Class 3

Class 3, High Pressure, NFPA Hydraulic Cylinder is available as large as a 20" bore with over 20 mounting styles. The Class 3 is also available in an oversized, Mill Cylinder.


Available in: Hydraulic
  • Improved Cushion Adjustment: Newly designed needle valve is interchangeable with current design and offers improved sealing characteristics.

    Cushion Adjustment Needle: Needle valves and ball check drilling and machining are identical, making location of these functions interchangeable.

    Tube Seal: Two-Step Pilot Recess Grooves afford Positive Controlled Squeeze on Pressure Sealed O-Ring, while Tubing locates concentrically against End Cap.

    Piston: High strength, fine grain cast iron piston fitted with split “Tongue-seal” cast iron piston rings on either side of a homogenous “T” ring supplied with back-up rings. “T” ring furnished on all models; oversized are fitted with piston rings. The outboard piston rings effectively seal off initial shock loads and allow the “T” ring to provide a leak-proof piston seal with maximum life.

    Heavy Wall: Steel tubing, precision honed with extra-long stones to provide over-lap and eliminate a spiral condition detrimental to long stroke cylinders. The resulting ultra-smooth finish provides maximum seal life.

    Cushion Sleeves: Precision fitted with predetermined taper to provide a gradual deceleration and reduce shock.

    Tie Rod: Material stressproof steel for maximum strength. Multiple tie rods in each corner are furnished on all models, 10” thru 20” diameter bores.

    Piston Rod: High tensile 100,000PSI minimum yield stressproof steel, ground, polished, and flash chrome plated .0003/.0005 to provide a hard, long-wearing surface with low friction, but not corrosion resistant. Consult factory for special applications.

    Rod Packing: Choice of self-adjusting to pressure, multi-lip split seal or continuous pre-loaded lip seal.

    Packing Gland: Readily removable long bearing type. Rod packing easily replaced without loosening tie rods or dismantling cylinder.

    Rod Wiper: Wipes rod clean and dry. Keeps foreign matter from entering cylinder, extending packing life.

    Rod End Threading: Choice of standard catalog male and female thread types plus standard wrench flats.

    Cushion Ball Check: Assures quick starting under full power; pressure acts on full piston area instantaneously.

    End Caps: (Cylinder Heads) Precision Broached Steel Blocks


    Options

    • Cast iron automotive type pistons optional
    • Stop Tubes
    • Oversized Rods
    • Double Rod End
    • Cushions
    • Piston Rod Extension
    • Rod Threading
    • Cylinder Ports
    • Water Cylinders can be engineered
  • Model C

    NFPA STD. MF2
    Flange Mount


    Model CC

    NFPA STD. MF6
    Flange Mount


    Model D

    NFPA STD. MF1
    Flange Mount


    Model DD

    NFPA STD. MF5
    Flange Mount




    Model G

    NFPA STD. ME5
    Rod Head and Blind Head Rectangular Mount


    Model J

    NFPA STD. ME6
    Rod Head and Blind Head Rectangular Mount


    Model A

    NFPA STD. MS2
    Side and Lug Mount


    Model B

    NFPA STD. MS3
    Side and Lug Mount


    Model S

    NFPA STD. MS4
    Side and Lug Mount


    Model AL

    NFPA STD. MS7
    End Lug Mount


    Model E

    NFPA STD. MP1
    Clevis Mount


    Model HE

    NFPA STD. MP2
    Clevis Mount


    Model E3

    NFPA STD. MP3
    Fixed Eye Mount


    Model EU3

    NFPA STD. MPU3
    Spherical Eye Mount


    Model F

    NFPA STD. MT4
    Trunnion Mount


    Model FB

    NFPA STD. MT2
    Trunnion Mount


    Model FR

    (NFPA STD. MT1
    Trunnion Mount


    Model T

    NFPA STD. MX1
    Tie Rod Mount


    Model TB

    NFPA STD. MX2
    Tie Rod Mount


    Model TR

    NFPA STD. MX3
    Tie Rod Mount




    The NOPAK Class 3 Mill Type Cylinder offers the advantages of field-proven Class 3 design integrity in a non tie rod unit. All features found in the other Class 3 models are incorporated into the Mill Series.







  • Easily mounted in cylinder heads to confirm the position of the piston. The switch senses cushion sleeves position at the end of stroke. Being totally self contained, the switch will not be contaminated.


    No contact design, has both analog and digital outputs available. Feedback sensor is protected from debris and mechanical damage.


  • Rod Seal Kit

    The Rod Seal Kit includes 1 V-Ring Rod Packing, 1 Rod Wiper, and 1 Wave Spring.


    Piston Seal Kit

    The Piston Seal Kit includes 2 Tube O-Rings, 1 G. T. Ring (Piston Seal), and 1 Piston O-Ring.


    Packing Glands

    Replacement Packing Glands are available for all models.


  • Class 3 Catalog Section

    Nopak Full Product Line Catalog (Literature: PDF)

  • Have questions about the Class 3? Send us a note and we'll get back to you as soon as possible!