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Fisher Yarway AT-18/28 and AT-38/48 Desuperheaters

Any questions?

Slawka Pedersen
Inside Sales Manager
Phone. 2137 7702

Emerson Fisher™ Yarway™ AT-38/48 for standard duty and AT-18/28 for heavy duty.

The 38/48 is a mechanically atomized insertion type with integrated water control through a pneumatic, electric or hydraulic actuator.

The AT-18/28 was specifically developed for use on medium/high pressure steam applications. The unit can also be used as a liquid into gas injector for which high grade alloy such as stainless steel is often used.

The fabricated construction makes them easily adaptable to meet various boiler codes and material specifications. The Yarway desuperheaters have a very wide range of nozzles and combinations to match the total control range.

Specifikationer
Funktioner

AT-38/48

Critical Service	Steam Condition
Valve Size Steam	DN 80 and DN 100 (NPS 3 and NPS 4)
Valve Size Water	DN 25, DN 40, DN 50 and DN 80 (NPS 1, NPS 1-1/2, NPS 2 and NPS 3)
Pressure Class	ASME / DIN

AT-18/28

Critical Service	Steam Condition
Flow Characteristics	Special Characterization, Modified Equal Percentage, Linear, Equal percentage
Material	Alloy
Operating Temperature	High Temperature
Pressure Class	PN, ASME
Shutoff Class	Class V (FCI 70-2)
Valve Size	NPS 1 / DN 25, NPS 1-1/2 / DN 40, NPS 2 / DN 50, NPS 4 / DN 100, NPS 3 / DN 80
Valve Size Standard	DN, NPS
Valve Type	Angle Valve

AT-38/48

The fabricated construction makes it easily adaptable to meet various boiler codes and material specifications.
The unit can also be used as a liquid into gas injector for which high grade alloy such as stainless steel is often used.
The valve stem is rolled to obtain a finish of Ra < 0.1 µ. This highly finished surface is then nitrided to give a hardness of > 1000 Vickers. The combination of these processes improves sealing tightness, while reducing packing friction.
Piston rings are specially hardened and subsequently nitrided and are provided with a special gas tight slot.
These rings offer excellent running properties and enable controllable Cv (Kv) values as low as 0.005 (0.0043).

AT-18/28

Forged construction
High quality stuffing box, containing no asbestos
Variable nozzle type
Wide range of Cv (Kv) capacities available
Special nozzle combinations available
Semi balanced internals for economic actuator selection

Brands

Fisher Yarway AT-18/28 and AT-38/48 Desuperheaters

Questions about the product?