Epsilon Low Spill Coupling System

EPSILON® is a low spill coupling, based on a double ball valve system integrating a sophisticated safety design. Beyond the common advantages of a ball valve design, EPSILON® provides for product flow through an unrestricted flowpath and double shut-off reliability in the coupling connection.

The EPSILON® Coupling System is designed to prevent chemical spills and reduce fugitive emissions of Volatile Organic Compounds (VOCs), particularly in the process facility and during transfer to and from tank trucks and tank cars.

During in-plant chemical transfers, the EPSILON® Chemical Containment System will provide your Plant with process flexibility, while improving operator safety, enhancing environmental compliance and reducing overall capital expenditures and operating costs.

  • Features
  • Benefits
  • Ordering Guide
  • Tech
  • Options
  • Applications
  • Photos
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  • Available in ¾”, 1”, 1½”, 2” and 3”
  • Available in Stainless Steel and Hastelloy®
  • Available with end connections complying to ANSI and DIN standards.
  • FDA-compliant seal materials, TFM or PFA
    • Next generation PTFE with best combination of temperature ranging from -22°F (-30°C) to 450°F (230°C), sealing, and sliding characteristics.
  • Constructed to handle pressure of 435 psi (30 Bar) and temperatures up to 450°F (230°C)
  • Spring-energized TFM or PFA U-cup sealing 
    • A spring-energized stem and face and flange seal provide initial sealing. The spring supplies all the load required for sealing when the media pressure is too low to fully actuate the lips of the seal. Testing confirms the low spillage and emission specifications are still achieved after 2,000 cycles.
  • Polyurethane dust cap or Stainless Steel pressure cap 
    • Used to protect the ball from damage and debris when coupling is closed and disconnected.
  • Male and female lug and flange connection interfaces 
    • Ramped lug and flange interfaces are first aligned and then connected with a push, followed by a quarter (90°) turn. This “instant” connection method is done by hand without tools in order to create compression on the critical interface seal.
  • Independent and multi-level safety interlocks
    • EPSILON® technology involves five independent and redundant mechanical interlocks. They require deliberate sequential action by users, thereby eliminating unintentional spills and catastrophic chemical releases that threaten worker safety and the environment.
  • Approved/listed for pressure service through a comprehensive set of international agencies


  • Dry Disconnect Reliability – low spill face seal reduces amount of loss upon disconnect, specified to less than .40 ml spillage for the 2” coupling (2000 cycles test average 0.6 ml) and less than 1/10th of a teaspoon (half an eyedropper).
  • Enhanced Environmental Compliance – Positive shut-off of coupling halves eliminates line contamination and accidental release of potentially hazardous fluids into the environment during connection and disconnection. 
  • Full Flow – Straight-through flow path provides unrestricted flow in either direction, minimizing pressure drop. Unrestricted flow path provides less than 1psi pressure drop at 150 GPM.
    • A convex ball nests in a concave ball to virtually eliminate any cavity between the mating halves. The positive shutoff ball valves, and the absence of a cavity between them, minimize chemical loss when the coupling is disconnected. Each half is an independently operated, positive shut-off ball valve that is controlled by manually rotating the valve handles. The straight-through EPSILON® valve design also provides unrestricted, high flow in either direction and low pressure drop. All metal wetted components are 316 stainless steel or Hastelloy®.
  • Unparalleled Safety – Multiple safety interlocks eliminate unintentional spills and catastrophic chemical releases that threaten worker safety and the environment. EPSILON® safety interlocks force the valves to open and close only with a deliberate action, preventing accidental opening of the valve.
  • Prevents Cross-Contamination – Optional keyed couplings mechanically lock out and isolate transfer lines.
    • For extremely critical operations, EPSILON® offers the unique keyed interface which locks out and isolates transfer lines, preventing cross-contamination.
  • Easy Maintenance – EPSILON® was not only engineered for easy operations, but also for quick replacement of the transfer seal without any lockout. No special tools are required for replacement of seals.

Ordering Guide



  • Ultra Low Spill Face Seal
    • This seal reduces the amount of spillage at disconnect to .2 cc. This seal is not pressure assisted and should only be used for applications lower than 100 psi.
  • Cavity Filled
    • Designed to reduce the possibility of contamination by entrapment of process fluid in the void normally found behind the ball and the valve body. Ideal for applications where cross-contamination and cleanliness is a concern. Back side of the valve balls are bored for efficient cleaning.
  • Keyed Couplings
    • For extremely critical operations, EPSILON® offers the unique keyed interface which locks out and isolates transfer lines, preventing cross-contamination.
  • Dual Ball Race
  Dual Ball Race (Optional)
  • Radial swivel seal
    • Replaces dynamic face seal
    • Lower leak rate
    • Lower seal mortality rate caused by over-compressing seal to install bearings
  • Dual ball races with hardened stainless bearings
    • Replaces PTFE sleeve bearing that may become overloaded and allow greater axial misalignment causing the dynamic face seal to leak
    • Provides additional support for applications with long hose drops or high load requirements.
  • Spring energized dust seal 

  • Transportation Coupling System (TCS)
    TCS Fitting
    • Specially designed for railcar, truck, isotainer or tote equipment used in transporting chemicals safely. Contact us for more information.


The following is a listing of some of the applications/products That have successfully used Epsilon.

Chemical Application
ACN, BD, Latex  
Acrylamid Polymers, Flocculants   
Acrylates, Polymers, Solvents   
Acrylic acid, aliph. Amines, Dispersions, Nitrobenzene, Benzene, C4-Components, flammable Solvents, Steam, Acrylmonomers, Diphyl, Oleum, HBr, Chloroformic acid (Chlorameisensre.)   
Adhesives  In Plant 
aliphat. Amines   
Ammonia water   
Biodiesel  In Plant 
Butyrolactone, THF, Butanediole, BD, Methanol   
EO, PO   
Ethylene Oxide (EO)  Rail Car 
Fine Chemicals   
Fine Chemicals, Syltherm (Heat transfer Oil)   
Flavors, Fragrances   
Glues, Adhesives   
Hydrofluoric Acid   
Isocyanates, Xelene, n-Butylacetate   
Liquid Ammonia   
liquid Ammonia, Methylamines, ACN, EO   
liquid Cristals   
Methanol  Off Shore 
Paints, Dispersions, Isophtaloylchloride   
Paints, Resins, Glue   
Pharmaceutical Chemicals, Dichloromethane, Toluene, Solvents   
Pharmaceuticals, Ammonia (23%), pharmaceutical Slurries   
Pharmaceuticals, Sylterm   
Pharmaceuticals, Sylterm   
Phenol, ACN, Acrylic acid, Acrylacetate, Dispersions, NaOH, H2O2   
Photographic Chemicals   
Process Development   
R134A, (Fluorinated Hydrocarbons)   
Refrigerant / Blowing Agent  Tank Cars/Trucks 
Rheovis Tank Truck   
Silane, Siloxane, Chloro-Silane, Solvents, Waste Treatment   
Solvents, Paint Resins   
Terypidal Tars   
Transformer Oil, Acrylates, Benzene, Toluene, Xylene, aliphat. Solvents   
Trichloroacetic acid   

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