DAWSONS-TECH most cost effective Bleeder Screw Gauge Valve Series : NVD41 is having compact and rugged Bar Stock Square Body equipped with a Bleed Screw and Swivel Nut design and construction. This Valve is most suitable for a variety of applications including Instrumentation, Hydraulic and Pneumatic systems.
Features / Benefits :
  • Low operating torque, Anti blow-out stem.
  • Stem threads are cold rolled for smooth operation.
  • Choice of optional stem to provide greater flexibility.
  • Choice of packing PTFE or Graphite.
  • Stem packing below the threads, protects the Stem threads from system media.
  • Orifice size : 4.3mm, 6.3mm and 9.5mm, Flow Coefficient (Cv) from 0.37 to 1.8.
  • Available in Material SS316, all wetted parts in accordance with NACE MR01-75.
  • Every Valve is pressure tested.
Product Range & Operating Parameters :
  • Pressure Rating : UPTO 6000 PSIG (413 Bar) at CWP.
  • Temperature Rating :
    • : -54° C to 232° C with PTFE Packing.
    • : -96° C to 426° C with Graphite Packing.
  • End Connections -
    • Fractional : 1/4" to 1" Tube OD.
    • Metric : 6mm to 16mm Tube OD.
    • Pipe Threads : 1/4" to 3/4" Male / Female NPT, BSPT, BSP & Socket Weld
Applications :
  • General Plant Services
  • Hydraulic & Pneumatic
  • Instrumentation Isolation,
  • Pressure Measurement Devices
Stem Type :
 DAWSONS-TECH Valves are available with choice of optional stem to provide greater flexibility.

Non-Rotating (NR)  : It is standard self-centering non-rotating stem tip typically used in high cycle application to extend the Valves life.
‘V’ Stem (VS)  : It is used for general purpose liquid and gases.
Soft Seat (SF) : A soft seat stem requires a lower sealing torque. It is replaceable and suitable for temperature UPTO 120o C.
Regulating Stem (RS)  : It is used where some degree of flow control required.
 
Technical Data :
 The temperature and pressure rating for a standard Valve with PTFE packing.

TemperaturePressure
PSIGBar
-54oC to 38oC6000413
-54oC to 93oC5160351
-54oC to 148oC4660317
-54oC to 204oC4280291
-54oC to 232oC4130289
Type Test Approvals :
 The design of DAWSONS-TECH Bleeder Screw Gauge Valves Series : NVD31 have been tested to Hydrostatic Proof & Burst Test in accordance to MSS SP-99-2016a Clause 5.5 & 5.6.

Testing :
  • Standard Test - Each Valve is pressure tested with Nitrogen at 2000 PSIG (138 Bar) for leakage at the seat and packing.
  • Optional Hydrostatic Test - This Test is performed with De-ionized water at 1.5 times the working pressure.
    •  
    Certification :
     The Certificate to 3.1 acc. to EN10204 for Valves body material and pressure test will be provided on request.
    Material of Constructions :
    Sr. No.Part DescriptionMaterial
    1HandleSS316
    2ScrewSS316
    3Valve StemSS316
    4Dust CapPVC
    5Packing Adjustment ScrewSS316
    6Lock NutSS316
    7BonnetSS316
    8WasherSS316
    9PackingPTFE / Graphite
    10Safety PinSS316
    11Valve BodySS316
    12Swivel NutSS316
    13Drain PlugSS316
    Standard Configuration Dimensions :
    End Connection - AFlow DataDimensions in mmDawsons-TechPart No.
    Orifice(mm)CvBEFA/F1A/F2
    1/4" BSP (Male x Swivel Nut)3.20.2580.079.054.025.4019.0NVD41-MF4G
    1/2" BSP (Male x Swivel Nut)4.30.37100.084.058.031.7527.0NVD41-MF8G
    M20 x 1.5 (Male x Swivel Nut)4.30.37100.084.058.031.7527.0NVD41-MF20M
    1/2" BSP x M22 x 1.5 (Male x Swivel Nut)4.30.37100.084.058.031.7527.0NVD41-M8G-22M
     Dimensions are for reference only and are subject to change.
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