KINKO Butterfly Valves: Design and Performance Features for Industrial Reliability

Publish Time: 06/13 2026 Author: Site Editor Visit: 1

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
ZHEJIANG KINKO FLUID EQUIPMENT CO.,LTD