Partlow Model 40 Gas Control

Taped for 1" pipe only, and intended for use on vertical pipelines, these valves are for temperature control on small or medium capacity gas-fired appliances at lower pressure. Heavy-walled die-cast aluminum body. Internal mechanisms are machined brass, and aluminum and zinc die-cast parts. Designed for stationary applications only. Eleven operating ranges covering -30ºF to 1100ºF.
Partlow Model 40 Gas Control
Quick Specifications
  • Taped for 1" pipe only, and intended for use on vertical pipelines, these valves are for temperature control on small or medium capacity gas-fired appliances at lower pressure.
  • Heavy-walled die-cast aluminum body. Internal mechanisms are machined brass, and aluminum and zinc die-cast parts.
  • Designed for stationary applications only.
  • Eleven operating ranges covering -30ºF to 1100ºF.
Read more for Mechanical Limits
  • Standard Features
  • Key Specifications
  • Agency Approvals
  • Manual
Overview / Design Principle:
Partlow's series of self-operating, throttling gas valves have been specified for a wide variety of applications for more than 60 years. They maintain critical temperatures in gas-fired appliances without the characteristics sawtooth curves fo two-position controls.

Self-operating Model 40 was designed for use in vertical pipelines to maintain throttling temperature control of small or medium capacity gas-fired appliances. Pipe size of 1" take 1 psi. Model 48 - 1/2" has a 5psi rating.
Operation:
Adjustment is made by turning the setting knob, which advances or retracts a fixed level fulcrum in larger models, or raises or lowers the valve seat of smaller instruments. The plunger of the thermal element bears directly on the short leg of the lever or control valve.

There is no power requirement.

In the thermal element, expanding and contracting wiht deviations from appliance set point, advances and retracts the element plunger. The valve is thus throttled to decrease or increase the fuel suppy to the burners, restoring control temperature at the bulb.

The throttling action leads to a state of balance in which the valve is held at just that position which permits a gas flow sufficient to maintain control temperature under existing appliance load conditions. As load conditions change, a new valve position is sought and maintained as soon as equilibrium is established under the new condition.

An adjustable needle-type by-pass regulates the gas flow around the valve to supply minimum flame, if required.

Made of heavy-wall die-cast aluminum; internal mechanisms are machined brass, aluminum and zinc die cast parts.

  • +/- 1% Accuracy
  • Maximum pressure: 65 psi
  • 1 Year warranty
  • None
 
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