Valve Magazine


Last updateFri, 02 Oct 2015 9am

The Case for a Severe Service Standard

The Case for a Severe Service Standard

At this time, no national standards exist that cle...

Commercial Construction on the Rise

Commercial Construction on the Rise

“While single family building normally dominates t...

Adding Value through Positioner Diagnostics

Adding Value through Positioner Diagnostics

Industrial plants are tasked with reducing costs a...

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U.S. Added 142,000 Jobs in September

1 DAY AGO  |  Chris Guy

Total nonfarm payroll employment increased by 142,000 in September, and the unemployment rate was unchanged at 5.1%, the U.S. Bureau of Labor Statisti...

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Emerson’s Fisher VBL Booster

emerson fisher vbl pneumatic volume boosterEmerson Process Management’s new Fisher® VBL booster incorporates a fixed deadband, internal soft seats and an integral bypass restriction that combine to eliminate the positioner problems typically caused by boosters without these design features.


The new booster’s enhanced performance capability proves highly important in applications where a valve positioner alone cannot provide the stroking speed needed to meet rapidly changing process conditions and demands.

The new booster design features internal soft seats that yield tight shutoff to reduce unnecessary air consumption and eliminate saturation of positioner relays.

Adding to the VBL’s superior performance is its bypass restriction that enables fast actuator response. The restriction also allows tuning valve response to follow slow signal changes or provide on/off control. This fine-tuning capability does not impact booster deadband.

Compact and lightweight in design, the VBL booster features an aluminum body with ¼ NPT input and ½ NPT connections. Internal diaphragms, upper and lower valves, and O-rings are of HNBR. Maximum input signal pressure is 10.3 bar (150 psig) with an input to output ratio being fixed at 1:1.

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Valve Magazine Digital Edition

Valve Magazine Summer 2015Inside the Summer 2015 issue…

• Critical Service
• Effects of Flashing/Cavitation
• Coatings and Wastewater Apps
• The Latest in R&D