Valves, Actuators & Pump Control


Intelligent electropneumatic valve

September 2000 Valves, Actuators & Pump Control

Fairchild Industrial Products is offering the high flow, high pressure, intelligent electropneumatic valve model T7900. The unit comes in a number of pressure control ranges between 10 and 1000 kPa with flow capacities close to the model 4500 volume booster, up to 200 normal m3/h and various other features.

A built-in pressure sensor, for example, measures output pressure directly at the output port. A remote feedback option is available as well, making pressure measurement possible at a remote location. This pressure signal is subsequently available as 4 to 20 mA signal to the control system.

Output pressure control is done by the built-in PID controller receiving a 4-20 mA signal as setpoint from the control system.

The built-in PID controller can be tuned to the needs of the customer, making the change from the 4 to 20 mA input signal to the required pressure output signal as smooth as possible. The electronic valve is therefore equipped with a four button keypad to make tuning and calibration possible directly from the unit.

Especially in the paper industry the 420 mA output pressure signal, in combination with, for example, the remote pneumatic feedback option, makes it possible to keep track of any pressure losses in systems downstream from the electronic valve. This could be pressure losses, for example, in bellows used as in shoe presses or online coating systems. This way the customer notices immediately when there are any leaks in these systems.

The T7900's four button keypad and liquid crystal display allow easy on-site entry of operating parameters and the precise setting of tuning coefficients for a wide range of applications including machine tool automation and robotics. The display shows output pressure in either psig, bar or kPa.

In addition to the internal feedback sensor, a remote current or voltage feedbacks signal is also standard. Instead of the remote feedback sensor, adjustable dry contact high and low limit alarm relays are available as an option. A remote pneumatic feedback signal is also optional.

Nema 4X, IP65 and Type 4 enclosure allows use in outdoor or washdown applications and its RFI/EMI protection eliminates susceptibility to electromagnetic and radio interference.



Credit(s)



Share this article:
Share via emailShare via LinkedInPrint this page

Further reading:

Non-contact microwave limit switch
Allpronix Valves, Actuators & Pump Control
The MWS-ST/SR level switch’s use of the heterodyne detection method produces an output that is proportional to the received power level.

Read more...
ARCA retains BASF MVV status
Valve & Automation Valves, Actuators & Pump Control
The framework agreement will cement ARCA’s position as one of two global key suppliers for automated control valves to BASF.

Read more...
Wireless communication and control of electro-pneumatic manifolds and IO
SMC Corporation South Africa Valves, Actuators & Pump Control
SMC analysed the control of manifolds-in-motion, where the physical removal of communications cables is desirable. Applications include manifolds mounted on robot gripper assemblies or rotating tables. ...

Read more...
Valves for motorised open/close functions
Valves, Actuators & Pump Control
The valves’ robust, self-locking linear actuator has a safety switch-off function with overload protection, a manual override and an optical position indicator.

Read more...
Abrasive Flow Solutions celebrates 1st anniversary
News Valves, Actuators & Pump Control
The company specialises in the design and manufacture of slurry-related valves, and works closely with sister company, BMG.

Read more...
Actuator retrofit gives Indian airport critical performance data
Valves, Actuators & Pump Control
Since a reduction in downtime was of critical concern, the customer signed up to a service agreement as part of Rotork’s Lifetime Management programme.

Read more...
Rotork actuators installed at Beijing’s second international airport
Valves, Actuators & Pump Control
The pump room, oil tanks, oil station and landing field ground wells use the company’s actuators to operate a variety of valve types.

Read more...
Festo campaign highlights process automation solutions
Festo South Africa Valves, Actuators & Pump Control
Festo aims to aid its process automation customers to thrive even during unpredictable periods, by continually analysing the value-creation chain and communicating with its customers to understand their needs.

Read more...
Silencer to help protect workers from gas process noise
Emerson Automation Solutions Valves, Actuators & Pump Control
Fisher WhisperTube modal attenuator provides noise reduction in compressible fluid service to improve worker safety, with no impact to process flow.

Read more...
Flow control at US water resource recovery facility
Valves, Actuators & Pump Control
Rotork IQT part-turn electric actuators have been specified for use at the Water Resource Recovery Facility (WRRF) in Michigan, USA.

Read more...