UBUHANZI
UBWIZA N'UBUZIMA
UBUKORIKORI
UMUCO N'AMATEKA
IMYIDAGADURO
IBIDUKIKIJE
IBIRIBWA N'IBINYOBWA
UBWUBATSI BUSUBIRA INYUMA
UBUMENYI
SIPORO
IKORANABUHANGA
IBYAMBARWA
Bourdon-Tube Pressure Gauge
The heart of a dial pressure gauge is the Bourdon tube: a metal tube of oval section bent into a C and sealed at its free end. The greater the pressure, the farther the free tip moves, but only about 0.125–0.25 in (3–6 mm) across the whole range. A geared movement, built much like clockwork, turns that small movement into the sweep of a pointer, usually over 270° of dial. The tube metal must take a spring temper; phosphor bronze is used for most gauges for air, light oil or water, and beryllium copper for high pressure. The tube's wall thickness and the radius of its curve set the pressure range.
Hejuru
Factory process
Amabwiriza
1
1
Roll the C
Roll the C
Pass the tubing over a lubricated steel mandrel and between two grooved, powered rollers. One roller grips the end and bends the inside radius while the other presses from outside; the grooves keep the tube from flattening.
Ibikoresho by'iyi ntambwe:
Itiyo y'umuringa wa fosifore1 as requiredIbikoresho bikenewe:
Imashini igonda amatiyo ya Bourdon2
2
Cut and heat treat
Cut and heat treat
As the roller keeps turning, a saw blade on it cuts the tube to length. Heat treat the tubes in ovens to give them their spring temper.
Ibikoresho bikenewe:
Itanura ryo gutunganya hakoreshejwe ubushyuhe3
3
Machine the socket
Machine the socket
Turn, drill, mill and thread the socket from bar stock in one cycle on a machining centre. One end is threaded to screw into the pressure source.
Ibikoresho by'iyi ntambwe:
Umurongo Uzengurutse w'Umuringa w'Umuhondo1 as requiredIbikoresho bikenewe:
Ikigo cy'imashini za CNC4
4
Join tube and socket
Join tube and socket
Solder, braze or weld the open end of the tube to the socket, locating the free end precisely, and seal the free end the same way. Fit an endpiece to the tip; its small hole links the tip to the movement.
Ibikoresho bikenewe:
Itara ryo gusudira ku bushyuhe bwinshi5
5
Fit movement, dial and pointer
Fit movement, dial and pointer
Mount the movement, the dial and the pointer onto the socket as a group.
Ibikoresho by'iyi ntambwe:
Ubuhanga bw'igipimo cy'umuvuduko1 igice
Isura n'urushinge by'igipimo1 igice6
6
Calibrate and case
Calibrate and case
Connect the assembly to a pressure source alongside a master gauge of known accuracy and adjust it until it reads the same; 2% is a common accuracy, finer grades 1, 0.5 or 0.25%. Then fit the case and lens.
Ibikoresho by'iyi ntambwe:
Agasanduku n'ikirahure by'igipimo1 igiceIbikoresho bikenewe:
Ameza yo kugenzura ibipimo afite igipimo nyamukuruIbikoresho
5- 1 as requiredUmwanya
- 1 as requiredUmwanya
- Umwanya
- 1 igiceUmwanya
- Umwanya
Ibikoresho bikenewe
5- Umwanya
Iki gishushanyo gikora
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Izi blueprint zisangira ubumenyi — uburyo, ibikoresho cyangwa amahame
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