GEK Wiki / Servo Valve Assembly
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Servo Valve Assembly

Page history last edited by jim mason 13 years, 8 months ago

Here's a method for making DIY servo driven butterfly valves for syngas/air mixing, or other gas flow control needs.  The industrial versions of these are usually terribly expensive.  Here's a way to make them much less so.  This method uses a heavy duty RC servo and common plumbing butterfly valves.  You can use the method to make nearly any size servo driven butterfly valve.  The files and steps below relate to a 1" valve.  The valves are available via McMaster Carr here: http://www.mcmaster.com/#9798k35/=88ksru

 

 

      

Servo valve installed on a Power Pallet (July 2010)

 

1. Armature

CNC plasma or laser cut armature mounting plate (file: ServoValve3.dxf).

Brake armature as indicated and tack weld corners.

Assure snug fit of valve inside bent tabs.

Paint armature.

 

 

2. Servo Lovejoy

Attach double servo-arm included with servo to the first shaft couplers by carefully tapping and installing 2 4-40 machine screws. If done manually, a centering jig can be made with a 3/16" round standoff and 6-32 nut through the servo-arm. Shorten arms by cutting and sanding.

 

3. Valve Lovejoy

Remove packing from valve. Tap the second flex-coupler to 1/4"-20. Install jam nut at the base of the valve stem. Screw on flex-coupler and tighten set screw. Back jam nut against flex-coupler. We also apply a small amount of Loctite to ensure the parts remain tight.

3. Enclosure

Use a hole saw to drill a hole for the 1" barb. Hole is centered at 1.5" over (centered between) and 1.25" up from bottom holes in enclosure.

4. Assembly

Fit valve into armature and use a zip-tie around the valve and bottom of the armature to hold valve in place.

Slide servo into the armature and install spider between valve and servo.

Install armature into enclosure using two 1/4"-20 bolts and nuts. Screw the conduit locknut on the barb and screw the barb into the valve from the back of the enclosure, tighten the lock nut down while holding the valve from the opposite side.

 

The resulting valve can be mounted in an enclosure if desired.  We usually put them in standard NEMA boxes, like below.

 

 

 

 

Bill of Materials

Part Description # per unit Vendor Part #
Servo Valve Armature - 1/16" steel  1 In-house
ServoValve3.dxf 
Shaft Coupler - Flexible Spider Shaft Coupling Hub 3/16" Bore, 5/8" OD
2 McMaster 6408K912
Buna-N Spider 1 McMaster 6408K61
Jam Nut - 1/4-20 1 McMaster  
Butterfly Valve 1" 1 McMaster 9798K35
NEMA 3R Enclosure 8x6x4 1 McMaster 7649K38
1" barb 1 McMaster 5363K43
1" hose clamps 1 McMaster 5416K14
1" conduit nuts 1 McMaster 7513K243
Servo HS-755HB 1 Servo City 33755S
Servo Extension 1 Servo City SE2248S

 

 

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