High-flow valve PULSE HF

PULSE HF ultrasonic chemical injection metering valves (CIMVs) are intended to inject MEG and methanol as part of a hydrate mitigation strategy at sea. They were created to cope with contaminated regenerated MEG. The heart of this CIMV technology is a large-bore, nonintrusive, line-of-sight ultrasonic flowmeter. These high-flow CIMVs’ strong, particulate-tolerant properties obviate the need for MEG or methanol subsea filtration.


The ultrasonic pulse is fired both with and against the flow, and the difference in flight time between the two directions is monitored using a large-bore, line-of-sight flowmeter. The timing difference indicates the fluid’s speed, allowing the flow rate to be precisely determined. As with the PULSE LF low-flow ultrasonic CIMV, a secondary flow measurement system is incorporated as standard; it consists of two pressure sensors across the throttling valve and a rotary variable differential transformer (RVDT) to provide valve position. Using system-level processing, the data may subsequently be translated to flow rates. To offer an erosion-resistant throttling element, the PULSE HF CIMV employs field-proven multiple orifice valve (MOV) choke trim technology. Two sintered and hot isostatic pressed (HIP) tungsten carbide discs, one stationary and the other moved by a stepper motor through a gear train, make up the MOV trim.