Schneider Electric MK-6601 Catalog Page

Valve Actuators, Proportional

MK-6xxx Series

Proportional pneumatic actuator with 50 sq. in. (323 cm

) effective diaphragm area used to control 1-1/2 in. to 2 in. VB-7xxx series, 2-1/2 in. to 6 in. VB-8xxx series, 2-1/2 in. to 6 in. VB-9xxx series,

Features:

• Rugged die cast aluminum construction.

• Rolling diaphragm.

• Three spring ranges for various applications.

• Start point adjustable ±2 psi.

MK-68x1

MK-66x1

Model Chart

Model No.

MK-6601 3 to 8 21 to 55 1/2 (13.7)

MK-6611 5 to 10 34 to 69 1/2 (13.7)

MK-6621 8 to 13 55 to 90 1/2 (13.7)

MK-6801 3 to 8 21 to 55

MK-6821 8 to 13 55 to 90

MK-6911

MK-6921

Nominal (no load) spring ranges based on maximum 1/2 in. (13.7 m m), 1 in. (25.4 mm) or 1-1/2 in. (33.1 mm) stroke for MK-6911. MK-6911 is only used on 6 in. VB-8xx3-0-5-16. MK-6911 and MK-6921 were used on discontinued 4 to 6 in. VB-9323-0-5-x. Recommended for field replacements only where 20 psi air supply pressure is not available and/or required close-off pressure is less than 125 psi.

5 to 10 34 to 69 1-1/2 (33.1)

8 to 13 55 to 90 1-1/2 (33.1)

Nominal Spring Range

psig kPa

Nominal Stroke in. (mm)

MK-6911

MK-6921

1 (25.4)MK-6811 5 to 10 34 to 69

Specifications

Construction

Housing Die cast aluminum.

Diaphragm Replaceable beaded molded neoprene (Part number PNV-202). Stroke Refer to Model Chart. Spring Retracts actuator shaft and raises valve stem on loss of air pressure. Nominal spring range Refer to Model Chart. Starting point Adjustable ±2 psig (±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 Refer to Accessories (order separately). Mounting In any upright position with actuator head above the center line of the valve body. Dimensions 7-3/4 H x 10-1/2 W x 10-1/2 D in. (199 x 267 x 267 mm).

MK-6xxx Series

Accessories

Part Number Description

AK-42309-500 Positive positioner and linkage. TOOL-095-1 Pneumatic calibration tool kit.

Linkage Valve Body Series

AV-430 VB-7xx3, 1-1/2 to 2 in.

AV-495 VB-9213, 2-1/2 to 4 in. (discontinued).

AV-497 VB-8213, 2-1/2 to 6 in.

Maintenance Parts

PNV-202 Diaphragm. PNV-245-013 Green, 3 to 8 psi spring. PNV-245-015 Gray or black, 5 to 10 psi spring. PNV-245-018 Blue, 8 to 13 psi spring.

VB-7xx4, 1-1/2 to 2 in. VB-9323, 2-1/2 to 6 in. (discontinued).

VB-9223, 2-1/2 to 4 in. (discontinued). VB-9313, 2-1/2 to 4 in.

VB-8223, 2-1/2 to 6 in. VB-8303, 2-1/2 to 6 in.