Schneider Electric MK-2690 Catalog Page

MK-2690

Pneumatic Valve Actuator

For proportional pneumatic control of 1/2 in. to 2 in. VB-7xxx Series valves (subject to close-off ratings) and discontinued 1/2 in. to 1-1/4 in. VB-9xxx valves.

Features:

• Compact size with 6 in.

• Rugged die cast aluminum housing.

• Replaceable beaded molded neoprene diaphragm.

Model Chart

Model No.

MK-2690

Nominal (no load) condition, spring ranges based on 1/ 2 in. (13 mm) maximum stroke, provided by AV-7400 or AV-400 linkage (order separately).

Specifications

Inputs Compatible with Proportional pneumatic signal. Refer to Model Chart.

Start point Non-adjustable.

Air connections 1/8 in. FNPT located on side of housing.

Mechanical Outputs

Stroke 1/2 in. (12.6 mm) nominal.

Environment

Ambient temperature limits

Humidity 5 to 95% RH, non-condensing.

Maximum air pressure 30 psig (207 kPa).

Spring

Dimensions 3-9/16 H x 5 W x 2-1/4 D in. (90 x 127 x 57 mm).

(39 cm2) effective area.

Shipping: -40 to 220°F (-40 to 104°C). Operating: -20 to 220°F (-29 to 104°C).

Stainless steel spring retracts actuator shaft and raises valve stem on loss of air pressure. Springs provided in AV-400 or AV-7400 linkage (order separately).

Nominal Spring Range

psig kPa

3 to 7 (Yellow) 21 to 48

5 to 10 (Black) 34 to 69

8 to 13 (Blue) 55 to 90

(Spring Color Code)

Accessories

Model No. Description

AK-42309-500 Positive positioner and linkage. AV-400 Valve linkage (includes parts for VB-7xxx and discontinued 1/2 to 1-1/4 in. VB-9xxx valves). AV-7400 Valve linkage for VB-7xxx valves only. TOOL-095-1 Pneumatic calibration tool kit.

Maintenance Parts

PNV-144-043 Yellow 3 to 7 psig spring. PNV-145-045 Black 5 to 10 psig spring. PNV-145-048 Blue 8 to 13 psig spring. PNV-102-1 Diaphragm. PNV-103-3 Lower housing.