685SE and 685SR Actuators |
Product Bulletin |
61.2:685SE/685SR |
|
D103791X012 |
September 2014 |
|
|
Fisherr 685SE and 685SR Piston Actuators
The 685SE and 685SR are medium to large spring-return, double-acting piston actuators that provide accurate, high thrust output for short to long travel applications. These actuators are designed for use with a variety of medium to large Fisher slidingstem control valves including the easye™, FB, TBX,CVX, HP, EH, and 461.
These actuators feature an internal bias spring that forces the actuator piston rod to extend (685SE) or retract (685SR) upon a loss of supply pressure, thereby ensuring a fail-closed or fail-open mode of operation. This effectively eliminates the need for a trip valve and volume tank in most constructions.
Several configurations are available to cover a wide range of application requirements. Typical travels range from 25 to 610 mm (1 to 24 inches) and cylinder diameters range from 254 to 711 mm (10 to 28 inches).
The 685SE and 685SR can be used with the FIELDVUE™ DVC6200 digital valve controller for throttling applications, or with switching valves for onoff control. This actuator can also be fitted with volume boosters for fast stroking requirements.
X0993
Double Acting Construction — Pressure on both sides of the piston results in stiff, precise positioning.
Features
High Thrust Capability — Maximum thrusts of up to 354 kN (79,000 lbf) can be produced, when supply pressure is available.
Broad Application Coverage — Standard constructions offer travels of up to 610 mm (24 inches) and cylinder diameters of up to 711 mm (28 inches). Even larger constructions are available upon request.
Low Friction — Low friction piston seals and either chrome plated or fluoropolymer coated cylinder bores reduce sliding friction and wear.
Wide Temperature Range — Standard constructions offer a temperature range of -40 to 93_C (-40 to 200_F), however higher or lower temperatures are possible. Special constructions can operate as low as -54_C (65_F) and as high as 204_C (400_F).
Mechanical Fail Mode — Depending on construction, an internal bias spring will force the piston rod to retract or extend upon a loss of supply pressure.
Manual Override — An optional side-mounted handwheel or hydraulic hand-pump is capable of extending or retracting the actuator manually and can be engaged at any position from full open to full closed.
www.Fisher.com
Product Bulletin |
685SE and 685SR Actuators |
61.2:685SE/685SR |
|
September 2014 |
D103791X012 |
|
|
Table 1. Specifications |
|
Operating Pressure(1)
Minimum: 2.7 bar (40psig)
Maximum Allowable: 10.3 bar (150 psig)
Consult your Emerson Process Management sales office for supply pressures under 40 psig
Travel(2)
25 mm (1 inch) through 610 mm (24 inch) See table 2
Thrust Capabilities
Designed to meet the application requirements
Piston Diameter and Area(2)
Available in 51 mm (2 inch) increments between 254 mm (10 inch) and 711 mm (28 inch)
See table 2
For additional sizes, contact your Emerson Process Management sales office.
Operative Temperature Limits
Standard: 40 to 93_C (40 to 200_F)
Low Temperature: 54 to 93_C (65 to 200_F)(3) High Temperature: 32 to 204_C (25 to 400_F)(3)
Yoke Boss and Valve Stem Diameter
J 90.5 mm (3-9/16 inch) yoke boss with 19.1 mm (3/4 inch) stem J 127 mm (5 inch) yoke boss with 25.4 mm (1 inch) stem J 127 mm (5 inch) yoke boss with 31.8 mm (1-1/4 inch) stem J 127 mm (5H inch) yoke boss with 32 mm (1-1/4 inch) stem J 178 mm (7 inch) yoke boss with 51 mm (2 inch) stem
Pressure Connections
See table 3
Instrument Mounting
Mounting kits are available for use with the FIELDVUE DVC6200 series digital valve controller
Construction Materials
PART |
MATERIAL |
Yoke |
ASTM A36 (steel) |
|
|
Piston |
ASTM A36 (steel) |
|
|
Cylinder |
254 to 559 mm (10 to 22 inch) |
|
cylinder: 1026 DOM (steel) with |
|
chrome-plated bore |
|
610 to 711 mm (24 to 28 inch) |
|
cylinder: ASTM A516 Grade 70 |
|
(steel) with fluoropolymer |
|
coated bore |
|
|
Upper/Lower Heads |
ASTM A36 (steel) |
|
|
Outer Spring Cartridge |
ASTM A36 (steel) |
|
|
Tie Bolt |
ASTM A311 1045, Class B (steel) |
|
|
Piston Rod |
S31603 (316L SST) |
|
|
Stem Connector |
ASTM A36 (steel) |
|
|
Manual Override (optional)
Size 10 to 26: Handwheel
Size 28: Hydraulic Hand-pump(4)
Weights
See tables 9 and 10
Lifting Point Load Ratings
See table 11
Options
J Manual Override, J Volume Boosters,
J Fisher Optimized Digital Valve (ODV) Package
Dimensions
See figures 2 and 3 and tables 4 and 5
Certifications
J Pressure Equipment Directive (PED) 97/23/EC,
J ATEX Group II Category 2 Gas and Dust
,
J Systematic Safety Integrity, SIL 3, J GOST-R (Russia), J GOST-K (Kazakhstan)
1.The pressure/temperature limits in this bulletin and any other applicable standard or code should not be exceeded.
2.Consult your Emerson Process Management sales office for larger travels or cylinder diameters. The Fisher 657, 667, and 585C family of actuators can be used for smaller travels or cylinder diamet ers.
3.Consult your Emerson Process Management sales office for applications requiring low or high temperature requirements.
4.Consult your Emerson Process Management sales office for applications requiring a manual override on a size 28 actuator.
2
|
685SE and 685SR Actuators |
Product Bulletin |
|
|
61.2:685SE/685SR |
|
|
|
D103791X012 |
September 2014 |
|
|
|
|
|
|
Figure 1. Fisher 685SE Piston Actuator |
|
|
|
|
|
|
|
SPRING CARTRIDGE |
|
|
PRESSURE CONNECTIONS |
|
|
(TOP AND BOTTOM) |
|
TIE RODS |
SPRING |
|
CYLINDER |
|
|
PISTON |
PISTON WEAR RING |
|
PISTON QUAD SEAL |
||
MOUNTING BOSSES |
||
BEARING ASSEMBLY |
||
|
BEARING RETAINING RING |
|
|
PISTON ROD |
|
|
VALVE STEM CONNECTOR |
|
|
YOKE |
X0992
Principle of Operation
685SE and 685SR piston actuators utilize a piston that moves inside of a cylinder to generate thrust. A seal contained on the circumference of the piston provides a seal between the piston and the cylinder, preventing supply pressure leakage. A bias spring that is either below or above the piston, depending on construction, will retract or extend the piston rod upon a loss of supply pressure. This fail action will result in forcing an attached control valve to either fail-open or fail-closed.
From an equilibrium state, the actuator operates by reacting to a force unbalance that is created by increasing supply pressure on one side of the piston, and decreasing it on the other. This moves the piston up or down, and results in a repositioning of the attached control valve. Travel can be adjusted using
travel limits within a valve positioner, which limit the travel range of the actuator. The optional handwheel manual override does not have the ability to act as a hard travel stop.
An optional handwheel or hydraulic hand-pump manual override is capable of extending or retracting the actuator manually and can be engaged at any position from full open to full close. This handwheel override utilizes a worm gear assembly that is attached to the stem connector and not attached to the cylinder or piston rod. This enables the handwheel override function to reposition the control valve even if the actuator cylinder or piston is removed for maintenance. The hydraulic hand-pump override utilizes a hydraulic cylinder that is connected to the piston rod, which is controlled by a manual hand-pump.
3
Product Bulletin |
685SE and 685SR Actuators |
61.2:685SE/685SR |
|
September 2014 |
D103791X012 |
|
|
Instrument Selection
An excellent selection of sensitive and accurate instruments is available for 685SE and 685SR spring-return piston actuators. These include the FIELDVUE DVC6200 digital valve controller, as well as volume boosters.
DVC6200 Digital Valve Controller
FIELDVUE DVC6200 digital valve controllers are communicating, microprocessorbased
Table 2. Standard Constructions(1)
currenttopneumatic instruments. In addition to the traditional function of converting a current signal to a pressure signal, DVC6200 digital valve controllers, using HARTr or FOUNDATION™ fieldbus communications protocol, give easy access to information critical to process operation.
For additional information, refer to Fisher bulletin 62.1:DVC6200 (D103415X012) or 62.1:DVC6200f (D103399X012), available at www.FIELDVUE.com or from your Emerson Process Management sales office.
ACTUATOR |
PISTON |
PISTON ROD |
PISTON AREA |
VALVE STEM |
YOKE BOSS |
|
VALVE TRAVEL |
|
|
||||||
DIAMETER |
CONNECTOR SIZE |
DIAMETER |
Minimum |
Maximum |
|
||||||||||
SIZE |
|
|
|
|
|
||||||||||
|
mm |
Inch |
mm |
Inch |
cm2 |
Inch2 |
mm |
Inch |
mm |
Inch |
mm |
Inch |
mm |
Inch |
|
|
|
|
|
|
|
|
19 |
3/4 |
90 |
3-9/16 |
25 |
1 |
203 |
8 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
10 |
254 |
10 |
16 |
2.41 |
507 |
79 |
25 |
1 |
127 |
5 |
25 |
1 |
203 |
8 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
32 or 51 |
1-1/4 or 2 |
127 or 178 |
5H or 7 |
25 |
1 |
610 |
24 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
19 |
3/4 |
90 |
3-9/16 |
25 |
1 |
154 |
6 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
12 |
305 |
12 |
16 |
2.41 |
730 |
113 |
25 |
1 |
127 |
5 |
25 |
1 |
203 |
8 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
32 or 51 |
1-1/4 or 2 |
127 or 178 |
5H or 7 |
25 |
1 |
610 |
24 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
14 |
356 |
14 |
32 |
4.91 |
993 |
154 |
25 |
1 |
127 |
5 |
25 |
1 |
203 |
8 |
|
|
|
|
|
|
|
|
|
|
|||||||
32 or 51 |
1-1/4 or 2 |
127 or 178 |
5H or 7 |
25 |
1 |
610 |
24 |
|
|||||||
|
|
|
|
|
|
|
|
||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
16 |
406 |
16 |
32 |
4.91 |
1297 |
201 |
25 |
1 |
127 |
5 |
25 |
1 |
203 |
8 |
|
|
|
|
|
|
|
|
|
|
|||||||
32 or 51 |
1-1/4 or 2 |
127 or 178 |
5H or 7 |
25 |
1 |
610 |
24 |
|
|||||||
|
|
|
|
|
|
|
|
||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
18 |
457 |
18 |
32 |
4.91 |
1642 |
254 |
25 |
1 |
127 |
5 |
25 |
1 |
203 |
8 |
|
|
|
|
|
|
|
|
|
|
|||||||
32 or 51 |
1-1/4 or 2 |
127 or 178 |
5H or 7 |
25 |
1 |
610 |
24 |
|
|||||||
|
|
|
|
|
|
|
|
||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
20 |
508 |
20 |
46 |
7.07 |
2027 |
314 |
25 |
1 |
127 |
5 |
25 |
1 |
203 |
8 |
|
|
|
|
|
|
|
|
|
|
|||||||
32 or 51 |
1-1/4 or 2 |
127 or 178 |
5H or 7 |
25 |
1 |
610 |
24 |
|
|||||||
|
|
|
|
|
|
|
|
||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
22 |
559 |
22 |
46 |
7.07 |
2452 |
380 |
25 |
1 |
127 |
5 |
25 |
1 |
203 |
8 |
|
|
|
|
|
|
|
|
|
|
|||||||
32 or 51 |
1-1/4 or 2 |
127 or 178 |
5H or 7 |
25 |
1 |
610 |
24 |
|
|||||||
|
|
|
|
|
|
|
|
||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
24 |
610 |
24 |
62 |
9.62 |
2919 |
452 |
25 |
1 |
127 |
5 |
25 |
1 |
203 |
8 |
|
|
|
|
|
|
|
|
|
|
|||||||
32 or 51 |
1-1/4 or 2 |
127 or 178 |
5H or 7 |
25 |
1 |
610 |
24 |
|
|||||||
|
|
|
|
|
|
|
|
||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
26 |
660 |
26 |
62 |
9.62 |
3425 |
531 |
25 |
1 |
127 |
5 |
25 |
1 |
203 |
8 |
|
|
|
|
|
|
|
|
|
|
|||||||
32 or 51 |
1-1/4 or 2 |
127 or 178 |
5H or 7 |
25 |
1 |
610 |
24 |
|
|||||||
|
|
|
|
|
|
|
|
||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
28 |
711 |
28 |
62 |
9.62 |
3973 |
616 |
25 |
1 |
127 |
5 |
25 |
1 |
203 |
8 |
|
|
|
|
|
|
|
|
|
|
|||||||
32 or 51 |
1-1/4 or 2 |
127 or 178 |
5H or 7 |
25 |
1 |
610 |
24 |
|
|||||||
|
|
|
|
|
|
|
|
||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
1. Consult your Emerson Process Management sales office for additional sizes.
4
Loading...