Spirax Sarco ABV21i and ABV40i are integrated reduced-bore pneumatic boiler blowdown ball valves. The valves feature galvanized carbon steel valve bodies in ASTM A216 WCB and reinforced PTFE seats, equipped with spring-return pneumatic actuators for rapid reset on power loss, with PN40 or ASME Class 300 flange connections. Specifically designed for timed bottom blowdown systems on steam boilers, they can be used with blowdown controllers for rapid opening and closing to reduce heat loss. Valve status can also be integrated into building management systems for monitoring by installing a switch box.
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Spirax Sarco ABV21i/ABV40i Pneumatic Boiler Blowdown Ball Valves
Pneumatic boiler bottom blowdown ball valves with PN40 and Class 300 flange connections.
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Specifications
- Valve Type
- Integrated reduced-bore ball valve
- Actuator
- 90° rotary spring-return pneumatic actuator
- Fail-Safe Mode
- Spring return on failure of closing operation
- Nominal Diameter
- DN25, DN32, DN40, DN50, DN65
- Flange Connection Rating
- PN40, ANSI/ASME Class 300
- Flange Standard
- EN 1092-1, ASME B16.5
- Actuator Mounting Standard
- ISO 5211
- Solenoid Valve Mounting Interface
- NAMUR (VDI/VDE 3845)
- Compressed Air Connection
- Port A, 1/4 in BSP
- Full-Stroke Operating Time
- 0.25 - 0.6 seconds
- Actuating Medium
- Clean compressed air or non-corrosive gas
- Maximum Compressed Air Pressure
- 8 barg
- Maximum Saturated Steam Operating Pressure
- 17.25 bar g
- Maximum Allowable Valve Body Pressure
- ABV21i: 40 bar g @ 120°C; ABV40i: 51 bar g @ 38°C
- Maximum Allowable Temperature
- 260°C @ 0 bar g
- Minimum Operating Temperature
- -29°C
- Valve Body Kv Value
- DN25: 30; DN32: 40; DN40: 81; DN50: 103; DN65: 197
- Valve Body Material
- Galvanized carbon steel, ASTM A216 WCB
- Seat Material
- Carbon- and graphite-reinforced PTFE (PDR 0.8)
- Protection Rating
- IP67
Application scenarios
Timed Steam Boiler Bottom Blowdown Systems
For steam boiler bottom blowdown piping, ABV21i and ABV40i can be used with Spirax Sarco blowdown controllers to open and close rapidly at set intervals, enabling boiler bottom blowdown while reducing repeated discharge and unnecessary heat loss.
Boiler Blowdown Valve Monitoring Integrated with Building Management Systems
For boiler rooms requiring boiler bottom blowdown valve status to be integrated into a building management system. A switch box can be installed on the actuator, with one or two switches connected to the building management system for valve status monitoring.
FAQ
How do ABV21i and ABV40i provide automatic boiler bottom blowdown?
This series combines integrated reduced-bore ball valves with 90° rotary pneumatic actuators and can be used with a blowdown controller for timed boiler bottom blowdown control, helping reduce heat loss, repeated discharge, and leakage risk.
What protection is provided if the air supply or control system malfunctions?
The pneumatic actuator uses a spring-return design. If the closing operation fails, the valve can return by spring action to provide fail-safe protection.
What sizes and flange connection options are available for ABV21i and ABV40i?
Available sizes are DN25, DN32, DN40, DN50, and DN65. Flange connections are available in PN40 or ANSI 16.5 Class 300; ABV21i valve bodies are designed for PN40, while ABV40i valve bodies are designed for ASME 300. The specific configuration must be confirmed according to the actual model and application conditions.
What are the installation requirements for flow direction, air supply, and solenoid valves?
Fluid flow direction must match the arrow on the valve body. The actuator uses clean compressed air or non-corrosive gas, with a maximum compressed air pressure of 8 barg. Solenoid valves compliant with NAMUR interface requirements can be installed, and MV series solenoid valves are also available. Where a remotely mounted solenoid valve is required, compressed air can be connected directly to the 1/4 in BSP connection at actuator port “A”.
What spare parts are available for ABV21i and ABV40i?
Actuator spare parts kits are available for O-ring sets, gears, gaskets, and other components. Valve body spare parts include seats, internal O-rings, and stem seals; the spare parts ranges differ between DN25 to DN50 and DN65. No spare parts are available for switch boxes. When ordering, specify the valve or actuator model and nominal diameter.