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.DescriptionMaterial
1Inlet BodySS316
2Bonded PopetSS316
3PusherSS316
4‘O’ RingViton
5Backup RingPTFE
6SpringSS302
7Outlet BodySS316
TEMPERATURE & PRESSURE RATING
Material SizeSS316L
1/8” to 1/2" 6mm to 12mm3/4" & 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 RangeReseal 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 SizesCracking Pressure PSIG (Bar)Max. Flow Coefficient (Cv)Back Pressure at 70oF (20oC) PSIG (Bar)
      1/8, 1/4, 6mm1/3 (0.02), 1 (0.06), 5 (0.34), 10 (0.68) & 25 (7.1)0.676000 (408)
      3/8, 1/2, 8mm - 12mm1.806000 (408)
      3/4, 1, 22mm, 25mm4.75000 (344)
      End ConnectionFlow DataA (mm)A/F (Inch)Dawsons-Tech Part No.
      TypeSizeOrifice (mm)Cv
      Metal Gasket Face Seal1/44.70.7558.011/16VC51-GFS4
      1/27.82.1369.21VC51-GFS8
      3/415.06.076.11-5/8VC51-GFS12
      ‘O' Ring Face Seal1/44.70.7550.411/16VC51-ORF4
      1/27.82.1359.81VC51-ORF8
      3/415.06.073.61-5/8VC51-ORF12
      115.06.073.61-5/8VC51-ORF16
      Male NPT1/44.70.7555.011/16VC51-MM4N
      3/87.82.1360.01VC51-MM6N
      1/27.82.1369.21VC51-MM8N
      3/415.06.083.51-5/8VC51-MM12N
      115.06.093.31-5/8VC51-MM16N
      Female NPT1/44.70.7554.111/16VC51-FF4N
      3/87.82.1364.81VC51-FF6N
      1/27.82.1383.61-1/16VC51-FF8N
      3/415.06.090.11-5/8VC51-FF12N
      115.06.097.31-5/8VC51-FF16N
      Fractional Tube Fitting1/44.70.7561.811/16VC51-TT4
      3/87.82.1370.01VC51-TT6
      1/27.82.1375.31VC51-TT8
      3/415.06.089.51-5/8VC51-TT12
      115.06.098.51-5/8VC51-TT16
      Metric Tube Fitting6 mm4.70.7561.811/16VC51-TT6M
      8 mm6.42.0268.51VC51-TT8M
      10 mm7.82.1371.11VC51-TT10M
      12 mm7.82.1375.31VC51-TT12M
      22 mm15.06.088.51-5/8VC51-TT22M
      25 mm15.06.098.51-5/8VC51-TT25M
        Dimensions are for reference only and are subject to change.