Pneumatic Wafer Butterfly Valve

Product Overview

The Pneumatic Wafer Butterfly Valve features a slim, wafer-style body that is clamped between two pipeline flanges without the need for separate mounting bolts. This design minimizes installation space and reduces overall system weight, making it ideal for applications where space is limited.

Powered by a reliable pneumatic actuator, this valve offers fast, efficient on/off operation or modulating control. The actuator is typically controlled by a solenoid valve and can be equipped with positioners for proportional flow regulation using 4-20mA signals.

Constructed from durable materials such as ductile iron or stainless steel, and featuring resilient seats (EPDM, NBR, PTFE), the Pneumatic Wafer Butterfly Valve provides excellent sealing performance and corrosion resistance for a wide range of media, including water, air, oil, and mild chemicals.

Key Features & Benefits

Pneumatic Actuation

Offers fast, reliable, and cost-effective automated operation using compressed air, suitable for a wide range of industrial environments.

Compact Wafer Design

Features a slim profile for space-saving installation, clamped between pipeline flanges without requiring additional flange bolts.

Modulating Control Option

Can be equipped with a positioner for proportional flow control using 4-20mA signals, enabling precise flow regulation in automated systems.

Resilient Seating

Provides superior sealing performance with resilient materials (EPDM, NBR, PTFE), suitable for a wide range of media and temperatures.

Cost-Effective Solution

Offers a balance of performance and affordability, making it an excellent choice for general industrial and commercial flow control applications.

ISO 5752 & API 609 Compliance

Designed and manufactured to meet international standards, ensuring compatibility and reliability in global industrial applications.

Technical Specifications

Basic Parameters

Parameter	Specification Range
Nominal Diameter (DN/NPS)	DN50 ~ DN1200 (2" ~ 48")
Nominal Pressure (PN/Class)	PN10, PN16 Class 150
Operating Temperature	-40°F ~ 392°F (-40°C ~ 200°C)
Applicable Media	Water, Air, Oil, Gas, Mild Chemicals
Sealing Class	ISO 5208 Class IV or V

Material Specifications

Component	Material Options	Standards/Features
Valve Body	Ductile Iron, Carbon Steel, Stainless Steel	EN-GJS-400-15, ASTM A216 WCB, ASTM A351 CF8/CF8M
Disc	Ductile Iron, Stainless Steel	EN-GJS-400-15, AISI 304/316
Seat	EPDM, NBR, PTFE	Corrosion and Temperature Resistant
Shaft	Stainless Steel	AISI 304/316
Actuator	Pneumatic (Double-Acting or Spring-Return)	5-10 bar (70-145 psi) Air Supply, Positioner Option

Standards & Compliance

Design Standards: ISO 5752, API 609
Flange Standards: ISO 7005-1, ANSI B16.5 Class 150
Testing Standards: ISO 5208, API 598
Certifications: CE, ISO 9001

Working Principle

The Pneumatic Wafer Butterfly Valve operates using a rotating disc controlled by a pneumatic actuator:

Pneumatic Actuation: The pneumatic actuator receives compressed air signals from a control system (e.g., solenoid valve) and rotates the valve shaft to open or close the disc.
Opening Process: Rotating the disc to a parallel position with the flow direction allows media to pass through the valve with minimal pressure drop.
Closing Process: Rotating the disc to a perpendicular position blocks the flow path, creating a tight seal against the resilient seat.
Modulating Control: When equipped with a positioner, the actuator adjusts the disc position based on an input signal (e.g., 4-20mA) to maintain a desired flow rate.

Application Areas

Water & Wastewater

Municipal water supply, wastewater treatment, and irrigation systems.

HVAC & Building Services

Heating, ventilation, and air conditioning systems in commercial buildings.

Oil & Gas

Midstream pipeline transportation and distribution systems.

General Industry

Chemical processing, food and beverage, and pulp and paper industries.

Installation & Maintenance

Installation Guidelines

Inspect the valve and actuator for damage before installation. Ensure the valve is in the closed position.
Clean the pipeline flanges and ensure they are flat and free of debris. Position the valve between the flanges, ensuring proper alignment.
Use appropriate gaskets and tighten the flange bolts evenly in a crisscross pattern to ensure a leak-free seal.
Connect the actuator to the air supply and control system according to the manufacturer's instructions. Test the actuator for proper operation before commissioning.
Conduct hydrostatic testing (1.5×PN) and leakage testing after installation to verify performance.

Maintenance Recommendations

Regularly inspect the seat for signs of wear or damage. Replace the seat if necessary to maintain sealing performance.
Clean the valve interior periodically to remove any buildup or debris that may affect operation.
Check the actuator air supply and connections for leaks or blockages. Replace any faulty components as needed.
Lubricate the actuator bearings and gearbox (if equipped) annually or as per manufacturer recommendations.
For long-term shutdown, flush the valve with clean water and drain the actuator to prevent internal corrosion.

Frequently Asked Questions (FAQ)

Q: What is the difference between a wafer and lug butterfly valve?

A: A wafer butterfly valve is clamped between two pipeline flanges without its own flange bolts, making it compact and cost-effective. A lug butterfly valve has lugs (projections) with bolt holes that allow it to be mounted between flanges using its own bolts, providing easier installation and removal.

Q: Can the Pneumatic Wafer Butterfly Valve be used for throttling applications?

A: Yes, when equipped with a positioner for 4-20mA control, this valve can be used for throttling applications. However, for precise flow control, consider a control valve with a suitable flow characteristic.

Q: What is the maximum operating pressure for a Pneumatic Wafer Butterfly Valve?

A: The maximum operating pressure typically ranges from PN10 (1.0 MPa) to PN16 (1.6 MPa) or Class 150 (2.0 MPa), depending on the valve size and material. Consult the technical specifications for exact pressure ratings.

Q: Is the Pneumatic Wafer Butterfly Valve suitable for vacuum applications?

A: Yes, this valve can be used for vacuum applications with appropriate seat materials (e.g., PTFE) and actuator selection. Consult with our engineering team to ensure the valve is properly configured for your vacuum service requirements.

Need Custom Solutions?

Our engineering team can customize Pneumatic Wafer Butterfly Valves to meet your specific pressure, temperature, and media requirements. Contact us today for a personalized quote.

Contact Our Technical Team