Emerson Booster Enables Faster Valve Response

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Emerson Process Management’s Fisher VBL booster incorporates a fixed deadband, internal soft seats and an integral bypass restriction.

The VBL’s enhanced performance capability is critical to applications where a valve positioner alone cannot provide the stroking speed required to meet rapidly changing process conditions. It features internal soft seats that yield tight shut-off; reducing unnecessary air consumption and eliminating saturation of positioner relays.

Bypass restriction allows tuning valve response to follow slow signal changes or provide on/off control. This fine-tuning capability does not impact the booster’s deadband.

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.