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Brass Ball Check Valve: a Steel Ball on a Lapped Conical Seat
A check valve lets water or air through one way only. In a ball check valve a ball closes on a conical seat, pushed there by reverse flow or by a light spring (Wikipedia, Check valve). This one is built from two brass fittings, a seat turned from brass rod, a steel ball and a spring. The build is ours.
The picture: our drawing.
Intermediate
Half a day
Instructions
1
1
Turn the seat
Turn the seat
Turn a short plug of brass rod to a press fit in the bore of the first fitting. Drill it through, a little smaller than the ball, and countersink the outlet end to a cone that the ball sits in.
Materials for this step:
Brass Rod1 pieceTools needed:
Metal Lathe
Lathe Chuck 3-Jaw
Lathe Cutting Tool
Drill Bit Set
Countersink Bit Set
Cutting Oil
Digital Caliper 6-Inch
Safety Glasses2
2
Lap the seat
Lap the seat
Put a trace of lapping compound in the cone, set the ball in it and turn it round under light pressure until the seat shows a bright, unbroken ring. Clean off every trace of compound.
Tools needed:
Lapping Compound
Bench Vise3
3
Assemble
Assemble
Press the seat into the first fitting with the cone facing downstream. Drop in the ball, then a light spring that just holds it on the seat, and screw on the second fitting so its end keeps the spring in place.
Materials for this step:
Brass Fittings2 pieces
Steel Ball Bearing1 piece
Compression Spring Assortment1 pieceTools needed:
Bench Vise
Cross Peen Hammer
Adjustable Spanner4
4
Test it
Test it
Blow through the inlet: air should pass with a light push. Blow into the outlet: nothing should pass. Mark the flow direction on the body.
Tools needed:
Adjustable SpannerMaterials
4- 1 piecePlaceholder
- 2 piecesPlaceholder
- 1 piecePlaceholder
- Placeholder
Tools Required
12- Placeholder
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