How it Works
Emerson
Loading...
Fisher 2625
Data Sheet
8 pgs198.16 Kb0
Instruction Manual
12 pgs221.32 Kb0

Emerson Fisher 2625, Fisher 2625NS Data Sheet

Download
Product Bulletin
2625 Volume Booster
D200071X012
62.3:2625
January 2015
Fisherr 2625 and 2625NS Volume Boosters
A Fisher 2625 or 2625NS volume booster 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.
W4727-1
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 only with an actuator, for on‐off control, the integral bypass restriction on the booster must be closed (turned fully clockwise).
Connectors and piping can be installed with either 2625 or 2625NS volume booster for diagnostic testing.
The 2625 is 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.
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
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
Instrumented System (SIS) applications.
www.Fisher.com
Product Bulletin
62.3:2625 January 2015
Specifications
2625 Volume Booster
D200071X012
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 supply ranges. When Normally Used With Diaphragm Actuators: Up to 2.8 bar (40 psig) When Normally Used With Piston Actuators: Up to
10.3 bar (150 psig)
Input Signal Pressure
Positioner output
Maximum Input Signal Pressure
10.3 bar (150 psig)
Fixed Input‐to‐Output Pressure Ratio
1 to 1
Nominal Deadband
Percent of Positioner Output Span
(1)
:
2.4 mm (0.094 inch) exhaust port: 2%
9.5 mm (0.375 inch) exhaust port: 3.5%
12.7 mm (0.5 inch) exhaust port: 5%
Upper and Lower Valves:
2625: Nitrile‐CSM rubber/aluminum/stainless steel 2625NS: EPDM/aluminum/stainless steel
O‐Rings:
2625: Nitrile 2625NS: EPDM
Connectors for Diagnostic Testing: or
J brass
Operative Temperature Limits
J Stainless steel
(2)
2625: -40 to 71_C (-40 to 160_F) 2625NS: -40 to 93_C (-40 to 200_F)
Connections
Input Signal: 1/4 NPT Supply and Output: 3/4 NPT
Port Diameters
(3)
Supply Port: J9.5 mm (0.375 inch) or
J 12.7 mm (0.5 inch)
Exhaust Port:
J9.5 mm (0.375 inch) or J12.7 mm (0.5 inch)
J2.4 mm (0.094 inch),
Maximum Flow Coefficients
See table 1
Hazardous Area Classification
Complies with the requirements of ATEX Group II Category 2 Gas and Dust
Construction Materials
Body: Aluminum Seat Ring: Brass
Diaphragms
2625: Nitrile/nylon 2625NS: EPDM/meta‐aramid
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 should not be exceeded.
3. May be used in any combination.
2
Safety Instrumented System Classification
SIL3 capable - certified by exida Consulting LLC
Approximate Weight
2.3 kg (5 lb)
2625 Volume Booster
D200071X012
Figure 1. Sectional View of Fisher 2625 Volume Booster
INPUT SIGNAL
DIAPHRAGMS
EXHAUST PORT
EXHAUST
Product Bulletin
62.3:2625
January 2015
BYPASS RESTRICTION ADJUSTING SCREW
BYPASS RESTRICTION
SUPPLY PORT
SUPPLY
W0679‐1
Principle of Operation
Refer to figures 1 and 2. Because of the bypass restriction, large input signal changes register on the booster input diaphragm sooner than in the actuator. A large, sudden change in input signal causes a pressure differential to exist between the input signal and the output of the booster. When this occurs, he diaphragms move to open either the supply port or the exhaust port, whichever action is required to reduce
OUTPUT TO ACTUATOR
the differential. The port remains open until the difference between the booster input and output pressures returns to within the deadband limit of the booster. With the bypass restriction adjusted for stable operation, a signal with small magnitude and rate changes passes through the bypass restriction and into the actuator without initiating booster operation.
Both supply and exhaust ports remain closed, preventing unnecessary air consumption and possible saturation of positioner relays.
3
Product Bulletin
62.3:2625 January 2015
Figure 2. Typical Installations
SIGNAL
OUTPUT A
OUTPUT B
2625 VOLUME BOOSTER
DIGITAL VALVE CONTROLLER
ACTUATOR
2625 VOLUME BOOSTER
67D, 67DR OR 95H
SUPPLY
2625 Volume Booster
D200071X012
2625 VOLUME BOOSTER
POSITIONER OUTPUT
E1407
WITH A PISTON ACTUATOR
POSITIONER
ACTUATOR
A0794‐3
67D, 67DR OR 95H
WITH A DIAPHRAGM ACTUATOR
Note: 1 Connection location for diagnostic testing
Table 1. Maximum Flow Coefficients
PORT SIZE COMBINATIONS COEFFICIENTS
Supply Port Exhaust Port Supply Port Exhaust Port
mm Inch mm Inch C
9.5 3/8
12.7 1/2
FIELDVUEt DVC6200, DVC6200 SIS, DVC6200f, DVC6200p, DVC6000, DVC6000 SIS, DVC6000f digital valve controllers
FIELDVUE DVC2000 digital valve controller Low Pressure Relay High Pressure Relay
Fisher 3570 valve positioner 0.25 0.25
Fisher 3582 valve positioner 0.17 0.19
Fisher 3610J, 3610JP, 3611JP, 3620J, 3620JP, 3621JP valve positioners 0.37 0.30
1. Consult your Emerson Process Management sales office for special stroking speed requirements.
(1)
2.4
9.5
12.7
2.4
9.5
12.7
3/32
3/8 1/2
3/32
3/8 1/2
v
3.74
3.74
3.74
4.98
4.98
4.98
0.37 0.31
0.13
0.19
C
0.23
2.29
3.40
0.24
2.30
3.40
0.15
0.20
SIGNAL
SUPPLY
v
4
2625 Volume Booster
D200071X012
Figure 3. Dimensions
1/4‐18 NPT INPUT CONN
9 EXHAUST HOLES 7 (0.28) DIA
Product Bulletin
62.3:2625
January 2015
21
(0.84)
111
(4.38)
3/4‐14 NPT SUPPLY CONN
60
(2.38)
A0807‐3
(4.75)
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.
48
(1.88)
3/4‐14 NPT OUTPUT TO ACTUATOR
121
mm
(INCH)
Both the 2625 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 operability testing has been done to qualify both versions as rigid items at levels up to 9g's uniaxial (in each axis). Further nuclear service qualification data is available on request.
5
Product Bulletin
62.3:2625 January 2015
2625 Volume Booster
D200071X012
Installation
Figure 2 shows typical installations for the 2625 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.
Note
Use a clean, dry, oil‐free air supply with instruments containing EPDM components. EPDM is subject to degradation when exposed to petroleum‐base lubricants.
Keep in mind that many actuators require larger casing or cylinder connections to take full advantage of the booster's ability to deliver its high‐volume output. Dimensions are shown in figure 3. Ensure that the supply pressure is connected to correspond with the flow arrow on the booster.
Ordering Information
When ordering, specify:
1. Supply and exhaust port sizes. See table 1 for Cv values.
2. Supply pressure range of up to 2.8 bar (40 psig) or up to 10.3 bar (150 psig).
3. Stroking speed information when being mounted at the factory, for proper tuning of the instruments. Specify either critical or non‐critical stroke speed time.
Note
Critical stroke speed time example: Valve to stroke in both directions in 4 seconds or less.
Non‐critical stroke speed time example: Valve to stroke in approximately 4 seconds in both directions.
4. Nuclear service, if applicable. Consult your Emerson Process Management sales office for ordering assistance.
6
2625 Volume Booster
D200071X012
Product Bulletin
62.3:2625
January 2015
7
Product Bulletin
62.3:2625 January 2015
2625 Volume Booster
D200071X012
Neither Emerson, Emerson Process Management, 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 Process Management business unit of Emerson Electric Co. Emerson Process Management, 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 contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not to be construed as warranties or guarantees, express or implied, regarding the products or services described herein or their use or applicability. All sales are governed by our terms and conditions, which are available upon request. We reserve the right to modify or improve the designs or specifications of such products at any time without notice.
Emerson Process Management
Marshalltown, Iowa 50158 USA Sorocaba, 18087 Brazil Chatham, Kent ME4 4QZ UK Dubai, United Arab Emirates Singapore 128461 Singapore
www.Fisher.com
E 1986, 2015 Fisher Controls International LLC. All rights reserved.
8
Loading...
Buy Points How it Works FAQ Contact Us Questions and Suggestions Privacy Policy Cookie Policy Terms of Use