Needle Valves : Series - BS31


FEATURES

  • Available in SS316, all wetted par ts in accordance with NACE MR01-75
  • Heat Code Traceable to certified material test report
  • Bar Stock Body Straight patterns, Panel mountable
  • Thread for greater strength and smoother operation
  • Prevents lubricant washout
  • Variety of end configurations includes SEALEXCEL® Well-Lok™ Tube Fittings Male/Female NPT, BSPT, BSPP pipe and tube socket weld connections
  • Hardened Stem Tip
  • Flow coefficients (Cv) from 0.35 to 0.86
  • Orifice size : 0.156" (4mm) and 0.250" (6.4mm)
  • Every valve is factory tested.
Needle Valves : Series – BS31
No. Description Features and Benefits
1. Anti Blow-out Stem i) Rolled and plated stem threads for excellent performance & extended service life. II) Non Rotating self centering stem tip for superior &repeatable perfect sealing. III) Burnished stem at packing area to ensure low torque operation of the valve & reduction in packing wear.
2. Stem Tip Hardened Stem Tip for Excellence performance and Extended service life.
3. Packing Bolt Allows packing adjustment in open or close position.
  4.   Packing   Packing below the threads protects the flow stream from lubricant contamination on the threads or wash out and also protect the stem threads from potential damaging effects of the media.
5. Locking Pin To prevent accidental loosening / disassembly of valve.
6. Bonnet Lock Nut For safety to prevent accidental loosening of packing bolt
Needle Valves : Series – BS31

OPERATING PARAMETERS

  • Pressure Rating : Upto 10,000 psig (680 bar) at CWP
  • Temperature Rating :
    • -54ºC to 232ºC with standard PTFE packing
    • upto 426ºC with optional Graphite packing

APPLICATION

  • General Plant Service
  • Instrument Isolation
  • Hydraulic and Pneumatic
  • Pressure measurement devices
  • Venting

STEM TYPE

SEALEXCEL Needle Valves are available with a choice of the optional stem to provide greater flexibility.

  • NON-ROTATING (NR): It is Standard self-centring non-rotating stem tip typically used in high cycle application to extend the valve life.
  • V-STEM (VS): It is used for general purpose liquid and gases.
  • SOFT SEAT (SS): A soft seat stem requires a lower sealing torque, It is replaceable and suitable for temperature upto 120ºC
  • REGULATING STEM (RS) : It is used where some degree of flow control required.

    • MATERIAL OF CONSTRUCTIONS

    Sr.NNoo. . Part Description Material
    1. Bar Handle SS316
    2. Set Screw SS316
    3. Stem SS316
    4. Stem Tip Hardened - 17-4PH
    5. Packing Bolt SS316
    6. Lower Bonnet SS316
    7. Lock Nut SS316
    8. Panel Nut SS316
    9. Packing PTFE/Graphite
    10. Back-up Ring GFT
    11. Washer SS316
    12. Bonnet Lock Pin SS316
    13. Valve Body SS316
    Needle Valves : Series – BS31

    TECHNICAL DATA

    The Temperature and Pressure rating for a standard valve with PTFE packing
      Temperature Pressure
    psig bar
    -50ºC to 38ºC 10,000 680
    -50ºC to 90ºC 9290 632
    -50ºC to 145ºC 8390 570
    -50ºC to 200ºC 7705 524
    -50OC to 230ºC 7435 505
    TESTING
    • Standard Test: Each Valve is factory tested with nitrogen at 1000 psig(69 bar) for leakage at the seat, the maximum allowable leak rate of 0.1 sccm
    • Optional Hydrostatic test : This test is performed with de-ionised water at 1.5 time the working pressure.
    Needle Valves : Series – BS31

    STANDARD CONFIGURATION DIMENSIONS

    End Connections     Orifice     Cv Dimensions (mm)   Ordering Number
      Inlet   Outlet A B E F G H (Open) J
    1/8" Female NPT 1/8" Female NPT 4.0 0.35 57.2 28.6 12.7 52.5 19.8 82.8 - BS31-FF2N
    1/4" Female NPT 1/4" Female NPT 4.0 0.35 57.2 28.6 14.3 52.5 19.8 82.8 - BS31-FF4N
    1/2" Female NPT 1/2" Female NPT 6.4 0.86 79.4 39.7 19.0 69.9 26.2 107.0 - BS31-FF8N
    1/4" Male NPT 1/4" Male NPT 4.0 0.35 57.2 28.6 12.7 63.5 19.8 82.8 - BS31-MM4N
    1/2"Male NPT 1/2"Male NPT 6.4 0.86 79.4 39.7 15.8 63.5 26.2 82.8 - BS31-MM8N
    14" Well-Lok 14" Well-Lok 4.0 0.35 71.6 35.8 12.7 52.5 19.8 82.8 - BS31-TT4
    1/4" TSW 1/4" TSW 4.0 0.35 57.2 28.6 12.7 52.5 19.8 82.8 7.20 BS31-TSW4
    1/4" Male NPT 1/4" Female NPT 4.0 0.35 57.2 28.6 12.5 63.5 19.8 82.8 - BS31-MF4N
    1/2" Male NPT 1/2" Female NPT 6.4 0.86 79.4 39.7 19.0 69.9 26.2 107.0 - BS31-MF8N

    Dimensions shown with SEALEXCEL® Well-Lok™ Nut are finger tight

    Dimensions are for reference only and are subject to change.

    General Information Ordering Information Enquiry Catalogue