KINKO Butterfly Valves: Design and Performance Features for Industrial Reliability
Date：2026-06-13 10:51:25 Author：Zhejiang Kinko Fluid Equipment Co., Ltd
1. KINKO Design Philosophy (5 Core Principles)
| Principle | Engineering Outcome |
|---|
| Blow-out proof stem | Stem cannot eject under pressure — zero safety incidents |
| Double O-ring stem sealing | Redundant sealing — no stem leakage for 10+ years |
| PTFE-impregnated bearings | Low operating torque, no galling, 1M+ cycles |
| ISO 5211 top flange | Direct actuator mounting — no brackets for most sizes |
| Fully replaceable seat | Lower maintenance cost — keep body, change seat |
2. Key Design Features (Exploded View Reference)
| Component | KINKO Design | Benefit |
|---|
| Body | Ductile iron GGG40 (standard) or CF8M (SS316) | Higher strength vs cast iron; corrosion resistant options |
| Disc | Epoxy-coated ductile iron (min 250μm) or SS316 | Smooth surface = lower torque; edge-hardened for abrasion |
| Stem | SS416 (standard) or SS316 (marine/chemical) | Blow-out proof stepped design; double O-ring groove |
| Seat | EPDM, NBR, PTFE, Viton — fully replaceable | Field-replaceable without special tools |
| Bearings | PTFE-impregnated bronze or pure PTFE | Self-lubricating; eliminates stem galling |
| Top flange | ISO 5211 F05/F07/F10/F12/F14 | Direct mount pneumatic/electric actuators |
| Disc-to-stem connection | Double D or hexagonal drive | No backlash; positive torque transmission |
3. Performance Specifications by Series
3.1 KINKO Standard Wafer Series (KVW)
| Parameter | Value |
|---|
| Size range | DN50 – DN600 (2″–24″) |
| Pressure rating | PN10 / PN16 (up to 16 bar) |
| Temperature range | -20°C to +120°C (EPDM) / -10°C to +90°C (NBR) |
| Body material | Ductile iron (GGG40) |
| Disc material | Epoxy-coated ductile iron or SS304/SS316 |
| Seat options | EPDM, NBR, Viton, PTFE |
| Top flange | ISO 5211 F05–F12 |
| Shutoff leakage | Zero leakage (Class VI with soft seat) |
3.2 KINKO Lug Series (KVL)
| Parameter | Value |
|---|
| Size range | DN50 – DN300 (2″–12″) |
| Pressure rating | PN16 / PN25 |
| Temperature range | -20°C to +200°C (with PTFE seat) |
| Body material | Ductile iron or CF8M (SS316) |
| Feature | End-of-line service capable |
| Threaded inserts | SS304 or SS316 (corrosion resistant) |
3.3 KINKO PTFE-Lined Series (KVP)
| Parameter | Value |
|---|
| Size range | DN50 – DN300 (2″–12″) |
| Pressure rating | PN10 / PN16 |
| Temperature range | -40°C to +200°C |
| Liner material | Virgin PTFE (full liner) |
| Disc material | PTFE-coated SS316 or solid SS316 |
| Application | Aggressive chemicals, acids, solvents |
| Shutoff | Class VI (zero visible leakage) |
4. Torque Performance Data (for Actuator Sizing)
Test condition: Dry, no media pressure, EPDM seat.
| Valve Size | Break Torque (Nm) | Running Torque (Nm) | End Torque (Nm) |
|---|
| DN50 | 8–12 | 5–8 | 6–10 |
| DN80 | 15–20 | 10–15 | 12–18 |
| DN100 | 22–28 | 15–20 | 18–25 |
| DN150 | 40–50 | 25–35 | 35–45 |
| DN200 | 65–80 | 45–55 | 55–70 |
| DN250 | 95–120 | 65–80 | 80–100 |
| DN300 | 130–160 | 90–110 | 110–140 |
Media pressure multiplies torque. At 10 bar line pressure, add 30–50% to above values. KINKO provides full torque curves on request.
5. Pressure-Temperature Rating Table
| Seat Material | Max Pressure at 20°C | Max Pressure at 100°C | Max Pressure at 150°C | Max Temp |
|---|
| EPDM | 16 bar | 12 bar | Not rated | 120°C |
| NBR | 16 bar | 8 bar | Not rated | 90°C |
| Viton | 16 bar | 14 bar | 10 bar | 180°C |
| PTFE | 16 bar | 12 bar | 8 bar | 200°C |
De-rate by 2% per °C above 100°C for PTFE seats.
6. Quality Testing (Every KINKO Valve)
| Test | Method | Acceptance Criteria |
|---|
| Shell test (body) | Hydrostatic, 1.5x rated pressure | No visible leakage |
| Seat test | Hydrostatic, 1.1x rated pressure | Zero leakage (Class VI) |
| Stem seal test | Air under water, 6 bar | No bubbles for 60 seconds |
| Operating torque test | Cycle test fixture | Within published range |
| Coating thickness | Magnetic gauge | ≥250μm (epoxy) |
Each valve is serialized and ships with a test report (EN 10204 3.1 available).
7. Cycle Life Testing (Independent Lab)
| Valve Size | Seat Type | Test Cycles | Result |
|---|
| DN100 | EPDM | 250,000 | No leakage, torque within +15% |
| DN150 | PTFE | 100,000 | No leakage, seat wear <0.1mm |
| DN200 | EPDM | 500,000 | No leakage, bearings intact |
| DN80 | Viton | 150,000 | No measurable wear |
Design target: 500,000 cycles minimum for EPDM-seated valves in clean media.
8. Dimensional Summary (ISO 5752 Short Pattern)
| Valve Size | Face-to-Face (mm) | ISO 5211 Flange | Bolt Circle (mm) |
|---|
| DN50 | 43 | F05 | 50 |
| DN80 | 46 | F07 | 70 |
| DN100 | 52 | F07 | 70 |
| DN150 | 56 | F10 | 90 |
| DN200 | 60 | F12 | 125 |
| DN250 | 68 | F12 | 125 |
| DN300 | 78 | F14 | 140 |
Full dimensional CAD drawings available in .dwg and .step formats.
9. KINKO vs. Competitors: Feature Comparison (DN150)
| Feature | KINKO | Brand A | Brand B |
|---|
| Body material | Ductile iron | Cast iron | Ductile iron |
| Stem design | Blow-out proof | Standard | Blow-out proof |
| Stem seals | Double O-ring | Single O-ring | Double O-ring |
| Bearings | PTFE-impregnated | Bronze | Plastic |
| ISO 5211 mount | Standard (all sizes) | Optional | Standard (DN200+) |
| Replaceable seat | Yes (all) | Yes | Yes |
| Coating thickness | 250μm min | 150μm | 200μm |
| Warranty | 24 months | 12 months | 18 months |
10. Why Engineers Choose KINKO (Summary)
| Reason | Evidence |
|---|
| Lower lifecycle cost | Replaceable seat, double O-ring stem |
| Easy actuator mounting | ISO 5211 standard on all sizes |
| Documented performance | Torque curves, cycle test data, test reports |
| Material traceability | EN 10204 3.1 certification available |
| Global compatibility | ISO, API, MSS, EN standards |
| Fast delivery | Stock valves ship in 5–10 days |
KINKO Product Line Overview
| Series | Key Feature | Best For |
|---|
| KVW (Wafer) | Most economical | General water, air, mild chemicals |
| KVL (Lug) | End-of-line service | Isolation with downstream removal |
| KVP (PTFE-lined) | Full chemical resistance | Acids, solvents, aggressive media |
| KVS (Sanitary) | FDA-compliant SS316 | Food, beverage, pharmaceutical |
| KVT (High temp) | Metal seated | Steam, high temp, abrasive |
Ivan (Mobile:+86-18968769287)
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Website：www.kinko-flow.com
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