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www.Fisher.comFisher™ 2625, 2625SST, and 2625NS VolumeBoosters

www.Fisher.comFisher™ 2625, 2625SST, and 2625NS VolumeBoosters
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www.Fisher.comFisher™ 2625, 2625SST, and 2625NS VolumeBoosters - 1

Product Bulletin Fisher™ 2625, 2625SST, and 2625NS Volume Boosters A Fisher 2625, 2625SST, or 2625NS volume booster is part of the 2625 Series volume boosters and is used in conjunction with a positioner on a throttling control valve to increase stroking speed. The 2625NS is a nuclear‐service version and uses elastomeric components that better withstand high temperature and radiation environments. The booster incorporates 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. Adjustment of the integral bypass restriction is necessary for system stability. This adjustment does not affect the deadband of the volume booster, but does permit the control valve to respond to small input signal changes without sacrificing steady‐state accuracy. It also allows the booster to deliver high‐volume output for fast stroking when large, rapid input signal changes occur. The volume booster is used to improve stroking speed. If precision valve control is required, the use of a positioner is recommended. If the volume booster is to be used for on/off control, the integral bypass restriction on the booster must be closed (turned fully clockwise). Features n Fast Response—Booster delivers the volume needed for rapid actuator stroking when large input changes suddenly occur. n Adjustable Response—Integral bypass restriction Connectors and piping can be installed with either 2625, 2625SST, or 2625NS volume booster for diagnostic testing. The 2625 and 2625SST are certified for use in Safety Instrumented System (SIS) applications. Certification is by exida Consulting LLC, a global provider of functional safety and control system security. SIS certification is identified on the product by the EXIDA logo on the 2625 nameplate. tunes the booster response so that smooth actuator motion follows the slow signal changes. n Efficient Operation—Soft seats provide tight shutoff to reduce unnecessary air consumption and eliminate saturation of positioner relays. n Maintains Accuracy—Booster permits high actuator stroking speeds upon demand without degrading the positioner steady‐state accuracy. n SIL 3 Capable - Certified for use in Safety

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www.Fisher.comFisher™ 2625, 2625SST, and 2625NS VolumeBoosters - 2

Product Bulletin Specifications O‐Rings 2625 and 2625SST Standard: Nitrile High Temperature: FKM 2625 Low Temperature: FVMQ 2625NS: EPDM Supply Pressure Ranges When used in conjunction with a positioner or other pneumatic accessory, always pipe the positioner and volume booster with one common supply through a Fisher 67D, 67DR, or 95H regulator (see figure 2). A high‐capacity filter, such as the Fisher 262K, should be installed in the supply line to the regulator. Supply pressure also must not exceed the maximum pressure rating of the actuator. Constructions are available in two maximum...

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www.Fisher.comFisher™ 2625, 2625SST, and 2625NS VolumeBoosters - 3

Product Bulletin Specifications (continued) Hazardous Area Classification (continued) Meets Customs Union technical regulation TP TC 012/2011 for Groups II/III Category 2 equipment II Gb c T*X III Db c T*X Safety Instrumented System Classification SIL3 capable - certified by exida Consulting LLC Approximate Weight Aluminum: 2.3 kg (5 lb) Stainless Steel: 4.8 kg (10.6 lb) NOTE: Specialized instrument terms are defined in ANSI/ISA Standard 51.1 - Process Instrument Terminology. 1. Zero to maximum supply. 2. The pressure/temperature limits in this document and any applicable code or standard...

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www.Fisher.comFisher™ 2625, 2625SST, and 2625NS VolumeBoosters - 4

Product Bulletin Figure 2. Typical Installations VOLUME BOOSTER VOLUME BOOSTER SUPPLY OUTPUT A VOLUME BOOSTER POSITIONER OUTPUT DIGITAL VALVE CONTROLLER ACTUATOR E1407 WITH A PISTON ACTUATOR WITH A DIAPHRAGM ACTUATOR Note: 1 Connection location for diagnostic testing Table 1. Maximum Flow Coefficients(1) PORT SIZE COMBINATIONS Supply Port mm COEFFICIENTS Exhaust Port Supply Port Exhaust Port FIELDVUE DVC2000 digital valve controller Low Pressure Relay High Pressure Relay Fisher 3570 valve positioner Fisher 3582 valve positioner 1. Consult your Emerson sales office for special stroking...

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www.Fisher.comFisher™ 2625, 2625SST, and 2625NS VolumeBoosters - 5

Product Bulletin 2625NS for Nuclear Service Applications The 2625NS volume booster uses EPDM (ethylene‐propylene) elastomeric parts. These parts have superior resistance to degradation at elevated temperature and radiation levels. This version is designed for nuclear service applications where oil‐free supply air is available. The 2625, 2625SST, and 2625NS are available as safety‐related items when processed using the commercial grade dedication section of the 10CFR50, Appendix B, quality assurance program. 10CFR21 reporting is also part of the safety related processing program. Seismic...

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www.Fisher.comFisher™ 2625, 2625SST, and 2625NS VolumeBoosters - 6

Installation Figure 2 shows typical installations for the 2625, 2625SST, or 2625NS volume booster on piston and diaphragm actuators. A single regulator that supplies both the positioner and booster (or boosters) is recommended. The supply medium must be clean, dry, oil‐free air or non‐corrosive gas. Ordering Information When ordering, specify: 1. Aluminum or stainless steel 2. Supply and exhaust port sizes. See table 1 for Cv values. 3. Supply pressure range of up to 2.8 bar (40 psig) or up to 10.3 bar (150 psig). Note Use a clean, dry, oil‐free air supply with instruments containing EPDM...

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www.Fisher.comFisher™ 2625, 2625SST, and 2625NS VolumeBoosters - 8

Neither Emerson, Emerson Automation Solutions, nor any of their affiliated entities assumes responsibility for the selection, use or maintenance of any product. Responsibility for proper selection, use, and maintenance of any product remains solely with the purchaser and end user. Fisher and FIELDVUE are marks owned by one of the companies in the Emerson Automation Solutions business unit of Emerson Electric Co. Emerson Automation Solutions, Emerson, and the Emerson logo are trademarks and service marks of Emerson Electric Co. All other marks are the property of their respective owners. The...

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