Gas-over-oil pipeline actuator
20 August 2010
Designed for high reliability, the Shafer SH Series of gas-over-oil valve actuators from Emerson Process Management has a long service life and is ideally suited to critical applications. Suited to automate valves used for gas transmission as well as at compressor stations, gathering plants, storage facilities, meter runs and many other applications.
Product in picture
The product has been designed for an ‘amazing’ fifty years of operation, the actuator has a 15 year seal life and a ten year, industry-leading warranty. The SH series actuator is operated by hydraulic oil, pressurised by the pipeline gas. Powering the actuator with oil prevents the internal corrosion associated with other actuator designs. The actuator is designed so that the gas is contained within two tanks, half filled with hydraulic oil. Contaminants and moisture in the gas settle to the bottom of the tank where they can be easily drained.
The actuators can be used for standard on/off service or as part of an Emergency Shutdown System (ESD). Three sizes of SH are available to suit DN 50 to 200 (2” to 8”) valves with a torque range between 254 Nm and 2034 Nm. Torque is evenly applied across the whole range of movement, making the SH Series ideal for plug and blowdown valves. The compact actuator package is operated by solenoid valves which are factory piped, ready for operation. A switch box provides open/closed feedback to the operator.