FEATURES AND BENEFITS

• Installation in straight, vertical or horizontal pipe.
• Minimal headroom is required for mounting the unit in line.
• Only standard connections are involved for all sizes- 1-inch (NW 25) water; 3-inch (NW 80) steam.
• Few components are required.
• No atomizing steam or pipelines, which complicate installation are required.
• Only 15 feet of straight run piping down stream.

Precise Control of Temperature

• Rapid evaporation of water is achieved to minimize the accumulation of water in the line.
• Control within 10F (6C) of saturation is possible.
• Repeatable accuracy to ?1% of the range of the temperature controller.
• Water turndown capacity of 300:1 or higher.

Low Maintenance

• Chrome moly body with stainless steel internals eliminates corrosion problems.
• Hardened stainless steel nozzles minimize water.
• Stellite seat for long life tight shut-off.

Adaptable to Changing Needs

• Spray cylinders unscrew from probe for easy capacity changes without changing stem/disc or seat.
• Long trim life. Pressure drop is taken

1. Stem and Disc Assembly
2. Spray Cylinder
3. Spray Nozzles
4. Seat

For precise and economical control of steam temperature, the Yarway probe-type Templow desuperheater automatically introduces cooling water into steam flow in response to a pneumatic or electric control signal.

The Yarway desuperheater represents a major advance in the design of this type of equipment. It has an unusually high turndown ratio- double that of units previously available. This permits its use in steam flow rate.

Small enough to mount through a 3-inch (NW 80) flange in the steam line, it includes features previously found only in larger, more space-consuming desuperheater units. Water pressure 50 to 1600 psi (3.4 to 110 bar) above steam pressure is employed to generate thin-film, conical sprays which are injected into the steam flow through a series of vortex spray nozzles. The fine sprays evaporate rapidly in the steam, thereby minimizing the tendency for spray water to accumulate in the line. A separate water control valve is unnecessary because water flow control is a function of the desuperheater itself.

How it Works
Desuperheating water, at a pressure of at least 50 psi above steam line pressure, enters the desuperheater through a 1" (NW25) flanged water connection. The water flows down through the water jacket to the seating area above the disc, where tight water shut-off is achieved. When a reduction in steam temperature is signaled by the steam temperature control system, the actuator forces the steam/disc assembly of the desuperheater downward, progressively uncovering a series of seven water inlet orifices which feed each vortex nozzle. As more desuperheating water is required, the disc moves further downward, bringing additional nozzles into service.

There are seven stages of water control to each nozzle, plus six to 21 vortex nozzles, which create a rotating mist of water droplets for rapid evaporation and fast response to a change in temperature control signal.

Maximum water pressure is assured at the nozzles because no upstream water control valve is utilized. This also eliminates flashing/cavitation within the probe. Water flow is thus controlled at the point of injection into the steam.