There are four types of steam control valves available
for use on a steam fired storage water heater. |
Self Operating
|
| The valve design includes a bulb and capillary assembly charged
with a thermally responsive vapor. The expansion/contraction
of the vapor acts upon the valve bellows in order to control
the flow of steam through the valve. No external power source
is required for operation. |
|
Pilot Operated
|
| A pilot operated control valve is the most widely used type
of valve for standard water heating applications. In this type
of valve, a temperature pilot device utilizes steam to operate
the main valve. No external power source is required other
than steam. This is a highly dependable temperature control
system which is suitable for most applications. As an option,
this valve may include a pressure reducing pilot which limits
the steam pressure to a predetermined maximum. |
|
Self Operating
|
| The valve design includes a bulb and capillary assembly charged
with a thermally responsive vapor. The expansion/contraction
of the vapor acts upon the valve bellows in order to control
the flow of steam through the valve. No external power source
is required for operation. |
|
Electronic Operated
|
| This control valve is similar to a pneumatically operated
system, except in this case the temperature controller is a
sophisticated digital display electronic device which outputs
a 4-20ma signal to a compact motor mounted on the steam control
valve in order to proportionally control the flow of steam
to the heating coil. The temperature controller displays set
point as well as actual water temperature and is available
with an RS485 communications port for remote control. |
|
