Schneider Electric MK-6600 Series, MK-6800 Series, MK-6911 Data Sheet

Application

Typical of MK-6600 Series

and MK-6800 Series

MK-6911

These valve actuators, with a 50 sq. in. (323 cm2) effective diaphragm area, are used for propo rt ion al pneumatic control of hot water or chilled water valves.

• MK-66x1 is used to control 1-1/2 in. to 2 in. VB-7xxx

series valves.

• MK-68x1 is used to control 2-1/2 in. to 4 in.

VB-9xxx series valves

• MK-681 1 is used to control 2- 1/2 in. to 5 in .VB-8xx3

series valves and 2-1/2 in. to 4 in. VB-9xxx series valves

MK-6600 Series,

MK-6800 Series, and MK-6911

Pneumatic Valve Actuators

General Instructions

• MK-6911 is used to control 6 in. VB-8xxx valves

Features

• Rugged die cast aluminum housing.

• Replaceable beaded molded neoprene diaphragm.

• Built-in spring to retract output shaft.

• Adjustable start point on loss of air pressure.

Applicable Literature

• Pneumatic Products Catalog, F-27383

• Cross-Reference Guide, F-26789

• Reference Manual, F-21683

• Application Manual, F-21335

• AV-430 Linkage General Instructions, F-19072

• AV-495 Linkage General Instructions, F-21665

• AV-497 Linkage General Instructions, F-27253

SPECIFICATIONS

Construction:

Housing, Die cast aluminum.

Diaphragm, Replaceable beaded molded neoprene. Stroke: (Table-1). Effective Area: 50 sq. in. (323 cm2). Spring: Retracts actuator shaft and raises valve stem on loss of air pressure. Nominal Spring Range: (Table-1). Start Point: Adjustable ±2 psi (14 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: Order separately (Table-2). Locations: NEMA Type 1 only. Mounting: In any upright position with actuator head above center line of valve body. Dimensions: 7-3/4 H x 10-1/2 W x 10-1/2 D in. (199 x 267 x 267 mm).

Table-1 Model Chart.

Model Number

MK-6601 3 to 8 21 to 55

MK-6621 8 to 13 55 to 90 — MK-6801 3 to 8 21 to 55 MK-6811 5 to 10 34 to 69 2-1/2" to 5" MK-6821 8 to 13 55 to 90 — MK-6911 5 to 10 34 to 69 1-3/4 (44) — 6" —

*Nominal no load spring range based on normal stroke

Nominal Spring Range*

psig kPa VB-7xxx VB-8xxx VB-9xxx

Nominal Stroke

in. (mm.)

1-1/2" to 2"

1/2 (13)

1 (25) —

Valve Compatibility

(40 to 50

mm)

—

2-1/2" to 4"

(65 to 80

mm)

Table-2 Valve Linkage.

Valve Linkage Valve Body Series

AV-430 VB-7xxx 1-1/2 in. to 2 in. (40 to 50 mm) AV-495 VB-9xxx 2-1/2 in. to 4 in. (65 to 80 mm) AV-497 VB-8xxx 2-1/2 in. to 6 in.

—MK-6611 5 to 10 34 to 69 —

ACCESSORIES

AK-42309-500 Positive positioner and linkage TOOL-75 Spring compression tool TOOL-95 Pneumatic calibration tool kit

MK-6600 Series

PNV-245-013 3 to 8 psig green spring PNV-245-015 5 to 10 psig black spring PNV-245-018 8 to 13 psig blue spring

MK-6700 and MK-6800 Series

PNV-245-103 3 to 8 psig green spring PNV-245-105 5 to 10 psig black spring PNV-245-108 8 to 13 psig blue spring

MK-6900 Series

PNV-245-145 5 to 10 psig black spring PNV-245-148 8 to 13 psig blue spring

All Series

PNV-202 Diaphragm

INSTALLATION



C A U T I O N

Spring Retainer Plate

Brass Hex Nut for adjusting start point

Bracket Nut

Actuator to Yoke Mounting Bolts (2)

Mounting Bracket

Inspection

Requirements

Mounting

Inspect the package for damage. If damaged, notify the appropriate carrier immediately. If undamaged, open the package and inspect the device for obvious damage. Return damaged products.

• Piping diagrams.

• Tools (not provided): Appropriate wrenches for mounting bolts and adjustments.

• Training: Installer must be a qualified, experienced technician or fitter.

• Make all connections in accordance with the piping diagram.

• Avoid locations where excessive moisture, corrosive fumes, or vibration are present.

• The actuator can be mounted in any position above the centerline of the valve body.

When selecting a location, allow sufficient room for accessories and for service of the product.

The actuator may be shipped assembled to a valve body or as a separate component. These instructions are intended for use where the actuator is to be installed to a linkage and valve body, as a replacement unit, or when the actuator must be removed during valve installation.

Figure-1 Typical Pneumatic Valve Assembly with MK-6xxx Series Actuator.

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