Control Valves

  2. Valve
  3. Control Valves

Control Valves modulate the fluid flow in a piping system. All the valves listed above can be used for manual flow control with certain limitations. Reciprocating and rotary globe control valves with pneumatic diaphragm actuators are recommended for automatic process control where precise (<1% inaccuracy) automatic flow control is required. V-Notch Ball Valves and High Performance Butterfly Valves are available, which under acceptable process conditions perform very well (typically 2-3% inaccuracy) in automatic control loops. Diaphragm valves, surprisingly enough, have excellent throttling characteristics and should be considered for sanitary type applications. Proportional Solenoid Valves are an economical way to modulate flow in small sizes up to 1" In order to automate a valve, it must be able to accept an actuator and control signal.

  • Proportional solenoid control valves
    are very economical solutions for general purpose applications. Variable flow is achieved by positioning the armature proportionally to a control signal. Internally, high frequency pulse-width modulation of the coil provides excellent near linear control characteristics. These miniature control valves are typically available in sizes from 1/4" up to 1".

  • Reciprocating globe valves
    are the most rugged, and usually the most expensive, particularly in the larger sizes. The torturous path through this type of valve, provides excellent energy conversion of the process fluid resulting in accurate, repeatable control. Severe service noise and cavitation control trims are available in this valve style.

  • Rotary Globe Valves
    consist of cammed plug and segmented "V" ball designs. They have similar control characteristics to reciprocating globe valves with the benefit of low friction from rotary motion. Rotary valves inherently have significantly more capacity and turndown (rangeability) than reciprocating globe valves. Their low cost and comparable installed accuracy performance make rotary globe valves preferred in general service applications.

  • Vee-Port Ball Valves
    consist of a Vee Ported ball design and are available with 30, 60, and 90 degree characteristics. V-Port Ball Valves are ideal in sizes up to 4" for general flow control applications where economy, simplicity, and the sealing features of a quarter-turn ball valve are of value. Pre packaged systems are available complete with pneumatic and electric modulating actuators and positioners.

  • High-Performance Butterfly Valves (HPBV)
    consist of Double and Triple Offset Discs which provide a modified parabolic characteristic. HPBV's are ideal in sizes greater than 3" for general flow control applications where economy, simplicity, and the sealing features of a quarter-turn butterfly valve are of value. Pre packaged systems are available complete with pneumatic and electric modulating actuators and positioners.

Types of control valve bodies

The different types of control valve bodies may be categorized as shown below;

  • Angle Valves
    • Cage-style Valve bodies
    • DiskStack style Valve bodies
  • Angle seat piston valves
  • Globe Valves
    • Single-Port Valve Bodies
    • Balanced-Plug Cage-Style Valve Bodies
    • High Capacity, Cage-Guided Valve Bodies
    • Port-Guided Single-Port Valve Bodies
    • Double-Ported Valve Bodies
    • Three-Way Valve Bodies
  • Rotary Valves
    • Butterfly Valve Bodies
    • V-Notch Ball Control Valve Bodies
    • Eccentric-Disk Control Valve Bodies
    • Eccentric-Plug Control Valve Bodies