Schneider Electric MK-46xx Series Installation Instructions
Application
These valve actuators, with an 11 sq. in. (71 cm2) effective
diaphragm area, are used with VB-7xxx series valves for
proportional pneumatic control of hot water or chilled water
valves.
The MK-46xx Series may also be mounted on discontinued
1/2" through 1-1/4" TAC
VB-111, VB-131, VB-314, and VB-9xxx series valves.
MK-46xx Series
Pneumatic Valve Actuators
General Instructions
SPECIFICATIONS
Construction:
Housing, Die cast alum
Diaphragm, Replaceable beaded molded
neoprene.
Stroke: (Table-1).
Effective Area: 11 sq. in. (71 cm
Spring: Retracts actuator shaft and raises valve stem
on loss of air pressure.
Nominal Spring Range: (Table-1).
Start Point:
MK-4601, MK-4621:Adju
(+7/-14 kPa).
MK-4611, MK-4641: ±2 psig (±14 kPa)
MK-4621-422: 10 psi
Maximum Air Pressure: 30 psig (207 kPa).
Ambient Temperature Limits:
Shipping, -40 to 220 °F (-40 to
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
ve horizontal center line of valve body.
abo
Dimensions: 3-7/8" H x 4-3/4" W x 4-3/4" D in. (99 x
121 x 121 mm).
inum.
2
).
stable +1/-2
g (69 kPa)
psi
104 °C).
MK-46xx Series
Features
• Rugged die cast aluminum housing
• Replaceable beaded molded neoprene diaphragm
• Built-in spring to retract output shaft on loss of air pressure
• Adjustable start point
• Multiple spring ranges for various applications
• 1/2" nominal stroke
Applicable Literature
• Valve Products Catalog, F-27384
• Cross-Reference Guide, F-23638
• Reference Manual, F-21683
• Application Manual, F-21335
• AK-42309-500 Positive Positioner Pneumatic Relay
General Instructions, F-22909
• AV-401 Linkage General Instructions, F-25586
ACCESSORIES
AK-42309-500 Positive positioner and linkage
TOOL-85 Manual hand pump bu b (included in TOOL-95-1)
TOOL-95-1 Pneumatic calibration tool kit
Table-1 Model Chart.
Model Number
MK-4601 3 to 8 21 to 55
MK-4611 5 to 10 34 to 69
MK-4621 8 to 13 55 to 90
MK-4621-422
MK-4641 3 to 13 21 to 90
a
Nominal (no load) spring range based on 1/2" (13 mm) nominal stroke.
b
Discontinued.
c
For sequencing applications, see VB-7332 General Instructions, F-24396.
Printed in U.S.A. 1/10 © Copyright 2010 Schneider Electric All Rights Reserved. F-13894-10
Nominal Spring Range Nominal
psig kPa
c
10 to 11.25 69 to 77
Stroke
in. (mm)
1/2 (13) AV-401
Valve
a
Linkage
Valve Compatibility
1/2" to 1-1/4" VB-7xxx
1/2" to 1-1/4" VB-9xxx
1/2" to 1-1/4" VB-111
5/8" or 7/8" OD VB-131
1/2" to 1-1/4" VB-151
b
b
b
b
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