Emerson Fisher 2625 Manuel d'instruction - Page 2
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2625, 2625SST, and 2625NS Volume Booster
September 2022
The 2625, 2625SST, and 2625NS volume boosters are used in conjunction with a positioner on a throttling control
valve to increase stroking speed. The booster has a fixed deadband (controlled by the seat‐to‐seat dimension of the
supply and exhaust plugs) which is factory set during assembly and testing. In addition, the booster incorporates
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 booster, but does permit the control valve to
respond to small input signal changes from the positioner 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 used for on/off control, the integral bypass restriction on the volume booster
must be closed (turned fully clockwise).
To facilitate diagnostic testing, connectors and piping may be installed with each 2625, 2625SST, and 2625NS volume
booster.
The 2625NS volume booster is designed for nuclear power applications. The 2625NS construction includes materials
that provide superior performance at elevated temperature and radiation levels.
The O‐rings in the 2625NS are EPDM (ethylene propylene) and the diaphragms are EPDM/meta‐aramid. EPDM
demonstrates superior temperature capability and shelf life over nitrile. The meta‐aramid diaphragm fabric
demonstrates improved strength retention at elevated temperature and radiation conditions.
NOTICE
Use a clean, dry, oil‐free air supply with instruments containing EPDM components. EPDM is subject to degradation when
exposed to petroleum based lubricants.
Under the 10CFR50, Appendix B, quality assurance program, the 2625NS volume booster is qualified "commercial
grade dedicated". These can be supplied as 10CFR, Part 21 items.
Specifications
Specifications for the 2625, 2625SST, and 2625NS volume booster are listed in table 1. Information for an individual
unit as it comes from the factory appears on the product nameplate.
Educational Services
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Phone: +1-800-338-8158
E-mail: [email protected]
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Instruction Manual
D100348X012