Info Piston Rings

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• Piston/diaphragm pressure switches
  The pressure switches normally used to turn shop air compressors on and off today typically employ a sensing element that consists of a plunger or piston working against a compression spring. The surface area of the plunger and the degree of spring compression determine the amount of pressure...
• Handbook guides O-ring design
  if the temperature is above 100 F. O-ring seals are not recommended, therefore, for speeds less than one fpm when pressure differentials are below 400 psi. If system pressure slowly diminishes, as through slow valve leaks, and a sealed piston moves slowly through a cylinder, spiral failure is likely...
• Accurately Predicting O-Ring Swell
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• Polymers enhance race-car performance
  piston, O-ring groove, and bearing groove. Top right: New Arlon damper piston with ACT and Ener-Cap seals. In racing, a split second can make the difference between winning and losing, or between a serious accident and a trouble-free ride. That's why race teams in CART, Formula 1, Indy Car, and NASCAR...
• Rotary Actuators
  , the outer spline engages the ring gear and causes sleeve rotation. At the same time, the inner spline engages another set of helical teeth on the output shaft. This causes relative shaft rotation in addition to that of the piston sleeve. increase helix angle and reduce actuator length by replacing...
• Selection Factors for Seals
  , or piston rings can be used, but these seals are considered specials. Lubrication can reduce heat generation at the seal interface, but care must be taken to prevent coking. Direct cooling with a cooling chamber and heat exchanger can help control thermal problems. In this method, an integral pumping ring...
• Hydraulic Speed Control
  are linear-acting devices that precisely regulate displacement versus time. Specifically, a load applied to the HSC's piston rod is maintained at a constant speed throughout the entire compression stroke. HSCs, like shock absorbers, transform kinetic energy into heat by means of hydraulic orificing...
• Fluid Motors
  , the shaft is driven through a differential-gear arrangement that permits low speed and high torque. Axial-piston motors have a reputation for high volumetric efficiency, combined with excellent operation at both high and low speeds. In hydraulic designs, axial-piston motors produce maximum torques...
• Bellows smooth valve moves
  first looked at a dashpot and sliding-piston arrangement for the damping job. But piston O-rings introduce unpredictable friction and hysteresis that equates to jerky poppet action and erratic fuel flow. Gas-filled dampers were also considered. But they suffer compressibility effects that diminish...
• Accumulators
  : gas loaded, spring loaded, or weight loaded. The latter are typically very large devices, with concrete disks loaded onto an oversized piston. Often found in older, high-demand applications such as steel mills, weight-loaded accumulators have a large capacity and uniform output pressure but present...

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