Description
Rebuilding a Techcon spool valve starts with fresh dispensing valve parts, and this kit supplies the seal and expander O-ring a worn valve needs to seat properly again. The TSD400-56 seal is built from PTFE for chemical resistance and dimensional stability under repeated cycling, paired with an EPR expander O-ring that maintains contact pressure against the valve bore.
Where Dispensing Valve Parts Like This Kit Get Used
Techcon spool valves see duty in precision dispensing lines for adhesives, greases, and other viscous fluids on assembly benches and automated dispensing cells. Over thousands of cycles, the seal and O-ring wear first, well before the valve body or piston. Swapping in a rebuild kit at the first sign of drip-through or inconsistent shot size restores the valve’s seal without replacing the whole unit.
How These Dispensing Valve Parts Hold Up
PTFE resists swelling from solvents and most adhesive chemistries, so the seal keeps its shape instead of deforming under the O-ring’s expansion force. The EPR expander compresses the PTFE seal lip against the bore wall, and that combination is standard across Techcon’s spool valve line for a reason: PTFE alone can lose contact pressure over time, and the EPR expander compensates for that relaxation. On lines running multiple valves per shift, tracking seal age alongside cycle counts helps predict which valve needs the next rebuild before a drip shows up mid-run.
| Attribute | Detail |
|---|---|
| Seal material | PTFE |
| Expander | EPR O-ring |
| Compatible with | Techcon spool-style dispensing valves |
| Kit contents | Seal plus expander O-ring |
Order this kit when a spool valve starts dripping between cycles or when shot volume drifts from the calibrated setting. Keep a spare kit on the bench for valves running multiple shifts, since seal wear tracks cycle count more closely than calendar time. For dispensing systems, mixers, and nozzle accessories across the line, see our dispensing, mixing, and nozzle accessories category. Techcon documents the full spool valve service line on its manufacturer site.
Need Help?
Need help matching a seal kit to your specific Techcon valve model? Call (800) 220-1966 or email [email protected].
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