Butterfly Valves

Wafer / Lug / Flanged Type | DN50 - DN1200

ZNX butterfly valves are designed for reliable shut-off and flow control in water treatment, HVAC, fire protection, desalination, and general industrial applications. Featuring a one-piece body design with a corrosion-resistant disc and a replaceable seat, our butterfly valves offer long service life with low torque operation.

Available in wafer, lug and double flanged body styles, plus a fully PTFE-lined series for corrosive chemical service, with manual gearbox, electric, or pneumatic actuators. All valves are 100% pressure tested before shipment.

Technical Specifications

Size Range	DN50 - DN1200 (2" - 48")
Pressure Rating	PN10, PN16, ANSI 150
Body Material	Ductile Iron, Cast Iron, Stainless Steel, WCB
Disc Material	SS304, SS316, Ductile Iron (Ni-plated), Bronze
Seat Material	EPDM, NBR, PTFE, Viton, Hypalon
Stem Material	SS416, SS304, SS316
Connection	Wafer, Lug, Double Flanged (ANSI, DIN, BS, JIS)
Operation	Lever, Gearbox, Electric, Pneumatic Actuator
Working Temp.	-20°C to +200°C (depending on seat)
Standard	API 609, EN 593, MSS SP-67, AWWA C504
Face to Face	ISO 5752 Series 13/14, API 609
Testing	API 598, EN 12266

Key Features

One-piece ductile iron body for high strength and durability
Replaceable EPDM/NBR/PTFE seat for easy maintenance
SS316 disc with polished edge for bubble-tight shutoff
ISO 5211 mounting pad for direct actuator installation
Bi-directional sealing suitable for dead-end service (lug type)
Low operating torque, easy manual or automated operation
100% shell and seat hydrostatic tested before shipment

Applications

Municipal water supply and distribution networks
Wastewater and sewage treatment plants
Seawater desalination RO systems
HVAC and chilled water systems
Fire protection and sprinkler systems
Power plant cooling water circuits
Chemical, petroleum, and general industrial pipelines

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Product Series

Four dedicated butterfly valve series covering general water service to highly corrosive chemical lines.

Series 1

Wafer Butterfly Valve

DN50 - DN1200 | PN10 / PN16 / ANSI 150 | Concentric

The wafer type has a slim, center-offset-free body that is sandwiched between two pipe flanges by long through-bolts. It is the lightest and most economical butterfly valve design, ideal for compact installations in water, HVAC and fire protection systems.

Technical Specifications

Size Range	DN50 - DN1200 (2" - 48")
Pressure Rating	PN10, PN16, ANSI 150
Body Material	Ductile Iron GJS400-18, Cast Iron GJL250
Disc Material	SS304, SS316, Ductile Iron (Ni-plated)
Seat Material	EPDM, NBR
Connection	Wafer (through-bolt mounting)
Face to Face	ISO 5752 Series 20, EN 558-1 Series 13/14
Working Temp.	-20°C to +120°C (EPDM), -10°C to +80°C (NBR)
Standard	API 609, EN 593, MSS SP-67

Key Features

Short face-to-face dimension, minimal space requirement
Lowest weight and cost among butterfly valve types
Bi-directional flow, suitable for most non-dead-end services
Replaceable EPDM seat, repairable in-line
ISO 5211 mounting pad for lever, gearbox or actuator

Series 2

Lug Butterfly Valve

DN50 - DN600 | PN16 / ANSI 150 | Dead-End Rated

The lug type body carries tapped lug bosses on both sides, allowing each pipe flange to be bolted independently. This enables dead-end (end-of-line) service and downstream maintenance without draining the whole line — a requirement in fire protection, HVAC and building services.

Technical Specifications

Size Range	DN50 - DN600 (2" - 24")
Pressure Rating	PN16, ANSI 150 (dead-end rated to full pressure)
Body Material	Ductile Iron GJS400-18 with SS304 / bronze lugs
Disc Material	SS304, SS316, Ductile Iron (Ni-plated)
Seat Material	EPDM, NBR
Connection	Lug (tapped bosses, both flanges independent)
Face to Face	ISO 5752 Series 20, EN 558-1 Series 13/14
Working Temp.	-20°C to +120°C (EPDM)
Standard	API 609, EN 593, MSS SP-67, UL/FM optional

Key Features

Dead-end service rated — full pressure at line end
Downstream piping can be removed without draining upstream
Stainless steel or bronze threaded lug inserts
Ideal for fire protection (UL/FM listed versions available)
Two-piece stem with blowout-proof design

Series 3

Double Flange Butterfly Valve

DN150 - DN2000 | PN10 / PN16 / PN25 | Gear Operated

The double flange type has full flanges on both ends, providing the most robust connection for large diameters, buried pipelines and high static pressure. Combined with a gearbox or electric actuator, it is the standard choice for municipal waterworks and pump stations.

Technical Specifications

Size Range	DN150 - DN2000 (6" - 80")
Pressure Rating	PN10, PN16, PN25
Body Material	Ductile Iron GJS400-18, epoxy coated RAL 5000
Disc Material	SS304, SS316, Ductile Iron (Ni-plated / epoxy coated)
Seat Material	EPDM, NBR
Connection	Flanged both ends (ANSI 150, PN10/16, JIS 10K)
Operation	Gearbox from DN350, electric / pneumatic actuators
Working Temp.	-10°C to +120°C (EPDM)
Standard	API 609, EN 593, AWWA C504, MSS SP-67

Key Features

Full-flanged body for maximum structural strength at large sizes
Suitable for buried service and pump discharge lines
250μm fusion epoxy coating inside and outside, drinking-water grade
Self-lubricating bearing and shaft seal, maintenance-free
Double eccentric (high performance) options on request

Series 4

PTFE Lined Butterfly Valve

DN50 - DN600 | PN10 / PN16 | Corrosion Resistant

The PTFE (Teflon) lined series has a ductile iron or steel body fully lined with PTFE/PFA, together with a lined or solid SS316 disc. It is built for aggressive media — acids, alkalis, chlorinated brine and solvents — where metal valves corrode rapidly.

Technical Specifications

Size Range	DN50 - DN600 (2" - 24")
Pressure Rating	PN10, PN16
Body Material	Ductile iron / WCB steel, fully PTFE or PFA lined
Disc Material	SS316 (solid) or SS316 + PTFE encapsulated
Seat Material	PTFE liner forming the sealing surface
Connection	Wafer, lug or flanged
Working Temp.	-29°C to +180°C (depending on lining)
Vacuum Rating	Up to full vacuum (lined & reinforced design)
Standard	EN 593, MSS SP-67; spark test on lining

Key Features

Excellent resistance to almost all chemicals (pH 0-14)
3mm+ thick PTFE/PFA lining, 100% spark tested
Anti-static and low friction — smooth operation, no sticking
Ideal for chlor-alkali, chemical dosing and plating lines
Zero contamination of media — food/pharma grade options

ZNX VALVE

Butterfly Valves