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  • Proportional Valve Could Improve Respirators
    Designers of ventilators, respirators, and blood pressure monitors could benefit from a new proportional pneumatic valve that reportedly offers greater air flow control accuracy. The new valve, introduced by Clippard Instrument Laboratory, Inc. (Cincinnati, OH; and known
  • Proportional Valve Design Meets Control System Challenges
    Clippard Instrument Laboratory, long a pioneer in the miniature pneumatic industry, has achieved a breakthough in proportional valve technology with the introduction of the EVP series proportional valve. Since 1974, Clippard ( has produced the EV series valve, said to combine
  • A Closer Look At Proportional Control
    A new proportional valve positions the solenoid's moving parts outside the core of the coil. This eliminates the need for tightly toleranced parts and prevents the armature from rubbing against the housing. The critical specifications engineers evaluate when selecting high-performance proportional
  • Proportional Valves
    are an inexpensive way to control position, velocity, or force on equipment requiring high-speed response at high flow rates. Many proportional valves are modified versions of four-way, on/off solenoid valves in which proportional solenoids replace conventional solenoids. In operation, solenoid force is balanced
  • Proportional valves eliminate design headaches
    New design produces consistent flow and gain. The EPV proportional valve has standard and manifold mounting options, a variety of orifice sizes and control voltage ranges, and three different electrical connectors. Performance curves for two conventional proportional valves show wide variations
  • Proportional Valves Gives Precise, Variable Flow
    Proportional pneumatic valves can have hysteresis levels as high as 15%, which can wreak havoc on closed-loop control systems. Another problem with proportional valves is that they often vary from one to another in terms of maximum flow and gain. Gain is the rate of flow change to valve input
  • Balancing A Variable Flow Water System Will Ruin the Control System
    Many seminars and technical sessions have been held to outline procedures for balancing variable flow water systems. Most of these sessions recommend "Proportional Balance." When this technique is used, all control valves are set wide open and the circulating pump is operated at maximum speed
  • Is variable speed drive the panacea we're looking for?
    Five types of internal control modes can be considered as suitable. for compressors: Dual, Quadro, Vario, and Proportional. Control, using inlet valve regulation, and Variable Speed Control. of the drive. motor (Fig. 1a). Of these five. modes, Dual,. Quadro and. Variable Speed. have proved

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