Needle Valve

Needle valves are used in instrumentation systems and work on an identical principle to screwed stem globe valves. The difference being that instead of a plug point, a needle valve has, as you would expect, a needle point. Operation is generally by a t-bar, rotated to push the needle into the seat. The seat to seal interface is the needle passing through and sealing on a conical area machined inside the body (or on a seat insert screwed / swaged into the body). Energisation of the seal is by the mechanical force applied through the stem.

The primary function of a needle valve is isolation. The secondary function could be throttling (although not recommended as this can result in erosion of the sealing surface) and the third function is reduction, where the seat aperture in the needle valve is a smaller bore than the piping bore.
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Needle Valve Specification

Click for more Needle Valves - General Design Criteria  
  • Manual Hand Lever Operated
  • Operating temperature and fluids suitability - further information on request
  • Firesafe / Cryogenic / Gas Service certified options
  • Modification service available for all stock options
Click for more Standard Pressure Class Ratings / End Connections
  • ANSI 800, 1500 & 2500lb - Threaded, Socket Weld and Butt-Weld ends
  • PN, API and other Pressure Class Valves available on request

Common Materials of Construction Material Specifications
Standard Carbon Steel ASTM A105
A216 WCB
WCC
Low temperature Carbon Steel ASTM LF2
A352 LCC
LCB
Stainless Steel ASTM A182 F316
ASTM A182 F316L
ASTM A182 F304
ASTM A182 F304L
ASTM A182 F321
ASTM A182 F347
ASTM A351 CF8M
ASTM A351 CF3M
Specials F44
SMO
F51
Duplex
Super Duplex
Monel
Hastelloy
Titanium
Inconel
Bronze
Alu. Bronze
Other Actuated
Needle Valve