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  • w94-heating-400x400
  • W94-actuator-400x400
  • Heating-Valve-Body-A-400x400
Technical Specification
  
ApplicationHeating
ServiceSteam, Liquids
Size1/2"
ConnectionNPT
Dimension(A) 4.125", (C) 2.12"
Valve ActionNormally Open
Valve TypeSingle Seat
Actuator TypeIndicating
Full Temperature Range200 - 280°F (93 - 138°C)
Working Temperature Range245 - 275°F
Capillary Length8 Feet
Material Specification
  
Valve BodyStainless Steel
Stuffing BoxBrass
Trim MaterialStainless Steel
Sensing BulbCopper
Union HubBrass
W94-10-08S15-HW12N
QTY :
Product Overview
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.
Features
• Self-Operating (no external power source required)
• Temperature Indicating & Non-Indicating models available
• Heavy Duty Die-Cast Aluminum Housing
• 1/2" thru 4" Valve Sizes
• Fully Enclosed Bellows
• Temperature Over-range protection spring to protect thermal system
How It Works
The W91/W94 Temperature Regulator is a fully self-contained unit requiring no external power source (i.e., compressed air or electricity). Regulation takes place when the sensing element (bulb) of the thermal system is exposed to changes in temperature. 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. 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).
Selection / Sizing / Capacities
Actuator Selection: The recommended working span for W91 & W94 Actuators typically falls within the upper third of the nominal range. Single-Seat In-To-Close, all Double-Seat, and all 3-Way valves have a recommended working span in this part of the nominal range. Using the valve in the recommended working span improves temperature response time of the system.




When Heat Load or Heat Transfer Rate (E) is Known Capacity of Steam Required(lbs/hr) =     E _(btu/hr)
 1000
When Square Feet Equivalent Direct Radiation (EDR) is Known Capacity of Steam Required(lbs/hr) = Sq. ft. of EDR
          4
When Heating Water with Steam Capacity of Steam Required(lbs/hr) = GPM x Temp Rise (°F)
   2
When Heating Fuel Oil with Steam Capacity of Steam Required(lbs/hr) = GPM x Temp Rise (°F)
   4
When Heating Air with Steam Coils Capacity of Steam Required(lbs/hr) = CFM x Temp Rise (°F)
 900
Dimension and Weights