Description
Product Overview
Spirax Sarco FTGS14 main valve assembly with float is a factory replacement kit designed specifically for Spirax Sarco FTGS14 ball float steam traps in pipe sizes DN15 (½”), DN20 (¾”), and DN25 (1”). It installs inside the trap body to restore modulating condensate drainage and positive shut-off against live steam when internal orifices or linkage mechanisms experience operational wear.
Because the host FTGS14 trap allows in-line servicing without disturbing connected pipework, installing this sub-assembly renews the core mechanical discharge system while reusing the existing austenitic stainless steel body and nickel-plated SG iron cover.
Key Features
- Factory-matched assembly containing valve seat (item 5), seat gasket (item 6), pivot frame assembly screws (item 7, 2 off), ball float and lever (item 8), pivot frame (item 10), pivot pin (item 11), cover gasket (item 3), and valve spring (item 28 for DN25 / 1” models).
- All working components constructed from stainless steel to withstand abrasive condensate and line velocities.
- Includes a reinforced exfoliated graphite cover gasket with an internal stainless steel support ring to re-seal the main body joint upon maintenance completion.
- Calibrated configurations matching maximum differential pressure ratings of 4.5 bar (FTGS14-4.5), 10 bar (FTGS14-10), and 14 bar (FTGS14-14).
Technical Specifications
| Specification / Component | Details / Material |
|---|---|
| Host Trap Models | Spirax Sarco FTGS14, FT14, FT43, FTGS14HC, FT14HC, FTGS14-C, FTGS14 (R-L), FTGS14 (L-R), FTGS14V |
| Host Nominal Sizes | DN15 (½”), DN20 (¾”), DN25 (1”) |
| Maximum Differential Pressure (ΔPMX) | 4.5 bar (FTGS14-4.5), 10 bar (FTGS14-10), 14 bar (FTGS14-14) |
| Valve Seat (Item 5) Material | Stainless steel |
| Valve Seat Gasket (Item 6) Material | Stainless steel |
| Pivot Frame Assembly Screws (Item 7) | Stainless steel (M4 x 6 Pozidrive, 2 off) |
| Ball Float and Lever (Item 8) Material | Stainless steel |
| Pivot Frame (Item 10) Material | Stainless steel |
| Pivot Pin (Item 11) Material | Stainless steel |
| Valve Spring (Item 28, DN25 / 1” only) | Stainless steel |
| Cover Gasket (Item 3) Material | Reinforced exfoliated graphite |
| Valve Seat Tightening Torque | 50 N m to 55 N m (37 lbf ft to 40 lbf ft) |
| Assembly Set Screws Tightening Torque | 2.5 N m to 3.0 N m (1.8 lbf ft to 2.2 lbf ft) |
| Cover Bolts Tightening Torque | 47 N m to 50 N m (35 lbf ft to 37 lbf ft, 17 mm A/F M10 x 30) |
Applications
- Scheduled overhaul and routine refurbishing of Spirax Sarco FTGS14 series ball float steam traps.
- Remediation of steam leakage resulting from wire-drawing, erosion, or debris impingement on the main discharge orifice.
- Replacement of mechanical float linkages damaged by system waterhammer or mechanical vibration.
- Pressure-range conversion between 4.5 bar, 10 bar, and 14 bar internal orifice limits on compatible DN15 to DN25 trap bodies.
Installation and Maintenance Procedures
Fitting the Main Valve Assembly
- Ensure the steam trap is isolated from both supply and return pipelines, depressurized to atmospheric conditions, and allowed to cool to ambient temperature.
- Undo the four cover bolts (item 2) using a 17 mm A/F spanner and lift off the body (item 1). Note that minimum withdrawal distance to remove the cover is 105 mm for DN15/DN20 or 120 mm for DN25.
- Remove the existing float assembly (items 7, 8, 10, and 11) by undoing the two M4 x 6 assembly set screws (item 7).
- Unscrew and remove the main valve seat (item 5) using a 17 mm A/F tool. Discard the old seat gasket (item 6).
- Thread the new valve seat (item 5) with its new stainless steel gasket (item 6) into the body and tighten to 50–55 N m.
- For DN25 (1”) traps, fit the valve spring (item 28).
- Secure the complete new float assembly to the body using the two assembly set screws (item 7), tightening them to 2.5–3.0 N m.
- Clean all joint faces. Fit a new cover gasket (item 3) and reassemble the body, tightening the cover bolts (item 2) evenly to 47–50 N m.
Ordering Spare Parts
Always specify the exact spare part description, nominal trap diameter, trap model, and maximum differential pressure rating when ordering. Example: 1 off Main valve assembly for a Spirax Sarco ½” FTGS14-10 ball float steam trap.