Pneumatic Operated Plastic Butterfly Valve
Pneumatic Operated Plastic Butterfly Valve - 1268 Series
Pneumatic Operated Plastic Butterfly Valves are designed for efficient ON–OFF and modulating flow control in chemical, water, and corrosive media applications. Manufactured from high-quality thermoplastics, these valves offer excellent corrosion resistance, lightweight construction, and long service life, making them ideal for environments where metal valves are unsuitable.
The valves are available in wafer and lug styles, offering flexibility in installation. Wafer-type valves are the most commonly used and cost-effective, installed between two flanges, while lug-type valves allow one side of the pipeline to be disconnected without disturbing the valve—ideal for maintenance and isolation purposes. Combined with pneumatic actuation, the valve provides fast response, high cycle life, and reliable operation in automated process systems.
Technical Specifications
Parameter
Series
1268 Series
Valve Type
Pneumatic Operated Plastic Butterfly Valve
Body Type
Semi-Lug / Wafer
Sizes
DN25 to DN600
Pressure Rating
PN10
Body Material
PVC / PP / PVDF
Disc Material
PVC / PP / PVDF
Shaft Material
Stainless Steel
Seat / Liner
EPDM / Viton / Nitrile
Pressure Rating (PVC)
175 PSI at 24°C
Max. Temperature (PVC)
: 60°C
Mounting
ISO Actuator Mounting Dimensions
Pneumatic Actuators
Double-Acting Pneumatic Actuator (Stay-Put) Spring-Return Pneumatic Actuator (Fail-Safe)
Double Acting
4-Way / 5-Port (Single / Double Coil)
Spring Return
3-Way (Single / Double Coil)
Double Acting
3.5 – 8.5 kg/cm²
Spring Return
4.0 – 8.5 kg/cm²
Design & Construction:
Solid one-piece moulded plastic body with full-body liner isolates the shaft and valve body from the process media, ensuring leak-free and corrosion-free operation.
Working Principle:
Working Principle
The pneumatic actuator rotates the butterfly disc through a 90° quarter-turn motion
Open Position
Disc aligns parallel to flow, allowing unrestricted passage
Closed Position
Disc rotates perpendicular to flow, providing tight shut-off
Modulating Control
With a positioner, intermediate disc positions enable accurate flow regulation
The full-body liner isolates the shaft and valve body from the process media, ensuring leak-free and corrosion-free operation.
The full-body liner isolates the shaft and valve body from the process media, ensuring leak-free and corrosion-free operation.
Automation & Control Options:
- Control Modes: On/Off, Modulating (via Positioner)
- Actuator Types: Double Acting, Spring Return (Fail-Safe)
- Air Control: Solenoid Valves (3/2, 5/2), FRL Unit (Filter Regulator Lubricator)
- Feedback Systems: Limit Switches, Position Indicator / Transmitter
- Position Control: Valve Positioner, Electro-Pneumatic Positioner, I/P Converter
- Instrumentation: Pressure Transmitter, PID Controller (PT-100 Integration)
Key Features & Advantages
- Compact and lightweight construction
- High corrosion resistance – no rust
- Solid one-piece moulded plastic body
- Full-body V-notch liner for enhanced sealing
- Blowout-proof stainless steel shaft
- Fully supported flange bolt holes
- Increased Cv for improved flow efficiency
- Abrasion-resistant internal surfaces
- Seat over-tightening protection
- Elastomer seat with stainless retaining ring
- ISO actuator mounting dimensions
- Easy installation and maintenance
Optional Accessories:
- Pressure Regulator
- Filter Regulator with Lubricator (FRL)
- Limit Switches
- Gearbox with Handwheel for manual operation
- Valve Positioner
- I/P Converter
- Electro-Pneumatic Positioner
- Position Indicator / Position Transmitter
- Cyclic Timer / Sequential Timer
- 3-Way / 4-Way Key-Operated Valves
- Signal Stimulator
- Travel Stops & Flow Restrictors
- Silencers with Flow Control
- PID Controller with PT-100 Sensor (panel-mounted)
- Pressure Transmitter with Control Panel
Industries Served
Water distribution systems
Chemical processing plants
Acid & alkali handling
Industrial utility pipelines
Typical Applications:
Corrosive media pipelines, chemical dosing systems, wastewater treatment lines, scrubber applications, and industrial utility automation.
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