A needle valve is used to accurately control flow rates of clean gasses or fluids. The adjustments are gradual and smooth for controlling the flow rate, however, they can also be used as a reliable shut-off valve. However, they are generally only used for low flow rates and have a relatively large pressure drop from the inlet to the outlet.
SK manufactures a complete line of precision needle valves. Before making your valve selection, be sure to consider the system pressure, operating temperature, required flow and materials of construction.
♦ Bonnet: back seated blow out proof.
♦ Spindle: ground and thread rolled. Packing below thread.
♦ Spindle Tip: non-rotating tip shut-off type & soft seated.
♦ Dust cap: dust cap protects stem threads from external contamination heat code traceability.
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Size: 1/4" & 1/2" & 3/4" |
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End Connection: NPT, BSPT, BSP & Socket Weld. |
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Working Pressure: 6000 psi (413 bar) |
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Temperature Rating: PTFE 450° f(232°c) Grafoil 700° f (371°c") |
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Optional sour gas service valves are available confirming to nace mr-01-75 |
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Stem Packing: PTFE, Grafoil. |
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All valves are 100% factory tested prior to shipment. |
♦ Pneumatic seat test is performed at 1/4 of working pressure. Hydrostatic shell test is performed at 1.5 times the working pressure optional test are available upon request.
♦ Molybdenum disulphide (mo s2)
Needle Valve are available in MOC 316 stainless steel as a standard. Needle Valve can also be manufactured in Brass, SS 316L, Monel and other exotic alloys upon request. Raw material outsourced meets requirements of one or more following ASTM specifications.
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Material |
Bar Stock |
Forging |
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Stainless Steel |
ASTM A 276 / A479 SS316 |
ASTM A 182 SS316 |
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DIN 4401 |
DIN 4401 |
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BS970316-S31 |
BS970316-S31 |
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Brass |
ASTM B16 Alloy 360 |
ASTM B 124 Alloy 377 |
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CA-360 |
CA-377 |
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CA-345 |
CA-345 |
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ASTM B 453 Alloy 345 |
BS 2872 CZ 122 |
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Alloy 400 (Monel) |
ASTM B 164 / ASME SB 164 |
ASTM B 564 / ASME SB 564 |
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Alloy 825 (Inconel) |
ASTM B 425 |
ASTM B 564 / ASME SB 564 |
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Alloy C-276 (Hastelloy) |
ASTM B 574 |
ASTM B 564 |
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SAF 2507 (Super Duplex) |
ASTM A 479 |
ASTM A 182 |
Specifications/standards given in the following table are followed for threaded end of the tube fittings.
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End Connection Type |
Reference Specifications |
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NPT |
ASME B1.20.1, SAE AS71051 |
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ISO/BSP Parallel |
ISO 228 |
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Flanges |
ASME 16.5 |
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ISO/BSP Tapered |
ISO 7, BS EN 10226-1 |
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SAE (Unified) |
ASME B1.1 |
♦ Always use thread sealants on pipe threads. Do not apply sealant / PTFE on tube end of fitting.
♦ Always use O-rings / Gaskets with parallel threads.
All the Needle Valve manufactured by us are ultrasonically cleaned and free from oil and other impurities.
