PISTON SEAL PSU

DESCRIPTION

The PSU piston Uniring is a dual durometer, one piece double-acting piston seal. It consists of a dynamic sealing and wear lamina bonded to a static sealing and activation lamina. The material used for the static lamina has high resilience and extremely low compression set. It functions as a seal energizing spring element and assures positive sealing performance throughout a broad pressure range. The dynamic sealing element is made of a harder material, selected for it’s high abrasion resistant qualities. 

The PSU can readily be substituted in existing grooves to replace other types of double-acting seals, such as PTFE piston rings and T-seals. 

SEAL INFORMATION

Material Type (Primary Seal): POLYURETHANE 

Material Type (Energizer): 57A POLYURETHANE 

Durometer (Shore D): 60 

Temperature Range (F): -40 TO 195 

Extrusion Gap at Various Pressures (in):

• 1,500 PSI: 0.040
• 3,000 PSI: 0.016
• 5,000 PSI: 0.008

Max Speed (ft/sec): 3.0 

Mating Surface Roughness - Ra (µin) - DYNAMIC: 4<>16 

Mating Surface Roughness - Ra (µin) - STATIC: 32 MAX 

Part Number Definition (Inch): PSU-(OD)X(ID)X(HT)