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AMHERST, NH, USA – September 2009 – – ControlAir Inc. is pleased to announce the introduction of the NEW Type-250 Lock-up Air Relay. This unit is designed for fail in place applications of control valves when air supply drops below acceptable pressure levels. Valve or damper position is maintained by capturing air pressure inside the diaphragm chamber (or piston cylinder) of the actuator, when the supply pressure falls below the desired set value.
The Type-250 Lock-up Air Relay is designed so that when supply air pressure falls below the set value (cut-off-point) the unit traps the air pressure in the diaphragm chamber of the actuator. The cut-off set point is set to a desired value by compressing the spring adjusting screw. The cut-off set point is adjustable and is generally set at a higher value than required for operating the control valve. If the actuator spring range is 3-15 psig (0.2-1.0 BAR), the cut-off set point could be set at 20 psig (1.35 BAR), for example. Its optional construction of 304 stainless steel prevents corrosion while stainless internal parts defend against wear and corrosive gases.
The Type-250 Lock-up Air Relay is designed to provide reliability for fail in place applications in harsh environments. The unit maintains a desired air set-point to valves, pneumatic controllers, transmitters, transducers, valve positioners, and a wide range of pneumatic control systems. The Type-250 is ideal for petrochemical processing, oil and gas platform applications, both on and offshore; food; pulp and paper; pharmaceutical processing; pollution control; wastewater treatment and research projects.
The Type-250 Lock-up Air Relay is available with 1/4” NPT porting. Cut-off pressure ranges include 15-60 (1-4 BAR) and 30-120 psig (2-8 BAR). Maximum supply pressure is 125 psig (8.35 BAR). Standard mounting bracket is included which allows for easy installation. Temperature limits range from 0º to 160º F (-18º to 71º C). The aluminum Type-250Lock-up Air Relay weighs 2.1 lbs and the stainless steel version weighs 4 lbs.
ControlAir Inc. manufactures precision pneumatic and electro-pneumatic controls. ControlAir’s markets include process control, semiconductor, printing and converting presses, diagnostic and surgical medical equipment, robotics, quality control, automotive, analyzers, compressors, pumps and paint equipment. For more information, ControlAir’s website, www.controlair.com, offers full product specifications with pdf files, product CAD drawing files, and company profile.