Emerson Process Management Fisher VBL valve booster

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

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

The VBL also features a 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 finetuning capability does not impact booster deadband.

Compact and lightweight in design, the VBL booster features an aluminium 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 fixed at 1:1.