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ON/OFF vs. Modulating – Choose First
| Feature | ON/OFF (Isolation) | Modulating (Regulating) |
|---|---|---|
| Function | Fully open or closed | Any position 0–100% |
| Signal | Dry contact, 24V/110V/220V AC | 4–20 mA, 0–10V, Modbus |
| Feedback | Limit switches (open/closed) | Analog transmitter (4–20 mA) |
| Duty cycle | Intermittent (S2, <30%) | Continuous (S4/S5 rated) |
| Application | Tank fill, pump isolation | Flow/temp/pressure control |
5 Quick Selection Criteria
1. Torque – Oversize by 25%
| Valve Size | Floating Ball (lb·in) | Trunnion Ball (lb·in) |
|---|---|---|
| 1/2" | 35 | 50 |
| 1" | 80 | 120 |
| 2" | 250 | 350 |
| 3" | 550 | 700 |
| 4" | 1,000 | 1,200 |
→ Multiply by 1.25 for safety factor.
2. Power Supply
| Voltage | Best For |
|---|---|
| 24V DC | Solar/battery, hazardous area (intrinsically safe) |
| 110V AC | North America retrofit |
| 220V AC | Global standard |
| 380–480V AC | High torque (>3,000 lb·in) |
3. Control Signal – Cost Comparison (10 valves @ 100m)
| Signal | Wiring Cost | Diagnostics |
|---|---|---|
| Dry contact | $$$ ($4,500) | None |
| 4–20 mA | $$ ($3,200) | Position only |
| Modbus RTU | (2,000) | Full (torque, cycles, alarms) |
Recommendation: For >5 valves, specify Modbus RTU (2-wire daisy chain).
4. Fail-Safe (Power Loss)
| Type | Mechanism | Battery Needed? |
|---|---|---|
| Fail last position | Motor brake holds | No |
| Fail close / open | Spring return | No |
| Fail to programmed position | Battery backup | Yes (replace every 2–3 years) |
5. Enclosure Rating
| Rating | Protection | Application |
|---|---|---|
| IP65 / NEMA 4 | Dust + hose-directed water | Indoor, covered outdoor |
| IP66 / NEMA 4X | High pressure jets + corrosion | Outdoor, washdown |
| IP68 | Continuous immersion | Pits, subsea |
| Ex d (flameproof) | Explosion containment | Hazardous areas (gas) |
Quick Installation & Wiring
Modbus RTU (2-wire daisy chain)
| Pin | Signal | Cable |
|---|---|---|
| A (D+) | Non-inverting | Belden 9841 twisted pair |
| B (D-) | Inverting | Belden 9841 twisted pair |
| Shield | Drain | Ground at controller only |
Basic ON/OFF (3-wire)
| Terminal | Signal |
|---|---|
| L | Common |
| Open | Drives open |
| Close | Drives close |
Common Issues – Fast Fixes
| Symptom | Cause | Fix |
|---|---|---|
| Hums but no movement | Bad capacitor or low voltage | Replace capacitor; check supply |
| Stops before full travel | Torque switch tripped | Manual cycle; lubricate seats |
| Modbus timeout | Wrong address/baud rate | Verify settings |
| Water inside housing | Damaged conduit seal | Replace seal; add breather drain |
Maintenance Schedule (Minimal)
| Interval | Task |
|---|---|
| Monthly | Visual check for water in conduit |
| Quarterly | Manual override test |
| Annually | Grease gearbox |
| Every 2 years | Replace DC batteries (if equipped) |
| Every 5 years | Full overhaul (capacitors, seals, bearings) |
Kinko Motorized Ball Valve Series – Quick Spec Table
| Valve Type | Actuator Type | Torque (lb·in) | Power | Control Signal | Enclosure | Fail-Safe | Size Range | |
|---|---|---|---|---|---|---|---|---|
| Floating (brass/SS) | ON/OFF | 50–500 | 24V DC, 110/220V AC | Dry contact | IP65 | Last position | 1/4"–2" | |
| Floating (CF8M) | ON/OFF | 200–1,500 | 220V AC, 24V DC | Dry contact or Modbus | IP66 | Spring-return | 1/2"–3" | |
| Trunnion (carbon) | Modulating | 500–4,000 | 220/380V AC | 4–20 mA | IP67 | Battery backup | 2"–8" | |
| Trunnion (F316) | High-cycle | 800–6,000 | 24V DC | Profibus or Modbus | Ex d (flameproof) | Spring-return | 1"–6" | |
| V-port (CF8M) | Modulating | 150–1,000 | 24V DC | 4–20 mA + HART | IP65 | Last position | 1/2"–3" | |
| Sanitary (316L) | ON/OFF or Mod | 80–500 | 24V DC | Dry or 4–20 mA | IP69K | Last position | 1/2"–4" (tri-clamp) | |
| High-pressure | ON/OFF | 2,000–15,000 | 380–480V AC | Modbus | IP68 | Spring or battery | 1/2"–2" (API 6A) |
Motorized vs. Pneumatic – When to Choose Which
| Criteria | Motorized | Pneumatic |
|---|---|---|
| Instrument air required? | No | Yes |
| Hazardous area (gas) | Needs Ex d / Ex ib | Best (no arcing) |
| Modulating precision | Excellent (0.1%) | Poor (dead band >2%) |
| Energy cost | Low (only when moving) | High (continuous leakage) |
| Fail-safe with no utility | Spring return works | Spring return works |
| Speed (<1 sec cycle) | No (2–60 sec) | Yes (0.2–2 sec) |
Conclusion
Select motorized ball valves when:
No instrument air available
Precision modulating control needed
Remote diagnostics required (Modbus)
Energy cost matters
Kinko delivers: Torque calculations within 24 hours. Full Modbus register map available. IP68 and Ex d certified series in stock.
Ivan (Mobile:+86-18968769287)
WhatsApp：+86-13579991606
Wechat:+86-18968769287
Website： www.kinko-flow.com
ZHEJIANG KINKO FLUID EQUIPMENT CO.,LTD
info@kinko-flow.com
+86-133 5611 9006
