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  • Electric Spring Return Actuators Meet Fire Standards for Tunnels
    In an emergency situation such a fire inside a tunnel, electric motor operated dampers in the ventilation system can act to clear smoke from the structure as well as to suppress spreading of the fire.
  • PolySlide Ballistic Failure Mode?
    Q: "What can be expected as a resultant failure mode of the PolySlide TM composite cylinder if an internal return spring fails (fractures) during operation?" A: The most popular projectile related failure theories for composite cylinders are those that are simplest to use and applicable to general
  • Bellows smooth valve moves
    electrodeposited nickel bellows connected by a common orifice. With the turbine shut down, the valve-poppet return spring forces damping oil into the first bellows. On start-up, gas pressure on a diaphragm compresses the first bellows and displaces oil into the second. As the turbine runs, oil constantly
  • Permanent Set
    Simply put, permanent set in a compression spring is a condition where the spring is deflected (compressed) and does not return to its original free length. This occurs when the material is deflected beyond its elastic properties. The amount of material in the spring is insufficient to carry
  • Slotted Pin Inflexibility Leads to Failure
    A "Spring Pin" is appropriately named by its ability to flex into a hole that is smaller than the pin's original (pre-installed) outside diameter. A Spring Pin's tendency to return to its original shape after installation makes the pin self retaining. Retention is established by friction between
  • Door Jamb Switch
    Door Jamb Switch with Boot Can be used in a variety of momentary applications where a small switch is required. Black rubber boot covers and protects the face of the switch. SPST Normally closed: Off with plunger depressed, spring return to On. 4A at 12V DC lamp load. Two brass terminals.
  • Bettis Downloads
    including double-acting and spring-return scotch-yoke, rack and pinion, helical-spline and rotary vane.
  • Characterizing a rapid thermal annealing process to improve sensor yield
    between the plates. Frequently, the movement of the sensing elements is modeled as a spring and dashpot mechanism: that is, there is a resistance to displacement from an applied force (spring) and a resistance to the return from that displacement (dashpot). The primary parameter for the resistance

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