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Adjustable Radiator and Main Line Vent Valves

for One Pipe Steam Systems

Laboratory Study:

The venting capacity of radiator air vents and main line air vents used

in single pipe steam heating systems has an important effect on the

operation of these systems. In order to obtain a better understanding

of these effects, the Center for Energy and Environment conducted

experiments both in laboratory and in the eld to investigate the

properties of single pipe steam air venting. Commercially available

radiator and main line air vents were tested and compared. Main

line air vents in one building were replaced with open pipe orices

of different sizes, and the resulting ll characteristics of the main

steam lines were observed. The purpose of the main line air vent is

to rapidly vent the relatively large amount of air in the main lines.

This allows the main line to ll more quickly and thus reduces

the time difference of steam arrival at the different risers. A large

orice allows the air to be pushed out as a lower back pressure. The

function of the radiator air vent is to provide a means for air to be

driven out of the radiator as steam enters. At a given pressure, the

ll time of a radiator varies proportional to its heat capacity and

inversely proportional to the venting capacity of the radiator air vent.

It is possible to control the speed at which a radiator will ll with

steam by installing a radiator air vent with a certain venting capacity.

Used in this manner, radiator air vents are helpful in evening out

the heat distribution in a building. The results show that the larger

the vent, the more quickly you can vent a system, which lowers

operating pressure requirements.

Achieve a More Balanced Steam Heating System with the Most

Advanced Air Valve Available.

• Exclusive Fingertip Adjustment: Simply sliding a lever allows you to adjust the venting rate.

• Each Radiator Has Its Own Venting Speed: In hard to heat areas, the radiator VARIVALVES

can be adjusted for

quicker venting. In overheated areas, the VARIVALVES

can be adjusted for slower venting. This allows steam to be

evenly distributed in the system.

• Long Term Fuel Savings: Because Heat-Timer VARIVALVES

vent more quickly, it takes less time to ll your

system with steam. By adjusting the venting to balance the system, there is no need to raise the steam pressure to

reach under heated areas. Shorter boiler runtimes and lower pressure results in fuel savings.

• Replace Valves with VARIVALVES

: Using Heat-Timer adjustable vent rate VARIVALVES

throughout the

system allows you to balance the heat to your requirements.

VARIVALVE

Summary of content (2 pages)

PAGE 1
Adjustable Radiator and Main Line Vent Valves for One Pipe Steam Systems VARIVALVE Laboratory Study: The venting capacity of radiator air vents and main line air vents used in single pipe steam heating systems has an important effect on the operation of these systems. In order to obtain a better understanding of these effects, the Center for Energy and Environment conducted experiments both in laboratory and in the field to investigate the properties of single pipe steam air venting.
PAGE 2
VARIVALVE ® Steam Radiator Vents It’s All in the Venting Phosphorus Bronze Bellows Large Variable Orifice • I nsures positive shutoff! Quiet operation! No clicking or hissing. • Outlasts bimetal air-vents. • A llows adjustment up to 5/16”. Makes radiators heat up FAST (when required). • Simplifies balancing of systems by providing the fastest heat for hard-toheat rooms and allowing reduction of heat to overheated areas • For low-pressure one pipe steam heating systems.