API609 WCB Cast Steel Pneumatic Wafer Butterfly Valve

Product Overview

The API609 WCB Cast Steel Pneumatic Wafer Butterfly Valve is a high-performance automatic quarter-turn industrial valve manufactured in strict accordance with American API609 industrial butterfly valve standards. The valve body is integrally precision cast from standard ASTM A216 WCB carbon steel, featuring dense internal structure, high pressure resistance and excellent high-temperature stability, effectively overcoming the deformation and low-temperature brittleness defects of traditional cast iron butterfly valves under harsh industrial working conditions. Adopting wafer clamped connection structure, the face-to-face dimension complies with ASME B16.10 standard, which can be directly installed and fixed between two pipeline flanges without additional flange matching, greatly saving pipeline installation space and engineering cost.

Equipped with ISO5211 standard pneumatic rack and pinion actuator, the valve realizes fast automatic 90° opening and closing and flow regulation. It supports double-acting and single-acting (spring return) control modes, meeting automatic cut-off and emergency shutoff requirements. All product design, pressure grades and factory tests fully comply with ASME B16.5 and API598 specifications. With reliable sealing performance and stable pneumatic actuation, it is widely used in petrochemical, thermal power, water treatment, industrial gas and medium-temperature medium pipeline systems.

Core Product Features

1. Full API609 American Standard Compliance
Designed and produced strictly in accordance with API609 Category AB butterfly valve specifications, matching ASME B16.10 face-to-face dimension, ASME B16.5 pressure grade and API598 hydrostatic test standards. All products pass 100% factory shell pressure test and sealing test, fully meeting international industrial pipeline engineering acceptance and third-party inspection standards.

2. Premium WCB Cast Steel Heavy-Duty Body
Adopts ASTM A216 WCB carbon steel integral precision casting, with high mechanical strength and structural rigidity. It operates stably in the working temperature range of -29℃ to 425℃, resisting pipeline pressure impact and structural deformation. Compared with ductile iron valves, WCB cast steel has stronger high-temperature resistance and fatigue resistance, suitable for medium and high-pressure harsh industrial pipeline conditions.

3. Compact Wafer Clamped Connection Design
Optimized ultra-short wafer type structure, no need for flange welding or bolt flange matching during installation. The valve is directly clamped between pipeline flanges, featuring simple installation, firm positioning and strong vibration resistance. It effectively reduces the overall pipeline occupation space, especially suitable for limited-space pipeline layout scenarios.

4. High-Sensitivity Pneumatic Automatic Control
Matched with high-precision rack and pinion pneumatic actuator, realizing fast and stable quarter-turn switching. Optional double-acting continuous drive and single-acting spring reset function, which can automatically close or open in case of air source failure to ensure pipeline safety. Supporting 4-20mA signal regulation, it meets automatic process control system requirements.

5. Dual Soft & Hard Sealing Optional
Supports multiple sealing configurations: EPDM/NBR/Viton soft seat achieves ANSI Class VI zero leakage for water, gas and low-temperature oil media; metal hard seal structure adapts high-temperature and high-pressure industrial media. Diversified sealing solutions fully cover different working condition demands.

6. Standard ISO5211 Universal Mounting
The valve top flange adopts ISO5211 standard actuator mounting dimension, with high versatility and replaceability. It is compatible with various pneumatic, electric and worm gear actuators, convenient for later equipment upgrade and maintenance replacement.

7. Anti-Corrosion & Wear-Resistant Structure
The WCB valve body is treated with high-grade epoxy anti-rust coating to resist atmospheric corrosion and medium erosion. The valve disc is made of stainless steel with anti-scouring treatment, ensuring long-term stable operation and effectively extending the valve service life.

Technical Specifications

Installation, Operation & Maintenance Notes

1. Standard Operation Guidelines
This API609 pneumatic wafer butterfly valve is suitable for pipeline full open/closed isolation and flow regulation. Long-term small-opening throttling is prohibited for soft seal versions to prevent high-speed medium scouring and seat damage. Operation beyond rated Class150/Class300 pressure and temperature limits is forbidden to avoid WCB material fatigue deformation and sealing failure.

2. Professional Wafer Installation Requirements
Install the valve on the straight pipe section, keep away from pump outlets, elbows and turbulent flow areas. Align the valve center with the pipeline flange center, clamp the valve body between two flanges evenly, and tighten bolts diagonally and symmetrically to prevent eccentric stress and medium leakage. Clean pipeline welding slag and hard impurities before installation to protect the sealing surface.

3. Pneumatic Actuator Maintenance
Regularly drain water and dirt from the air source filter to ensure clean and dry air supply for the pneumatic actuator. Check the cylinder sealing and piston operation status regularly to avoid air leakage and slow valve action. Lubricate transmission parts periodically to keep switching flexible and sensitive.

4. Daily Sealing & Structural Inspection
Regularly check the wear and aging of the valve seat and stem packing. For long-term continuous operation, conduct regular pressure holding tests. Replace aging accessories in time after full pipeline depressurization and medium drainage to maintain zero leakage performance and stable automatic control.

Wide Application Scenarios

• Petrochemical Industry: Refined oil, fuel oil and mild corrosive medium automatic cut-off and regulation pipeline systems

• Thermal Power & Energy Plants: Power plant circulating water, auxiliary flue gas and industrial gas automatic control pipelines

• Municipal Water Treatment: Urban water supply, sewage treatment and large-flow water circulation automatic valve systems

• General Industrial Pipeline: Factory compressed air, process circulating water and public engineering pipeline control equipment

• HVAC & Central Heating System: Industrial park hot water circulation and ventilation pipeline automatic isolation valves

Product Competitive Advantages

✅ Genuine API609 Standard Compliance — Fully compliant with American industrial butterfly valve specifications, passing API598 strict testing and international project acceptance.

✅ WCB Cast Steel Heavy-Duty Body — High temperature and pressure resistant cast steel structure, more durable than cast iron valves for harsh industrial conditions.

✅ Space-Saving Wafer Design — Compact clamped structure, simple installation, saving pipeline space and construction cost.

✅ Stable Pneumatic Automatic Control — High-sensitivity pneumatic actuator, fast switching, optional emergency reset function for pipeline safety.

✅ Dual Sealing Solution — Soft seal zero leakage & hard seal high-temperature resistance, covering multiple working condition requirements.

✅ Universal ISO5211 Mounting — Standard actuator interface, strong versatility, convenient for later maintenance and upgrading.

Order & Certification Information

MOQ: 1 Unit
Production Lead Time: 10–20 working days for standard specifications
Supporting Documents: EN10204 3.1 WCB Material Certificate, API609 Test Report, API598 Inspection Report, ISO9001 Quality Certificate
Export Packaging: Internal anti-rust protection + Plastic wrap + Reinforced fumigation-free wooden export case
Warranty Service: 12-month quality warranty + lifelong professional after-sales technical support

Contact Us for customized pressure grades, sealing types and bulk preferential prices of API609 WCB Cast Steel Pneumatic Wafer Butterfly Valves.

What Is an API Pneumatic Butterfly Valve

An API Pneumatic Butterfly Valve is an automated quarter turn valve designed to regulate or isolate the flow of liquids, gases, and other process media. It features a rotating disc mounted on a shaft, while a pneumatic actuator uses compressed air to control opening and closing. Manufactured in accordance with API requirements, the valve provides reliable sealing and operational stability. Its compact structure and quick response make it suitable for oil and gas, chemical, power generation, and water treatment applications.

Why the API Pneumatic Butterfly Valve Matters

This valve is important because it provides efficient flow control and supports automated process operation. Pneumatic actuation enables rapid response and reliable performance in demanding industrial environments. It is especially suitable for applications where remote control and safe operation are required. API compliant construction ensures consistent quality and dependable sealing, helping protect equipment and maintain stable system performance under varying operating conditions.

Common Product Types by API Pneumatic Butterfly Valve

Common product types include concentric butterfly valves, double offset butterfly valves, and triple offset butterfly valves. Soft seated versions are commonly used for water and general service, while metal seated designs are preferred for high temperature and abrasive media. Pneumatic actuators are available in double acting and spring return configurations. Optional accessories such as positioners, solenoid valves, limit switches, and air preparation units can enhance control and monitoring capabilities.

Key Advantages of API Pneumatic Butterfly Valve

The valve offers fast operation, low operating torque, and reliable sealing performance. Pneumatic actuation allows automatic control and easy integration with industrial control systems. The compact and lightweight design reduces installation space and simplifies maintenance. With suitable seat and body materials, the valve can handle corrosive, high temperature, and demanding service conditions. API compliant construction contributes to long service life and dependable operation.

API Pneumatic Butterfly Valve Machine Structure and Core Stations

Manufacturing begins with casting or forging the valve body, disc, and shaft components from appropriate materials. Core stations include heat treatment, CNC machining of sealing surfaces, shaft bores, and disc profiles. Assembly stations install the shaft, seat, bearings, seals, and pneumatic actuator with related accessories. Final operations include actuator adjustment, pressure testing, surface treatment, marking, cleaning, and packaging to ensure accurate operation and reliable sealing performance.