A leak-tight seat, restored
Passing manual valves waste product and put isolation at risk. We machine and refinish seats and discs back to a precise sealing surface — on-site or in the workshop — then leak-test and reseat every valve to confirm a tight shut-off.
* Gate, globe, ball, check and butterfly valves, from ¼" up to 24" — handwheel-operated or actuated (on-off).
Seat & disc lapping in action
Check valve — seat lapping in progress
Gate valve — on-site seat refinishing
Gate valve — disc lapping on the machine
Precision sealing-surface capability
Portable refinishing tools
We use VENTIL portable machines to refinish seats in place — often without removing the valve from the line.
All valve types
Gate, globe, ball, check and butterfly valves from ¼" to 24", manual or actuated — a single partner for your whole isolation fleet.
Leak-tested & reseated
Every valve is pressure leak-tested and reseated after refinishing to confirm a verified, tight shut-off.
Overhaul procedure
Inspect
Disassemble and inspect seat, disc, stem and body for wear, pitting and corrosion.
Refinish
Machine and refinish the seat and disc to restore a flat, precise sealing surface.
Reassemble
Replace packing, gaskets and worn parts, then reassemble with correct torque and stem alignment.
Leak test
Hydrostatic seat and shell leak test to confirm tight shut-off, with a documented result per valve.
Valves we overhaul
| Valve types | Gate, globe, ball, check, butterfly |
|---|---|
| Size range | ¼" – 24" |
| Tooling | Portable seat refinishing |
| Location | On-site or workshop |
Send the valve tag, type and size and we'll advise whether on-site service or workshop overhaul suits best.
Reliable isolation
A refinished, reseated valve holds a tight shut-off — protecting product, enabling safe isolation for maintenance, and extending service life without a costly replacement.
Actuated? We service the whole package
An on-off valve is the same body with an actuator on top — so we overhaul both as one unit. The valve gets the same seat refinishing and API 598 testing; the actuator gets a full strip-down of its own: cylinder seals and diaphragms renewed, solenoid and limit switches checked, air lines cleaned and leak-tested.
Tested to API 598, not just reassembled
After repair, every valve is shell-tested at 1.5× rated pressure with a size-based holding time, then seat-tested at 1.1× — hydrostatic tests pass only with zero visible leakage, while pneumatic tests are measured in bubbles per minute against the API 598 table. A functional test of operation and torque closes the job.
* For actuated valves, full open/close cycles are run through the actuator before release.
| Shell test | 1.5 × rated pressure |
|---|---|
| Holding time | 15 s (≤2") – 180 s (≥20") |
| Seat test | 1.1 × rated pressure |
| Hydrostatic acceptance | zero visible leakage |
| Pneumatic acceptance | bubbles / min per API 598 |
Manual & on-off valve gallery
