Check Valves

Check Valves (Non-Return Valves) Series : VC51

DAWSONS-TECH Check Valve Series : VC51 is a very compact, robust and heavy duty design and unidirectional flow control of fluids and gases for high pressure (UPTO 6000 PSIG) Instrumentation system. It is used in various applications where high integrity leak rates and re-sealing capabilities are desired.

Features :
  • Back stopped poppet design to minimum spring stress.
  • ‘O’ Ring bonded poppet seat provides leak tight seal.
  • Provides large flow, minimum of chatter and fluctuation.
  • Variable cracking pressure: 1/3, 1.5, 10, 25 and 100 PSIG.
  • Suitable for Vacuum and high-pressure applications.
  • Available in Material SS316L.
  • Every valve is pressure tested.

Operating Parameters :
  • Pressure Rating: UPTO 6000 PSIG (408 Bar) at CWP
  • Temperature Rating: UPTO 198o C with Viton ‘O’ Ring
  • End Connections:
    • Inch: 1/4" to 1” Tube OD
    • Metric: 6mm to 25mm Tube OD
    • Pipe Thread: 1/4" to 1” Male / Female BSP / BSPT / NPT
    • Face Seal: 1/4" to 1”
    • ‘O’ Ring Face Seal: 1/4" to 1”
Applications :
  • Gas, Liquid, Fluid Handling.
Material of Construction :
Sr. No. Description Material
1 Inlet Body SS316
2 Bonded Popet SS316
3 Pusher SS316
4 ‘O’ Ring Viton
5 Backup Ring PTFE
6 Spring SS302
7 Outlet Body SS316
TEMPERATURE & PRESSURE RATING
Material Size SS316L
1/8” to 1/2" 6mm to 12mm 3/4" & 1” 22mm & 25mm
Temperature Fo (Co) Working Pressure, PSIG (Bar)
-10 (-23) to 100 (37) 6000 (413) 5000 (344)
200 (93) 5160 (355) 4290 (296)
250 (121) 4910 (338) 4080 (281)
300 (148) 4660 (321) 3875 (267)
400 (204) 4280 (295) 3560 (245)

CRACKING AND RESEAL PRESSURE
Cracking Pressure* Cracking Pressure Range Reseal Pressure**
PSIG (Bar) PSIG (Bar) PSIG (Bar)
1/3 (0.02) UPTO 3 (0.2) UPTO 6 (0.4) Back Pressure
1 (0.06) UPTO 4 (0.27) UPTO 4 (0.27) Back Pressure
5 (0.34) 3 to 9 (0.20 to 0.62) UPTO 2 (0.13) Back Pressure
10 (0.68) 7 to 15 (0.48 to 1.0) 3 (0.2) or more Inlet Pressure
25 (1.7) 20 to 30 (1.3 to 2.0) 17 (1.1) or more Inlet Pressure
* CRACKING PRESSURE
  • The differential pressure between the inlet and outlet, at which an initial flow is passing through the Valve.
    ** RESEAL PRESSURE
    • The differential pressure between the outlet and inlet, at which no flow is passing through the Valve.

      TECHNICAL DATA
      Connection Sizes Cracking Pressure PSIG (Bar) Max. Flow Coefficient (Cv) Back Pressure at 70oF (20oC) PSIG (Bar)
      1/8, 1/4, 6mm 1/3 (0.02), 1 (0.06), 5 (0.34), 10 (0.68) & 25 (7.1) 0.67 6000 (408)
      3/8, 1/2, 8mm - 12mm 1.80 6000 (408)
      3/4, 1, 22mm, 25mm 4.7 5000 (344)
      End Connection Dimensions in mm A/F Pressure Rating PSIG (Bar) Dawsons-Tech Part No.
      Type Size A B
      Metal Gasket Face Seal 1/4 58.0 26.4 11/16 6000 (413) VC51-GFS4
      1/2 69.2 31.2 1 3500 (241) VC51-GFS8
      3/4 76.1 45.4 1-5/8 3000 (206) VC51-GFS12
      ‘O' Ring Face Seal 1/4 50.4 26.4 11/16 6000 (413) VC51-ORF4
      1/2 59.8 31.2 1 6000 (413) VC51-ORF8
      3/4 73.6 45.4 1-5/8 5000 (344) VC51-ORF12
      1 73.6 45.4 1-5/8 5000 (344) VC51-ORF16
      Male NPT 1/4 55.0 26.4 11/16 6000 (413) VC51-MM4N
      3/8 60.0 31.2 1 6000 (413) VC51-MM6N
      1/2 69.2 31.2 1 6000 (413) VC51-MM8N
      3/4 83.5 45.4 1-5/8 5000 (344) VC51-MM12N
      1 93.3 45.7 1-5/8 5000 (344) VC51-MM16N
      Female NPT 1/4 54.1 26.4 11/16 6000 (413) VC51-FF4N
      3/8 64.8 31.2 1 5000 (344) VC51-FF6N
      1/2 83.6 31.2 1-1/16 4600 (316) VC51-FF8N
      3/4 90.1 45.4 1-5/8 4300 (296) VC51-FF12N
      1 97.3 45.4 1-5/8 4100 (282) VC51-FF16N
      Fractional Tube Fitting 1/4 61.8 26.4 11/16 6000 (413) VC51-TT4
      3/8 70.0 31.2 1 6000 (413) VC51-TT6
      1/2 75.3 31.5 1 6000 (413) VC51-TT8
      3/4 89.5 31.5 1-5/8 5000 (344) VC51-TT12
      1 98.5 45.4 1-5/8 4700 (323) VC51-TT16
      Metric Tube Fitting 6 mm 61.8 45.4 11/16 6000 (413) VC51-TT6M
      8 mm 68.5 26.4 1 6000 (413) VC51-TT8M
      10 mm 71.1 31.2 1 6000 (413) VC51-TT10M
      12 mm 75.3 45.4 1 6000 (413) VC51-TT12M
      22 mm 88.5 26.4 1-5/8 5000 (344) VC51-TT22M
      25 mm 98.5 31.2 1-5/8 4700 (323) VC51-TT25M
        Dimensions are for reference only and are subject to change.