အသုံးပြုမှုအလိုက် ပိုက်နှင့် ခေါင်း ရွေးချယ်ခြင်း
Thread standard follows where the machine was built more than what it does. Knowing what a customer drives usually tells you which shelf to walk to before a caliper comes out. This is the map from machine to fitting family, and the questions that settle the hose grade.
သံချည်စံနှုန်းသည် စက်ကို ဘယ်နိုင်ငံမှာ ထုတ်သလဲဆိုသည်အပေါ် အများဆုံး မူတည်ပါသည်။ ဖောက်သည်၏ စက်ကို သိပါက မည်သည့်စင်သို့ သွားရမည် ခန့်မှန်းနိုင်ပါသည်။
Machine origin to fitting family
စက်မူလအရင်းအမြစ်မှ ခေါင်းအမျိုးအစားသို့
| Machine | Expect | Families | Why |
|---|---|---|---|
| Japanese trucks — Isuzu, Hino, Mitsubishi, Nissan Diesel | JIS British 60° | 296 | BSPP threads with a Japanese seat. Very common in this market |
| Komatsu excavators, loaders, dozers | JIS Metric 60° | 286, 186, 881 | Metric thread, 30° per face. Fits nothing else — keep it separate on the shelf |
| European machinery, cranes, agricultural implements | Metric 24° cone, L and S | 204, 205, 304, 305 | DIN 2353 ports. L for medium pressure, S for high |
| American machinery, tractors, skid steers | JIC 74° | 267, 167 | Metal-to-metal cone, no O-ring to lose |
| Construction plant, high vibration | ORFS flat face | 242, 342 | Best leak resistance under vibration |
| General workshop, tippers, tractors, local fabrication | BSPP 60° cone | 226, 222, 227, 221 | The default in this market. Widest stock, easiest to source |
| Pump and motor ports, 1/2 inch and up | SAE four-bolt flange | 873, 876, 879 | The only practical way to seal large bore at high pressure |
| Fuel, brake, clutch, low-pressure return | Banjo | 700, 102, 104, 105, 108 | Turns the line through 90° in almost no space |
ဂျပန်ကား — 296 · Komatsu — 286 · ဥရောပစက် — 304/305 · အမေရိကန်စက် — 267 · တုန်ခါမှုများသော နေရာ — 242/342 · ယေဘုယျ — 226
Choosing the hose grade
ပိုက်အဆင့် ရွေးချယ်ခြင်း
| Circuit | Grade | Reasoning |
|---|---|---|
| Return lines, tank lines, low-pressure feed | R1 — EN 853 1SN | One wire braid is enough where pressure is low and steady |
| Working pressure on most implements — tipper rams, loader arms, steering assist | R2 — EN 853 2SN | The everyday choice. Most replacements on a machine are R2 |
| Main pressure on excavators and heavy plant, circuits that shock | R4 — EN 856 4SH | Four spiral layers for high pressure and hard pulsing |
The questions that settle it
ဆုံးဖြတ်ပေးသော မေးခွန်းများ
| Ask | What it decides |
|---|---|
| What machine, and what does this circuit do? | Thread family and the likely grade |
| What pressure does it run at, and does it shock? | Grade. Surges do not show on an ordinary gauge — a circuit that hammers needs more than the steady figure suggests |
| Is it suction or pressure? | A pump inlet sees negative pressure and collapses an ordinary pressure hose |
| How hot does it get — fluid and surroundings? | Whether the route needs moving or sleeving, and whether the grade is adequate |
| What fluid? | Compatibility of tube, cover, reinforcement and fittings |
| Where does it run? | Abrasion, vibration, UV and ozone exposure — and whether it needs clamping or sleeving |
| How much movement is there? | Length, slack, bend radius, and whether the route bends in more than one plane |
Bore — big enough, not bigger
အတွင်းအချင်း — လုံလောက်ရုံ
Undersized hose costs pressure and generates heat from fluid velocity; the machine feels slow and the oil runs hot. Oversized hose costs money, takes space and is harder to route. Match the bore that came off unless there is a reason to change it, and if the customer wants a change, establish the flow first.
ပိုက် သေးလွန်းပါက ဖိအားကျပြီး ဆီပူပါသည်။ ကြီးလွန်းပါက ကုန်ကျစရိတ် မြင့်ပြီး လမ်းကြောင်း ချရခက်ပါသည်။
Typical builds
ပုံမှန် တပ်ဆင်မှု နမူနာများ
| Job | Build |
|---|---|
| Tipper ram on a local truck | R2 hose · BSPP female 60° both ends · 226 family · straight one end, 90° at the ram |
| Komatsu excavator boom line | R4 hose · Komatsu metric 60° · 286 family · flange at the pump end if 1/2 inch or larger |
| European loader implement circuit | R2 hose · metric 24° cone · 304 or 305 depending on pressure series |
| Japanese truck power steering | R1 or R2 · JIS British 60° · 296 family |
| Fuel or brake line | Banjo ends · 700 or 10x families · low pressure |
| Pump outlet, 1 inch | R4 hose · SAE flange · 873 for 3,000 psi or 876 for 6,000 psi — confirm which the pump port is |
Before the job leaves the bench
ဘင်ချ်မှ မထွက်မီ
Both ends decoded and written as full specifications
Hose grade stated and matched to the ferrule wire count
Length measured to the sealing face, elbow ends to the centreline
Orientation of the two ends recorded
Assembly blown through and both ends capped
Part numbers written on the job card with the machine make and model
နှစ်ဖက်စလုံး Specification · ပိုက်အဆင့်နှင့် သံကာ ကိုက်ညီမှု · အရှည်နှင့် ထောင့် · လေမှုတ်၍ အဖုံးတပ် · မှတ်တမ်း
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