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.

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

Nominal (no load) spring range based on 1/2" (13 mm) nominal stroke.

Discontinued.

For sequencing applications, see VB-7332 General Instructions, F-24396.

Nominal Spring Range Nominal

psig kPa

10 to 11.25 69 to 77

Stroke in. (mm)

1/2 (13) AV-401

Valve

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

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