industrial conditions.Operating Principle: Force Balance for Stable Pressure
The Fisher 67C series operates on a precise force-balance principle to achieve steady regulation:
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Pressure Inlet: Unfiltered high-pressure air enters the valve body.
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Filtration: Air passes through an internal 40-micron filter element, effectively trapping moisture, oil, and solid particles.
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Force Balance Regulation: When downstream pressure drops below the setpoint, the main spring pushes the diaphragm and valve plug downward to increase flow. Once downstream pressure reaches the setpoint, the force acting on the bottom of the diaphragm counteracts the spring force, closing the valve plug.
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Automatic Relief: If downstream pressure increases due to temperature changes or other factors, the center orifice in the diaphragm opens automatically to vent excess pressure to the atmosphere.
Top view of the Fisher 67CFR. The clear nameplate and adjustment bolt allow for easy pressure setting and identification.Maintenance Manual: Three Steps to Extend Service Life
Regular maintenance ensures instrument accuracy and prevents unexpected production downtime.
1. Regular Condensate Drainage
A manual drain valve is located at the bottom of the filter bowl (the silver bolt shown at the bottom of the unit). It is recommended to open this weekly to discharge any accumulated moisture or oil.
2. Inspect and Replace the Filter Element
If downstream pressure response becomes sluggish or flow is restricted, the filter element is likely clogged. To inspect, shut off the air supply, release spring tension, and unscrew the filter bowl. Because original Fisher filters are made of fiber, they should be replaced rather than cleaned to ensure effective filtration.
3. Diaphragm and Seal Inspection
An annual overhaul is recommended to check the diaphragm for cracks or hardening. Thanks to the simple design of the 67C series, disassembly and assembly can be completed with basic tools.
Procurement Advice
While many look-alike products exist on the market, genuine Fisher regulators offer relief precision and filter longevity that imitations cannot match. To ensure the safety of your equipment, please rely on original Fisher stock provided by Xi’an Yunrui Trading Co., Ltd.
Fisher 67C series Model Code Breakdown
67CFR 67CFSR 67CFR-239 67CFR-235
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