Rotork Fairchild Model 1000 No-Bleed Precision Pressure Regulator
Overview
The Rotork Fairchild Model 1000 is a precision pressure regulator for control and instrument air systems that need steady downstream pressure, large forward flow and good exhaust capacity. Fairchild regulators are known in process plants for loading control valve actuators, and the Model 1000 is built to deliver precise regulation with a compact body. Rotork describes it as a no-bleed design, so it does not consume air at rest, and its pilot valve action makes the set point nearly immune to variations in supply pressure.
Seven Star LLC supplies the Rotork Fairchild Model 1000 to instrumentation contractors, valve service shops and plant maintenance departments across the Sultanate of Oman and the GCC. Our Muscat team can check catalog numbers against the pressure range, port size and thread option, and help buyers who need to replace a legacy Fairchild regulator with a like-for-like model.
Operating Principle
The Rotork Fairchild Model 1000 works as an indirect, pilot-operated regulator. A knob and spring set the desired pressure on a diaphragm assembly. When downstream pressure moves away from the set point, the diaphragm positions a small pilot valve, and the pilot valve drives a larger valve motor that opens or closes the main supply valve. This amplifies the correcting force so that the supply valve is positioned with great sensitivity and maintains a constant pressure drop across itself, which is why changes in supply pressure barely disturb the output.
Flow compensation comes from an aspirator tube. Venturi action in the tube compensates for the downstream pressure droop that normally appears as flow increases, so the regulated pressure remains stable under demand. A control chamber isolates the diaphragm from the flow, which removes the hunting and buzzing that can occur in simpler regulators.
Engineering Design of the Rotork Fairchild Model 1000
The Rotork Fairchild Model 1000 has a zinc body, Buna N and Dacron diaphragms, and trim made of aluminium, brass, neoprene and zinc-plated steel. Port sizes are one quarter inch or three eighths inch NPT, with BSPP parallel or BSPT tapered thread options for the inlet and outlet ports, and a tamper-proof option prevents the set point being changed by accident or by hand. The sensitive valve motor and pilot are compact, which is why the regulator fits in tight instrument panels and valve-top positions.
Ambient temperature limits are -40 to +200 °F (-40 to +93.3 °C), and the brochure lists acceptance for gas atmospheres in Zones 1 and 2 (Groups IIA and IIB) and dust atmospheres in Zones 21 and 22. A service kit is available, and the Fairchild installation, operation and maintenance instructions describe how to rebuild the unit, which supports a low cost of ownership.
Key Features
The Rotork Fairchild Model 1000 addresses stability and low air consumption in control loops. Key features of the Rotork Fairchild Model 1000 include:
- No-bleed operation that minimises consumption of air or inert gas.
- Pilot valve and valve motor arrangement that avoids unbalanced closing forces in the inner valve.
- Venturi-type aspirator tube that compensates downstream pressure droop under flow.
- Control chamber that isolates the diaphragm and removes hunting and buzzing.
- Flow capacity of 50 SCFM (85 cubic metres per hour) and sensitivity of about 0.5 inch water column.
- Four output ranges from 0.5 to 10 psig up to 2 to 150 psig, with maximum supply pressure of 250 psig.
- Compact size for crowded instrument panels, with 1/4 inch or 3/8 inch NPT ports and BSP options.
- Service kit availability and tamper-proof option for maintenance and security.
Industrial Applications
The Rotork Fairchild Model 1000 is commonly chosen to load control valve actuators, operate clutch and brake devices, run calender and winding rolls, and supply constant pressure to pneumatic instruments. In an Omani process plant, instrument air headers feed hundreds of positioners and transmitters, and a no-bleed regulator in a skid or a local panel keeps the consumption low while holding a steady set point. Maintenance teams who already stock the Norgren Excelon filter regulator can use the Rotork Fairchild Model 1000 where higher sensitivity and flow stability are needed than a general-purpose unit offers.
Seven Star LLC supplies the Rotork Fairchild Model 1000 to refineries, power stations, desalination plants and OEM panel builders in the Sohar and Salalah economic zones, with engineering support in Muscat. Teams replacing a Fisher 67C supply regulator in a positioner loop, or reviewing an SMC AW20 regulator that cannot hold the required accuracy, can ask us for a technical comparison.
Technical Specifications
The table below lists the specifications of the Rotork Fairchild Model 1000 from the Rotork brochure. Catalog number codes define pressure range, port size and options.
| Parameter | Specification |
|---|---|
| Model | Rotork Fairchild Model 1000 precision pressure regulator, no-bleed |
| Flow capacity | 50 SCFM (85 m3/hr) at 100 psig supply, 20 psig set point |
| Exhaust capacity | 8 SCFM (13.6 m3/hr) at 5 psig over set pressure |
| Pressure ranges | 0.5-10, 0.5-30, 1-60 and 2-150 psig |
| Maximum supply pressure | 250 psig (17.0 bar) |
| Sensitivity | 0.5 inch (1.27 cm) water column |
| Supply pressure effect | 0.1 psig per 100 psig change |
| Ambient temperature | -40 to +200 °F (-40 to +93.3 °C) |
| Port sizes | 1/4 inch or 3/8 inch NPT; BSPP or BSPT options |
| Hazardous locations | Zones 1 and 2 gas (IIA, IIB); Zones 21 and 22 dust |
| Body and diaphragm | Zinc body; Buna N and Dacron diaphragms |
| Options | Tamper proof, BSP threads, service kit |
Request a Quote for Rotork Fairchild Model 1000
Request pricing for the Rotork Fairchild Model 1000 by sending Seven Star LLC the catalog number or the required pressure range, port size, thread type and quantity. Our instrumentation division in Muscat will confirm the variant, offer alternatives such as the Model 10 or Model 100 where required, and attach the Rotork brochure to the quotation. Seven Star LLC supplies Rotork Fairchild equipment on request with local engineering support across Oman and the GCC, so submit your RFQ today.
- Brochure Rotork Fairchild Model 1000 No Bleed Pressure Regulator Product Brochure Download
Rotork product families on this page
The IQ3 is the intelligent multi-turn electric actuator for gate, globe and sluice valves, and the IQT3 is its part-turn counterpart for ball, butterfly and plug valves. For control valves there are the CVA and CMA electric actuators, built for continuous modulating duty. The Skilmatic SI3 is a self-contained electro-hydraulic actuator used where a fail-safe stroke is required. On the fluid power side the page lists GP/GH scotch yoke pneumatic and hydraulic actuators and the CP compact pneumatic quarter-turn unit. Two instrument brands sold under the Rotork name complete the list: Fairchild, with the Model 1000 no-bleed precision regulator, and YTC, with the YT-1000 electro-pneumatic and YT-3300 smart positioners.Where Rotork actuators are used
Typical duties are isolation and block valves on pipelines and tank farms, motor-operated valves in refineries and power plants, sluice gates and large butterfly valves in water and wastewater works, and emergency shutdown valves on oil and gas facilities across the GCC.Ordering Rotork actuators and parts: what we need
For an existing unit, send the serial number and the wiring diagram number from the nameplate; these two identify the exact build. For a new selection we need the valve type and size, torque or thrust, stem or shaft details, operating time, supply voltage, phase and frequency, the hazardous area certification, and any bus or remote control option. For pneumatic units add the air supply pressure and the fail position.Browse Rotork products by category: Valve Positioner, Valve Actuator.
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