The Fisher 2625, 2625SST, and 2625NS volume boosters are used in conjunction with a positioner on a throttling control valve to increase stroking speed. The 2625SST is a 316 stainless steel version for use in corrosive environments. The 2625 and 2625SST boosters are certified as SIL 3 capable for SIS applications. The 2625NS is a nuclear service version that uses special elastomeric components to better withstand high temperature and radiation environments. The boosters incorporate fixed deadband, soft seat construction, and an integral bypass restriction to eliminate positioner saturation problems that can occur with volume boosters that do not have these features.


Features & Benefits
Fast Response—Booster delivers the volume needed for rapid actuator stroking when large input changes suddenly occur.
Adjustable Response—Integral bypass restriction tunes the booster response so that smooth actuator motion follows the slow signal changes.
Efficient Operation—Soft seats provide tight shutoff to reduce unnecessary air consumption and eliminate saturation of positioner relays.
Maintains Accuracy—Booster permits high actuator stroking speeds upon demand without degrading the positioner steady-state accuracy.
Exida SIS Certified - Certified as SIL 3 capable for SIS applications.
2625SST - Optional 316 stainless steel construction for corrosive environments.

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  Fisher 2625, 2625SST, and 2625NS Volume Boosters
  204 KB
  United States