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Valve Position Transmitter is defined as one of control valve accessory which is used to monitor continuous valve position and transmit to controller such as DCS or PLC. The actual valve position or valve position feedback is measured using position transducer which converts stem travel into standard electrical signal such as (4-20) mA or (1-5) …
Quick exhaust valve provides rapid exhaust of control air when placed between control valve and actuator. These quick exhausts are required when fast valve closing/ opening is required based on process requirement such as surge valve application. They can also be used as shuttle valves. A figure showing Quick exhaust with its internal diagram & …
Air Lock valve (SMC) is used to hold the operating air inside actuator chamber to not make any disturbance in valve opening when any Pneumatic air supply or source failure occurs in the air operated process control line. A lock up relay is showing in figure- Wheather the valve is set for direct acting or …
Booster relays (From SMC), sometimes called as volume boosters are pneumatic devices designed to reproduce a pneumatic pressure signal (1:1 ratio), but with far greater output flow capacity. Volume boosters are typically increase volume / flow of instrument air supply for faster control valve operation. A diagram of booster relay is shown below- Working principle …
Smart Positioners are digital valve controllers based on microprocessor with internal logic capabilities and advance diagnostics features. These smart positioners have capabilities of automatic configuration & calibration. These valve positioners perform faster diagnostics which can be carried out through DCS, PC Software tool, Handheld & remote communicator. A diagnostics data may include installation, calibration leak …
Valve Positioner (From Emerson) is the most common type control valve accessories used in wide industrial application. A positioner is a motion-control device which is designed to actively compare valve stem position feedback against the control signal, adjusting pressure to the actuator diaphragm or piston until the correct stem position is reached. A typical valve …
I to H converter (from Voith) , also called as “current to hydraulic pressure” converter or I/H Transducer or Electro-Hydraulic converter, converts an electronic signal (analog output), typically from a control system such as PLC or DCS, to a hydraulic signal used to control hydraulic piston cylinder that actuates the control valve. This signal from …
I to P converter (From Emerson) is also called as “current to pressure” converter or I/P Transducer or Electro-pneumatic Converter which converts an electronic signal (analog output), typically from a control system such as PLC or DCS, to a pneumatic signal used to control a valve. This signal from the control system is typically analog …
Filter Regulator Lubricator combines a filter, regulator, and lubricator into one component to keep pneumatic systems in optimal working condition. This is also called as FRL or FLR. Since air from the compressor contains dust from the ambient atmosphere, condensed water, rust and dirt. These are undesired by-products of compressed and transmitted air. For the …
Air filter Regulator (AFR) should be the first component at the inlet of most air circuits like control valves. Air filter regulators are combination of a filter unit with pressure regulator assembly to provide neat and clean regulated air. Since air supply to actuator and other accessories such as I/P converter, positioner, solenoid valve, Booster …