The PPY‑type special seal for rotary joint is a professional dynamic sealing component purpose‑built for hydraulic rotary unions and central swivel joints. Produced from high‑performance polyurethane compound, this rotary‑joint‑exclusive seal combines excellent wear resistance, low‑friction characteristics and strong anti‑extrusion capacity, performing reliably under continuous rotation, swing and fluctuating pressure conditions.
With precision‑calibrated sealing geometry, the PPY‑type special seal maintains steady contact pressure between rotating shaft and static housing. It efficiently inhibits hydraulic oil leakage across rotary interfaces, prevents system pressure loss and medium contamination. Its improved lip design controls frictional heat build‑up during long‑duration rotary operation, slowing down material ageing and deformation under cyclic working loads. It holds great compatibility with common mineral hydraulic oils used in mobile machinery.
Matching standard groove dimensions of rotary joints, PPY‑type seal enables fast installation and direct spare‑part replacement. It is extensively used on excavator central swivel joints, engineering machinery, material‑handling devices and various rotary hydraulic transmission assemblies. Adopting the PPY‑type special seal helps minimize internal leakage, reduce part abrasion, lower maintenance frequency and greatly improve operational stability for your heavy‑duty rotary hydraulic systems.
Original text from: Hydraulic and Pneumatic Seals https://www.bszzseal.com/
