Screwed Bonnet Needle Valves
PVI screwed bonnet needle valves are designed for flow regulation and provide leak-free shut-off in systems up to 10,000 psi. Available in stainless steel, brass and carbon steel, these valves have a variety of handle and packing options available. The screwed bonnet valve is designed with the stem packing below the threads (non-wetted threads), so the media will not come in contact with the stem threads.
Integral Bonnet Needle Valves
PVI integral bonnet needle valves are designed for flow regulation and provide leak-free shut-off in instrument air lines, instrumentation panels, test stands and analytical systems. Our needle valves are slow opening to prevent water hammer in systems where sensitive instruments are installed. Rated to 6,000 psi, integral bonnet needle valves are a compact, safe and effective way to regulate flow.
NEEDLE VALVES are manufactured in:
- DESIGN : Screwed Bonnet / Integral (Union) Bonnet.
- SPINDLE : Non–Rotating Tip - “Vee” Type & Ball Type (Tungsten Carbide)
Rotating Tip - “Vee” type only. - SEAT : Metal to Metal, Stellited, Teflon
- PACKING : Standard - PTFE. Optional - GRAPHOIL, PEEK, CFT etc.
- SIZE : 1/8” to 1”
- PATTERNS : Straight / Angle
- PRESSURE RATING : PTFE – 6,000 PSI & High Pressure up to 10,000 PSI. GRAPHITE – 4,500 Psi.
- END CONNECTIONS : NPT, BSPT, BSPP, Butt Weld, Socket Weld, Compression Fittings.
- HANDLE : Standard- CS Plated / SS Bar Type
- M.O.C : Body-ASTM A182 F 316(L), 304(L) etc. All other spares in ASTM A 479/A276 Gr. 316(L), 304(L).
- OTHER M.O.C’s : Titanium, Monel, Hastelloy C., Inconel, 6mo etc.
- Products can be supplied to conform to NACE MR 0175.
- TEMPERATURE : PTFE - Max. up to 250 Deg. C
GRAPHITE - Max. up to 648 Deg. C. - ORIFICE DIA. : 3 mm to 9.5 or 10 mm
- TESTING: Standard - Hydro Test, Pneumatic Test, Nitrogen Test
Optional - Vibration, Temperature Cycling, Helium etc.
Special/Optional Key Features :
PVI offers Valves with Non-Rotating Tip Stem (NRT) thereby providing tight, repeatable shutoff without the galling or cross-scoring that occurs on V & ball-type stems. The NRT conical stem tip stops rotating when it contacts the seat so that any further torque turns the stem and not the tip. Furthermore, the conical stem tip seats in the same place every time - the more often the valve is seated, the better the mating with the seat is achieved. By contrast, the ‘V’ & ball-type tip does not seat in the same place every time, as the tip has no consistent axis of rotation. Consequently, every time the valve seats, a new seat mark is scored on the tip, creating multiple potential leak paths.