401551 Hoffman 17C-V 2-25 Vertical 1/2" Thermostatic Steam Trap

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401551 Hoffman 17C-V 2-25 Vertical 1/2" Thermostatic Steam Trap.


Thermostatic Steam Traps:

Thermostatic steam traps reduce start-up times and improve overall efficiency. Balanced Pressure Thermostatic Traps use a special bellows diaphragm. The diaphragm is designed to open in response to pressure and temperature to discharge air and condensate, and to close against passage of steam. The temperature at which a Thermostatic Trap opens is variable, but is 10° to 30°F below saturated steam temperature for the existing pressure. This type of trap is small, simple in construction, size and weight, and has adequate capacity for various applications, especially in low-pressure heating systems.

Operation of Thermostatic Traps:

Thermostatic traps are normally open allowing fast venting of air during start-up. During start-up, cold condensate drains through the trap. As temperatures reach 10° to 30°F of saturation, the thermostatic bellows element closes the trap. During operation, thermostatic traps find an equilibrium point to drain condensate approximately 10° to 30°F below saturation at continuous flow.

Characteristics of Thermostatic Traps:

  • Sub-cools condensate usually 10° to 30°F.
  • Normally open at start-up to provide fast air venting.
  • Follows steam saturation curve to operate over wide range of conditions.
  • Self-draining.
  • Energy efficient.
  • Fast response to changing conditions.
  • Fail mode is open.
  • Water hammer can damage bellows.
  • Superheat can damage bellows if it exceeds trap temperature rating.
  • Cooling leg required in some applications.

Primary Applications of Thermostatic Traps:

  • Radiators, convectors, unit heaters.
  • Cooking kettles.
  • Sterilizers.
  • Heating coils.
  • Tracer lines.
  • Evaporators.

Features and Benefits:

  • Brass bodies provide resistance to moderate water hammer and chemical attack.
  • Stainless steel Dura-Statâ modules are easily replaced without disturbing piping connections.
  • Compact size reduces installation space requirements.
  • Inexpensive purchase price.
  • Range of seat pressures available – up to 125 psig.


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Warranty Information

Warranty: Quoted prices include standard factory warranties. Warranty requires install, start-up and operation as per the manufacturers IOM. Job Site Assistance: By Others Start-Up: By Others Commissioning: By Others: These services, if a project requires start up, they are responsibility of contractor or commissioning agent. Owner training assistance, as outlined in any equipment specifications the responsible of the commissioning agent. Clarifications & Exclusions 'ALTERNATES' are offered for consideration and will always be subject to the engineer's and owners approval. Excludes any seismic calculations or supports, coatings other than factory standard. Terms: prices are quoted are "each" (unless stated otherwise) and FOB point of origin with no freight allowed freight ships via common ground carrier, and inside continental US Only - any special shipping requirements to be responsibility of purchaser. We offer all prices less tax, with a validity of 30 days from the date quoted and all sales are final. Once items have shipped and left the warehouse National Pump Supply is not responsible for any damage caused during the shipping process. You must contact the shipper directly and file a claim with the shipping company. Lead Time: All prices offered are based on standard factory lead times (or) as stated within quotation. Expedited shipments may be available at an additional charge. Contact your Sales Engineer for the ETA of any specific equipment on any order or quotation.
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