Overview of Primary Product
Table Of Contents
- Application
- Features
- Applicable Literature
- SPECIFICATIONS
- INSTALLATION
- Mounting
- ADJUSTMENTS
- MAINTENANCE
- MAINTENANCE PARTS
- Figure-2 MK-46xx Maintenance Parts.
- 1. Disconnect air line to actuator.
- 1. Disconnect air line to actuator.
- 2. Rotate start point adjustment counterclockwise (as viewed from the bottom) to remove as much spring compression as possible.
- 3. Remove the four cover mounting screws, the top cover, and the diaphragm.
- 4. While holding down the piston with the heel of your hand, remove the connecting pin.
- 5. Slowly release pressure on piston and remove piston.
- 6. Remove spring and insert replacement.
- 7. Position piston over spring, making sure position indicator is aligned with guide.
- 8. Pushing down on piston, align holes in valve stem extension and piston shaft and insert connecting pin.
- 9. Position diaphragm and top cover on actuator and even secure with the four screws.
- 10. Refer to "ADJUSTMENTS" on page 4 and adjust start point of actuator to desired value.
- MK-46xx Series
- MK4-46xx Series
- MK-46xx Series
- MAINTENANCE PARTS
2 © Copyright 2006 TAC All Rights Reserved. F-13894-7
SPECIFICATIONS
Construction:
Housing, Die cast aluminum.
Diaphragm, Replaceable beaded molded neoprene.
Stroke: (Table-1).
Effective Area: 11 sq. in. (71 cm
2
).
Spring: Retracts actuator shaft and raises valve stem on loss of air pressure.
Nominal Spring Range: (Table-1).
Start Point:
MK-4601, MK-4621:Adjustable +1/-2 psi (+7/-14 kPa).
MK-4611, MK-4641: ±2 psig (±14 kPa)
MK-4621-422: 10 psig (69 kPa)
Maximum Air Pressure: 30 psig (207 kPa).
Ambient Temperature Limits:
Shipping, -40 to 220 °F (-40 to 104 °C).
Operating, -20 to 220 °F (-29 to 104 °C).
Air Connections: 1/8 in. FNPT.
Valve Linkage: AV-401 (order separately).
Locations: NEMA Type 1 only.
Mounting: In any upright position with actuator head above horizontal center line of valve
body.
Dimensions: 3-7/8" H x 4-3/4" W x 4-3/4" D in. (99 x 121 x 121 mm).
ACCESSORIES
AK-42309-500 Positive positioner and linkage
TOOL-85 Manual hand pump bulb (included in TOOL-95-1)
TOOL-95-1 Pneumatic calibration tool kit
Table-1 Model Chart.
Model Number
Nominal Spring Range Nominal
Stroke
a
in. (mm)
a
Nominal (no load) spring range based on 1/2" (13 mm) nominal stroke.
Valve
Linkage
Valve Compatibility
psig kPa
MK-4601
MK4-4601
b
b
Includes factory AK-42309-500 installed positive positioner. Start point adjustable 1 to 12 psig (7 to 83 kPa). Span
adjustable 2 to 13 psi (14 to 90 kPa).
3 to 8 21 to 55
1/2 (13) AV-401
1/2" to 1-1/4" VB-7xxx
1/2" to 1-1/4" VB-9xxx
c
1/2" to 1-1/4" VB-111
c
5/8" or 7/8" OD VB-131
c
1/2" to 1-1/4" VB-151
c
c
Discontinued.
MK-4611
MK4-4611b
5 to 10 34 to 69
MK-4621
MK4-4621b
8 to 13 55 to 90
MK-4621-422
d
d
For sequencing applications, see VB-7332 General Instructions, F-24396.
10 to 11.25 69 to 77
MK-4641 3 to 13 21 to 90