Why do PU and FKM UN Piston Seals from NQKSF Make the Difference

Number of hits：102025-08-07 11:31:41　

PU and FKM seals… yeah, out in field they matter. I’ve seen rubber fail fast under acidic fluid—switching to PU seemed right. Then FKM pops up when things get hotter or more chemical-heavy.

There was one press line with fluctuations: -20 °C in morning, pushing 200 °C at runtime. Standard seals got brittle. NQKSF U‑shaped piston seal? Held tight. Oil pressure rises—seal squeezes better. Simple.

In a drilling rig project? Dust, oil, vibration… old seals failing weekly. PU version lasted months. No surprises after the swap.

Chemical mixing pumps using FKM—no leaks even under aggressive solvent exposure. Stock was ready, off-the-shelf. An old machine with odd groove size? They did quick custom—just a tweak. We tested, fit good.

UN type seals live inside cylinders, gearboxes, motors, robotic arms, even wind‑tracking actuators. Wherever fluid pressure meets motion. And downtime kills—so reliable seal less breakdowns.

We ask: what’s temperature range? They say –20 to 250 °C. That seems wide but matches what we saw. Pressure? Self-tightening seal under oil pressure, no extra spacers. Wear resistance? Better over months than rubber. Cost-wise: fewer replacements mean lower overall cost, even if PU piece costs a bit more upfront.

Support-wise—NQKSF 30 years history, overseas supply chain, stock in common sizes like O‑rings & oil seals. That matters when client calls “I need parts today”—we ship fast.

My note: seals small but system critical. Pick wrong, machine failure. Pick right—say FKM or PU, backed by supplier who knows hydraulics.

If you’re tired of replacing seals more than you should, or dealing with tiny leaks that turn into big downtime, take a look at what NQKSF is UN piston seal.