Asahi Ball Valves
Asahi Actuated Ball Valves
Asahi Ball Check Valves
Asahi Swing Check Valves
Asahi Butterfly Valves
Asahi Actuated Butterfly Valves
Asahi Diaphragm Valves
Asahi Actuated Diaphragm Valves
Asahi Globe Valves
Asahi Labcock Valves
Asahi Gate Valves
Asahi Constant Flow Valve
Asahi Y-Strainers
Flange and Valve Gaskets

Asahi Constant Flow Valve


Using the constant flow valve provides an accurate way of controlling flow without automation (neither electricity nor an air supply is required). Accurate control is achieved by the globe style body and seat-and-plug configuration. This unique design allows the valve to maintain a constant preset flow, even if the differential pressure changes. The all thermoplastic construction makes it ideal for semiconductor, chemical, swimming pool, and salt water applications.

Features and Benefits

  • Seals in Neoprene, FKM, etc.
  • Also available in flanged DIN (Metric), etc.
  • Body and bonnet are of solid PVC or CPVC
  • All wetted parts are of thermoplastic and elastomeric materials for superior corrosion resistance
  • A preset constant flow rate is maintained by automatically regulating orifice opening area, responding to changes of pressure differentials across the valve - see "Principles of Operation "on the following page
  • Vertical or horizontal installations
  • Flow rate accuracy: plus or minus 6 % of full scale flow rate (water at ambient temperature)
  • Flow rate rangeability: 20 : 1 maximum
  • Hand wheel permits ON/OFF opening and closing
  • Hand wheel serves as a mechanism by which the flow rate setting may be adjusted without shutting down the pipeline
  • Springs of Stainless Steel 304 with ETFE coating tested for long cycle life
  • Prescribed flow setting is clearly visible on the indicator at the top


  • Sizes: PVC: 1/2", 3/4", 1", 2", 3", 4"
    CPVC: 1" and 2"
  • Body: PVC, CPVC (1" and 2")
  • Bonnet: PVC, CPVC (1" and 2")
  • Models: Flanged ANSI
  • Seals: EPDM
  • Springs: Stainless Steel 304 with ETFE Coating


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