UBUCIKO
UBUHLE NEMPILO
UBUCIKO BEZANDLA
AMASIKO NOMLANDO
EZOKUZIJABULISA
IMVELO
UKUDLA NEZIPHUZO
REVERSE ENGINEERING
IZAYENSI
EZEMIDLALO
UBUCHWEPHESHE
IZINTO EZIGQOKWAYO
Brass Ball Check Valve: a Steel Ball on a Lapped Conical Seat
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18. uMfumfu 2026NO
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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.
Ophakathi
Half a day

Imiyalelo

1

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.

Izinto zokwakha zalesi sinyathelo:

Ubhamu LwethusiUbhamu Lwethusi1 ucezu

Amathuluzi adingekayo:

Umshini Wokuphendula InsimbiUmshini Wokuphendula Insimbi
Isibambi somshini wokuphenda esinemilomo emithathuIsibambi somshini wokuphenda esinemilomo emithathu
Ithuluzi lokusika le-latheIthuluzi lokusika le-lathe
Iqoqo Lamakhanda EbholaIqoqo Lamakhanda Ebhola
Isethi Yamabhithi E-CountersinkIsethi Yamabhithi E-Countersink
Uwoyela wokusikaUwoyela wokusika
I-Caliper Yedijithali Yamayintshi Ayi-6I-Caliper Yedijithali Yamayintshi Ayi-6
Izibuko zokuphephaIzibuko zokuphepha
2

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.

Amathuluzi adingekayo:

Ingxube yokuphululaIngxube yokuphulula
Isibambo SebhentshiIsibambo Sebhentshi
3

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.

Izinto zokwakha zalesi sinyathelo:

Izixhumanisi zethusiIzixhumanisi zethusi2 izicucu
I-bearing yamabhola ensimbiI-bearing yamabhola ensimbi1 ucezu
Iqoqo lezintambo zokucindezelaIqoqo lezintambo zokucindezela1 ucezu

Amathuluzi adingekayo:

Isibambo SebhentshiIsibambo Sebhentshi
Isando esinekhanda elimise okwesikhonkwaneIsando esinekhanda elimise okwesikhonkwane
Isipanela esilungisekayoIsipanela esilungisekayo
4

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.

Amathuluzi adingekayo:

Isipanela esilungisekayoIsipanela esilungisekayo

Izinto

4

Amathuluzi Adingekayo

12

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Brass Fittings: Sand-Cast on a Core, Then Tapped

Brass Fittings: Sand-Cast on a Core, Then Tapped

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Bearing Steel Tube (52100): Drilled and Bored from Bar on the Lathe

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