Urea letdown valve tolerates high pressure drops

Urea letdown valve from Flowserve Corp. is designed to tolerate the high pressure drops and crystallization associated with the letdown process in urea production.


Process Control

Urea letdown valve from Flowserve Corp. tolerates the high pressure drops and crystallization associated with the letdown process in urea production.

Urea letdown valve from Flowserve Corp . is designed to tolerate the high pressure drops and crystallization associated with the letdown process in urea production. Valve is robust and rugged with double top-stem guiding, single-point throttling, a single-piece plug, and a clean and streamlined exit. Design is said to minimize vibration, noise, sticking, and plugging common to valves not specifically made to work in urea letdown.

Urea is a common chemical reactant and precursor used in the production of other chemicals and materials, including fertilizers, resins, plastics, and paper. Produced at high temperatures and pressures, it is highly corrosive and erosive. The urea letdown process happens near the end of the production cycle, where pressure is reduced to a more easily handled state. Typical urea production conditions include an inlet pressure of 3,500 psig, an outlet pressure of 300 psig, an operating temperature of 350 °F, and a flow rate of 8 million scfh. A 4-in ANSI Class 2500 valve would be typical for this process.

Valve is made of 316 stainless steel and features a specially shaped Venturi seat ring, sweep-angle design, advanced velocity control, straight-shot exit, and an oversized gallery. The elements reportedly help mitigate the erosive effects of the continuous, high-velocity flow of urea, which may also contain entrained particulates. It is available in 1-4-in. sizes and comes standard with a Flowserve VL cylinder actuator. Valve is compatible with nearly any four-way digital or analog positioner.

—Jeanine Katzel, senior editor, Control Engineering, jkatzel@reedbusiness.com

No comments
The Engineers' Choice Awards highlight some of the best new control, instrumentation and automation products as chosen by...
The System Integrator Giants program lists the top 100 system integrators among companies listed in CFE Media's Global System Integrator Database.
The Engineering Leaders Under 40 program identifies and gives recognition to young engineers who...
This eGuide illustrates solutions, applications and benefits of machine vision systems.
Learn how to increase device reliability in harsh environments and decrease unplanned system downtime.
This eGuide contains a series of articles and videos that considers theoretical and practical; immediate needs and a look into the future.
Make Big Data and Industrial Internet of Things work for you, 2017 Engineers' Choice Finalists, Avoid control design pitfalls, Managing IIoT processes
Engineering Leaders Under 40; System integration improving packaging operation; Process sensing; PID velocity; Cybersecurity and functional safety
Mobile HMI; PID tuning tips; Mechatronics; Intelligent project management; Cybersecurity in Russia; Engineering education; Road to IANA
This article collection contains several articles on the Industrial Internet of Things (IIoT) and how it is transforming manufacturing.

Find and connect with the most suitable service provider for your unique application. Start searching the Global System Integrator Database Now!

SCADA at the junction, Managing risk through maintenance, Moving at the speed of data
Flexible offshore fire protection; Big Data's impact on operations; Bridging the skills gap; Identifying security risks
The digital oilfield: Utilizing Big Data can yield big savings; Virtualization a real solution; Tracking SIS performance
click me