In temperature-sensitive process steam systems, heat exchangers, reboilers, unit heaters, and jacketed vessels, continuous condensate evacuation without steam loss is essential for maintaining process temperature stability and preventing water hammer. Mechanical ball float steam traps respond modulatingly to varying condensate loads, discharging liquid immediately as it forms at steam temperature.
The Forbes Marshall FT14 Single Orifice Float Trap (Cast Iron Model SOFT31) is a high-efficiency mechanical float trap engineered for industrial process heating and steam distribution lines. Featuring a heavy-duty cast iron body (FG 260), a precision stainless steel ball float lever assembly, an integral automatic thermostatic air vent (AV), and a single orifice valve mechanism, the FT14 (SOFT31) delivers reliable continuous condensate drainage with zero live steam loss.
The Forbes Marshall FT14 / SOFT31 Steam Trap features a dual-chamber cast iron housing containing an internal stainless steel float mechanism and a thermostatic air venting capsule.

The trap operates based on the density differential between steam and condensate. As condensate flows into the trap body, the sealed stainless steel ball float rises, modulating the single orifice main valve off its seat in direct proportion to the condensate inflow rate. During plant startup, cold air and non-condensable gases are automatically purged through the open thermostatic air vent capsule. As steam reaches the capsule, it expands and snaps shut, preventing steam loss during operation.
The engineering parameters for the Forbes Marshall FT14 Single Orifice Float Trap (Model SOFT31) are detailed below:
|
Technical Parameter |
Specification Detail |
|
Product Brand |
Forbes Marshall / Spirax Marshall |
|
Model Code |
FT14 (Commercial Series) / SOFT31 (Single Orifice Float Trap Cast Iron Series) |
|
Trap Type |
Mechanical Ball Float Trap with Automatic Air Vent (AV) |
|
Nominal Sizes |
1/2" (15 NB), 3/4" (20 NB), and 1" (25 NB) |
|
Differential Pressure Ratings |
FT14-4.5 (4.5 bar ΔP), FT14-10 (10 bar ΔP), FT14-14 (14 bar ΔP) |
|
Max. Operating Pressure (PMO) |
Up to 14 bar g |
|
Max. Operating Temperature (TMO) |
Up to 220°C |
|
Body Metallurgy |
Cast Iron (IS 210 FG 260 / ASTM A126 Cl B) |
|
Float & Lever Internals |
Stainless Steel (AISI 304 / AISI 316) |
|
Air Vent Capsule |
Stainless Steel Thermostatic Element (Balanced Pressure Capsule) |
|
End Connections |
Screwed BSP / NPT Female Threads or Flanged (BS 4504 / ASME B16.5) |
|
Flow Orientation |
Horizontal Inline Flow (Left to Right / Right to Left) or Vertical Flow |
|
Applicable Standards |
ISO 6552 / BS 6759 / ASME B16.34 |
|
Testing Standards |
ISO 6938 / API 598 |
The continuous drainage characteristics and air venting capability of the Forbes Marshall FT14 / SOFT31 Float Trap make it suitable for process heating equipment:
Pharma manufacturing facilities, chemical processing complexes, textile mills, and food processing plants across Gujarat—including industrial corridors in Vadodara, Ankleshwar, Bharuch (Dahej PCPIR), Surat, Vapi, Changodar, Sanand, and Ahmedabad—rely on authentic ball float steam traps for process heating reliability. Sourcing through an authorized Forbes Marshall valve dealer in Ahmedabad ensures genuine product supply with manufacturer test certificates and accurate technical support.
Key industrial regions with high demand for Forbes Marshall FT14 and SOFT31 float traps include:
Partnering with an established Forbes Marshall supplier in Gujarat provides access to ready local stock, technical valve selection assistance, and competitive project rates.
When procuring Forbes Marshall, Spirax Marshall, and L&T process steam hardware like the FT14 / SOFT31 Float Trap, FT10P, FMTD64, TD55, or TD120M, Awal Valve is your premier industrial supply partner across Gujarat.
Why partner with Awal Valve:
The Forbes Marshall FT14 Single Orifice Float Trap (Cast Iron Model SOFT31) provides a robust, continuous, and efficient condensate drainage solution for industrial steam process applications. Featuring a cast iron FG 260 body, stainless steel internal float mechanism, automatic thermostatic air vent, and modulating discharge capability, the FT14 (SOFT31) ensures maximum process heat transfer, rapid warm-up, and long-term energy efficiency.
For technical datasheets, capacity curves, or immediate price quotations in Gujarat, contact Awal Valve—your trusted supplier for Forbes Marshall steam equipment and industrial process valves.
Q1: What does the "SOFT31" designation signify in Forbes Marshall float traps?
A: "SOFT" stands for Single Orifice Float Trap, and "31" designates the cast iron design family series engineered for industrial process steam applications up to 14 bar g.
Q2: Why is the FT14 float trap preferred over a thermodynamic trap for process heat exchangers?
A: The FT14 ball float trap discharges condensate continuously as it forms at steam temperature, preventing liquid backing up into heat exchanger tubes and ensuring uniform temperature control.
Q3: What differential pressure options are available for the FT14 / SOFT31 model?
A: The FT14 / SOFT31 is available in three differential pressure options: FT14-4.5 (4.5 bar max ΔP), FT14-10 (10 bar max ΔP), and FT14-14 (14 bar max ΔP) to suit specific line pressure requirements.
Q4: How can I buy authentic Forbes Marshall FT14 / SOFT31 float traps in Gujarat?
A: You can source authentic Forbes Marshall FT14 float traps directly through Awal Valve, an experienced industrial valve dealer in Ahmedabad supplying genuine products with official test certificates across Gujarat.
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