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Brass Ball Check Valve: a Steel Ball on a Lapped Conical Seat
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18. Oktoba 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.
Kati
Half a day

Maagizo

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.

Vifaa kwa hatua hii:

Ufito wa shaba ya njanoUfito wa shaba ya njano1 kipande

Zana zinazohitajika:

Kereza ya ChumaKereza ya Chuma
Chaki ya kereza yenye makucha 3Chaki ya kereza yenye makucha 3
Chombo cha kukata cha latheChombo cha kukata cha lathe
Seti ya vichimbuziSeti ya vichimbuzi
Seti ya vitobo vya kuzamisha vichwa vya skrubuSeti ya vitobo vya kuzamisha vichwa vya skrubu
Mafuta ya kukatiaMafuta ya kukatia
Kipima-unene cha dijitali cha inchi 6Kipima-unene cha dijitali cha inchi 6
Miwani ya usalamaMiwani ya usalama
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.

Zana zinazohitajika:

Mchanganyiko wa kulainishaMchanganyiko wa kulainisha
Kibano cha meza ya kaziKibano cha meza ya kazi
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.

Vifaa kwa hatua hii:

Viungio vya shaba-njanoViungio vya shaba-njano2 vipande
Bearing ya tufe za chumaBearing ya tufe za chuma1 kipande
Mkusanyo wa spring za mgandamizoMkusanyo wa spring za mgandamizo1 kipande

Zana zinazohitajika:

Kibano cha meza ya kaziKibano cha meza ya kazi
Nyundo yenye kichwa cha msalabaNyundo yenye kichwa cha msalaba
Spana inayoweza kurekebishwaSpana inayoweza kurekebishwa
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.

Zana zinazohitajika:

Spana inayoweza kurekebishwaSpana inayoweza kurekebishwa

Vifaa

4

Zana Zinazohitajika

12

Mchoro huu unatengeneza

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Blueprint zinazohusiana

Blueprint hizi zinashiriki maarifa — mbinu, vifaa au kanuni

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