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  • Sizing Valves for Water & Steam
    differential available between supply and return mains with design flow at the valve location). As "available pressure" is often difficult to calculate, normal procedure will be to select the valve using a pressure drop at least equal to the drop in the coil or other load being controlled (except where
  • Control Valve Solutions for Critical Power Applications
    The valve was designed to supply 750#/hour with one set of jets in service, and 1500#/hour with two sets of jets in service. The original sizing of the orifice was ¼", however evaluation of the flow characteristics showed that the flow with two jets in service was reaching >90% of the valve opening
  • Traditional solenoid valves are simple to install but may not be the right solution for long term reliability or high flow applications
    Replacing a solenoid valve with a DynaMatic electric ball valve...Why and how?. Solenoid valves are typically easy to install and are used in applications utilizing pressure, flow, temperature and level switches. They can also be controlled by PLC units that only output a single control signal
  • 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
  • Designing & Commissioning Variable Flow Hydronic Systems (.pdf)
    Direct return Variable Flow Hydronic Systems (VFHS) must be designed to be self-balancing. However, in practice many design engineers will use customary pipe sizing routines, piping detail drawings, and specifications that apply to more familiar constant flow systems. Substituting a 2-way valve
  • Part 2-Flow Energy Management Applications-Installation Tips & Tricks
    installation question is: How much upstream and downstream straight run is required, and what happens if you use less straight run?. Because valves, elbows, control valves, and other piping components may cause flow disturbances, you want to select an installation site that will minimize possible
  • Measurement and Control Basics, Fourth Edition
    of. fluid flow has been expanded and improved in Chapter 9. A discussion on. types of control valves and control valve actuators was added to. Chapter 10 and the section on control valve sizing was expanded and. improved. All of the chapters have been supplemented with new or improved example
  • Handling Pressure Variation With a Mass Flow Controller
    Pressures in the reactor vessel can range from a few hundred PSIG to several thousand PSIG. Since an MFC is a closed loop control system with a valve that is sized for a specific set of conditions for optimum performance, pressure variations can significantly impact the performance of the valve.
  • Bring on the Butterfly (.pdf)
    Zone valves. Ball valves. Globe valves. Butterfly valves. These are the control valves used in HVAC today. Whereas zone, ball, and globe valves are used in small valve applications, butterfly valves are often used when water applications call for valves larger than 2' (3.1 cm) or when the flow

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