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DQSV Check Valve
DQSV · Backflow prevention

Check Valve

Prevent backflow. Operate automatically.

A check valve opens and closes automatically in response to the pressure difference created by the medium. Forward flow opens the disc; when flow falls or a reverse pressure difference develops, gravity, a spring where fitted, and reverse pressure close it. This helps prevent backflow and protect pumps, compressors and connected equipment.

  • Flow actuated
  • Backflow prevention
  • No external drive
SIZE RANGEDN15 ~ DN400
PRESSURE RATINGPN10 / PN16 / PN25 / PN40
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Confirm the selected configuration and operating limits with DQSV before ordering.

Check Valve specifications
Size RangeDN15 ~ DN400
Pressure RatingPN10 / PN16 / PN25 / PN40
Working Temperature-20°C ~ 120°C(EPDM) / -20°C ~ 200°C(PTFE)
Body MaterialWCB / WCC / CF8 / CF8M etc.
Lining Material (Optional)rubber alloy / ceramic / rubber / polyurethane
Connectionflanged(GB / HG / ANSI / JIS)
Applicable Mediumwater, oil, oil and gas, steam, corrosive media, slurry and other highly abrasive, highly corrosive media
Actuationautomatic, operated by medium pressure difference; no external drive required

Body and construction

Check Valve — Check valve body with a bolted cover and no handwheel
Check valve body with a bolted cover and no handwheel
Check Valve — Angled view of the check valve body and flange connections
Angled view of the check valve body and flange connections

Automatic operation and options

  1. Automatic operation by medium pressure difference
  2. No handwheel or external actuator required
  3. Slow-closing or damping arrangement — confirm availability for the selected model

Product features

  • Automatic opening and closing

    Forward flow opens the disc; closure follows a reduction or reversal of the pressure difference.

  • Backflow prevention

    The disc closes against reverse flow to limit backward movement of the medium.

  • System protection

    Non-return operation helps protect pumps, compressors and associated pipeline equipment.

  • Responsive operation

    Disc motion depends on flow and pressure conditions, with spring assistance where fitted.

  • Application flexibility

    Review the valve for natural gas transmission, power and metallurgical applications, subject to medium and material compatibility.

  • Maintenance access

    Confirm the selected construction, inspection access and replacement sealing parts for the installation.

Construction features

Automatic mechanism
The disc responds to the medium pressure difference rather than a handwheel or external actuator.
Closure assistance
Gravity, reverse pressure and a spring where fitted support closure; confirm the selected mechanism and installation orientation.
Optional lining and damping
Lining materials and slow-closing or damping arrangements require confirmation for the selected configuration.
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