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Needle Valves Series - BS31
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Seal Excel General Information

Needle ValvesFeatures
» Available in SS316 conforms to NACE MRO1-75
» Bar stock Body in Straight Patterns
» Panel Mountable
» Variety of end configurations includes SEALEXCEL® Well-Lok Tube Fittings, Male / Female NPT, BSPT, BSPP pipe connections
» Hardened Stem Tip
» Flow coefficients (Cv) from 0.35 to 8.6
» Orifice size : 0.156" (4mm), 0.250" (6.4mm) and 0.437" (11mm)
» Every valve is factory tested.


Needle Valves

Description Features and Benefits
1. Anti Blow-out extended i) Rolled and plated stem threads for excellent Stem performance & extended Stem 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 Harderned Stem Tip for Excellent 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

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

Applications
» General Plant Service
» Instrument Isolations
» Hydraulic and Pneumatic
» Pressuring measurement devices
» Venting

Stem Type
SEALEXCEL® Needle 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 valve life.
V-STEM (VS) : It is used for general purpose liquid and gases.
REGULATING STEM (RS) : It is used where some degree of flow control required.

Needle Valves
Material of Constructions
No. Component Material
1 Bar Handle SS316
2 Set Screw SS316
3 Stem SS316
4 Stem Tip Hardened SS316
5 Packing Bolt SS316
6 Bonnet SS316
7 Lock Nut SS316
8 Panel Nut SS316
9 Packing PTFE
10 Back-up Ring GFT
11 Washer SS316
12 Bonnet Safety Pin SS316
13 Valve Body SS316

Technical Data
The Temperature and Pressure rating for a standard valve with PTFE packing
Temperature Pressure
psig bar
-50°C to 38°C 10,000 680
-50°C to 90°C 9290 632
-50°C to 145°C 8390 570
-50°C to 200°C 7705 524
-50°C to 230°C 7435 505

Testing
Standard Test : Each valve is factory tested with nitrogen at 1000 psig (69 bar) for leakage at the seat and packing, the maximum allowable leak rate of 0.1 sccm
Optional Hydrostatic Test : This test is performed with de-ionised water at 1.5 times the working pressure

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