Temperature Regulators for Heating
Watson McDaniel Steam Products

Temperature Regulators for Heating with Liquid

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The W91 & W94 Self-Operating Temperature Regulators are the preferred choice of original equipment manufacturers, mechanical contractors and specifying engineers. They require no external power source and are ideal for regulating the temperature of tanks, process streams and various types of industrial equipment. The Actuator is noted for its rugged die-cast aluminum housing, fully-enclosed bellows assembly and internal over-temperature range protection.

Model W91 Non-Indicating (without indicating dial) features a lower profile and should be specified where space constraints may be an issue.
Model W94 Temperature Indicating (with indicating dial) will allow the operator to verify the process temperature and to aid in temperature adjustment.

Catalog Specification Sheet

I&M

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Description

The Temperature Regulators for Heating with Liquid are fully self-contained unit requiring no external power source (i.e., compressed air or electricity).

How It Works:

  1. Regulation takes place when the sensing element (bulb) of the thermal system is exposed to changes in temperature
  2. The thermal system is charged with a predetermined amount of vapor fill, which, when heated, will cause the bellows within the unit’s actuator housing to expand
  3. The valve action is either In-To-Close for Heating or In-To-Open for Cooling

Normally Open Valves are used for HEATING, so the valve stem closes (in-to-close) as the control signal (temperature) increases.

Single-Seated Balanced Valves are used for Heating Applications (normally steam) where tighter shut-off is required. Leakage rate is approximately 0.01% of the maximum capacity (Class IV shut-off).

Application Data Sheet – Fill Out and Return for Accurate Quote