Boiler house Blowdown vessels
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Local regulations may restrict the use of this product to below the conditions quoted. In the interests of development and improvement of the product, we reserve the right to change the specification without notice. © Copyright 2017
TI-P405-45 EMM Issue 3
ABV21i and ABV40i Air Actuated Boiler Blowdown Valves
Description The Spirax Sarco ABV21i and ABV40i one piece end entry, reduced bore ball valves are fitted with 90 ° rotary spring return pneumatic actuator, for boiler blowdown duties. They are used in conjunction with a Spirax Sarco blowdown timer to provide timed control of bottom blowdown, ensuring that the recommended boiler blowdown cycles occur with minimum heat loss, avoiding duplication or omission. The pneumatic actuator, (which can also be operated with other non-corrosive gases), moves through 90 ° to open the valve, and has a spring return fail-close operation. A switch box is mounted on the actuator, and either or both microswitches may be wired to a Building Management System if required. Note: The BT1050 blowdown timer uses one switch only to indicate 'valve fully closed' or 'valve not fully closed' positions, and does not indicate that the valve has opened fully. A solenoid valve is required, which may be directly mounted to the NAMUR (VDI / VDE 3845) interface on the actuator.
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A suitable solenoid valve may be selected from the Spirax Sarco MV range. Alternatively, an air supply may be connected directly to the actuator port 'A' ( ¼ " BSP), where it is necessary to install the solenoid valve remote from the actuator. A standard ¼ " BSP 3-way solenoid valve may also be used. 3-port / 2-way NAMUR mounting solenoid types: MV11 - 230 Vac, MV12 - 110 Vac, MV13 - 24 Vac, MV14 - 24 Vdc The ABV21i and ABV40i must be installed with the flow in the direction of the arrow on the body. Principal features:
LSB31 switch box
- Automatic timed blowdown minimises wasted heat. - Suitable for boiler pressures up to 17.25 bar g.
- Spring return for fail-safe operation. - Pneumatic actuator for fast response. Standards These products comply with the requirements of the European Pressure Equipment Directive 2014/68/EU and carries the mark when so required. ISO mounting in accordance with ISO 5211. Antistatic device complying with ISO 7121 and BS 5351. Certification These products are available with certififcation to EN 10204 3.1. Note: All certification / inspection requirements must be stated at the time of order placement.
Port 'A'
NAMUR mounting holes
Sizes and pipe connections DN25, DN32, DN40, DN50 and DN65 Flanged PN40 (F4), PN40 (BS) or ASME B 16.5 Class 300. Available flange options: Flange Face-to-face
Flange thickness
PN40 (F4)
DIN 3002 F4
EN 1092 Part 1
PN40 (BS)
BS 2080
EN 1092 Part 1
ASME 300
ASME B 16.10
ASME B 16.5
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